Multi-parameter cooperative control system and method for circuit board copper-containing cleaning water recovery

Abstract

The present application relates to a multi-parameter cooperative control system and method for copper-containing cleaning water recovery of a circuit board, used in the field of advanced process control technology, comprising: a concentrated liquid buffer tank arranged between a membrane concentration unit and an electrolytic recovery unit, used for temporarily storing and mixing concentrated liquid output by the membrane concentration unit; a parameter acquisition unit used for acquiring membrane concentration operation parameters, membrane concentration effluent parameters, concentrated liquid buffer state parameters and electrolytic recovery state parameters; a cooperative control unit used for establishing an operation parameter correlation model; the cooperative control unit controls the linkage operation of the membrane concentration unit, the concentrated liquid buffer tank and the electrolytic recovery unit according to the continued concentration state, the adapted effluent state, the electrolysis adapted state and the electrolytic feed liquid allowable state. Based on the above method, the membrane concentration, temporary storage and electrolytic feed liquid cooperative operation can be realized, and the problems of weak matching of feed liquid conditions, high energy consumption and unstable recovery are solved.

Description

Technical Field

[0001] This invention relates to the field of advanced process control technology, and in particular to a multi-parameter collaborative control system and method for the recovery of copper-containing cleaning water from circuit boards. Background Technology

[0002] Printed circuit boards (PCBs) are essential components in electronic products, carrying electronic components and enabling electrical connections. During PCB manufacturing, processes such as copper plating, chemical copper deposition, micro-etching, etching, pickling, stripping, and related washing generate copper-containing cleaning water. This cleaning water typically contains copper ions, acid and alkali components, electrolytes, and small amounts of process additives, and the volume is relatively large. The copper ion concentration, conductivity, and pH level can easily fluctuate depending on the production batch, cleaning intensity, amount of chemicals carried out, and production line operation. If only conventional wastewater treatment methods are used, copper resources are easily dispersed and lost with sludge, residual liquid, or permeate, hindering copper resource recycling.

[0003] Existing copper-containing cleaning water recovery processes for printed circuit boards (PCBs) typically include collection and pretreatment, membrane concentration, and electrolytic recovery. First, suspended solids, particulate matter, and colloidal impurities are removed through sedimentation, filtration, activated carbon adsorption, security filtration, or ultrafiltration. Then, membrane separation units such as nanofiltration or reverse osmosis are used to concentrate the copper-containing cleaning water, enriching copper ions in the concentrate. The concentrate is then sent to an electrolytic recovery unit, where copper ions are deposited at the cathode, achieving copper resource recovery. As PCB manufacturers increasingly demand wastewater resource utilization, high copper recovery rates, and efficient energy consumption control, the coordinated operation and multi-parameter control of the membrane concentration and electrolytic recovery systems are becoming crucial directions for copper-containing cleaning water recovery and treatment.

[0004] In the aforementioned process, the membrane concentration unit typically determines the membrane concentration endpoint based on membrane-side parameters such as membrane pressure difference, operating pressure, permeate flow rate, concentration ratio, or copper ion concentration. The effluent determination primarily revolves around the operating status of the membrane concentration unit itself. However, the membrane concentration endpoint not only affects the energy consumption and membrane operating status of the membrane concentration unit but also directly impacts the copper ion concentration, conductivity, liquid level, and copper load of the concentrate entering subsequent treatment stages. If membrane concentration ends too early, the copper ion concentration in the concentrate and the copper load in the feed solution may be too low, potentially reducing the efficiency of subsequent electrolytic recovery. Conversely, if membrane concentration lasts too long, the membrane pressure difference increases, the permeate flow rate decreases, the energy consumption of the membrane system increases, and the conductivity and pH of the concentrate may deviate from the electrolytic compatibility range. Therefore, the matching between the membrane concentration endpoint and the subsequent electrolytic feed conditions is weak, easily affecting the stability of the electrolytic recovery process and the energy consumption per unit of copper recovery.

[0005] Furthermore, existing solutions typically feed concentrate into the electrolytic recovery unit according to a set copper ion concentration, liquid level, or time, resulting in a relatively fixed supply rhythm and electrolytic feed conditions. Since the electrolytic feed state is affected by the upstream membrane concentration results and the mixing state of the concentrate buffer tank, it directly impacts subsequent electrolysis voltage, electrolysis current, current efficiency, cathode copper deposition state, and residual copper content. When fluctuations occur in the concentrate's copper ion concentration, conductivity, pH level, buffer tank level, electrolytic cell level, or electrolytic cell load, a fixed feed method can easily lead to unstable load in the electrolytic recovery unit, insufficient copper deposition, or excessively high residual copper content. Simultaneously, the electrolytic receiving state of the recovery unit, including electrolytic cell level, electrolysis voltage, electrolysis current, operating load, and operating status, also affects its ability to receive concentrate, resulting in weak connectivity between the membrane concentrate output, concentrate storage, and electrolytic feed, making it difficult to adapt to dynamic changes in copper-containing cleaning water quality and electrolytic operating conditions. Summary of the Invention

[0006] Based on this, the present invention provides a multi-parameter collaborative control system and method for the recovery of copper-containing cleaning water from circuit boards, which can realize the coordinated operation of membrane concentration, temporary storage and electrolytic feeding, and solve the problems of weak matching of feeding conditions, high energy consumption and unstable recovery.

[0007] Firstly, a multi-parameter collaborative control system for the recovery of copper-containing cleaning water from circuit boards is provided. This system includes: a concentrate buffer tank, located between the membrane concentration unit and the electrolytic recovery unit, used to temporarily store and mix the concentrate output from the membrane concentration unit; a parameter acquisition unit, used to acquire membrane concentration operating parameters, membrane concentrate output parameters, concentrate buffer state parameters, and electrolytic recovery state parameters; and a collaborative control unit, used to establish an operating parameter correlation model and output a continued concentration state and an appropriate output state based on the membrane concentration operating parameters and membrane concentrate output parameters, an electrolytic appropriate state based on the copper ion concentration, conductivity, pH value, and available feed volume of the mixed concentrate, and an electrolytic feed allowance state based on the feed copper load, remaining acceptable volume of the electrolytic cell, and the electrolytic recovery state. The collaborative control unit controls the membrane concentration unit, concentrate buffer tank, and electrolytic recovery unit to operate in conjunction with each other based on the continued concentration state, appropriate output state, electrolytic appropriate state, and electrolytic feed allowance state.

[0008] Secondly, a multi-parameter collaborative control method for copper-containing cleaning water recovery from circuit boards is provided. This method includes: temporarily storing and mixing the concentrate output from the membrane concentration unit into a concentrate buffer tank located between the membrane concentration unit and the electrolytic recovery unit; collecting membrane concentration operating parameters, membrane concentrate output parameters, concentrate buffer state parameters, and electrolytic recovery state parameters; establishing an operating parameter correlation model, and outputting a continued concentration state and an appropriate output state based on the membrane concentration operating parameters and membrane concentrate output parameters; outputting an electrolytic appropriate state based on the copper ion concentration, conductivity, pH value, and available feed volume of the concentrate after mixing in the concentrate buffer tank; outputting an electrolytic feed allowable state based on the feed copper load, the remaining acceptable volume of the electrolytic cell, and the electrolytic recovery state; and controlling the membrane concentration unit, concentrate buffer tank, and electrolytic recovery unit to operate in conjunction based on the continued concentration state, appropriate output state, electrolytic appropriate state, and electrolytic feed allowable state.

[0009] The beneficial effects achieved by the provided technical solution include at least the following: (1) By setting up a buffer tank for concentrate between the membrane concentration unit and the electrolysis recovery unit, and by establishing an operational parameter correlation model based on the membrane concentration operation parameters, membrane concentrate output parameters, concentrate buffer state parameters and electrolysis recovery state parameters by the collaborative control unit, the output control of the membrane concentration unit no longer depends solely on membrane side parameters such as membrane pressure difference, operating pressure or permeate flow rate, but further combines the copper ion concentration, conductivity, pH, buffer tank level and subsequent electrolysis receiving conditions to make judgments, thereby improving the matching between the membrane concentration endpoint and the subsequent electrolysis feed conditions, reducing the problem of low copper load feed caused by premature membrane concentration, and also reducing the risk of increased membrane system energy consumption and deterioration of membrane operating status caused by excessive membrane concentration operation.

[0010] (2) The concentrate output from the membrane concentration unit is temporarily stored and mixed through the concentrate buffer tank, and the electrolysis adaptation state is output according to the copper ion concentration, conductivity, pH and available liquid volume of the mixed concentrate. This makes the state of the concentrate before entering the electrolysis recovery unit more stable, which can reduce the impact of the fluctuation of copper-containing cleaning water quality in different batches on the electrolysis liquid conditions, and reduce the problems of unstable electrolysis load, insufficient copper deposition or high copper content in residual liquid caused by fluctuation of concentrate parameters.

[0011] (3) Before the concentrate enters the electrolytic recovery unit, the copper load, the remaining acceptable volume of the electrolytic cell, the electrolytic voltage, the electrolytic current, the electrolytic power supply status, and the operating load output of the electrolytic recovery unit are further combined to make the electrolytic liquid feeding no longer executed according to a fixed liquid level, fixed time, or single copper ion concentration, but according to the state of the concentrate and the receiving status of the electrolytic recovery unit. This improves the stability of the electrolytic recovery process, reduces the risk of increased energy consumption per unit of copper recovery caused by low copper load liquid feeding, and helps to improve the copper resource recovery effect.

[0012] (4) By controlling the liquid level interlock from back to front, when the membrane concentration unit, the concentrate buffer tank or the electrolyzer reaches the corresponding upper limit of the liquid level, the receiving capacity of the electrolyzer is released first, then the receiving capacity of the concentrate buffer tank is released, and finally the water inlet and outlet of the membrane concentration unit are restored. This creates a sequential coordination relationship between the membrane concentration outlet, the concentrate temporary storage and the electrolyzer inlet, reducing mutual blockage caused by liquid level changes in each treatment unit and improving the continuity and safety of the copper-containing cleaning water recovery process.

[0013] (5) Based on the copper recovery rate, residual copper ratio, unit copper recovery energy consumption, full tank status of the concentrate buffer tank, and inlet copper load of consecutive batches, the lower limit of the inlet copper load for the next batch is adjusted accordingly. This ensures that the operational results after electrolytic recovery are not merely statistical data, but are used to adjust subsequent inlet conditions. This allows for raising the inlet copper load requirement when the electrolysis effect deteriorates or the unit copper recovery energy consumption increases, and appropriately lowering the lower limit of the inlet copper load when the buffer tank is continuously full and the electrolysis results meet the requirements. This balances electrolytic recovery efficiency, buffer tank receiving capacity, and the need for continuous system operation, further improving the stability of the copper resource recovery process in copper-containing cleaning water. Attached Figure Description

[0014] Figure 1 This is a block diagram of a multi-parameter collaborative control system for the recovery of copper-containing cleaning water from circuit boards, provided in Embodiment 1 of the present invention. Figure 2 This is a block diagram of the copper inlet load lower limit feedback correction module provided in Embodiment 2 of the present invention; Figure 3 This is a flowchart of a multi-parameter collaborative control method for copper-containing cleaning water recovery of circuit boards provided in Embodiment 3 of the present invention; Figure 4 This is a trade-off diagram of recovery rate versus unit energy consumption provided in Embodiment 1 of the present invention; Figure 5 This is a graph showing the relationship between concentration level and cost according to Embodiment 1 of the present invention; Figure 6 This is a concentration enhancement diagram under the low-energy consumption scheme provided in Embodiment 1 of the present invention; Figure 7 This is a graph showing the change in copper recovery rate in consecutive batches according to Embodiment 2 of the present invention; Figure 8 This is a diagram showing the residual liquid ratio and energy consumption constraints per unit of copper recovery according to Embodiment 2 of the present invention; Figure 9 This is a feedback correction diagram for the lower limit of the copper load for the next batch of liquid injection, provided according to Embodiment 2 of the present invention. Detailed Implementation

[0015] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0016] This invention provides a multi-parameter coordinated control system and method for the recovery of copper-containing cleaning water from circuit boards. It is used to achieve coordinated operation of membrane concentration, temporary storage and electrolytic feeding, and solve the problems of weak matching of feeding conditions, high energy consumption and unstable recovery.

[0017] Example 1: This solution provides a multi-parameter collaborative control system for the recovery of copper-containing cleaning water from circuit boards, applied to the resource recovery process of copper-containing cleaning water in circuit board manufacturing enterprises. The system includes a copper-containing cleaning water collection unit, a pretreatment unit, a membrane concentration unit, a concentrate buffer tank, an electrolytic recovery unit, a parameter acquisition unit, and a collaborative control unit. The copper-containing cleaning water collection unit receives copper-containing cleaning water generated after copper plating, micro-etching, etching, chemical copper plating, pickling, or stripping of circuit boards. The pretreatment unit removes suspended solids and particulate impurities from the copper-containing cleaning water and sends it to the membrane concentration unit. The membrane concentration unit concentrates the copper-containing cleaning water and sends the resulting concentrate to a concentrate buffer tank. The concentrate buffer tank is located between the membrane concentration unit and the electrolytic recovery unit and is used to temporarily store and mix the concentrate output from the membrane concentration unit. The electrolytic recovery unit receives the concentrate and recovers copper through electrolysis. The electrolytic recovery unit includes an electrolytic cell, an electrolytic power supply, a cathode, an anode, a circulation assembly, and a drain valve. The drain valve discharges the electrolyte from the electrolytic cell when the current batch of electrolysis is completed or when the electrolytic cell needs to release its receiving capacity. The internal liquid; the parameter acquisition unit is used to collect membrane pressure difference, operating pressure, permeate flow rate, membrane concentration unit liquid level, concentrate copper ion concentration, concentrate conductivity, concentrate pH, concentrate buffer tank liquid level, electrolytic cell liquid level, electrolysis voltage, electrolysis current, electrolysis power supply fault signal, electrolysis recovery unit operating status, current batch completion status, residual liquid copper ion concentration, residual liquid volume, cathodic electrolysis mass before and after electrolysis, and energy meter readings at the start and end of this batch of electrolysis; the collaborative control unit is used to establish an operating parameter association model based on the above parameters, and call the operating parameter association model to control the membrane concentration unit, concentrate buffer tank, and electrolysis recovery unit to operate in conjunction; among them, the operating parameter association model is used to establish the correspondence between membrane concentration operating parameters, concentrate buffer status, and electrolysis feed conditions.

[0018] like Figure 1The diagram shows a multi-parameter collaborative control system for copper-containing cleaning water recovery from circuit boards. The copper-containing cleaning water is sequentially processed through a copper-containing cleaning water collection unit, a pretreatment unit, and a membrane concentration unit to form a concentrated solution. This concentrated solution enters a buffer tank located between the membrane concentration unit and the electrolytic recovery unit for temporary storage and mixing. When the inlet conditions are met, it enters the electrolytic recovery unit for copper electrolysis. The parameter acquisition unit collects membrane concentration operating parameters, membrane concentration outlet parameters, concentrated solution buffer state parameters, and electrolytic recovery state parameters, and inputs the results into the collaborative control unit. The collaborative control unit establishes an operating parameter correlation model, outputting the continued concentration state, the appropriate outlet state, the electrolytic appropriate state, and the electrolytic inlet allowable state, and uses this information to perform coordinated control of the membrane concentration unit, the concentrated solution buffer tank, and the electrolytic recovery unit.

[0019] The copper-containing cleaning water collection unit receives copper-containing cleaning water generated during the circuit board manufacturing process and sends it to the pretreatment unit. Specifically, the pretreatment unit pretreats the copper-containing cleaning water according to the influent particle size requirements of the membrane concentration unit. Let the maximum allowable particle size for the membrane concentration unit be d. max The pore size of the final stage filter element in the pretreatment unit is d. f d f ≤d max / 2; After the copper-containing cleaning water passes through the pretreatment unit, the parameter acquisition unit collects the turbidity Tu of the pretreatment effluent and the pretreatment filtration pressure difference ΔP. f , where ΔP f The difference between the inlet and outlet pressures of the pretreatment filter element. When T u ≤T umax And ΔP f ≤ΔP fmax When T is reached, the pretreated effluent is determined to meet the conditions for entering the membrane concentration unit, and the copper-containing cleaning water is sent to the membrane concentration unit; when T... u >T umax or ΔP f >ΔP fmax During this period, the pretreatment unit continues filtration or stops supplying water to the membrane concentration unit, and replaces or cleans the pretreatment filter elements. Wherein, d max Take the maximum permissible particle size as specified in the membrane concentration unit feedwater instruction manual or membrane element technical document; if the maximum permissible particle size specified in the membrane concentration unit instruction manual and membrane element technical document are inconsistent, take the smaller value as d. max T umax Through pretreatment effluent commissioning, it was determined that: before system commissioning, the pretreatment unit should continuously treat copper-containing cleaning water, and the turbidity T of the pretreatment effluent should be collected at each stage. uThe change in membrane pressure difference after the influent to the membrane concentration unit is recorded. When no abnormal increase in membrane pressure difference occurs in the membrane concentration unit within a commissioning operation cycle, the corresponding commissioning batch is recorded as a qualified pretreatment batch. The turbidity Tu of the pretreated effluent from all qualified pretreatment batches is sorted from smallest to largest, and the preset high quantile value is taken as T. umax ΔP fmax The smaller value is taken from the rated maximum permissible differential pressure of the pretreatment filter element and the preset high percentile value of the differential pressure of a qualified pretreatment batch. In one specific embodiment, the preset high percentile value is the 90th percentile value.

[0020] During the operation of the membrane concentration unit, the parameter acquisition unit collects the operating parameters of the membrane concentration unit, the concentrate buffer tank and the electrolysis recovery unit, and the collaborative control unit performs calculations on some of the parameters.

[0021] The parameter acquisition unit includes direct acquisition and computational acquisition. Directly acquired parameters include the inlet pressure P of the membrane concentration unit. in Membrane concentration unit outlet pressure P out Operating pressure P of the membrane concentration unit run Water production flow rate Q p Current liquid level H in the membrane concentration unit m The copper ion concentration C of the concentrate output from the membrane concentration unit, the conductivity E of the concentrate, the pH value Y of the concentrate, and the copper ion concentration C of the concentrate after mixing in the concentrate buffer tank. mix The conductivity E of the concentrate after mixing in the concentrate buffer tank mix The pH value Y of the concentrate after mixing in the concentrate buffer tank mix Concentrate buffer tank level H b Electrolytic cell liquid level H e Electrolysis voltage U, electrolysis current I, and electrolysis power supply fault-free signal G. ps Operating status of the electrolytic recovery unit S t Current batch completion status F end The concentration of copper ions in the residual liquid, C r residual liquid volume V r Mass M before cathode electrolysis bef Mass M after cathode electrolysis aft The electricity meter reading (W) at the start of electrolysis for this batch bef And the electricity meter reading W at the end of this batch of electrolysis aft The parameters collected during the calculation include the membrane pressure difference ΔP. m The volume of liquid V in the concentrate buffer tank b0 Volume of liquid V in the electrolytic cell e0 The volume of concentrate buffer tank that can receive liquid is V. a The remaining acceptable volume V of the electrolytic cell e Single batch liquid inlet volume Vb Copper load M in the inlet load Theoretical copper quantity M0, copper recovery quantity M, residual copper quantity in the liquid M r The parameters include copper recovery rate R, residual copper ratio D, energy consumption per unit of copper recovery K, electrolysis power consumption W, and operating load L of the electrolysis recovery unit. Among these, ΔP... m =P in -P out M=M aft -M bef M r =C r ×V r W=W aft -W bef The volume of liquid V in the concentrate buffer tank. b0 and the liquid volume V in the electrolytic cell e0 The level-volume calibration table is obtained through a liquid level-volume calibration table. The table is established according to the following rules: With the corresponding tank empty, clean water or calibration solution is added sequentially according to a preset calibration volume ΔV. After each addition of calibration volume ΔV, the corresponding liquid level value H is read, and the cumulative added volume V is recorded, forming several sets of liquid level-volume data (H, V). When the liquid level value collected during operation is between two adjacent calibration levels, linear interpolation is used to calculate the current liquid volume. For the concentrate buffer tank, the current liquid level H is... b Substituting the values ​​into the concentrated buffer tank level-volume calibration table, we obtain V. b0 For the electrolytic cell, the current liquid level H is set. e Substituting into the electrolytic cell level-volume calibration table, we obtain V e0 Among them, the concentration of copper ions in the residual liquid is C. r The concentration of copper ions is collected online by a copper ion concentration sensor installed on the sampling pipeline of the electrolytic cell circulating liquid, or by the sampling unit collecting liquid samples from the electrolytic cell at preset time intervals and then detecting the concentration.

[0022] Furthermore, the collaborative control unit obtains the lowest extractable liquid level H of the concentrate buffer tank according to the following rules. min , Rated flow rate Q of the inlet pump in Permissible liquid infusion time T in The rated single-batch copper processing capacity (M) of the electrolytic recovery unit e Effective cross-sectional area A of the electrolytic cell e0 Effective electrode area A e and the preset upper limit of copper ion concentration in residual liquid C rmax Using the inner surface of the bottom of the corresponding tank as the zero point, measure the effective submerged liquid level H required to maintain full discharge from the outlet of the concentrate buffer tank. out And measure the minimum liquid level H required for the inlet of the inlet pump to maintain normal liquid intake without air intake. pumpRead or calibrate the maximum permissible measurement error ehb of the concentrate buffer tank level sensor, assuming the anti-vacuum margin is hs, and the minimum extractable liquid level H of the concentrate buffer tank. min According to H min =max(H out H pump ) + ehb + hs calculation. Rated flow rate Q of the inlet pump. in Flow rate calibration is achieved by operating the inlet pump at the control frequency or control opening for single-batch inlet operation. After the flow rate stabilizes, a preset number of calibration tests are performed continuously. The calibration time t is recorded for each calibration test. i and corresponding conveying volume V i Calculate the single flow rate Q i =V i / t i ; Each Q i The average value is used as the calibration flow rate Q. cal and Q in Take the flow rate Q from the inlet pump nameplate. name With the rated flow rate Q cal The smaller value in, i.e., Q in =min(Q) name Q cal Permissible liquid infusion time T in The level is determined based on the current remaining acceptable volume of the electrolyzer. The collaborative control unit determines this based on the current liquid level H of the electrolyzer. e Obtain the current liquid volume V in the electrolytic cell e0 And obtain the upper limit H of the electrolytic cell liquid level. emax The corresponding upper limit volume V emax V emax With V e0 The difference is taken as the remaining acceptable volume V of the electrolyzer. e When Q in >0 and V e When >0, the allowable duration T for a single infusion is in According to T in =min(T) cycle T pump V e / Q in ) calculate; where T cycle T is the allowed operating time of the inlet pump during a single batch inlet control cycle. pump This refers to the allowable continuous operation time of the inlet pump. If Q... in ≤0 or V e If the flow rate is ≤0, the inlet pump flow rate is considered abnormal, and single-batch inlet feeding is prohibited. The rated single-batch copper processing capacity M of the electrolytic recovery unit. e Calculated based on the allowable electrolysis current and the allowable electrolysis time per batch. Specifically, the allowable electrolysis current I... allow =min(Ips J max ×A e M e =η min ×I allow ×T e ×M Cu / (z×F;where I ps J is the rated current of the electrolytic power supply. max For the allowable current density of the electrode, A e T represents the effective area of ​​the electrode. e η is the allowable electrolysis time for a single batch. min To preset the minimum current efficiency, M Cu Let be the molar mass of copper, z be the number of electrons in the reduction reaction of copper ions, and F be the Faraday constant. The effective cross-sectional area A of the electrolytic cell is... e0 Take the cross-sectional area of ​​the liquid level calculation area in the electrolytic cell design drawings; effective electrode area A e Determine the effective contact area between the cathode and the electrolyte. Preset the upper limit C for the residual copper ion concentration. rmax According to C rmax =min(C dis C reuse C process ) calculate; where C dis C represents the upper limit of copper ion concentration permitted for the discharge of residual electrolytic solution or at the inlet of wastewater treatment. reuse C represents the upper limit of the permissible copper ion concentration for residual liquid reuse or reflux treatment. process This is the upper limit of the copper ion concentration set for the residual liquid entering the subsequent treatment unit in this system. If the residual liquid is not discharged, then C is not taken. dis Included in the calculation; if the residual liquid is not reused, then C is not taken. reuse Participate in the calculation.

[0023] Before the system is put into operation, a predetermined number of membrane concentration and commissioning batches are continuously collected. The membrane pressure difference ΔP is recorded for each batch. m Operating pressure P run and water production flow rate Q p When the membrane concentration test batch does not exceed the rated membrane pressure difference and rated operating pressure of the membrane concentration unit, and no equipment protection shutdown or abnormal drop in permeate flow occurs, the batch is recorded as a qualified membrane concentration batch. If the number of qualified membrane concentration batches does not reach the preset number, the number of membrane concentration test batches will continue to be increased until the number of qualified membrane concentration batches reaches the preset requirement. The membrane pressure difference ΔP of all qualified membrane concentration batches is then calculated. m Sort by numerical value from smallest to largest, and select the preset high quantile value ΔP. h As a reference value for the upper limit of membrane pressure differential adjustment; the operating pressure P run Sort by numerical value from smallest to largest, and select the preset high quantile value P. hAs a reference value for the upper limit of operating pressure adjustment; the product water flow rate Q p Sort by numerical value from smallest to largest, and select the preset lowest percentile value Q. l This serves as a lower limit reference value for permeate flow rate adjustment. Upper limit of membrane pressure difference ΔP max =min(ΔP rated ΔP h Operating pressure limit P max =min(P) rated P h ), lower limit of water production flow rate Q min =Q l ; where ΔP rated For the membrane concentration unit to allow membrane pressure differential, P rated The allowable operating pressure for the membrane concentration unit.

[0024] Before the system is put into operation, a preset number of electrolysis test batches are continuously collected. For each electrolysis test batch, the concentration C of copper ions in the concentrate after mixing in the concentrate buffer tank is recorded. mix The conductivity E of the concentrate after mixing in the concentrate buffer tank mix The pH value Y of the concentrate after mixing in the concentrate buffer tank mix Single batch liquid inlet volume V b Electrolysis voltage U, electrolysis current I, residual copper ion concentration C r residual liquid volume V r Mass M before cathode electrolysis bef Mass M after cathode electrolysis aft The electricity meter reading (W) at the start of electrolysis for this batch bef And the electricity meter reading W at the end of this batch of electrolysis aft Theoretical copper quantity M0 = C mix ×V b Copper recovery amount M=M aft -M bef Electrolysis power consumption W=W aft -W bef Copper recovery rate R = M / M0, residual copper ratio D = C r ×V r / M0, unit copper recovery energy consumption K=W / M. When R≥R0, D≤D0, K≤K0, and the rated voltage range, rated current, and upper limit of the electrolytic cell liquid level of the electrolytic power supply are not exceeded during electrolysis, the batch is recorded as a qualified electrolysis batch; where R0 is the preset minimum copper recovery rate, D0 is the preset maximum residual copper ratio, and K0 is the preset maximum unit copper recovery energy consumption. If the number of qualified electrolysis batches does not reach the preset number of qualified electrolysis batches, the number of electrolysis commissioning batches will continue to be increased until the number of qualified electrolysis batches reaches the preset requirement.

[0025] Sort the copper ion concentration C of the concentrate from all qualified electrolysis batches in ascending order, and take the preset low quantile value as the preset lower limit C of the electrolytic copper ion concentration. min The preset high quantile value is taken as the preset upper limit of the electrolytic copper ion concentration C. max The preset electrolytic copper ion concentration range [C] was obtained. min C max The conductivity E of the concentrate from all qualified electrolysis batches is sorted in ascending order, and the preset low quantile value is taken as the preset lower limit of electrolytic conductivity E. min The preset high quantile value is taken as the preset upper limit of electrolytic conductivity E. max The preset electrolytic conductivity range [E] was obtained. min E max The pH value Y of the concentrate from all qualified electrolysis batches was determined. mix Sort by numerical value from smallest to largest, and take the preset low quantile value as the preset lower limit of electrolysis pH Y. min The preset high quantile value is taken as the preset upper limit of electrolysis pH Y. max The preset electrolysis pH range [Y] was obtained. min Y max ].

[0026] In one specific embodiment, the preset number of membrane concentration test batches and the preset number of electrolysis test batches are both 30, the preset number of qualified electrolysis batches is 15, the preset lower percentile is the 10th percentile, and the preset upper percentile is the 90th percentile.

[0027] Upper limit of liquid level H in membrane concentration unit mmax The lower of the highest designed operating liquid level of the membrane concentration unit and the overflow liquid level of the membrane concentration unit minus the safety margin is taken. Upper limit H of the concentrate buffer tank level. bmax =min(H b1 H b2 -ΔH b ), where H b1 Take the highest working liquid level recorded in the design drawings or equipment nameplate of the concentrate buffer tank; H b2 The height is obtained through the center height of the overflow outlet or the lowest point height of the overflow pipe inlet; ΔH b The safety margin for the concentrate buffer tank level is determined by the sum of the maximum permissible measurement error of the concentrate buffer tank level sensor, the continued feed height of the feed pump during the shutdown response time, and the preset overflow prevention margin. Electrolytic cell upper limit H emax =min(H e1 H e2 -ΔH e ), where H e1 Take the highest working liquid level recorded in the electrolytic cell design drawings or equipment nameplate; H e2The height is obtained from the center height of the overflow outlet of the electrolytic cell or the height of the lowest point of the overflow pipe inlet; ΔH e The safety margin for the electrolytic cell level is determined by the sum of the maximum permissible measurement error of the electrolytic cell level sensor, the continued liquid inlet height of the inlet pump during the shutdown response time, and the preset anti-overflow margin.

[0028] Furthermore, after completing parameter acquisition, parameter calculation, and threshold setting, the collaborative control unit establishes an operational parameter correlation model. This operational parameter correlation model is a rule-based model consisting of parameter input, threshold comparison, formula calculation, and status output, including correlations for membrane concentration operation, membrane concentration effluent, concentrate buffer, and electrolysis feed.

[0029] The input parameters for the membrane concentration operation include the membrane pressure difference ΔP. m Operating pressure P run and water production flow rate Q p The output results include the continued concentration state F of the membrane concentration unit. m When ΔP m ≤ΔP max P run ≤P max And Q p ≥Q min When, output F m =1 indicates that the membrane concentration unit is ready to continue concentration; otherwise, output F. m =0 indicates that the membrane concentration unit does not have the conditions to continue concentration.

[0030] The input parameters for the membrane concentrate effluent correlation section include the copper ion concentration C, concentrate conductivity E, concentrate pH value Y, and concentrate buffer tank level H of the concentrate output from the membrane concentration unit. b The output results include the effluent state F adapted to the membrane concentration unit. b When C min ≤C≤C max E min ≤E≤E max Y min ≤Y≤Y max And H b <H bmax When, output F b =1 indicates that the concentrate output from the membrane concentration unit meets the suitable effluent conditions; otherwise, output F. b =0 indicates that the concentrate output from the membrane concentration unit has not yet met the appropriate discharge conditions.

[0031] The input parameters for the concentrate buffer correlation section include the copper ion concentration C of the concentrate after mixing in the concentrate buffer tank. mix Concentrated liquid conductivity E mix pH value of concentrated solution Ymix The current liquid volume V in the concentrate buffer tank b0 The lowest extractable liquid level in the concentrate buffer tank corresponds to the volume V. bmin and single batch liquid inlet volume V b The output results include the electrolytic adaptation state F. e The collaborative control unit follows V a =V b0 -V bmin Calculate the available liquid volume V in the concentrate buffer tank. a When C min ≤C mix ≤C max E min ≤E mix ≤E max Y min ≤Y mix ≤Y max And V a ≥V b When, output F e =1 indicates that the concentrate is in an electrolytic adaptation state; otherwise, output Fe=0 indicates that the concentrate is in a non-electrolytic adaptation state.

[0032] The input parameters for the electrolytic electrolyte inlet correlation section include the inlet copper load M. load , Lower limit of copper loading for influent M min The remaining acceptable volume V of the electrolytic cell e Single batch liquid inlet volume V b Electrolysis voltage U, electrolysis current I, and electrolysis power supply fault-free signal G. ps Operating status of the electrolytic recovery unit S t The operating load L of the electrolytic recovery unit, and the output results include the allowable state F of the electrolytic feed solution. in The collaborative control unit adjusts the operating status S of the electrolytic recovery unit. t Determine the voltage allowable state F u When S t In the state of waiting to be injected and G ps When =1, the output is F. u =1; when S =1; t For electrolysis operating status, G ps =1 and U min ≤U≤U max When, output F u =1; otherwise, output F. u =0. When M load ≥M min V e ≥V b F u =1、I≤I max And when L≤1, output F in=1 indicates that the concentrate buffer tank is allowed to feed liquid into the electrolytic recovery unit; otherwise, output F. in =0 indicates that the liquid feed into the electrolysis recovery unit is suspended.

[0033] The collaborative control unit invokes the membrane concentration operation correlation component and the membrane concentration effluent correlation component from the operating parameter correlation model for control. When F m =1 and F b When F = 0, the collaborative control unit controls the membrane concentration unit to continue concentration; when F m =1 and F b When F = 1, the control membrane concentration unit sends the concentrate into the concentrate buffer tank; when F m =0 and F b When F = 1, the co-control unit stops the membrane concentration unit from continuing concentration and sends the current concentrate into the concentrate buffer tank before the concentrate buffer tank reaches its upper limit. If the concentrate buffer tank reaches its upper limit, the inlet and outlet of the membrane concentration unit are suspended, and the liquid level interlock control process is initiated. m =0 and F b When the concentration ratio is 0, the co-control unit stops the membrane concentration unit from continuing concentration and determines whether the current concentrate meets the preset temporary storage conditions. The preset temporary storage conditions are: the current concentrate's copper ion concentration, conductivity, and pH value are within the preset temporary storage ranges for copper ion concentration, conductivity, and pH, respectively. If the current concentrate meets the preset temporary storage conditions and the concentrate buffer tank has not reached its upper limit, the current concentrate is sent to the concentrate buffer tank for temporary storage, and its direct entry into the electrolysis recovery unit is prohibited. If the current concentrate does not meet the preset temporary storage conditions, discharge to the concentrate buffer tank is stopped, and an abnormal handling command is output. The determination of the membrane concentration discharge correlation section is used to control whether the concentrate output by the membrane concentration unit meets the appropriate discharge conditions; it does not indicate that the electrolysis recovery unit is ready to receive the concentrate.

[0034] When the concentrate buffer tank reaches the upper limit of the liquid level, the collaborative control unit no longer executes the membrane concentrate outlet control alone, but switches to the liquid level interlock control process described later.

[0035] After the concentrate enters the concentrate buffer tank, the parameter acquisition unit collects and extracts the copper ion concentration C of the mixed concentrate in the concentrate buffer tank. mix Concentrated liquid conductivity E mix pH value of concentrated solution Y mix and the current liquid level H in the concentrate buffer tank b The collaborative control unit obtains the current liquid volume V in the concentrate buffer tank according to the concentrate buffer tank level-volume calibration table. b0 And based on the lowest extractable liquid level H in the concentrate buffer tank minThe corresponding calibration volume is the volume V corresponding to the lowest extractable liquid level. bmin The volume of concentrate buffer tank that can accommodate the incoming liquid is V. a According to V a =V b0 -V bmin Calculation. The collaborative control unit will calculate C. mix E mix Y mix V b0 V bmin and V b Input the concentrated buffer correlation part of the operating parameter correlation model, and based on the electrolysis adaptation state F output by this part... e Determine the state of the concentrated solution after mixing. When F e When F = 1, the concentrated solution is determined to be in an electrolytically compatible state; when F e When the value is 0, the concentrated solution is determined to be in a non-electrolysis-compatible state. The electrolysis-compatible state indicates that the concentrated solution itself is suitable as an electrolysis feed solution.

[0036] The collaborative control unit calculates the influent copper load based on the copper ion concentration in the concentrate buffer tank and the single batch feed rate to be introduced into the electrolytic recovery unit. Influent copper load M load The total amount of copper in the concentrate entering the electrolytic recovery unit is determined by M, assuming the copper ion concentration in the concentrate is consistent with the unit of the single batch feed volume. load =C mix ×V b calculate.

[0037] Single batch liquid inlet volume V b This refers to the volume of concentrate entering the electrolytic recovery unit from the concentrate buffer tank in a single operation. When C... mix When C ≤ 0, the collaborative control unit determines that liquid is not allowed to be fed into the electrolytic recovery unit; when C mix When >0, the single batch liquid inlet volume V b According to V b =min(V e V a Q in ×T in M e / C mix ) calculate; where V e V represents the remaining acceptable volume of the electrolyzer. a Q is the volume of concentrate that can be fed into the buffer tank. in T is the rated flow rate of the inlet pump. in M represents the permissible duration of a single infusion. e C is the rated single-batch copper capacity of the electrolytic recovery unit. mix This represents the copper ion concentration in the concentrate after mixing in the concentrate buffer tank. The remaining acceptable volume V in the electrolytic cell...e The parameter acquisition unit acquires the current electrolytic cell liquid level H according to the following rules. e The collaborative control unit obtains the current electrolyzer level H based on the electrolyzer level-volume calibration table. e The corresponding current volume V e0 And obtain the upper limit H of the electrolytic cell liquid level. emax The corresponding upper limit volume V emax The remaining acceptable volume V of the electrolytic cell e According to V e =V emax -V e0 Calculation. When the electrolytic cell is a constant cross-section cell, V e You can also follow V e =A e0 ×(H) emax -H e ) calculate, where A e0 V represents the effective cross-sectional area of ​​the electrolytic cell. When the electrolytic cell is not a uniform cross-section cell, V is obtained by referring to the electrolytic cell level-volume calibration table or by linear interpolation. e0 and V emax When V b When the value is ≤0, it is determined that liquid is not allowed to be fed into the electrolytic recovery unit.

[0038] Furthermore, the lower limit of the copper loading in the liquid is M. min According to M min =max(M 10 W base / K0) is calculated; where M 10 W is the preset low quantile value of the theoretical copper content M0 of all qualified electrolytic batches, sorted from smallest to largest. base K0 represents the basic power consumption for single-batch start-up and cyclic operation of the electrolytic recovery unit, while K0 represents the maximum allowable energy consumption per unit of copper recovery in the system. base The difference in energy meter readings was obtained through no-load cycle testing, meaning the electrolytic recovery unit performed only one batch start-up and cycle operation without copper recovery. The preset electrolytic voltage range [U] min U max According to U min =max(U psmin U 10 ), U max =min(U psmax U 90 ) calculate, where U psmin and U psmax These are the lower and upper limits of the rated output voltage of the electrolytic power supply, respectively, U 10 and U 90These are the preset lower and upper percentile values ​​of the electrolysis voltage during the stable electrolysis stage for a qualified electrolysis batch. The stable electrolysis stage is the electrolysis operation phase from the completion of single-batch liquid feeding and the preset power supply stabilization time until the end of the electrolysis for this batch. The preset upper limit of the electrolysis current I... max According to I max =min(I ps J max ×A e ) calculate, where I ps J is the rated current of the electrolytic power supply. max For the allowable current density of the electrode, A e The effective area of ​​the electrode. The operating load L of the electrolytic recovery unit is calculated according to L=max(I / I max V e0 / V emax M load / M e ) Calculation; where I is the current electrolysis current, I max To preset the upper limit of the electrolysis current, V e0 V represents the current liquid volume in the electrolytic cell. emax M is the effective volume corresponding to the upper limit of the electrolytic cell liquid level. load For the copper loading in the inlet, M e The rated single-batch copper capacity for the electrolytic recovery unit. When L≤1, it is determined that the operating load of the electrolytic recovery unit has not exceeded the preset load limit; when L>1, it is determined that the operating load of the electrolytic recovery unit exceeds the preset load limit.

[0039] The collaborative control unit calls the electrolysis liquid inlet correlation part in the operating parameter correlation model to determine whether liquid inlet is allowed, and sets M load M min V e V b U, I, G ps S t And the L input is associated with the electrolyte feed section. When the electrolyte feed associated section outputs F in =1, and the output F of the concentrate buffer associated part e When F = 1, it is determined that the electrolytic recovery unit meets the conditions for receiving concentrated liquid, and the coordination control unit controls the concentrated liquid in the concentrated liquid buffer tank to enter the electrolytic recovery unit in a single batch feed rate; when F in =0 or F e When the value is 0, the feeding of liquid into the electrolytic recovery unit is suspended, and the concentrate is temporarily stored in the concentrate buffer tank.

[0040] like Figure 4 The diagram shows the trade-off between recovery rate and unit energy consumption. During the operation of the membrane concentration unit, the endpoint of membrane concentration is simultaneously affected by factors such as volumetric recovery rate, feed water concentration, membrane area, number of concentration stages, unit energy consumption, and concentrate concentration. Figure 4 This plot shows the relationship between volumetric recovery rate and SEC (Self-Energy Conversion Rate), with the horizontal axis representing volumetric recovery rate (%) and the vertical axis representing SEC (Self-Energy Conversion Rate) in kWh / m³. 3 Each marker in the diagram represents a membrane concentration operating condition. The color of the marker indicates the influent concentration in mg / L. Dark purple, blue, cyan, and yellow represent influent copper ion concentrations of 5.0 mg / L, 35.0 mg / L, 70.0 mg / L, and 125.0 mg / L, respectively. The size of the marker indicates the membrane area, and the shape indicates different membrane concentration stages. The number of membrane concentration stages refers to the number of membrane concentration treatment stages that the copper-containing cleaning water or its concentrate passes through sequentially. A first-stage membrane concentration means the concentrate has undergone one membrane concentration treatment stage; a second-stage membrane concentration means the first-stage concentrate continues into a second-stage membrane concentration treatment stage, and so on. Figure 4 It can be seen that under different combinations of influent concentration, membrane area, and membrane concentration stages, an increase in volumetric recovery rate does not necessarily correspond to a decrease in unit energy consumption. In some operating conditions, further increasing the recovery rate will significantly increase unit energy consumption. Therefore, when the co-control unit outputs a continued concentration state, it should not rely solely on volumetric recovery rate or concentration ratio, but should consider membrane pressure difference, operating pressure, permeate flow rate, and subsequent electrolysis adaptation conditions to reduce the risk of increased energy consumption due to over-concentration. Figure 5 The graph shows the relationship between concentration level and cost. Figure 5 The x-axis represents the final concentrate concentration in mg / L, and the y-axis represents the unit water production cost (LCOW) in yuan / m³. 3 Each scatter point in the graph represents a membrane concentration operating condition; the color of the scatter point indicates the membrane concentration stage, and the size of the scatter point indicates the copper ion concentration in the feed water, in mg / L. Figure 5 It can be seen that when the final concentrate concentration is low, the unit permeate cost (LCOW) is low; as the final concentrate concentration increases, the unit permeate cost generally increases, especially when the final concentrate concentration approaches the higher range, where the unit permeate cost increases significantly. This relationship indicates that whether the concentrate output from the membrane concentration unit is suitable for feeding into the concentrate buffer tank cannot be determined solely by whether the copper ion concentration increases. It also requires a comprehensive assessment considering the concentrate conductivity, pH value, number of membrane concentration stages, concentrate buffer tank level, and the receiving status of the subsequent electrolytic recovery unit. This helps avoid simply pursuing a higher concentration level, which could lead to increased membrane concentration operating costs. Figure 6 The diagram shows the concentration enhancement under the low-energy consumption scheme. Figure 6The horizontal axis represents the volumetric recovery rate (%), and the vertical axis represents the final copper ion concentration in the concentrate (mg / L). The colored scatter points in the graph represent the relationship between the volumetric recovery rate and the final concentrate copper ion concentration under different influent copper ion concentrations. The influent concentrations of 5, 35, 70, and 125, respectively, indicate influent copper ion concentrations of 5 mg / L, 35 mg / L, 70 mg / L, and 125 mg / L. Figure 6 It can be seen that when the influent concentration is high, a high concentrate concentration may still be achieved even with a low volumetric recovery rate; conversely, when the influent concentration is low, a high volumetric recovery rate is required to reach the target concentrate concentration. Therefore, in this embodiment, the collaborative control unit outputs the continued concentration state and the adapted discharge state through the membrane concentration operation correlation section and the membrane concentration discharge correlation section, respectively. This allows the membrane concentration control to no longer rely on a fixed recovery rate or a fixed concentration ratio, but rather to make a comprehensive judgment based on the concentrate copper ion concentration, conductivity, pH value, buffer tank level, and electrolysis adaptation conditions.

[0041] During the processes of discharging concentrate from the membrane concentration unit to the concentrate buffer tank, feeding concentrate from the concentrate buffer tank to the electrolytic recovery unit, and receiving concentrate in the electrolytic recovery unit, the coordination control unit performs level interlock control on the membrane concentration unit, the concentrate buffer tank, and the electrolytic tank. Let the current liquid level of the membrane concentration unit be H. m The upper limit of the liquid level in the membrane concentration unit is H. mmax The membrane concentration unit restores the influent level to H. mr The concentrate buffer tank has been restored to the receiving liquid level of H. br And H br <H bmax The electrolytic cell was restored to a liquid level of H. er And H er <H emax Among them, H mr =H mmax -ΔH mr H br =H bmax -ΔH br H er =H emax -ΔH er ;ΔH mr ΔH br and ΔH er To address the recovery of the liquid level hysteresis, the values ​​are determined based on the sum of the maximum permissible measurement error of the corresponding liquid level sensor, the liquid level change during the pump shutdown response time, and the margin for preventing frequent start-stop operations.

[0042] When H m ≥H mmax H b ≥H bmax or H e ≥Hemax When at least one of the following conditions is met, the coordinated control unit executes the liquid level release control in a backward-to-forward order: first, release the receiving capacity of the electrolyzer; then, release the receiving capacity of the concentrate buffer tank; and finally, restore the inlet and outlet of the membrane concentration unit. Specifically, when H... e ≥H emax When the co-control unit stops the feed of concentrate buffer tank to electrolytic recovery unit and judges the liquid state in electrolytic cell; when F end =0 and C r >C rmax When F is in use, the electrolysis recovery unit continues electrolysis and accumulates the supplementary electrolysis time or the number of supplementary electrolysis cycles; when F end =1 or C r ≤C rmax At that time, the drain valve is opened to drain the liquid from the electrolytic cell until H... e ≤H er When the supplementary electrolysis time reaches the preset maximum supplementary electrolysis time, or the number of supplementary electrolysis cycles reaches the preset maximum number of supplementary electrolysis cycles, C r Still higher than C rmax When this occurs, the co-control unit stops electrolysis and outputs an abnormal handling command for residual electrolytic liquid, prohibiting the concentrate buffer tank from continuing to feed liquid into the electrolysis recovery unit until the liquid level in the electrolytic cell is released to H. er The following or abnormal handling has been completed. Among them, F... end =0 indicates that the current batch is not completed, F end =1 indicates that the current batch has been completed, C rmax The upper limit of copper ion concentration in the residual liquid is preset.

[0043] When H b ≥H bmax When this occurs, the co-control unit prohibits the membrane concentration unit from continuing to discharge liquid into the concentrate buffer tank, and determines the electrolytic compatibility status of the concentrate in the concentrate buffer tank; when F e =1、F in =1 and H e ≤H er At that time, the concentrate buffer tank is controlled to feed liquid into the electrolytic recovery unit until H b ≤H br When F e When F = 0, the collaborative control unit stops the feed of concentrate from the buffer tank to the electrolytic recovery unit, and re-performs mixing sampling and electrolytic compatibility judgment on the concentrate in the buffer tank; if F is continuously judged a preset number of times... e If the value is still 0, an abnormal handling command for the concentrate buffer tank will be output, and the membrane concentration unit will be prohibited from continuing to discharge liquid into the concentrate buffer tank until the liquid level in the concentrate buffer tank drops to H. br The following or abnormal handling is completed. When H m ≥H mmaxAt that time, the co-control unit stops the copper-containing cleaning water from continuing to enter the membrane concentration unit, and at H b ≤H br At that time, the control membrane concentration unit discharges liquid into the concentrate buffer tank until H m ≤H mr .

[0044] When any two or three of the membrane concentration unit, concentrate buffer tank, and electrolyzer simultaneously reach their corresponding upper liquid level limits, the collaborative control unit still processes them in the aforementioned backward-to-forward order; if H e ≥H emax If H b ≥H bmax Then in F e =1、F in =1 and H e ≤H er The capacity of the buffer tank for receiving concentrated liquid is then released; if H m ≥H mmax Then in H b ≤H br The liquid level in the membrane concentration unit is then released. When H... m ≥H mmax H b ≥H bmax And H e ≥H emax Simultaneously, upon activation, the collaborative control unit enters a full-full protection state, stopping the flow of copper-containing cleaning water into the membrane concentration unit, stopping the membrane concentration unit from discharging liquid into the concentrate buffer tank, and stopping the concentrate buffer tank from feeding liquid into the electrolytic recovery unit; subsequently, the collaborative control unit releases the liquid level in stages from back to front: first processing the electrolytic cell liquid level, when H... e ≤H er Next, determine whether the concentrate buffer tank is capable of feeding liquid into the electrolytic recovery unit; if F e =1 and F in =1, then the concentrate buffer tank is controlled to feed liquid into the electrolytic recovery unit until H b ≤H br When H b ≤H br Then, control the membrane concentration unit to discharge liquid into the concentrate buffer tank until H m ≤H mr When H e ≤H er H b ≤H br And H m ≤H mr Once both conditions are met, copper-containing cleaning water is reintroduced into the membrane concentration unit. If any stage is affected by F... e =0、F in =0、C rLong-term higher than C rmax If the equipment malfunctions and cannot release the liquid level, the corresponding upstream unit will remain stopped, and the corresponding abnormal handling command will be output.

[0045] The electrolysis recovery unit electrolyzes and recovers the concentrate entering it. During electrolysis, the parameter acquisition unit collects the electrolysis voltage, electrolysis current, and residual copper ion concentration C. r Before the start of this batch of electrolysis, the parameter acquisition unit recorded the cathode mass M before electrolysis. bef And the electricity meter reading W at the start of this batch of electrolysis bef After this batch of electrolysis is completed, the parameter acquisition unit records the mass M of the cathode after electrolysis. aft The electricity meter reading (W) at the end of this batch of electrolysis aft and residual liquid volume V r The collaborative control unit calculates the copper recovery rate, the proportion of copper in the residual liquid, and the energy consumption per unit of copper recovery based on the theoretical copper quantity entering the electrolytic recovery unit, the mass of the cathode before and after electrolysis, the copper ion concentration in the residual liquid, the volume of the residual liquid, and the difference in the energy meter reading. The theoretical copper quantity M0 is calculated according to M0=C in ×V b Calculate, C in V represents the copper ion concentration of the concentrate when it enters the electrolytic recovery unit. b This refers to the single batch feed volume; the copper recovery volume M is calculated based on the mass difference before and after cathode electrolysis, M = M aft -M bef The amount of copper remaining in the residual liquid, M r According to M r =C r ×V r Calculations: Copper recovery rate R is calculated using R=M / M0; residual copper ratio D is calculated using D=M r / M0 calculation; Electrolysis power consumption W is calculated based on the difference in electricity meter readings, W=W aft -W bef The energy consumption K per unit of copper recovery is calculated according to K=W / M.

[0046] Through the above scheme, the effluent discharge from the membrane concentration unit is no longer determined solely by membrane-side parameters such as membrane pressure difference, operating pressure, or permeate flow rate. Instead, it is determined by combining concentrate parameters and the concentrate buffer tank level to decide whether effluent discharge to the concentrate buffer tank is permissible. After the concentrate enters the concentrate buffer tank, the electrolytic compatibility is further assessed based on the copper ion concentration, conductivity, pH, and available feed volume of the mixed concentrate. Before the concentrate enters the electrolytic recovery unit, further judgment is made based on the feed copper load and the receiving conditions of the electrolytic recovery unit. This achieves coordinated control between the membrane concentration unit, the concentrate buffer tank, and the electrolytic recovery unit, improving the copper resource recovery rate in copper-containing cleaning water and reducing the energy consumption per unit of copper recovery.

[0047] Example 2: Based on Example 1, this example further corrects the lower limit of the copper loading for influent. The collaborative control unit adds an electrolysis result feedback correlation part to the operating parameter correlation model. The input parameters of the electrolysis result feedback correlation part include the copper recovery rate R, residual copper ratio D, unit copper recovery energy consumption K, full state of the concentrate buffer tank, and the current copper loading M to be influent. load The output results include the lower limit M of the copper loading for the next batch of liquid infusion. min The full state of the concentrate buffer tank is determined by the concentrate buffer tank level H. b Upper limit H of the concentrate buffer tank bmax The comparison result is determined; when H b ≥H bmax When H is full, it is recorded as a full slot; when H is full, it is recorded as a full slot. b <H bmax When this occurs, it is recorded as a non-full slot state.

[0048] like Figure 2 The diagram shown illustrates the feedback correction module for the lower limit of the copper inlet load. The electrolysis result feedback correlation section uses the copper recovery rate, residual copper ratio, unit copper recovery energy consumption, concentrate buffer tank full state, and copper inlet load of the most recent preset number of completed electrolysis batches as input parameters to judge the electrolysis results of consecutive batches and output the lower limit of the copper inlet load for the next batch. When the residual copper ratio or unit copper recovery energy consumption is too high, it indicates that the electrolysis effect or energy consumption performance under the current copper inlet load condition is poor; therefore, the lower limit of the copper inlet load for the next batch is increased. When the copper recovery rate, residual copper ratio, and unit copper recovery energy consumption are all within a certain range... Within the set range, the current lower limit of the copper inlet load is maintained. When the concentrate buffer tank is full within a continuous preset judgment period, and the current copper inlet load is lower than the current lower limit of the copper inlet load, the co-control unit further reads the results of the most recent preset number of completed electrolysis batches before that judgment period. If the copper recovery rate, residual copper ratio, and unit copper recovery energy consumption of these completed electrolysis batches all meet the set requirements, the lower limit of the copper inlet load for the next batch is reduced, ensuring that the corrected lower limit is not lower than the preset minimum lower limit, thereby enabling the electrolysis inlet conditions to be corrected based on the results of continuous batch operation. Figure 7 The graph shows the continuous batch copper recovery rate variation. After the electrolytic recovery unit completes continuous batch electrolysis, the co-control unit sets the lower limit M of the copper feed load for the next batch based on the copper recovery rate R, residual copper ratio D, and unit copper recovery energy consumption K of the completed batches. min Provide feedback and make corrections. Figure 7 This chart presents the changes in copper recovery rate for consecutive batches of electrolytically completed operations. The horizontal axis represents the batch number, and the vertical axis represents the recovery rate. The green line represents the copper recovery rate R for each batch, and the light green shaded area represents the acceptable range for copper recovery rate. Figure 7It can be seen that the copper recovery rate of each batch fluctuates with the copper load in the influent, the state of the concentrate, and the electrolysis operation status, with some batches approaching the lower boundary of the acceptable range. When the copper recovery rate of the most recent preset number of completed electrolysis batches is lower than the preset minimum copper recovery rate R0, it indicates that the copper recovery effect under the current influent conditions has deteriorated, and the co-control unit can accordingly increase the lower limit of the copper load in the influent for the next batch. Figure 8 The diagram shows the residual liquid ratio and the energy consumption constraint per unit of copper recovery. Figure 8 The horizontal axis represents the batch number, the left vertical axis represents the residual copper ratio, and the right vertical axis represents the energy consumption per unit of copper recovery. The pink line represents the residual copper ratio D, and the orange line represents the energy consumption per unit of copper recovery K. The horizontal dashed lines in the figure represent the upper limits of the residual copper ratio constraint D0 and the upper limits of the energy consumption per unit of copper recovery K0, respectively. Figure 8 It can be seen that the residual copper ratio and unit copper recovery energy consumption are not fixed values, but fluctuate with batches, with some batches approaching or exceeding the upper limit of the constraint. This relationship indicates that when D is higher than D0 or K is higher than K0, under the current influent copper load conditions, there may be problems such as insufficient copper deposition, high residual copper content, or high unit copper recovery energy consumption. Therefore, the co-control unit increases the upward adjustment step size based on the current lower limit of the influent copper load, so that the subsequent concentrate needs to reach a higher influent copper load before entering the electrolytic recovery unit. Figure 9 The following is a feedback correction diagram for the lower limit of the copper load for the next batch of influent. Figure 9 The horizontal axis represents the batch number, and the vertical axis represents the copper load. The black broken line and black dots represent the actual copper load of each batch or the current copper load to be injected, M. load The current copper loading unit is kg / batch. The blue stepped line represents the lower limit of the copper loading capacity (M). min The values ​​updated with each batch are shown in gray shaded areas, indicating the judgment window when the concentrate buffer tank is in a continuously full state. Orange triangles indicate upward adjustment actions, and blue triangles indicate downward adjustment actions. The upward and downward adjustment windows respectively mark the trigger M. min The range of batch adjustments, both upward and downward. (By...) Figure 9 It can be seen that when the copper recovery rate, residual copper ratio, or unit copper recovery energy consumption of the completed electrolysis batch deteriorates, M min The load was increased; when the concentrate buffer tank is full within a continuous preset judgment period, and the current copper load to be added is M. load Below the current M min And when the most recent consecutive preset number of completed electrolysis batches before this judgment period all satisfy R≥R0, D≤D0, K≤K0, M min It was appropriately lowered. Thus, it is below M. minThe current concentrate to be fed does not generate R, D, or K. The feedback is based on the previously completed electrolysis batches, which can avoid contradictions in the feedback logic closed loop, while taking into account the electrolysis recovery efficiency, unit energy consumption, and the requirements for continuous system operation.

[0049] Specifically, the collaborative control unit invokes the electrolysis result feedback correlation part of the operating parameter correlation model to correct the lower limit of the copper load for the next batch. The electrolysis result feedback correlation part uses the copper recovery rate R, residual copper ratio D, and unit copper recovery energy consumption K of the most recent consecutive preset number of completed electrolysis batches, as well as the current full state of the concentrate buffer tank and the current copper load M to be added. load As input parameters, the corrected lower limit of the copper loading for the next batch is output as M. min '.

[0050] When, in the most recent consecutive pre-set number of completed electrolysis batches, the copper recovery rate R is lower than the pre-set minimum copper recovery rate R0, or the residual copper ratio D is higher than the pre-set maximum residual copper ratio D0, or the unit copper recovery energy consumption K is higher than the pre-set maximum unit copper recovery energy consumption K0, the coordinated control unit will adjust the current inlet copper load lower limit M. min Based on this, the step size ΔM for increasing the lower limit of the copper inlet load is increased. up And with the highest value M allowed for increasing the results and the lower limit of the influent copper load. minmax The smaller value in M ​​is used as the lower limit of the copper load for the next batch of liquid inlet after correction. min =min(M) min +ΔM up M minmax ).

[0051] When the copper recovery rate R, residual copper ratio D, and unit copper recovery energy consumption K of the most recent consecutive preset number of completed electrolysis batches are all within the set range, and the current concentrate buffer tank has not reached the upper limit of liquid level within the consecutive preset judgment period, the collaborative control unit will follow M... min '=M min Maintain the current lower limit of the copper inlet load.

[0052] When the concentrate buffer tank reaches the upper limit of the liquid level within a continuous preset judgment period, and the current copper load to be added is M load <M min Furthermore, if the most recent consecutive preset number of completed electrolysis batches before this continuous preset judgment period all satisfy R≥R0, D≤D0, and K≤K0, the collaborative control unit will adjust the current inlet copper load lower limit M. min Based on the reduction of the lower limit of the copper inlet load, the step size ΔM is adjusted downwards. down And based on the deduction result and the preset minimum lower limit M min0 The larger value in M ​​is used as the lower limit of the copper load for the next batch of liquid inlet, after correction. min=max(M) min -ΔM down M min0 ).

[0053] Among them, M min 'This is the revised lower limit of the copper loading for the next batch of influent, ΔM' up To adjust the step size of the lower limit of the copper inlet load, ΔM down To adjust the step size of the copper inlet load, M min0 To preset the minimum lower limit, M minmax ΔM represents the highest permissible value for the lower limit of the copper inlet load; up and ΔM down According to the rated single batch copper processing capacity M of the electrolytic recovery unit e The preset ratio is determined, M min0 Take the minimum copper load corresponding to maintaining the unit copper recovery energy consumption not exceeding K0 in the electrolytic recovery unit, M. minmax According to the rated single-batch copper processing capacity M of the electrolytic recovery unit e The system allows a maximum copper load per batch, and M is determined. minmax Not exceeding the rated single-batch copper capacity M of the electrolytic recovery unit e The number of recently completed electrolysis batches, which is a preset quantity, is denoted as N. f N f It is an integer greater than 1.

[0054] In this embodiment, the copper recovery rate, residual copper ratio, and unit copper recovery energy consumption after electrolysis are no longer just statistical data, but are used to provide feedback and correct the lower limit of the copper load for the next batch. This allows the conditions for the concentrate to enter the electrolysis recovery unit to be adjusted according to the electrolysis effect of consecutive batches, thereby further reducing the risk of increased unit copper recovery energy consumption caused by low copper load batches and improving the stability of the electrolysis recovery process.

[0055] Example 3: This example provides a multi-parameter collaborative control method for copper-containing cleaning water recovery in circuit board manufacturing enterprises. This method is applied to copper-containing cleaning water recovery and treatment equipment in circuit board manufacturing plants. The equipment includes a membrane concentration unit and an electrolytic recovery unit. This method can be executed by a collaborative control unit and works in conjunction with a concentrate buffer tank, a parameter acquisition unit, the membrane concentration unit, and the electrolytic recovery unit.

[0056] like Figure 3The flowchart shown is for a multi-parameter collaborative control method for copper-containing cleaning water recovery from circuit boards. First, the concentrated solution output from the membrane concentration unit is temporarily stored and mixed in a buffer tank located between the membrane concentration unit and the electrolytic recovery unit. Then, membrane concentration operating parameters, membrane concentrate output parameters, buffer tank status parameters, and electrolytic recovery status parameters are collected, and an operating parameter correlation model is established. The collaborative control unit outputs a continued concentration state and an appropriate output state based on the membrane concentration operating parameters and membrane concentrate output parameters. It outputs an electrolytic adaptation state based on the copper ion concentration, conductivity, pH value, and available feed volume of the concentrated solution after mixing in the buffer tank. It also outputs an electrolytic feed allowance state based on the feed copper load, remaining acceptable volume in the electrolytic cell, and electrolytic recovery status. Finally, based on the above states, the membrane concentration unit, the buffer tank, and the electrolytic recovery unit are controlled to operate in conjunction. Specifically, the method includes the following steps: The concentrate output from the membrane concentration unit is temporarily stored and mixed in a concentrate buffer tank located between the membrane concentration unit and the electrolytic recovery unit. The concentrate buffer tank is used to receive the concentrate output from the membrane concentration unit and mix concentrates that enter at different times, making the parameters of the concentrate before entering the electrolytic recovery unit more stable.

[0057] The system collects operating parameters for membrane concentration, parameters for the concentrated liquid output from the membrane concentration unit, parameters for the concentrate buffer, and parameters for the electrolytic recovery. Specifically, the operating parameters reflect whether the membrane concentration unit is suitable for continued concentration; the parameters reflect whether the concentrated liquid output from the membrane concentration unit is suitable for entering the concentrate buffer tank; the parameters reflect whether the mixed concentrate is suitable as the electrolytic feed solution; and the parameters reflect whether the electrolytic recovery unit is capable of receiving the concentrated liquid.

[0058] Establish an operational parameter correlation model. Based on the collected membrane concentration operational parameters, membrane concentrate effluent parameters, concentrate buffer state parameters, and electrolysis recovery state parameters, the collaborative control unit establishes an operational parameter correlation model consisting of parameter input, threshold comparison, formula calculation, and state output.

[0059] Based on the membrane concentration operating parameters and membrane concentrate effluent parameters, the system outputs a continued concentration status and an appropriate effluent status. Specifically, the collaborative control unit determines whether the membrane concentration unit meets the conditions for continued concentration based on the membrane concentration operating parameters and outputs a continued concentration status; it also determines whether the concentrate output by the membrane concentration unit meets the conditions for entering the concentrate buffer tank based on the membrane concentrate effluent parameters and outputs an appropriate effluent status.

[0060] The electrolysis adaptation state is output based on the copper ion concentration, conductivity, pH value, and available feed volume of the concentrated solution after mixing in the buffer tank. Specifically, when the copper ion concentration, conductivity, and pH value of the mixed concentrated solution meet the preset electrolysis adaptation range, and the available feed volume in the buffer tank meets the single batch feed requirements, the output indicates that the concentrated solution is in an electrolysis adaptation state; otherwise, the output indicates that the concentrated solution is in a non-electrolysis adaptation state.

[0061] The system outputs the permissible state for electrolytic liquid intake based on the copper load in the influent, the remaining acceptable volume of the electrolytic cell, and the electrolytic recovery status. Specifically, the co-control unit calculates the copper load influent based on the copper ion concentration of the mixed concentrate and the batch influent volume. It then combines this with the remaining acceptable volume of the electrolytic cell, electrolytic voltage, electrolytic current, fault-free signal from the electrolytic power supply, and the operating status of the electrolytic recovery unit to determine whether the electrolytic recovery unit is permitted to receive the concentrate, and outputs the permissible state for electrolytic liquid intake.

[0062] Based on the states of continued concentration, appropriate liquid discharge, electrolysis appropriateness, and permissible electrolysis feed, the membrane concentration unit, concentrate buffer tank, and electrolysis recovery unit are controlled to operate in tandem. When the continued concentration state indicates that continued concentration is permitted and the appropriate liquid discharge state indicates that liquid discharge is not permitted, the membrane concentration unit continues to concentrate. When the continued concentration state indicates that continued concentration is permitted and the appropriate liquid discharge state indicates that liquid discharge is permitted, the membrane concentration unit sends the concentrate into the concentrate buffer tank. When the electrolysis appropriateness state indicates that the concentrate is in an electrolysis appropriate state and the permissible electrolysis feed state indicates that liquid discharge is permitted, the concentrate in the concentrate buffer tank is controlled to enter the electrolysis recovery unit. When the electrolysis appropriateness state indicates that the concentrate is in a non-electrolysis appropriate state, or the permissible electrolysis feed state indicates that liquid discharge is not permitted, the feeding of liquid into the electrolysis recovery unit is suspended, and the concentrate continues to be temporarily stored in the concentrate buffer tank.

[0063] In this embodiment, the concentrate output from the membrane concentration unit does not directly enter the electrolytic recovery unit. Instead, it first enters the concentrate buffer tank for temporary storage and mixing. Then, based on the parameters of the mixed concentrate, the available liquid volume, the copper load of the liquid, and the receiving conditions of the electrolytic recovery unit, a multi-parameter coordinated judgment is made to achieve linkage control between the membrane concentration unit, the concentrate buffer tank, and the electrolytic recovery unit, thereby improving the stability of the copper-containing cleaning water recovery process.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A multi-parameter collaborative control system for copper-containing cleaning water recovery from circuit boards, characterized in that, A copper-containing cleaning water recycling and treatment equipment applied in circuit board manufacturing enterprises, the equipment includes a membrane concentration unit and an electrolytic recovery unit, and the system includes: A concentrate buffer tank is located between the membrane concentration unit and the electrolysis recovery unit to temporarily store and mix the concentrate output from the membrane concentration unit. The parameter acquisition unit is used to acquire membrane concentration operating parameters, membrane concentrate effluent parameters, concentrate buffer status parameters, and electrolysis recovery status parameters. The collaborative control unit is used to establish an operational parameter correlation model and output the continued concentration state and the appropriate effluent state based on the membrane concentration operation parameters and membrane concentration effluent parameters. It outputs the electrolysis appropriate state based on the copper ion concentration, conductivity, pH value and available feed volume of the mixed concentrate. It outputs the electrolysis feed allowable state based on the feed copper load, the remaining acceptable volume of the electrolytic cell and the electrolysis recovery state. The coordinated control unit controls the membrane concentration unit, the concentrate buffer tank, and the electrolysis recovery unit to operate in conjunction with each other based on the continued concentration status, the liquid outlet status, the electrolysis adaptation status, and the electrolysis inlet permission status.

2. The multi-parameter collaborative control system for copper-containing cleaning water recovery of circuit boards according to claim 1, characterized in that, The parameter acquisition unit is used to acquire membrane concentration operating parameters, membrane concentrate effluent parameters, concentrate buffer state parameters, and electrolysis recovery state parameters, including: The membrane concentration operating parameters include the inlet pressure of the membrane concentration unit, the outlet pressure of the membrane concentration unit, the operating pressure of the membrane concentration unit, the permeate flow rate, and the current liquid level of the membrane concentration unit. The parameters of the membrane concentrate output include the copper ion concentration, conductivity, pH, and buffer tank level of the concentrate output from the membrane concentration unit. The parameters of the concentrate buffer state include the copper ion concentration of the concentrate after mixing in the concentrate buffer tank, the conductivity of the concentrate, the pH of the concentrate, the current liquid volume in the concentrate buffer tank, the volume corresponding to the lowest extractable liquid level, the available liquid volume, and the single batch liquid volume. The electrolytic recovery status parameters include the electrolytic cell level, remaining acceptable volume of the electrolytic cell, electrolytic voltage, electrolytic current, fault-free signal of the electrolytic power supply, operating status of the electrolytic recovery unit, current batch completion status, residual copper ion concentration, residual volume, and operating load of the electrolytic recovery unit.

3. The multi-parameter collaborative control system for copper-containing cleaning water recovery of circuit boards according to claim 1, characterized in that, The establishment of the operational parameter correlation model includes: The collaborative control unit establishes a rule model consisting of parameter input, threshold comparison, formula calculation, and status output. The operating parameter correlation model includes a membrane concentration operation correlation part, a membrane concentration effluent correlation part, a concentrate buffer correlation part, and an electrolysis influent correlation part; The membrane concentration operation association section is used to output the continued concentration status, the membrane concentration outlet association section is used to output the appropriate outlet status, the concentrate buffer association section is used to output the electrolysis appropriate status, and the electrolysis inlet association section is used to output the electrolysis inlet permitted status.

4. The multi-parameter collaborative control system for copper-containing cleaning water recovery of circuit boards according to claim 1, characterized in that, The step of outputting the continued concentration state and the appropriate effluent state based on the membrane concentration operating parameters and the membrane concentration effluent parameters includes: The collaborative control unit uses the difference between the inlet pressure and the outlet pressure of the membrane concentration unit as the membrane pressure difference; When the membrane pressure difference is not higher than the upper limit of the membrane pressure difference, the operating pressure of the membrane concentration unit is not higher than the upper limit of the operating pressure, and the permeate flow rate is not lower than the lower limit of the permeate flow rate, the output indicates that the concentration is allowed to continue; otherwise, the output indicates that the concentration is not allowed to continue. When the copper ion concentration of the concentrate output by the membrane concentration unit is within the preset range of electrolytic copper ion concentration, the conductivity of the concentrate is within the preset range of electrolytic conductivity, the pH of the concentrate is within the preset range of electrolytic pH, and the liquid level of the concentrate buffer tank is lower than the upper limit of the liquid level of the concentrate buffer tank, the output indicates the appropriate liquid discharge state that allows liquid discharge; otherwise, the output indicates the appropriate liquid discharge state that does not allow liquid discharge.

5. The multi-parameter collaborative control system for copper-containing cleaning water recovery of circuit boards according to claim 1, characterized in that, The process of outputting the electrolysis adaptation state based on the copper ion concentration, conductivity, pH value, and available feed volume of the mixed concentrate includes: The collaborative control unit obtains the current liquid volume in the concentrate buffer tank based on the current liquid level in the concentrate buffer tank, and obtains the volume corresponding to the lowest extractable liquid level based on the lowest extractable liquid level in the concentrate buffer tank. The difference between the current liquid volume in the concentrate buffer tank and the volume corresponding to the lowest extractable liquid level is taken as the available liquid volume in the concentrate buffer tank. When the concentration of copper ions in the mixed concentrate is within the preset range of electrolytic copper ion concentration, the conductivity of the mixed concentrate is within the preset range of electrolytic conductivity, and the pH of the mixed concentrate is within the preset range of electrolytic pH, and the available feed volume is not less than the single batch feed volume, the output indicates that the concentrate is in an electrolytically adapted state; otherwise, the output indicates that the concentrate is in an electrolytically adapted state.

6. The multi-parameter collaborative control system for copper-containing cleaning water recovery of circuit boards according to claim 1, characterized in that, The step of outputting the permissible state for electrolytic liquid feeding based on the copper load of the influent, the remaining acceptable volume of the electrolytic cell, and the electrolytic recovery status includes: The collaborative control unit calculates the copper load of the influent based on the copper ion concentration of the concentrated solution after mixing in the concentrated solution buffer tank and the single batch influent volume. The current liquid volume in the electrolyzer is obtained based on the current liquid level in the electrolyzer, and the difference between the volume corresponding to the upper limit of the liquid level in the electrolyzer and the current liquid volume in the electrolyzer is taken as the remaining acceptable volume of the electrolyzer. When the electrolytic recovery unit is in the liquid-filling state and the electrolytic power supply is fault-free, the voltage is deemed permissible; when the electrolytic recovery unit is in the electrolytic operation state, the electrolytic power supply is fault-free and the electrolytic voltage is within the preset electrolytic voltage range, the voltage is deemed permissible; otherwise, the voltage is deemed not permissible. When the copper loading is not lower than the lower limit of the copper loading, the remaining acceptable volume of the electrolytic cell is not less than the single batch loading volume, the voltage is permissible, the electrolytic current is not higher than the preset upper limit of the electrolytic current, and the operating load of the electrolytic recovery unit is not higher than the preset upper limit of the load, the output indicates the electrolytic loading state that allows liquid to be fed; otherwise, the output indicates the electrolytic loading state that does not allow liquid to be fed.

7. The multi-parameter collaborative control system for copper-containing cleaning water recovery of circuit boards according to claim 1, characterized in that, The coordinated control unit controls the membrane concentration unit, concentrate buffer tank, and electrolysis recovery unit to operate in conjunction with each other based on the continued concentration state, the appropriate liquid discharge state, the electrolysis appropriate state, and the permissible electrolysis liquid inlet state. This includes: When the "Continue Concentration" state indicates that further concentration is allowed and the "Suitable Discharge" state indicates that discharge is not allowed, the membrane concentration unit is controlled to continue concentrating. When the "Continue Concentration" state indicates that continued concentration is allowed and the "Supply Discharge" state indicates that liquid discharge is allowed, the control membrane concentration unit will send the concentrate into the concentrate buffer tank. When the "Continue Concentration" state indicates that further concentration is not allowed and the "Adaptive Discharge" state indicates that discharge is allowed, the control membrane concentration unit stops further concentration and sends the current concentrate into the concentrate buffer tank before the concentrate buffer tank reaches the upper limit of the liquid level. If the concentrate buffer tank reaches the upper limit of the liquid level, the liquid level interlock control is switched to the liquid level interlock control. When the "Continue Concentration" state indicates that further concentration is not allowed and the "Suitable Discharge" state indicates that discharge is not allowed, the control membrane concentration unit stops further concentration and determines whether the current concentrate meets the preset temporary storage allowable conditions. If the current concentrate meets the preset temporary storage allowable conditions and the concentrate buffer tank has not reached the upper limit of the liquid level, the current concentrate is sent to the concentrate buffer tank for temporary storage, and the current concentrate is prohibited from directly entering the electrolysis recovery unit. If the current concentrate does not meet the preset temporary storage allowable conditions, the discharge to the concentrate buffer tank is stopped and an abnormal handling command is output. When the electrolysis adaptation status indicates that the concentrate is in the electrolysis adaptation state, and the electrolysis feed permission status indicates that feed is allowed, the concentrate in the concentrate buffer tank is controlled to enter the electrolysis recovery unit in a single batch feed rate; When the electrolysis adaptation status indicates that the concentrate is in a non-electrolysis adaptation state, or the electrolysis feed permission status indicates that feed is not allowed, feed to the electrolysis recovery unit is suspended, and the concentrate is temporarily stored in the concentrate buffer tank.

8. The multi-parameter collaborative control system for copper-containing cleaning water recovery of circuit boards according to claim 1, characterized in that, The collaborative control unit is also used to perform liquid level interlock control, including: When at least one of the current liquid level in the membrane concentration unit, the liquid level in the concentrate buffer tank, or the liquid level in the electrolyzer reaches the corresponding upper limit, the collaborative control unit executes the liquid level release control in a backward sequence. The order from back to front is as follows: first release the receiving capacity of the electrolyzer, then release the receiving capacity of the concentrate buffer tank, and finally restore the inlet and outlet of the membrane concentration unit. When the liquid level in the electrolytic cell reaches the upper limit of the electrolytic cell liquid level, the liquid feeding from the concentrate buffer tank to the electrolytic recovery unit is stopped, and the liquid in the electrolytic cell is discharged when the current batch is completed or the copper ion concentration of the residual liquid is not higher than the preset upper limit of the copper ion concentration of the residual liquid, until the liquid level in the electrolytic cell drops below the liquid level to be fed back into the electrolytic cell. When the liquid level in the concentrate buffer tank reaches the upper limit of the concentrate buffer tank level, the membrane concentration unit is prohibited from continuing to discharge liquid into the concentrate buffer tank. When the electrolysis adaptation state indicates that the concentrate is in the electrolysis adaptation state, the electrolysis liquid inlet permission state indicates that liquid inlet is permitted, and the liquid level in the electrolysis tank is not higher than the liquid level of the electrolysis tank recovery, the concentrate buffer tank is controlled to feed liquid into the electrolysis recovery unit until the liquid level in the concentrate buffer tank drops below the liquid level of the concentrate buffer tank recovery receiving unit. When the current liquid level of the membrane concentration unit reaches the upper limit of the membrane concentration unit liquid level, the copper-containing cleaning water is stopped from continuing to enter the membrane concentration unit. When the liquid level of the concentrate buffer tank is not higher than the concentrate buffer tank recovery receiving liquid level, the membrane concentration unit is controlled to discharge liquid into the concentrate buffer tank until the current liquid level of the membrane concentration unit drops below the membrane concentration unit recovery inlet water level.

9. The multi-parameter collaborative control system for copper-containing cleaning water recovery of circuit boards according to claim 1, characterized in that, The operating parameter correlation model also includes an electrolysis result feedback correlation component: The electrolysis result feedback correlation part takes the copper recovery rate, residual copper ratio, unit copper recovery energy consumption, full state of the concentrate buffer tank and the current copper load to be added as input parameters of the most recent consecutive preset number of completed electrolysis batches, and outputs the lower limit of the copper load for the next batch. The full state of the concentrate buffer tank is determined based on the comparison between the concentrate buffer tank level and the upper limit of the concentrate buffer tank level. When the residual copper ratio of the most recent consecutive preset number of completed electrolysis batches is higher than the preset maximum residual copper ratio, or the unit copper recovery energy consumption of the most recent consecutive preset number of completed electrolysis batches is higher than the preset maximum unit copper recovery energy consumption, the step size of the upper limit of the liquid copper load is increased based on the current lower limit of the liquid copper load to obtain the lower limit of the liquid copper load for the next batch. When the copper recovery rate, residual copper ratio and unit copper recovery energy consumption of the most recent consecutive preset number of completed electrolysis batches are all within the set range, the current lower limit of the copper inlet load will be used as the lower limit of the copper inlet load for the next batch. When the concentrate buffer tank reaches the upper limit of liquid level within a consecutive preset judgment period, and the current copper load to be added is lower than the current lower limit of copper load, and the most recent consecutive preset number of completed electrolysis batches before the consecutive preset judgment period all meet the requirements of copper recovery rate not lower than the preset minimum copper recovery rate, residual copper ratio not higher than the preset maximum residual copper ratio, and unit copper recovery energy consumption not higher than the preset maximum unit copper recovery energy consumption, the lower limit of copper load is reduced by the step size of the lower limit of copper load based on the current lower limit of copper load, and the larger value between the reduction result and the preset minimum lower limit is used as the lower limit of copper load for the next batch.

10. A multi-parameter collaborative control method for copper-containing cleaning water recovery from circuit boards, characterized in that, A copper-containing cleaning water recycling and treatment device applied in circuit board manufacturing enterprises, the copper-containing cleaning water recycling and treatment device includes a membrane concentration unit and an electrolytic recovery unit, the method comprising: The concentrate output from the membrane concentration unit is sent to a concentrate buffer tank located between the membrane concentration unit and the electrolysis recovery unit for temporary storage and mixing; Collect membrane concentration operating parameters, membrane concentrate effluent parameters, concentrate buffer status parameters, and electrolysis recovery status parameters; Establish an operational parameter correlation model, and output the continued concentration status and the appropriate effluent status based on the membrane concentration operational parameters and membrane concentration effluent parameters; The electrolysis adaptation state is output based on the copper ion concentration, conductivity, pH value, and available liquid volume of the concentrated solution after mixing in the concentrated solution buffer tank. The electrolytic liquid feeding permission status is output based on the copper loading, the remaining acceptable volume of the electrolytic cell, and the electrolytic recovery status. Based on the continued concentration status, the appropriate liquid discharge status, the electrolysis appropriate status, and the electrolysis liquid inlet permission status, the membrane concentration unit, the concentrate buffer tank, and the electrolysis recovery unit are controlled to operate in a coordinated manner.

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