An integrated extraction system and a control method thereof

Abstract

The application discloses an integrated extraction system and a control method thereof. The integrated extraction system comprises at least an extraction tank and a controller. The extraction tank is provided with at least a first speed reducer for adjusting a stirrer and a second speed reducer for adjusting up-and-down movement of a water phase adjusting pipe. The stirrer is arranged in a mixing tank of the extraction tank, and the water phase adjusting pipe is arranged in a clarification tank of the extraction tank. The controller is configured to acquire a feed flow of the extraction tank, solution information of the clarification tank and a stirring frequency of the stirrer, and perform PID control on the feed flow, the stirring frequency and a position of the water phase adjusting pipe according to the feed flow, the solution information and the stirring frequency. The embodiment of the application can realize automatic control of the extraction tank, reduce human factor interference and improve production line stability.

Description

Technical Field

[0001] This application relates to the field of extraction technology, and in particular to an integrated extraction system and its control method. Background Technology

[0002] Extraction is a method of transferring a component of a substance from one solvent to another by utilizing the property that substances have different solubilities or partition coefficients in two immiscible (or slightly soluble) solvents. Through repeated extractions, most of the active ingredients can be extracted.

[0003] In existing technologies, the operation of extraction tanks often requires long-term manual observation of changes in color, pH value, and temperature, and adjustment of material flow rate based on these changes. This method is not only limited by the experience of operators and has a large human error, but also requires long-term manual monitoring, resulting in low work efficiency, high labor intensity, and hindering the standardization, automation, and intelligent development of enterprises.

[0004] Application content

[0005] This application provides an integrated extraction system and its control method to solve the problem in the prior art that requires long-term manual observation of changes in color, pH value, and temperature, and adjustment of material flow rate based on these changes. This application can improve the automation level of the extraction tank, reduce human interference, and improve the stability of the production line.

[0006] To achieve the above objectives, embodiments of this application provide an integrated extraction system. The integrated extraction system includes at least an extraction tank and a controller. The extraction tank is equipped with at least a first speed reducer for adjusting the stirring of a stirrer and a second speed reducer for adjusting the vertical movement of an aqueous phase regulating pipe. The stirrer is located in the mixing tank of the extraction tank, and the aqueous phase regulating pipe is located in the clarification tank of the extraction tank. The controller is configured to:

[0007] The feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the stirrer are obtained.

[0008] The feed flow rate, the solution information, and the stirring frequency are controlled by PID control of the feed flow rate, the stirring frequency, and the position of the aqueous phase regulating pipe.

[0009] As an improvement to the above scheme, the solution information includes at least: aqueous phase metal concentration, aqueous phase pH value, aqueous phase color, oil phase color, aqueous phase level, oil phase level, total liquid level, and solution temperature.

[0010] As an improvement to the above solution, the water phase regulating pipe and the second reducer are connected by a worm gear structure. By adjusting the number of rotations of the second reducer, the water phase regulating pipe is driven to move up and down in the clarification tank.

[0011] As an improvement to the above solution, the integrated extraction system includes a saponification section, an extraction section, a washing section and a back-extraction section connected in series, wherein each of the saponification section, the extraction section, the washing section and the back-extraction section includes one or more extraction tanks connected in series.

[0012] The controller is also configured to:

[0013] For any of the extraction tanks, PID control is performed on the feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the agitator, as well as the position of the aqueous phase regulating pipe of the extraction tank, the stirring frequency of the agitator of the next extraction tank connected in series with the extraction tank, and the position of the aqueous phase regulating pipe of the next extraction tank connected in series with the extraction tank, based on the feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the agitator of the extraction tank.

[0014] As an improvement to the above solution, the controller is further configured to:

[0015] Obtain fitting variation graphs, which include: fitting variation graphs of metal concentration in raffinate with pH value, fitting variation graphs of metal concentration in back-extraction solution with pH value, fitting variation graphs of metal concentration in raffinate solution with color of aqueous or oil phase, fitting variation graphs of metal concentration in back-extraction solution with color of aqueous or oil phase, fitting variation graphs of separation coefficient with average temperature, and fitting variation graphs of backwash ratio with separation coefficient.

[0016] The optimal control conditions are selected from the fitted variation graph, and the stirring frequency and the position of the aqueous phase regulating pipe are controlled according to the optimal control conditions.

[0017] As an improvement to the above solution, the controller is further configured to perform at least one of the following adjustment operations: safety production adjustment operation, quality adjustment operation, process optimization adjustment operation, and early warning adjustment operation.

[0018] The safety production adjustment operation includes: for any extraction tank, adjusting the stirring frequency of the agitator of the extraction tank according to the total liquid level of the solution in the clarification tank of the extraction tank;

[0019] The quality adjustment operation includes: for any extraction tank, adjusting the feed flow rate of the feed pump connected to the extraction tank according to the metal concentration of the solution in the clarification tank of the extraction tank;

[0020] The process optimization and adjustment operations include: adjusting the feed flow rate of the liquid alkali feed pump or the fore-liquid feed pump according to the saponification rate, and adjusting the feed flow rate of the acid washing feed pump according to the backwash ratio.

[0021] The operation of the early warning adjustment unit includes adjusting the feed flow rate of the liquid alkali feed pump, the fore-liquid feed pump, or the acid washing feed pump according to the color of the aqueous phase, the color of the oil phase, and the pH value of the aqueous phase.

[0022] As an improvement to the above solution, the controller is further configured to:

[0023] Before performing the first adjustment operation, obtain the second adjustment operation within a preset time period before adjustment; the first adjustment operation is the safety production adjustment operation, the quality adjustment operation, the process optimization adjustment operation, or the early warning adjustment operation;

[0024] When the second adjustment operation is the same as the first adjustment operation, the first adjustment operation is cancelled;

[0025] When the second adjustment operation is the opposite of the first adjustment operation, the adjustment operation to be performed is determined according to the adjustment priority;

[0026] The adjustment priorities, from highest to lowest, are: safety production adjustment, quality adjustment, process optimization adjustment, and early warning adjustment.

[0027] As an improvement to the above scheme, when the second adjustment operation is the opposite of the first adjustment operation, determining the current adjustment operation to be performed based on the adjustment priority includes:

[0028] When the second adjustment operation is the opposite of the first adjustment operation, if the priority of the second adjustment operation is greater than the priority of the first adjustment operation, the first adjustment operation is cancelled; if the priority of the second adjustment operation is less than the priority of the first adjustment operation, the first adjustment operation is executed.

[0029] As an improvement to the above solution, the extraction tank includes: a feeding module, an extraction module, and a detection module;

[0030] The detection end of the detection module is connected to each of the extraction modules and the feeding module, and the data output end of the detection module is connected to the data input end of the controller. The detection module is used to detect the feed flow rate of the extraction tank, the solution information of the clarification tank, the stirring frequency of the stirrer and the position of the aqueous phase regulating pipe, and send the detected information to the controller.

[0031] The controller's control terminal is connected to the controlled terminal of each extraction module and the controlled terminal of the feeding module;

[0032] The feeding module includes a feeding trough and a feeding pump, and the feeding trough is connected to the mixing tank through the feeding pump and a pipeline;

[0033] Each extraction module includes: a mixing tank and a clarification tank, the mixing tank and the clarification tank being connected. The mixing tank is equipped with a stirrer, the stirring frequency of which is adjusted by a first speed reducer. The clarification tank is equipped with an oil phase outlet and a vertically arranged, vertically movable water phase regulating pipe. The water phase regulating pipe is equipped with a water phase inlet and a water phase outlet, the water phase outlet being located above the water phase inlet. The water phase in the clarification tank enters the water phase regulating pipe through the water phase inlet and flows out through the water phase outlet. The vertical movement of the water phase regulating pipe is adjusted by a second speed reducer.

[0034] As an improvement to the above solution, the extraction section further includes a raffinate tank, and the feeding module of the extraction section is a pre-liquid feeding module. The pre-liquid feeding module includes a pre-liquid feeding tank and a pre-liquid feeding pump. The pre-liquid feeding tank is connected to the mixing tank of the extraction tank of the extraction section through the pre-liquid feeding pump and a pipeline. The aqueous phase of the extraction section flows into the raffinate tank.

[0035] The feeding module of the washing section is an acid washing feeding module, which includes an acid washing feeding tank and an acid washing feeding pump. The acid washing feeding tank is connected to the mixing tank of the extraction tank of the washing section through the acid washing feeding pump and the pipeline.

[0036] The back-extraction section also includes a back-extraction liquid tank. The feed module of the back-extraction section is a back-extraction acid feed module. The back-extraction acid feed module includes a back-extraction acid feed tank and a back-extraction acid feed pump. The back-extraction acid feed tank is connected to the mixing tank of the extraction tank of the back-extraction section through the back-extraction acid feed pump and pipeline. The aqueous phase of the back-extraction section flows into the back-extraction liquid tank.

[0037] As an improvement to the above solution, the saponification section further includes a saponification water tank. The feeding module of the saponification section is a liquid alkali feeding module. The liquid alkali feeding module includes a liquid alkali feeding tank and a liquid alkali feeding pump. The liquid alkali feeding tank is connected to the mixing tank of the extraction tank of the saponification section through the liquid alkali feeding pump and the pipeline. The aqueous phase of the saponification section flows into the saponification water tank.

[0038] As an improvement to the above scheme, the back-extraction section is further connected in series with an anti-iron section and a clarification section, and both the anti-iron section and the clarification section include one or more extraction tanks connected in series.

[0039] The antiferric section also includes an antiferric liquid tank. The feeding module of the antiferric section is an antiferric acid feeding module. The antiferric acid feeding module includes an antiferric acid feeding tank and an antiferric acid feeding pump. The antiferric acid feeding tank is connected to the mixing tank of the extraction tank of the antiferric section through the antiferric acid feeding pump and pipeline. The aqueous phase of the antiferric section flows into the antiferric liquid tank.

[0040] To achieve the above objectives, this application also provides a control method for an integrated extraction system. The integrated extraction system includes at least one extraction tank, which is equipped with at least a first speed reducer for adjusting the stirring of a stirrer and a second speed reducer for adjusting the vertical movement of an aqueous phase regulating pipe. The stirrer is located in the mixing tank of the extraction tank, and the aqueous phase regulating pipe is located in the clarification tank of the extraction tank. The control method for the integrated extraction system includes:

[0041] The feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the stirrer are obtained.

[0042] The feed flow rate, the solution information, and the stirring frequency are controlled by PID control of the feed flow rate, the stirring frequency, and the position of the aqueous phase regulating pipe.

[0043] As an improvement to the above scheme, the solution information includes at least: aqueous phase metal concentration, aqueous phase pH value, aqueous phase color, oil phase color, aqueous phase level, oil phase level, total liquid level, and solution temperature.

[0044] As an improvement to the above solution, the water phase regulating pipe and the second reducer are connected by a worm gear structure. By adjusting the number of rotations of the second reducer, the water phase regulating pipe is driven to move up and down in the clarification tank.

[0045] Compared with the prior art, the integrated extraction system and its control method provided in this application embodiment achieve automated control of the extraction tank by using PID control of the feed flow rate of the extraction tank, the solution information of the clarification tank and the stirring frequency of the stirrer, thereby reducing human interference and improving the stability of the production line. Attached Figure Description

[0046] Figure 1 This is a flowchart illustrating the operation of a controller for an integrated extraction system provided in an embodiment of this application.

[0047] Figure 2 This is a structural diagram of an integrated extraction system provided in an embodiment of this application;

[0048] Figure 3 This is another structural diagram of an integrated extraction system provided in an embodiment of this application;

[0049] Figure 4 This is another structural diagram of an integrated extraction system provided in the embodiments of this application.

[0050] Among them, 11 is the detection module; 12 is the feeding module; 13 is the extraction module; 1 is the feeding tank; 2 is the feeding pump; 3 is the first reducer; 4 is the mixing tank; 5 is the clarification tank; and 6 is the second reducer. Detailed Implementation

[0051] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0052] See Figure 1 , Figure 1 This is a flowchart illustrating the operation of a controller for an integrated extraction system provided in this application embodiment. The integrated extraction system includes at least an extraction tank and a controller. The extraction tank is equipped with at least a first speed reducer for adjusting the stirring of a stirrer and a second speed reducer for adjusting the vertical movement of an aqueous phase regulating pipe. The stirrer is located in the mixing tank of the extraction tank, and the aqueous phase regulating pipe is located in the clarification tank of the extraction tank. The controller is configured as follows:

[0053] S1. Obtain the feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the stirrer;

[0054] S2. Based on the feed flow rate, the solution information, and the stirring frequency, perform PID control on the feed flow rate, the stirring frequency, and the position of the aqueous phase regulating pipe.

[0055] In one optional implementation, the solution information includes at least: aqueous phase metal concentration, aqueous phase pH value, aqueous phase color, oil phase color, aqueous phase level, oil phase level, total level, and solution temperature.

[0056] It is understood that the solution information is detected by concentration detection device, pH detection device, colorimetric device, liquid level detection device, flow rate detection device, and temperature detection device;

[0057] The concentration detection device, pH detection device, and colorimetric device confirm the metal concentration in the aqueous or oil phase. The pH detection device and colorimetric device continuously monitor and provide color and solution pH values ​​to the control module. The colorimetric device, through color differences, can measure the height of the aqueous and oil phases in the clarification tank and provide the data to the control module. The concentration detection device confirms the metal concentration through intermittent detection.

[0058] The concentration detection device includes an online titration analysis device and an online element concentration detection device. The online titration analysis device is used to intermittently titrate the acidity of blank organic and saponified organic. The online element concentration detection device is used to intermittently measure the concentration of target elements, such as Ni, Co, Mn, Ca, Mg, Zn, Li, Na, etc. The acidity and concentration data are provided to the control module, which then adjusts the material flow rate.

[0059] The color measuring device includes a non-contact or contact online spectrophotometer, which measures the height and color of the oil phase and the water phase and provides the data to the control module.

[0060] The liquid level detection device can be a radar level gauge. The liquid level detection device, temperature detection device, and flow detection device respectively detect the liquid level in the clarification tank, the feed temperature of all solutions, the temperature of each stage in the extraction tank, and the feed flow rate of all solutions, and provide the data to the control module.

[0061] In one alternative embodiment, the water phase regulating pipe and the second reducer are connected by a worm gear structure. By adjusting the number of rotations of the second reducer, the water phase regulating pipe is driven to move up and down within the clarification tank.

[0062] In one optional embodiment, the integrated extraction system includes a saponification section, an extraction section, a washing section, and a back-extraction section connected in series, wherein each of the saponification section, the extraction section, the washing section, and the back-extraction section includes one or more extraction tanks connected in series.

[0063] The controller is also configured to:

[0064] For any of the extraction tanks, PID control is performed on the feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the agitator, as well as the position of the aqueous phase regulating pipe of the extraction tank, the stirring frequency of the agitator of the next extraction tank connected in series with the extraction tank, and the position of the aqueous phase regulating pipe of the next extraction tank connected in series with the extraction tank, based on the feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the agitator of the extraction tank.

[0065] In an alternative implementation, the controller is further configured to:

[0066] Obtain fitting variation graphs, which include: fitting variation graphs of metal concentration in raffinate with pH value, fitting variation graphs of metal concentration in back-extraction solution with pH value, fitting variation graphs of metal concentration in raffinate solution with color of aqueous or oil phase, fitting variation graphs of metal concentration in back-extraction solution with color of aqueous or oil phase, fitting variation graphs of separation coefficient with average temperature, and fitting variation graphs of backwash ratio with separation coefficient.

[0067] The optimal control conditions are selected from the fitted variation graph, and the stirring frequency and the position of the aqueous phase regulating pipe are controlled according to the optimal control conditions.

[0068] In one optional implementation, the controller is further configured to perform at least one of the following adjustment operations: safety production adjustment operation, quality adjustment operation, process optimization adjustment operation, and early warning adjustment operation.

[0069] The safety production adjustment operation includes: for any extraction tank, adjusting the stirring frequency of the agitator of the extraction tank according to the total liquid level of the solution in the clarification tank of the extraction tank;

[0070] The quality adjustment operation includes: for any extraction tank, adjusting the feed flow rate of the feed pump connected to the extraction tank according to the metal concentration of the solution in the clarification tank of the extraction tank;

[0071] The process optimization and adjustment operations include: adjusting the feed flow rate of the liquid alkali feed pump or the fore-liquid feed pump according to the saponification rate, and adjusting the feed flow rate of the acid washing feed pump according to the backwash ratio.

[0072] The operation of the early warning adjustment unit includes adjusting the feed flow rate of the liquid alkali feed pump, the fore-liquid feed pump, or the acid washing feed pump according to the color of the aqueous phase, the color of the oil phase, and the pH value of the aqueous phase.

[0073] In an alternative implementation, the controller is further configured to:

[0074] Before performing the first adjustment operation, obtain the second adjustment operation within a preset time period before adjustment; the first adjustment operation is the safety production adjustment operation, the quality adjustment operation, the process optimization adjustment operation, or the early warning adjustment operation;

[0075] When the second adjustment operation is the same as the first adjustment operation, the first adjustment operation is cancelled;

[0076] When the second adjustment operation is the opposite of the first adjustment operation, the adjustment operation to be performed is determined according to the adjustment priority;

[0077] The adjustment priorities, from highest to lowest, are: safety production adjustment, quality adjustment, process optimization adjustment, and early warning adjustment.

[0078] It is understood that the aforementioned safety production adjustment operations are priority adjustments made based on safety control parameters to ensure safe and stable production. This includes adjusting the frequency of the next lower level when the total liquid level exceeds the control range; if the frequency has reached the upper limit, or if two or more high liquid level alarms occur, proportionally reducing the flow rates of the fore-liquid and organic components. When the temperature exceeds the control range, proportionally reducing the flow rates of the fore-liquid and organic components. When the saponification rate exceeds the control range, increasing the circulating organic flow rate; if the organic flow rate reaches the upper limit, reducing the liquid alkali flow rate. When the oil or water level exceeds the control range, raising or lowering the aqueous phase adjustment lever.

[0079] The quality adjustment operation is the second priority adjustment part, which is adjusted according to product requirements, including adjusting the flow rates of the fore-liquid, organic, acid, and alkali based on the metal content of the raffinate and back-extraction solution.

[0080] The process optimization and adjustment operations refer to system adjustment. To ensure production costs, adjustments are made according to the process optimization control parameters. These include increasing the circulating organic flow rate when the saponification rate exceeds the control range, and decreasing the liquid alkali flow rate if the organic flow rate reaches the upper limit. Adjusting the acid washing flow rate to decrease or increase when the backwash ratio exceeds or falls below the control range. Adjusting the aqueous phase regulating lever to increase or decrease when the oil or water level exceeds the control range.

[0081] The early warning adjustment operation is based on adjustments made according to early warning control parameters, including increasing or decreasing the flow rate of the pre-liquid or acid / alkali solution in advance when there are changes in color or pH. The priority adjustment order for early warning is: colorimeter, then pH meter.

[0082] In one optional implementation, when the second adjustment operation is the opposite of the first adjustment operation, determining the current adjustment operation to be performed based on the adjustment priority includes:

[0083] When the second adjustment operation is the opposite of the first adjustment operation, if the priority of the second adjustment operation is greater than the priority of the first adjustment operation, the first adjustment operation is cancelled; if the priority of the second adjustment operation is less than the priority of the first adjustment operation, the first adjustment operation is executed.

[0084] like Figures 2-3 As shown, the extraction tank includes: a feeding module 12, an extraction module 13, and a detection module 11;

[0085] The detection end of the detection module 11 is connected to each of the extraction modules 13 and the feeding module 12. The data output end of the detection module 11 is connected to the data input end of the controller. The detection module 11 is used to detect the feed flow rate of the extraction tank, the solution information of the clarification tank 5, the stirring frequency of the stirrer and the position of the aqueous phase regulating pipe, and send the detected information to the controller.

[0086] The control terminal of the controller is connected to the controlled terminal of each extraction module 13 and the controlled terminal of the feeding module 12;

[0087] The feeding module 12 includes a feeding trough 1 and a feeding pump 2. The feeding trough 1 is connected to the mixing tank 4 through the feeding pump 2 and a pipe.

[0088] Each extraction module 13 includes: a mixing tank 4 and a clarification tank 5, the mixing tank 4 and the clarification tank 5 being connected. The mixing tank 4 is equipped with a stirrer, the stirring frequency of which is adjusted by a first reducer 3. The clarification tank 5 is equipped with an oil phase outlet and a vertically arranged, vertically movable water phase regulating pipe. The water phase regulating pipe is equipped with a water phase inlet and a water phase outlet, the water phase outlet being located above the water phase inlet. The water phase in the clarification tank 5 enters the water phase regulating pipe through the water phase inlet and flows out through the water phase outlet. The vertical movement of the water phase regulating pipe is adjusted by a second reducer 6.

[0089] Understandably, the first reducer 3 controls the rotation of the agitator blades, thereby changing the agitation frequency. The mixing tank 4 is connected to the next-stage clarification tank 5 via a pipe. The agitator in the mixing tank 4 has suction power, and the flow rate in the pipe can be controlled by adjusting the reducer frequency, thus controlling the liquid level in the clarification tank 5. The water phase regulating pipe is connected to the second reducer 6, and the water phase regulating pipe and the second reducer 6 are connected by a worm gear structure. Adjusting the number of rotations of the second reducer 6 drives the water phase regulating pipe to move up and down, thereby controlling the height of the oil phase and water phase in the clarification tank 5. The controller uses PID control to change the agitator frequency and the position of the water phase regulating pipe, thereby changing the feed flow rate, rotation speed, etc., and controlling parameters such as color, metal concentration, or liquid level within set values.

[0090] In an optional embodiment, the extraction section further includes a raffinate tank, and the feed module of the extraction section is a pre-liquid feed module. The pre-liquid feed module includes a pre-liquid feed tank and a pre-liquid feed pump. The pre-liquid feed tank is connected to the mixing tank of the extraction tank of the extraction section through the pre-liquid feed pump and a pipeline, and the aqueous phase of the extraction section flows into the raffinate tank.

[0091] The feeding module of the washing section is an acid washing feeding module, which includes an acid washing feeding tank and an acid washing feeding pump. The acid washing feeding tank is connected to the mixing tank of the extraction tank of the washing section through the acid washing feeding pump and the pipeline.

[0092] The back-extraction section also includes a back-extraction liquid tank. The feed module of the back-extraction section is a back-extraction acid feed module. The back-extraction acid feed module includes a back-extraction acid feed tank and a back-extraction acid feed pump. The back-extraction acid feed tank is connected to the mixing tank of the extraction tank of the back-extraction section through the back-extraction acid feed pump and pipeline. The aqueous phase of the back-extraction section flows into the back-extraction liquid tank.

[0093] In an optional embodiment, the saponification section further includes a saponification water tank, and the feeding module of the saponification section is a liquid alkali feeding module. The liquid alkali feeding module includes a liquid alkali feeding tank and a liquid alkali feeding pump. The liquid alkali feeding tank is connected to the mixing tank of the extraction tank of the saponification section through the liquid alkali feeding pump and the pipeline. The aqueous phase of the saponification section flows into the saponification water tank.

[0094] In an optional embodiment, the back-extraction section is further connected in series with an anti-iron section and a clarification section, and both the anti-iron section and the clarification section include one or more extraction tanks connected in series.

[0095] The antiferric section also includes an antiferric liquid tank. The feeding module of the antiferric section is an antiferric acid feeding module. The antiferric acid feeding module includes an antiferric acid feeding tank and an antiferric acid feeding pump. The antiferric acid feeding tank is connected to the mixing tank of the extraction tank of the antiferric section through the antiferric acid feeding pump and pipeline. The aqueous phase of the antiferric section flows into the antiferric liquid tank.

[0096] For example, such as Figure 4 As shown, the integrated extraction system provided in this application embodiment includes a saponification section, an extraction section, a washing section, a back-extraction section, an anti-iron section, and a clarification section connected in series. Each stage of the extraction tank includes a saponification stage 1, an extraction stage 4, a washing stage 2, a back-extraction stage 3, an anti-iron stage 2, and a clarification stage 1.

[0097] This application embodiment also provides a control method for an integrated extraction system. The integrated extraction system includes at least one extraction tank. The extraction tank is equipped with at least a first speed reducer for adjusting the stirring of a stirrer and a second speed reducer for adjusting the vertical movement of an aqueous phase regulating pipe. The stirrer is located in the mixing tank of the extraction tank, and the aqueous phase regulating pipe is located in the clarification tank of the extraction tank. The control method for the integrated extraction system includes:

[0098] The feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the stirrer are obtained.

[0099] The feed flow rate, the solution information, and the stirring frequency are controlled by PID control of the feed flow rate, the stirring frequency, and the position of the aqueous phase regulating pipe.

[0100] Optionally, the solution information includes at least: aqueous phase metal concentration, aqueous phase pH value, aqueous phase color, oil phase color, aqueous phase level, oil phase level, total liquid level, and solution temperature.

[0101] Optionally, the water phase regulating pipe and the second reducer are connected by a worm gear structure, and the water phase regulating pipe is moved up and down in the clarification tank by adjusting the number of rotations of the second reducer.

[0102] Optionally, the integrated extraction system includes a saponification section, an extraction section, a washing section, and a back-extraction section connected in series, wherein each of the saponification section, the extraction section, the washing section, and the back-extraction section includes one or more extraction tanks connected in series.

[0103] The control method for the integrated extraction system also includes:

[0104] For any of the extraction tanks, PID control is performed on the feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the agitator, as well as the position of the aqueous phase regulating pipe of the extraction tank, the stirring frequency of the agitator of the next extraction tank connected in series with the extraction tank, and the position of the aqueous phase regulating pipe of the next extraction tank connected in series with the extraction tank, based on the feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the agitator of the extraction tank.

[0105] Optionally, the control method for the integrated extraction system further includes:

[0106] Obtain fitting variation graphs, which include: fitting variation graphs of metal concentration in raffinate with pH value, fitting variation graphs of metal concentration in back-extraction solution with pH value, fitting variation graphs of metal concentration in raffinate solution with color of aqueous or oil phase, fitting variation graphs of metal concentration in back-extraction solution with color of aqueous or oil phase, fitting variation graphs of separation coefficient with average temperature, and fitting variation graphs of backwash ratio with separation coefficient.

[0107] The optimal control conditions are selected from the fitted variation graph, and the stirring frequency and the position of the aqueous phase regulating pipe are controlled according to the optimal control conditions.

[0108] Optionally, the control method of the integrated extraction system further includes: performing at least one of the following adjustment operations: safety production adjustment operation, quality adjustment operation, process optimization adjustment operation, and early warning adjustment operation;

[0109] The safety production adjustment operation includes: for any extraction tank, adjusting the stirring frequency of the agitator of the extraction tank according to the total liquid level of the solution in the clarification tank of the extraction tank;

[0110] The quality adjustment operation includes: for any extraction tank, adjusting the feed flow rate of the feed pump connected to the extraction tank according to the metal concentration of the solution in the clarification tank of the extraction tank;

[0111] The process optimization and adjustment operations include: adjusting the feed flow rate of the liquid alkali feed pump or the fore-liquid feed pump according to the saponification rate, and adjusting the feed flow rate of the acid washing feed pump according to the backwash ratio.

[0112] The operation of the early warning adjustment unit includes adjusting the feed flow rate of the liquid alkali feed pump, the fore-liquid feed pump, or the acid washing feed pump according to the color of the aqueous phase, the color of the oil phase, and the pH value of the aqueous phase.

[0113] Optionally, the control method for the integrated extraction system further includes:

[0114] Before performing the first adjustment operation, obtain the second adjustment operation within a preset time period before adjustment; the first adjustment operation is the safety production adjustment operation, the quality adjustment operation, the process optimization adjustment operation, or the early warning adjustment operation;

[0115] When the second adjustment operation is the same as the first adjustment operation, the first adjustment operation is cancelled;

[0116] When the second adjustment operation is the opposite of the first adjustment operation, the adjustment operation to be performed is determined according to the adjustment priority;

[0117] The adjustment priorities, from highest to lowest, are: safety production adjustment, quality adjustment, process optimization adjustment, and early warning adjustment.

[0118] Optionally, when the second adjustment operation is the opposite of the first adjustment operation, determining the current adjustment operation to be performed based on the adjustment priority includes:

[0119] When the second adjustment operation is the opposite of the first adjustment operation, if the priority of the second adjustment operation is greater than the priority of the first adjustment operation, the first adjustment operation is cancelled; if the priority of the second adjustment operation is less than the priority of the first adjustment operation, the first adjustment operation is executed.

[0120] Optionally, the extraction tank includes: a feeding module, an extraction module, and a detection module;

[0121] The detection end of the detection module is connected to each of the extraction modules and the feeding module, and the data output end of the detection module is connected to the data input end of the controller of the integrated extraction system. The detection module is used to detect the feed flow rate of the extraction tank, the solution information of the clarification tank, the stirring frequency of the stirrer and the position of the aqueous phase regulating pipe, and send the detected information to the controller.

[0122] The controller's control terminal is connected to the controlled terminal of each extraction module and the controlled terminal of the feeding module;

[0123] The feeding module includes a feeding trough and a feeding pump, and the feeding trough is connected to the mixing tank through the feeding pump and a pipeline;

[0124] Each extraction module includes: a mixing tank and a clarification tank, the mixing tank and the clarification tank being connected. The mixing tank is equipped with a stirrer, the stirring frequency of which is adjusted by a first speed reducer. The clarification tank is equipped with an oil phase outlet and a vertically arranged, vertically movable water phase regulating pipe. The water phase regulating pipe is equipped with a water phase inlet and a water phase outlet, the water phase outlet being located above the water phase inlet. The water phase in the clarification tank enters the water phase regulating pipe through the water phase inlet and flows out through the water phase outlet. The vertical movement of the water phase regulating pipe is adjusted by a second speed reducer.

[0125] Optionally, the extraction section further includes a raffinate tank, and the feeding module of the extraction section is a pre-liquid feeding module. The pre-liquid feeding module includes a pre-liquid feeding tank and a pre-liquid feeding pump. The pre-liquid feeding tank is connected to the mixing tank of the extraction tank of the extraction section through the pre-liquid feeding pump and a pipeline. The aqueous phase of the extraction section flows into the raffinate tank.

[0126] The feeding module of the washing section is an acid washing feeding module, which includes an acid washing feeding tank and an acid washing feeding pump. The acid washing feeding tank is connected to the mixing tank of the extraction tank of the washing section through the acid washing feeding pump and the pipeline.

[0127] The back-extraction section also includes a back-extraction liquid tank. The feed module of the back-extraction section is a back-extraction acid feed module. The back-extraction acid feed module includes a back-extraction acid feed tank and a back-extraction acid feed pump. The back-extraction acid feed tank is connected to the mixing tank of the extraction tank of the back-extraction section through the back-extraction acid feed pump and pipeline. The aqueous phase of the back-extraction section flows into the back-extraction liquid tank.

[0128] Optionally, the saponification section further includes a saponification water tank, and the feeding module of the saponification section is a liquid alkali feeding module. The liquid alkali feeding module includes a liquid alkali feeding tank and a liquid alkali feeding pump. The liquid alkali feeding tank is connected to the mixing tank of the extraction tank of the saponification section through the liquid alkali feeding pump and the pipeline. The aqueous phase of the saponification section flows into the saponification water tank.

[0129] Optionally, the back-extraction section is further connected in series with an anti-iron section and a clarification section, and each of the anti-iron section and the clarification section includes one or more extraction tanks connected in series.

[0130] The antiferric section also includes an antiferric liquid tank. The feeding module of the antiferric section is an antiferric acid feeding module. The antiferric acid feeding module includes an antiferric acid feeding tank and an antiferric acid feeding pump. The antiferric acid feeding tank is connected to the mixing tank of the extraction tank of the antiferric section through the antiferric acid feeding pump and pipeline. The aqueous phase of the antiferric section flows into the antiferric liquid tank.

[0131] Compared with the prior art, the integrated extraction system and its control method provided in this application have the following advantages:

[0132] 1. Reduces human interference, automatically fits and adjusts data based on detection data, optimizes production line process parameters, effectively improves product quality, increases production capacity, and reduces auxiliary material costs.

[0133] 2. Use concentration detection devices, pH detection devices, colorimetric devices, liquid level detection devices, flow detection devices, and temperature detection devices to detect various parameters of the extraction tank, reducing the intensity of manual monitoring and lowering labor costs.

[0134] 3. High work efficiency, easy management, and improved enterprise production efficiency.

[0135] 4. Reducing the harm of extractants to workers helps reduce safety hazards in enterprises and lowers the incidence of occupational diseases.

[0136] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.

Claims

1. An integrated extraction system, characterized in that, The integrated extraction system includes at least one extraction tank and a controller. The extraction tank is equipped with at least a first speed reducer for adjusting the stirring of a stirrer and a second speed reducer for adjusting the vertical movement of an aqueous phase regulating pipe. The stirrer is located in the mixing tank of the extraction tank, and the aqueous phase regulating pipe is located in the clarification tank of the extraction tank. The controller is configured as follows: The feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the stirrer are obtained. The feed flow rate, the solution information, and the stirring frequency are controlled by PID control of the feed flow rate, the stirring frequency, and the position of the aqueous phase regulating pipe.

2. The integrated extraction system as described in claim 1, characterized in that, The solution information includes at least: aqueous phase metal concentration, aqueous phase pH value, aqueous phase color, oil phase color, aqueous phase level, oil phase level, total liquid level, and solution temperature.

3. The integrated extraction system as described in claim 1, characterized in that, The water phase regulating pipe and the second reducer are connected by a worm gear structure. By adjusting the number of rotations of the second reducer, the water phase regulating pipe is driven to move up and down in the clarification tank.

4. The integrated extraction system as described in claim 1, characterized in that, The integrated extraction system includes a saponification section, an extraction section, a washing section, and a back-extraction section connected in series. Each of the saponification section, the extraction section, the washing section, and the back-extraction section includes one or more extraction tanks connected in series. The controller is also configured to: For any of the extraction tanks, PID control is performed on the feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the agitator, as well as the position of the aqueous phase regulating pipe of the extraction tank, the stirring frequency of the agitator of the next extraction tank connected in series with the extraction tank, and the position of the aqueous phase regulating pipe of the next extraction tank connected in series with the extraction tank, based on the feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the agitator of the extraction tank.

5. The integrated extraction system as described in claim 4, characterized in that, The controller is also configured to: Obtain fitting variation graphs, which include: fitting variation graphs of metal concentration in raffinate with pH value, fitting variation graphs of metal concentration in back-extraction solution with pH value, fitting variation graphs of metal concentration in raffinate solution with color of aqueous or oil phase, fitting variation graphs of metal concentration in back-extraction solution with color of aqueous or oil phase, fitting variation graphs of separation coefficient with average temperature, and fitting variation graphs of backwash ratio with separation coefficient. The optimal control conditions are selected from the fitted variation graph, and the stirring frequency and the position of the aqueous phase regulating pipe are controlled according to the optimal control conditions.

6. The integrated extraction system as described in claim 4, characterized in that, The controller is also configured to perform at least one of the following adjustment operations: safety production adjustment operation, quality adjustment operation, process optimization adjustment operation, and early warning adjustment operation. The safety production adjustment operation includes: for any extraction tank, adjusting the stirring frequency of the agitator of the extraction tank according to the total liquid level of the solution in the clarification tank of the extraction tank; The quality adjustment operation includes: for any extraction tank, adjusting the feed flow rate of the feed pump connected to the extraction tank according to the metal concentration of the solution in the clarification tank of the extraction tank; The process optimization and adjustment operations include: adjusting the feed flow rate of the liquid alkali feed pump or the fore-liquid feed pump according to the saponification rate, and adjusting the feed flow rate of the acid washing feed pump according to the backwash ratio. The operation of the early warning adjustment unit includes adjusting the feed flow rate of the liquid alkali feed pump, the fore-liquid feed pump, or the acid washing feed pump according to the color of the aqueous phase, the color of the oil phase, and the pH value of the aqueous phase.

7. The integrated extraction system as described in claim 6, characterized in that, The controller is also configured to: Before performing the first adjustment operation, obtain the second adjustment operation within a preset time period before adjustment; the first adjustment operation is the safety production adjustment operation, the quality adjustment operation, the process optimization adjustment operation, or the early warning adjustment operation; When the second adjustment operation is the same as the first adjustment operation, the first adjustment operation is cancelled; When the second adjustment operation is the opposite of the first adjustment operation, the adjustment operation to be performed is determined according to the adjustment priority; The adjustment priorities, from highest to lowest, are: safety production adjustment, quality adjustment, process optimization adjustment, and early warning adjustment.

8. The integrated extraction system as described in claim 7, characterized in that, When the second adjustment operation is the opposite of the first adjustment operation, the adjustment operation to be performed is determined according to the adjustment priority, including: When the second adjustment operation is the opposite of the first adjustment operation, if the priority of the second adjustment operation is greater than the priority of the first adjustment operation, the first adjustment operation is cancelled; if the priority of the second adjustment operation is less than the priority of the first adjustment operation, the first adjustment operation is executed.

9. The integrated extraction system as described in claim 1, characterized in that, The extraction tank includes: a feeding module, an extraction module, and a detection module; The detection end of the detection module is connected to each of the extraction modules and the feeding module, and the data output end of the detection module is connected to the data input end of the controller. The detection module is used to detect the feed flow rate of the extraction tank, the solution information of the clarification tank, the stirring frequency of the stirrer and the position of the aqueous phase regulating pipe, and send the detected information to the controller. The controller's control terminal is connected to the controlled terminal of each extraction module and the controlled terminal of the feeding module; The feeding module includes a feeding trough and a feeding pump, and the feeding trough is connected to the mixing tank through the feeding pump and a pipeline; Each extraction module includes: a mixing tank and a clarification tank, the mixing tank and the clarification tank being connected. The mixing tank is equipped with a stirrer, the stirring frequency of which is adjusted by a first speed reducer. The clarification tank is equipped with an oil phase outlet and a vertically arranged, vertically movable water phase regulating pipe. The water phase regulating pipe is equipped with a water phase inlet and a water phase outlet, the water phase outlet being located above the water phase inlet. The water phase in the clarification tank enters the water phase regulating pipe through the water phase inlet and flows out through the water phase outlet. The vertical movement of the water phase regulating pipe is adjusted by a second speed reducer.

10. The integrated extraction system as described in claim 4, characterized in that, The extraction section also includes a raffinate tank. The feed module of the extraction section is a pre-liquid feed module. The pre-liquid feed module includes a pre-liquid feed tank and a pre-liquid feed pump. The pre-liquid feed tank is connected to the mixing tank of the extraction tank of the extraction section through the pre-liquid feed pump and a pipeline. The aqueous phase of the extraction section flows into the raffinate tank. The feeding module of the washing section is an acid washing feeding module, which includes an acid washing feeding tank and an acid washing feeding pump. The acid washing feeding tank is connected to the mixing tank of the extraction tank of the washing section through the acid washing feeding pump and the pipeline. The back-extraction section also includes a back-extraction liquid tank. The feed module of the back-extraction section is a back-extraction acid feed module. The back-extraction acid feed module includes a back-extraction acid feed tank and a back-extraction acid feed pump. The back-extraction acid feed tank is connected to the mixing tank of the extraction tank of the back-extraction section through the back-extraction acid feed pump and pipeline. The aqueous phase of the back-extraction section flows into the back-extraction liquid tank.

11. The integrated extraction system as described in claim 10, characterized in that, The saponification section also includes a saponification water tank. The feeding module of the saponification section is a liquid alkali feeding module. The liquid alkali feeding module includes a liquid alkali feeding tank and a liquid alkali feeding pump. The liquid alkali feeding tank is connected to the mixing tank of the extraction tank of the saponification section through the liquid alkali feeding pump and the pipeline. The aqueous phase of the saponification section flows into the saponification water tank.

12. The integrated extraction system as described in claim 11, characterized in that, The back-extraction section is further connected in series with an anti-iron section and a clarification section, and each of the anti-iron section and the clarification section includes one or more extraction tanks connected in series. The antiferric section also includes an antiferric liquid tank. The feeding module of the antiferric section is an antiferric acid feeding module. The antiferric acid feeding module includes an antiferric acid feeding tank and an antiferric acid feeding pump. The antiferric acid feeding tank is connected to the mixing tank of the extraction tank of the antiferric section through the antiferric acid feeding pump and pipeline. The aqueous phase of the antiferric section flows into the antiferric liquid tank.

13. A control method for an integrated extraction system, characterized in that, The integrated extraction system includes at least one extraction tank, which is equipped with at least a first speed reducer for adjusting the stirring of a stirrer and a second speed reducer for adjusting the vertical movement of an aqueous phase regulating pipe. The stirrer is located in the mixing tank of the extraction tank, and the aqueous phase regulating pipe is located in the clarification tank of the extraction tank. The control method of the integrated extraction system includes: The feed flow rate of the extraction tank, the solution information of the clarification tank, and the stirring frequency of the stirrer are obtained. The feed flow rate, the solution information, and the stirring frequency are controlled by PID control of the feed flow rate, the stirring frequency, and the position of the aqueous phase regulating pipe.

14. The control method for the integrated extraction system as described in claim 13, characterized in that, The solution information includes at least: aqueous phase metal concentration, aqueous phase pH value, aqueous phase color, oil phase color, aqueous phase level, oil phase level, total liquid level, and solution temperature.

15. The control method for the integrated extraction system as described in claim 13, characterized in that, The water phase regulating pipe and the second reducer are connected by a worm gear structure. By adjusting the number of rotations of the second reducer, the water phase regulating pipe is driven to move up and down in the clarification tank.

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