An acid addition system and acid addition control method for in-situ leaching mining

Abstract

This application discloses an acid addition system and acid addition control method for in-situ leaching mining. It relates to the field of uranium hydrometallurgy and intelligent mining technology, and includes: a control platform for acquiring the real-time injection volume and injection pressure of each injection well, and the real-time extraction volume and uranium concentration of the pumping well associated with each injection well; calculating the acid addition concentration and acid demand of each injection well based on the real-time injection volume, injection pressure, real-time extraction volume, and uranium concentration; generating acid addition instructions for each injection well based on the acid addition concentration and acid demand; and acid addition execution units distributed at the wellheads of each injection well for receiving the acid addition instructions sent by the control platform and executing acid addition operations on each injection well according to the acid addition concentration and acid demand carried in the acid addition instructions. This application can adaptively adjust the acid addition strategy of each injection well, thereby reducing acid consumption and improving resource recovery rate.

Description

Technical Field

[0001] This application relates to the fields of hydrometallurgy and intelligent mining technology for uranium ore, and in particular to an acid addition system and acid addition control method for in-situ leaching mining. Background Technology

[0002] Acid leaching is the mainstream in-situ leaching process for uranium mining in sandstone-type uranium deposits. It uses sulfuric acid as the core leaching agent, combined with an oxidant injected into the underground ore-bearing layer, to selectively dissolve uranium and then pump it to the surface for recovery. It has advantages such as high efficiency and low cost.

[0003] Currently, traditional acid leaching processes for uranium mining typically employ a static acid addition strategy, meaning all wells use the same strategy with a constant acid concentration. However, this static strategy is ill-suited to the variations in ore layers caused by increased heterogeneity and chemical precipitation during mining. In high-permeability wells, this can lead to premature acid peaks and acid surges, resulting in acid waste and environmental contamination. In low-permeability wells, it can cause slow leaching, leading to lower resource recovery rates. Summary of the Invention

[0004] In view of this, this application provides an acid addition system and acid addition control method for in-situ leaching mining, which mainly enables adaptive adjustment of the acid addition strategy of each injection well, thereby reducing acid consumption and improving resource recovery rate.

[0005] According to a first aspect of this application, an acid addition system for in-situ leaching mining is provided. The system includes: a control platform for acquiring real-time injection volume and injection pressure of each injection well, and real-time extraction volume and uranium concentration of each pumping well associated with the injection well; calculating the acid addition concentration and acid demand of each injection well based on the real-time injection volume, the injection pressure, the real-time extraction volume, and the uranium concentration; and generating acid addition instructions for each injection well based on the acid addition concentration and acid demand of each injection well.

[0006] The acid addition execution units distributed at the wellheads of each injection well are used to receive the acid addition command sent by the control platform, and perform acid addition operation to each injection well according to the acid concentration and acid demand carried in the acid addition command.

[0007] Optionally, the acid addition execution unit includes: a concentrated sulfuric acid metering module, a mixing and heat dissipation module, and an edge control module;

[0008] The edge control module is used to receive the acid addition command sent by the control platform, and control the concentrated sulfuric acid metering module to perform concentrated sulfuric acid metering operation according to the acid concentration and acid demand carried in the acid addition command.

[0009] The mixed heat dissipation module is used to receive concentrated sulfuric acid after it has been metered by the concentrated sulfuric acid metering module, and to mix, dilute and dissipate the metered concentrated sulfuric acid to output an acidic mixture that meets the acid concentration, and to add the acidic mixture to the corresponding injection well.

[0010] Optionally, the concentrated sulfuric acid metering module includes: a concentrated acid storage tank, an acid addition branch pipe, a metering pump, and a flow meter; the acid addition branch pipe is connected to the outlet of the concentrated acid storage tank and the mixing and heat dissipation module respectively, and the metering pump and the flow meter are installed on the acid addition branch pipe.

[0011] Optionally, the hybrid heat dissipation module includes a premixer, a buffer heat dissipation tank, and a static mixer;

[0012] The inlet of the premixer is connected to the concentrated sulfuric acid metering module and the main water flow pipeline respectively. The premixer is used to draw in the metered concentrated sulfuric acid when the main water flow passes through, and to perform preliminary mixing and dilution with the main water flow to obtain a preliminary mixture.

[0013] The inlet of the buffer cooling tank is connected to the outlet of the premixer, and the outlet of the buffer cooling tank is connected to the inlet of the static mixer. The tank body of the buffer cooling tank is wound with a coil, and the coil is connected to the cooling water inlet pipe. The buffer cooling tank is used to dissipate heat from the preliminary mixture through the cooling water in the coil to obtain a cooled mixture.

[0014] The inlet of the static mixer is connected to the cooling water outlet pipe, the cooling water outlet pipe is connected to the coil, and the outlet of the static mixer is connected to the injection main pipe. The static mixer is used to uniformly mix the heat-dissipated mixture with the cooling water flowing through the coil to obtain an acidic mixture that meets the acid concentration, and then add the acidic mixture that meets the acid concentration to the corresponding injection well through the injection main pipe.

[0015] Optionally, the injection main pipe is equipped with a variety of sensors, and the edge control module is also used to send the collected signals from the various sensors to the control platform.

[0016] According to a second aspect of this application, an acid addition control method for in-situ leaching mining is provided, applied to a control platform in the aforementioned acid addition system, the method comprising:

[0017] The real-time injection volume and injection pressure of each injection well, as well as the real-time pumping volume and uranium concentration of the pumping wells associated with each injection well, are obtained.

[0018] Based on the real-time extraction volume and the uranium concentration, calculate the instantaneous leaching recovery rate of each injection well within its effective control area;

[0019] The leaching rate of each injection well in the next cycle, predicted based on the current acid addition strategy, is used as an unknown variable. Combined with the instantaneous leaching rate, a leaching rate equilibrium optimization function is constructed.

[0020] Based on the real-time injection volume and the injection pressure, respectively construct constraints on the acid concentration and acid demand for the unknown variables;

[0021] Based on the acid concentration constraint and the acid demand constraint, the leaching rate equilibrium optimization function is solved to obtain the acid concentration and acid demand of each injection well.

[0022] Based on the acid concentration and acid demand of each injection well, an acid addition command is generated and sent to each injection well.

[0023] According to a third aspect of this application, an acid control device for in-situ leaching mining is provided, the device comprising:

[0024] The acquisition unit is used to acquire the real-time injection volume and injection pressure of each injection well, as well as the real-time extraction volume and uranium concentration of the pumping well associated with each injection well.

[0025] The calculation unit is used to calculate the instantaneous leaching rate of each injection well within its effective control area based on the real-time pumping volume and the uranium concentration.

[0026] The construction unit is used to construct an leaching rate equilibrium optimization function by taking the leaching rate of each injection well in the next cycle predicted based on the current acid addition strategy as an unknown variable and combining it with the instantaneous leaching rate.

[0027] The construction unit is also used to construct acid concentration constraints and acid demand constraints for the unknown variables based on the real-time injection volume and the injection pressure, respectively.

[0028] The solution unit is used to solve the leaching rate equilibrium optimization function based on the acid concentration constraint and the acid demand constraint to obtain the acid concentration and acid demand of each injection well.

[0029] The generation unit is used to generate and send acid addition instructions for each injection well based on the acid concentration and acid demand of each injection well.

[0030] According to a fourth aspect of this application, a storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the above-described acid control method for in-situ leaching mining.

[0031] According to a fifth aspect of this application, an electronic device is provided, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, wherein the processor executes the program to implement the above-described acid control method for in-situ leaching mining.

[0032] By means of the above technical solution, the acid addition system and acid addition control method provided in this application for in-situ leaching mining, compared with the prior art, can adaptively adjust the acid addition strategy of each injection well according to the real-time injection volume and injection pressure of each injection well, as well as the real-time extraction volume and uranium concentration of the extraction wells related to each injection well. This dynamic acid addition strategy of this application can adapt to the differences in the ore layers of each well caused by the intensification of heterogeneity and blockage during the mining process. Under the premise of ensuring pipeline safety, it can actively balance and accelerate the leaching process of each injection well, thereby reducing acid consumption and improving resource recovery rate.

[0033] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0035] Figure 1 This invention provides a schematic diagram of the structure of an acid addition system for in-situ leaching mining according to an embodiment of this application.

[0036] Figure 2 A schematic diagram of the structure of the acid addition execution unit provided in an embodiment of this application is shown;

[0037] Figure 3 This paper shows a schematic diagram of the overall architecture of the acid addition system provided in an embodiment of this application;

[0038] Figure 4 A schematic diagram of the structure of the hybrid heat dissipation module provided in an embodiment of this application is shown;

[0039] Figure 5 A schematic diagram of the execution flow of the hybrid heat dissipation module provided in an embodiment of this application is shown;

[0040] Figure 6 A schematic flowchart of an acid control method for in-situ leaching mining provided in an embodiment of this application is shown.

[0041] Figure 7A schematic diagram of an acid addition control device for in-situ leaching mining provided in an embodiment of this application is shown. Detailed Implementation

[0042] The present application will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present application can be combined with each other.

[0043] The existing static acid addition strategy cannot adapt to the differences in the mineral layers caused by increased heterogeneity and blockage during the mining process. For mines in high-permeability zones, acid peaks are easily reached prematurely, resulting in acid surges, acid waste, and pollution of the leaching environment. For mines in low-permeability zones, leaching is slow, leading to low resource recovery rates.

[0044] To address the aforementioned problems, embodiments of the present invention provide an acid addition system for in-situ leaching mining, such as... Figure 1 As shown, the system includes: a control platform 1, used to acquire the real-time injection volume and injection pressure of each injection well 3, and the real-time extraction volume and uranium concentration of each extraction well 4 associated with each injection well 3, and to calculate the acid concentration and acid demand of each injection well based on the real-time injection volume, the injection pressure, the real-time extraction volume and the uranium concentration; to generate acid addition instructions for each injection well based on the acid concentration and acid demand of each injection well; and acid addition execution units 2 distributed at the wellheads of each injection well, used to receive the acid addition instructions sent by the control platform 1, and to perform acid addition operations on each injection well 3 according to the acid concentration and acid demand carried in the acid addition instructions.

[0045] Specifically, a control platform 1 is deployed in the cloud or at the mining area control center, while an acid injection execution unit 2 is deployed at the wellhead of each injection well 3. Each injection well 3 corresponds to one acid injection execution unit 2, and the acid injection execution unit 2 is connected to the control platform 1 via a fiber optic communication network. Numerous sensors are deployed in each injection well 3 and each extraction well 4 to collect real-time injection volume and pressure, as well as real-time extraction volume and uranium concentration from the associated extraction well 4. The real-time operating data collected by the sensors is transmitted to the edge control module in the acid injection execution unit 2. The edge control module then uploads this real-time operating data to the control platform 1. Based on the real-time injection volume and pressure of each injection well 3, and the real-time extraction volume and uranium concentration of the associated extraction well 4, the control platform 1 calculates the current acid concentration and acid demand for each injection well, generates an acid injection command, and sends it to the corresponding acid injection execution unit 2. After receiving the acid addition command, the acid addition execution unit 2 will perform the acid addition operation to the injection well 3 according to the acid concentration and acid demand calculated by the control platform 1.

[0046] In some embodiments, such as Figure 2 As shown, the acid addition execution unit 2 includes: a concentrated sulfuric acid metering module 21, a mixing and heat dissipation module 22, and an edge control module 23; the edge control module 23 is used to receive the acid addition command sent by the control platform 1, and control the concentrated sulfuric acid metering module 21 to perform concentrated sulfuric acid metering operation according to the acid addition concentration and the acid demand carried in the acid addition command; the mixing and heat dissipation module 23 is used to receive the concentrated sulfuric acid after being metered by the concentrated sulfuric acid metering module, and mix, dilute and dissipate the metered concentrated sulfuric acid to output an acidic mixture that meets the acid addition concentration, and add the acidic mixture to the corresponding injection well 3.

[0047] Specifically, the edge control module 23 includes edge controllers deployed at the wellheads of each injection well, such as... Figure 3 As shown, the real-time operating data collected by the sensors will be uploaded to the intelligent control platform (control platform 1) through the edge controller.

[0048] In some embodiments, such as Figure 4 As shown, the concentrated sulfuric acid metering module 22 includes: a concentrated acid storage tank 221, an acid addition branch pipe 224, a metering pump 222, and a flow meter 223; the acid addition branch pipe 224 is connected to the outlet of the concentrated acid storage tank 221 and the mixing and heat dissipation module 23 respectively, and the metering pump 222 and the flow meter 223 are installed on the acid addition branch pipe 224.

[0049] Specifically, the concentrated acid storage tank 221 can be a corrosion-resistant concentrated sulfuric acid storage tank. The metering pump 222 can be a high-precision plunger metering pump with a flow range of 0.1-10 L / h and an accuracy of ±0.5% FS. The flow meter 223 is an acid-resistant Coriolis mass flow meter, mainly used for metering and feedback. The concentrated sulfuric acid metering module 22 can ensure metering accuracy and concentrated acid flowability at extremely low flow rates.

[0050] In some embodiments, such as Figure 4As shown, the mixing and heat dissipation module 23 includes a premixer 231, a buffer heat dissipation tank 232, and a static mixer 233. The inlet of the premixer 231 is connected to the concentrated sulfuric acid metering module 21 and the main water flow pipeline 234, respectively. The premixer 231 is used to draw in the metered concentrated sulfuric acid when the main water flow passes through, and to perform preliminary mixing and dilution with the main water flow to obtain a preliminary mixture. The inlet of the buffer heat dissipation tank 232 is connected to the outlet of the premixer 231, and the outlet of the buffer heat dissipation tank 232 is connected to the inlet of the static mixer 233. The tank body of the buffer heat dissipation tank 232 is wound with a coil 237, and the coil 237 is connected to the cooling water inlet. A water pipe 235 is connected, and the buffer cooling tank 232 is used to dissipate heat from the preliminary mixture through the cooling water in the coil 237 to obtain a cooled mixture. The inlet of the static mixer 233 is connected to the cooling water outlet pipe 235, the cooling water outlet pipe 235 is connected to the coil 237, and the outlet of the static mixer 233 is connected to the injection main pipe 236. The static mixer 233 is used to uniformly mix the cooled mixture with the cooling water flowing through the coil 237 to obtain an acidic mixture that meets the acid concentration, and the acidic mixture that meets the acid concentration is added to the corresponding injection well 3 through the injection main pipe 236.

[0051] The water flow in the cooling water outlet pipe 235 and the main water flow pipe 234 comes from the same single-hole injection (acid-free) pipe, and the liquid flow rate of the cooling water outlet pipe 235 accounts for more than 70%.

[0052] Specifically, the premixer 231 is a first-stage Venturi high-efficiency premixer made of Hastelloy C-276. The first-stage Venturi high-efficiency premixer utilizes the power generated by the high-pressure injection water in the main water flow pipeline 234 to create negative pressure at the throat to draw in the metered concentrated sulfuric acid. The first-stage Venturi high-efficiency premixer achieves the initial vigorous mixing and preliminary dilution of concentrated sulfuric acid and water flow. This design has a mixing efficiency of more than 95% and high reliability.

[0053] In this embodiment of the invention, the concentrated sulfuric acid output by the concentrated sulfuric acid metering module 22 is metered and then injected into the throat of the first-stage Venturi high-efficiency premixer. Utilizing the negative pressure effect generated when the main water flows through at high speed, the concentrated sulfuric acid is drawn in and initially and rapidly mixed and diluted with the water flow, achieving a safe mixing method of "acid into water" and avoiding local overheating.

[0054] Meanwhile, the buffer cooling tank 232 has a vertical barrel-shaped main structure, with the main body made of PPH (homogeneous polypropylene). The tank body is wrapped with stainless steel coils 237 as cooling channels, or adopts a jacketed design. This buffer cooling tank 232 allows the initial mixture sufficient time to release dilution heat, and the heat is continuously carried away by the circulating cooling water (such as the leachate to be added before acid preparation) in the coils 237, thereby solving the impact of instantaneous high temperature on the pipeline.

[0055] In addition, a static mixer 233 is connected between the buffer heat sink 232 and the injection main pipe 236. The static mixer 233 is used to finally agitate and uniformly mix the heat-dissipated mixture with the cooling water, thereby outputting an acidic mixture that meets the acid concentration requirements. The cooling water in the coil 237 has a relatively fast flow rate, so the temperature rise after the buffer heat sink 232 dissipates heat is only 3-5℃, and the overall temperature is below 20℃. The injection main pipe 236 is made of heat-resistant PVDF (which can withstand hot liquid transportation at 120℃).

[0056] In some embodiments, the injection main pipe 236 is equipped with multiple sensors, and the edge control module 21 is further configured to send the acquired signals from the multiple sensors to the control platform. For example... Figure 5 As shown, the acid-resistant pH electrode and electromagnetic flowmeter are installed on the main injection pipe 236, and the PT100 temperature sensor and pressure sensor are installed on the single-hole injection (acid-free) pipeline (e.g. Figure 5 On the pipe below the blue dot, the temperature sensor is located at the outlet of the buffer heat sink 232.

[0057] The present invention provides an acid addition system for in-situ leaching mining that can adaptively adjust the acid addition strategy of each injection well based on the real-time injection volume and pressure of each injection well, as well as the real-time extraction volume and uranium concentration of the pumping well associated with each injection well. This dynamic acid addition strategy of the present invention can adapt to the differences in the ore layers of each well caused by increased heterogeneity and blockage during the mining process. Under the premise of ensuring pipeline safety, it can actively balance and accelerate the leaching process of each injection well, thereby reducing acid consumption and improving resource recovery rate.

[0058] Furthermore, in order to adaptively adjust the acid addition strategy of each injection well, this embodiment of the invention also provides an acid addition control method for in-situ leaching mining, applied to the control platform of the acid addition system, such as... Figure 6 As shown, it includes:

[0059] Step 10: Obtain the real-time injection volume and injection pressure of each injection well, as well as the real-time pumping volume and uranium concentration of the pumping wells associated with each injection well.

[0060] In this embodiment of the invention, each injection well 3 and each extraction well 4 is equipped with a large number of sensors to collect the real-time injection volume of each injection well 3. and injection pressure And the real-time pumping volume of pumping well 4 associated with each injection well 3. and uranium concentration The real-time operating data collected by the sensor will be transmitted to the edge control module in the acid addition execution unit 2, and the edge control module will upload the real-time operating data to the control platform 1.

[0061] Step 20: Calculate the instantaneous leaching rate of each injection well within its effective control area based on the real-time pumping volume and the uranium concentration.

[0062] In this embodiment of the invention, the control platform 1 periodically (e.g., every 2 hours) acquires real-time operating data, specifically including the real-time injection volume of all injection wells within the defined control area. and injection pressure And the real-time pumping volume of each pumping well associated with the injection well. and uranium concentration For each injection well Based on the real-time pumping volume and the uranium concentration, as well as the total injection volume in the control area, the average uranium grade of the ore, and the comprehensive correction coefficient, the current instantaneous leaching rate of each injection well is calculated. .

[0063] Among them, injection wells Instantaneous leaching rate The calculation formula is as follows:

[0064]

[0065]

[0066] in, Indicates the first The uranium concentration of the pumping well, the first The pumping well and the first Related to a single pumping well. Indicates the first Real-time pumping volume of each pumping well This indicates the average uranium grade of the ore. This indicates the total injection volume in the controlled area. K This represents the comprehensive correction factor (calibrated on-site). The denominator, 1.005, is an industry-based calibration based on environmental protection requirements. The amount of liquid pumped is 5‰ more than the amount of liquid injected.

[0067] Step 30: Using the leaching rate of each injection well in the next cycle predicted based on the current acid addition strategy as an unknown variable, and combining it with the instantaneous leaching rate, construct an leaching rate equilibrium optimization function.

[0068] In this embodiment of the invention, when constructing the leaching-production rate equilibrium optimization function, the average leaching-production rate is calculated based on the current instantaneous leaching-production rate of each injection well; the leaching-production rate of each injection well in the next cycle, predicted based on the current acid addition strategy, is used as an unknown variable to construct the minimum fluctuation function of the leaching-production rate of each injection well in the next cycle relative to the instantaneous leaching-production rate; and the leaching-production rate equilibrium optimization function is determined based on the minimum fluctuation function.

[0069] The specific expression of the leaching rate equilibrium optimization function is as follows.

[0070]

[0071] in, This indicates the prediction based on the current acidification strategy. The leaching and recovery rate of each injection well in the next cycle is an unknown variable, i.e., the variable to be solved. This represents the current average leaching rate. The leaching rate balancing optimization function aims to make the leaching rate of each injection well as balanced as possible in the next cycle.

[0072] Step 40: Based on the real-time injection volume and the injection pressure, construct the acid concentration constraint and the acid demand constraint for the unknown variables, respectively.

[0073] In this embodiment of the invention, when constructing the acid concentration constraint and the acid demand constraint, an expression for the acid concentration regarding the unknown variable is constructed based on the average leaching rate, the instantaneous leaching rate, and the real-time injection volume; an expression for the acid demand regarding the unknown variable is constructed based on the acid concentration expression, the real-time injection volume, and the injection pressure; and acid concentration constraints and acid demand constraints regarding the unknown variable are constructed based on the acid concentration expression and the acid demand expression, respectively.

[0074] When constructing the specific acid demand expression, a theoretical acid demand function is constructed based on the acid concentration expression, the real-time injection volume, and the acid density, considering the unknown variable. Based on the real-time injection volume, the injection pressure, and the initial injection resistance, a permeability reduction compensation is calculated. It is determined whether the acid mixture temperature from the previous cycle exceeds a safe threshold, and based on the determination result, a temperature rise suppression compensation is calculated. Based on the theoretical acid demand function, the permeability reduction compensation, and the temperature rise suppression compensation, the acid demand expression for the unknown variable is determined.

[0075] The scheduling platform aims to minimize the standard deviation of the leaching and recovery rates of each injection well within a unit, and constructs an expression for acid concentration based on the leaching and recovery rate, as follows:

[0076]

[0077] in, Indicates the current moment for the first... The acid concentration added to each injection well, i.e., the target concentration; This represents the ideal injection flow rate of the injection well during design, which typically decreases gradually. For feedback gain (0.5-1.2); The injection volume compensation coefficient is (0.3-0.7). This indicates the basic acid concentration.

[0078] The above expression for acid concentration implements two core logics: first, if the leaching rate is higher than the average, the acid concentration is appropriately reduced, and vice versa, that is, the stability is maintained by peak shaving and valley filling; second, when the flow rate is insufficient, the concentration is moderately increased to compensate for the decrease in the transport capacity of the leaching agent.

[0079] Furthermore, the theoretical acid requirement is expressed using the acid concentration (target concentration), as follows:

[0080]

[0081] in, Indicates the first The theoretical acid demand of each injection well. This indicates the density of the acid solution.

[0082] Furthermore, two key compensation quantities are introduced, and the specific calculation formulas are as follows:

[0083]

[0084]

[0085]

[0086] in, Indicates the first Acid demand for each injection well; This indicates the amount of compensation for decreased permeability; Initial injection resistance refers to the pressure required per unit injection volume in the injection well during the initial stage of in-situ leaching mining, before the ore layer becomes blocked. It is a key parameter reflecting the original permeability of the ore layer, i.e., the pressure consumption per unit injection volume, similar to the concept of resistance in a circuit, and its unit is MPa / (m³ / h). This represents the compensation coefficient (0-0.1). This represents the compensation amount for temperature rise suppression, which is based on the acidic mixture temperature fed back from the previous cycle. Has the safety threshold been exceeded? (e.g., 70℃) to dynamically reduce the amount of acid added; The density of the acid solution; This represents the temperature compensation coefficient (0.1-0.7). The compensation for decreased permeability and the compensation for reduced temperature rise provide a protective buffer for the hardware.

[0087] Furthermore, constraints on acid concentration and acid demand are constructed as follows:

[0088]

[0089] in, This indicates the total amount of acid to be used in the block plan; This indicates the acid demand of all injection wells; and These represent the minimum and maximum acid concentrations, respectively.

[0090] Step 50: Based on the acid concentration constraint and the acid demand constraint, solve the leaching-production rate equilibrium optimization function to obtain the acid concentration and acid demand of each injection well.

[0091] In this embodiment of the invention, during the solution process, the leaching rate equilibrium optimization function is solved based on the acid concentration constraint and the acid demand constraint to obtain the leaching rate of each injection well in the next cycle. The leaching rate of each injection well in the next cycle is then substituted into the acid concentration expression and the acid demand expression for calculation to obtain the acid concentration and acid demand of each injection well.

[0092] By utilizing the constraints of acid concentration and acid demand, the leaching rate equilibrium optimization function can be solved, ensuring that the optimal equilibrium of the overall leaching process is achieved within the total acid consumption budget and concentration process boundary.

[0093] Step 60: Generate and send acid addition instructions for each injection well based on the acid concentration and acid demand of each injection well.

[0094] In this embodiment of the invention, the control platform sends the acid concentration and acid demand of each injection well to the corresponding edge controller via instructions. The edge controller drives the metering pump to execute, and at the same time, the readings of the front-mounted acid-resistant pH electrode and temperature sensor are used as inner loop feedback signals to perform rapid PID fine-tuning to ensure that the acid concentration and temperature at the outlet are stable within the set range, thereby forming a collaborative control mode of platform-optimized setting and edge rapid stabilization.

[0095] In some embodiments, the control platform can not only dynamically adjust the acid addition strategy of each injection well, but also design the volume of the buffer heat dissipation tank 232. Based on this, the method further includes: obtaining the allowable outlet temperature rise, buffer heat dissipation residence time, and sulfuric acid dilution heat of the buffer heat dissipation tank in the acid addition execution unit; determining the maximum allowable acid addition mass for each injection well; and designing the volume of the buffer heat dissipation tank based on the maximum allowable acid addition mass, the allowable outlet temperature rise, the buffer heat dissipation residence time, and the sulfuric acid dilution heat. The thermodynamic calculation formula for the volume of the buffer heat dissipation tank is as follows.

[0096]

[0097] in, This indicates the maximum allowable acid mass. Specifically, the maximum acid demand for each injection well can be determined based on the acid demand of each injection well in different cycles as determined by the control platform. Then, based on the maximum acid demand and the required margin for each injection well, the maximum allowable acid mass for each injection well can be determined. For example, if the maximum acid demand for a certain injection well is 2kg, the maximum allowable acid mass for that injection well can be determined to be 2.5-3kg based on the required margin. Indicates the heat of dilution of sulfuric acid; This indicates the allowable temperature rise at the outlet of the buffer cooling tank (outlet temperature set ≤ 50℃). Indicates the dwell time for buffering and heat dissipation; Represents the specific heat capacity of the acid; This indicates the heat exchange efficiency of the external coil, which is generally between 0.6 and 0.9.

[0098] Therefore, according to the above design, the control platform can design the volume of the buffer heat dissipation tank for each acid addition execution unit to ensure that the buffer heat dissipation tank has sufficient volume for the initial mixed solution to dissipate heat.

[0099] To make the technical solutions of the embodiments of the present invention clearer, the embodiments of the present invention will be described in detail below in conjunction with the actual conditions of a mining area of ​​the Hadatu uranium mine.

[0100] First, acid injection units 2 were installed at the wellheads of the selected 10 injection wells. The metering pumps have a range of 0.5-5 L / h. Using the thermodynamic calculation formula for the buffer tank volume, the volume of the buffer tank was determined to be 50 L, thus ensuring that the outlet acid temperature remains stable below 70℃, far below the softening point of PVDF. Second, the real-time injection volume of all injection wells within the designated planning area was obtained. and injection pressure And the real-time pumping volume of each pumping well associated with the injection well. and uranium concentration At the same time, set a temperature safety threshold. The temperature is 65℃, and the basic acid concentration is... 8 g / L, feedback gain The compensation coefficient is 0.8. It is 0.05.

[0101] The acid injection system operates automatically every 2 hours. Taking injection wells No. 3 and No. 7 as examples, after a period of operation, monitoring showed that the injection rate of injection well No. 3 slowly decreased from 3.0 m³ / h to 2.1 m³ / h, and its leaching recovery rate stagnated at 68%, while injection well No. 7 remained stable, and its leaching recovery rate rapidly increased to 85%. The control platform automatically adjusted the acid concentration from 8 g / L to 9.5 g / L using a model formula. Due to the decrease in flow rate and the increase in injection resistance, the acid demand calculated by the formula only increased slightly, while closely monitoring the outlet temperature. The acid concentration of injection well No. 7 was reduced to 7.0 g / L. After optimization using the leaching recovery rate balancing function, the total acid consumption remained unchanged, and the overall leaching recovery rate became more balanced.

[0102] After three months of operation, the standard deviation of the leaching rate of the 10 injection wells in the acquisition area decreased from the initial 22% to 9%, significantly improving the leaching-production balance. Specifically, the leaching rate of one injection well increased, leading to improved uranium recovery. Simultaneously, by avoiding ineffective acid consumption in inefficient areas and acid waste in efficient areas, the average acid consumption per ton of uranium decreased by approximately 11%. Throughout the entire system operation, no pipeline failures occurred due to the exothermic reaction caused by acid mixing.

[0103] The present invention provides an acid addition control method for in-situ leaching mining, which can adaptively adjust the acid addition strategy of each injection well based on the real-time injection volume and pressure of each injection well, as well as the real-time extraction volume and uranium concentration of the pumping well associated with each injection well. This dynamic acid addition strategy of the present invention can adapt to the differences in the ore layers of each well caused by increased heterogeneity and blockage during the mining process. Under the premise of ensuring pipeline safety, it can actively balance and accelerate the leaching process of each injection well, thereby reducing acid consumption and improving resource recovery rate.

[0104] Furthermore, as Figure 6 The specific implementation of the method shown in this embodiment provides an acid addition control device for in-situ leaching mining, such as... Figure 7 As shown, the device includes: an acquisition unit 101, a calculation unit 102, a construction unit 103, a solution unit 104, and a generation unit 105.

[0105] The acquisition unit 101 can be used to acquire the real-time injection volume and injection pressure of each injection well, as well as the real-time pumping volume and uranium concentration of the pumping well associated with each injection well.

[0106] The calculation unit 102 can be used to calculate the instantaneous leaching rate of each injection well within its effective control area based on the real-time pumping volume and the uranium concentration.

[0107] The construction unit 103 can be used to construct an leaching rate equilibrium optimization function by taking the leaching rate of each injection well in the next cycle predicted based on the current acid addition strategy as an unknown variable and combining it with the instantaneous leaching rate.

[0108] The construction unit 103 can also be used to construct acid concentration constraints and acid demand constraints for the unknown variables based on the real-time injection volume and the injection pressure.

[0109] The solution unit 104 can be used to solve the leaching rate equilibrium optimization function based on the acid concentration constraint and the acid demand constraint to obtain the acid concentration and acid demand of each injection well.

[0110] The generation unit 105 can be used to generate and send acid addition instructions for each injection well based on the acid concentration and acid demand of each injection well.

[0111] In some embodiments, the calculation unit 102 may be specifically used to calculate the current instantaneous leaching rate of each injection well based on the real-time pumping volume and the uranium concentration, as well as the total injection volume of the control area, the average uranium grade of the ore, and the comprehensive correction coefficient.

[0112] In some embodiments, the construction unit 103 may be specifically used to calculate the average leaching rate based on the current instantaneous leaching rate of each injection well; to construct the minimum fluctuation function of the leaching rate of each injection well in the next cycle relative to the instantaneous leaching rate, using the leaching rate of each injection well in the next cycle predicted based on the current acid addition strategy as an unknown variable; and to determine the leaching rate equilibrium optimization function based on the minimum fluctuation function.

[0113] In some embodiments, the building unit 103 includes: a first building module, a second building module, and a third building module.

[0114] The first construction module can be used to construct an expression for the acid concentration of the unknown variable based on the average leaching rate, the instantaneous leaching rate, and the real-time injection volume.

[0115] The second construction module can be used to construct an expression for the acid demand of the unknown variable based on the acid concentration expression, the real-time injection volume, and the injection pressure.

[0116] The third construction module can be used to construct acid concentration constraints and acid demand constraints for the unknown variables based on the acid concentration expression and the acid demand expression, respectively.

[0117] In some embodiments, the second construction module may be specifically configured to: construct a theoretical acid demand function for the unknown variable based on the acid concentration expression, the real-time injection volume, and the acid density; calculate a permeability reduction compensation amount based on the real-time injection volume, the injection pressure, and the initial injection resistance; determine whether the acid mixture temperature fed back in the previous cycle exceeds a safety threshold, and calculate a temperature rise suppression compensation amount based on the determination result; and determine an acid demand expression for the unknown variable based on the theoretical acid demand function, the permeability reduction compensation amount, and the temperature rise suppression compensation amount.

[0118] In some embodiments, the solving unit 104 may be specifically used to solve the leaching rate equilibrium optimization function based on the acid concentration constraint and the acid demand constraint to obtain the leaching rate of each injection well in the next cycle; and to substitute the leaching rate of each injection well in the next cycle into the acid concentration expression and the acid demand expression for calculation to obtain the acid concentration and acid demand of each injection well.

[0119] In some embodiments, the apparatus further includes a design unit.

[0120] The design unit can be used to obtain the allowable outlet temperature rise, buffer heat dissipation residence time, and sulfuric acid dilution heat of the buffer heat dissipation tank in the acid addition execution unit; determine the maximum allowable acid addition mass of each injection well; and design the volume of the buffer heat dissipation tank based on the maximum allowable acid addition mass, the allowable outlet temperature rise, the buffer heat dissipation residence time, and the sulfuric acid dilution heat.

[0121] It should be noted that other corresponding descriptions of the functional units involved in the acid addition control device for in-situ leaching mining provided in this embodiment can be found in [reference]. Figure 6 The corresponding description in [the document] will not be repeated here.

[0122] Based on the above, Figure 6 Accordingly, this embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements the above-described method. Figure 6 The acid control method shown is used for in-situ leaching mining.

[0123] Based on this understanding, the technical solution of this application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as CD-ROM, USB flash drive, mobile hard drive, etc.) and includes several instructions to cause an electronic device (such as personal computer, server, or network device, etc.) to execute the methods of various implementation scenarios of this application.

[0124] Based on the above, Figure 6 The method shown, and Figure 7 To achieve the above objectives, the present application also provides an electronic device, specifically a personal computer, tablet computer, server, or other network device, as shown in the virtual device embodiment. This device includes a storage medium and a processor; the storage medium stores a computer program; the processor executes the computer program to achieve the above-described objectives. Figure 6 The acid control method shown is used for in-situ leaching mining.

[0125] Optionally, the aforementioned physical devices may also include a user interface, a network interface, a camera, radio frequency (RF) circuitry, sensors, audio circuitry, a Wi-Fi module, etc. The user interface may include a display screen, input units such as a keyboard, etc., and optional user interfaces may also include USB interfaces, card reader interfaces, etc. The network interface may optionally include standard wired interfaces, wireless interfaces (such as Wi-Fi interfaces), etc.

[0126] Those skilled in the art will understand that the physical device structure provided in this embodiment does not constitute a limitation on the physical device, and may include more or fewer components, or combine certain components, or have different component arrangements.

[0127] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the aforementioned physical device, supporting the operation of information processing programs and other software and / or programs. The network communication module is used to enable communication between the various components within the storage medium, as well as communication with other hardware and software in the information processing physical device.

[0128] Through the above description of the embodiments, those skilled in the art can clearly understand that this application can be implemented by means of software plus necessary general-purpose hardware platform, or it can be implemented by hardware.

[0129] The embodiments of the present invention can adaptively adjust the acid addition strategy of each injection well based on the real-time injection volume and injection pressure of each injection well, as well as the real-time extraction volume and uranium concentration of the pumping wells associated with each injection well. This dynamic acid addition strategy of the present invention can adapt to the differences in the ore layers of each well caused by the intensification of heterogeneity and blockage during the mining process. Under the premise of ensuring pipeline safety, it can actively balance and accelerate the leaching process of each injection well, thereby reducing acid consumption and improving resource recovery rate.

[0130] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of a preferred embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing this application. Those skilled in the art will understand that the modules in the apparatus of the embodiment can be distributed within the apparatus of the embodiment as described, or can be modified to be located in one or more apparatuses different from this embodiment. The modules of the above-described embodiment can be combined into one module, or further divided into multiple sub-modules.

[0131] The serial numbers in this application are for descriptive purposes only and do not represent the superiority or inferiority of any particular implementation scenario. The above disclosures are merely a few specific implementation scenarios of this application; however, this application is not limited thereto, and any variations conceived by those skilled in the art should fall within the protection scope of this application.

Claims

1. A method of acid addition control for in-situ leaching mining, characterised in that, The control platform used in acid addition systems includes: The real-time injection volume and injection pressure of each injection well, as well as the real-time pumping volume and uranium concentration of the pumping wells associated with each injection well, are obtained. Based on the real-time extraction volume and the uranium concentration, calculate the instantaneous leaching recovery rate of each injection well within its effective control area; The leaching rate of each injection well in the next cycle, predicted based on the current acid addition strategy, is used as an unknown variable. Combined with the instantaneous leaching rate, a leaching rate equilibrium optimization function is constructed. Based on the real-time injection volume and the injection pressure, respectively construct constraints on the acid concentration and acid demand for the unknown variables; Based on the acid concentration constraint and the acid demand constraint, the leaching rate equilibrium optimization function is solved to obtain the acid concentration and acid demand of each injection well. Based on the acid concentration and acid demand of each injection well, an acid addition command is generated and sent to each injection well. The step of calculating the instantaneous leaching recovery rate of each injection well within its effective control area based on the real-time pumping volume and the uranium concentration includes: Based on the real-time extraction volume and the uranium concentration, as well as the total injection volume in the control area, the average uranium grade of the ore, and the comprehensive correction coefficient, the current instantaneous leaching rate of each injection well is calculated. The step of using the leaching and production rate of each injection well in the next cycle, predicted based on the current acid addition strategy, as an unknown variable, and combining it with the instantaneous leaching and production rate, to construct an leaching and production rate equilibrium optimization function includes: Calculate the average leaching rate based on the current instantaneous leaching rate of each injection well; Using the leaching rate of each injection well in the next cycle predicted based on the current acid addition strategy as an unknown variable, a minimum fluctuation function of the leaching rate of each injection well in the next cycle relative to the instantaneous leaching rate is constructed. Based on the minimum fluctuation function, determine the leaching rate equilibrium optimization function; The process of constructing acid concentration constraints and acid demand constraints for the unknown variables based on the real-time injection volume and the injection pressure includes: Based on the average leaching rate, the instantaneous leaching rate, and the real-time injection volume, an expression for the acid concentration of the unknown variable is constructed; Based on the acid concentration expression, the real-time injection volume, and the injection pressure, construct an expression for the acid demand of the unknown variable; Based on the expression for acid concentration and the expression for acid demand, construct the constraints for acid concentration and the constraints for acid demand regarding the unknown variables, respectively. The step of constructing an expression for the acid demand of the unknown variable based on the acid concentration expression, the real-time injection volume, and the injection pressure includes: Based on the acid concentration expression, the real-time injection volume, and the acid density, a theoretical acid demand function is constructed regarding the unknown variables. Based on the real-time injection volume and injection pressure, as well as the initial injection resistance, calculate the permeability reduction compensation amount; Determine whether the temperature of the acidic mixture fed back in the previous cycle exceeds the safety threshold, and calculate the temperature rise suppression compensation amount based on the determination result; Based on the theoretical acid demand function, the permeability reduction compensation, and the temperature rise inhibition compensation, the expression for the acid demand with respect to the unknown variable is determined; The process involves solving the leaching-production rate equilibrium optimization function based on the acid concentration constraint and the acid demand constraint to obtain the acid concentration and acid demand for each injection well, including: Based on the acid concentration constraint and the acid demand constraint, the leaching rate equilibrium optimization function is solved to obtain the leaching rate of each injection well in the next cycle. The leaching and recovery rates of each injection well in the next cycle are substituted into the acid concentration expression and the acid demand expression to calculate the acid concentration and acid demand of each injection well.

2. The method of claim 1, wherein, The method further includes: Obtain the allowable temperature rise at the outlet of the buffer heat dissipation tank in the acid addition execution unit, the buffer heat dissipation residence time, and the heat of sulfuric acid dilution; Determine the maximum permissible acid mass for each injection well; The volume of the buffer cooling tank is designed based on the maximum allowable acid addition mass, the allowable outlet temperature rise, the buffer heat dissipation residence time, and the sulfuric acid dilution heat.

3. An acid addition system for in-situ leaching mining, characterized in that, The acid control method according to claim 1 or 2 includes: The control platform is used to acquire the real-time injection volume and injection pressure of each injection well, as well as the real-time extraction volume and uranium concentration of the pumping wells associated with each injection well. Based on the real-time injection volume, injection pressure, real-time extraction volume, and uranium concentration, it calculates the acid concentration and acid requirement of each injection well. Based on the acid concentration and acid requirement of each injection well, it generates acid addition instructions for each injection well. The acid addition execution units distributed at the wellheads of each injection well are used to receive the acid addition command sent by the control platform, and perform acid addition operation to each injection well according to the acid concentration and acid demand carried in the acid addition command.

4. The system of claim 3, wherein, The acid addition execution unit includes: a concentrated sulfuric acid metering module, a mixing and heat dissipation module, and an edge control module; The edge control module is used to receive the acid addition command sent by the control platform, and control the concentrated sulfuric acid metering module to perform concentrated sulfuric acid metering operation according to the acid concentration and acid demand carried in the acid addition command. The mixed heat dissipation module is used to receive concentrated sulfuric acid after it has been metered by the concentrated sulfuric acid metering module, and to mix, dilute and dissipate the metered concentrated sulfuric acid to output an acidic mixture that meets the acid concentration, and to add the acidic mixture to the corresponding injection well.

5. The system of claim 4, wherein, The concentrated sulfuric acid metering module includes: a concentrated acid storage tank, an acid addition branch pipe, a metering pump, and a flow meter; the acid addition branch pipe is connected to the outlet of the concentrated acid storage tank and the mixing and heat dissipation module, respectively, and the metering pump and the flow meter are installed on the acid addition branch pipe.

6. The system of claim 4, wherein, The hybrid heat dissipation module includes a premixer, a buffer heat dissipation tank, and a static mixer; The inlet of the premixer is connected to the concentrated sulfuric acid metering module and the main water flow pipeline respectively. The premixer is used to draw in the metered concentrated sulfuric acid when the main water flow passes through, and to perform preliminary mixing and dilution with the main water flow to obtain a preliminary mixture. The inlet of the buffer cooling tank is connected to the outlet of the premixer, and the outlet of the buffer cooling tank is connected to the inlet of the static mixer. The tank body of the buffer cooling tank is wound with a coil, and the coil is connected to the cooling water inlet pipe. The buffer cooling tank is used to dissipate heat from the preliminary mixture through the cooling water in the coil to obtain a cooled mixture. The inlet of the static mixer is connected to the cooling water outlet pipe, the cooling water outlet pipe is connected to the coil, and the outlet of the static mixer is connected to the injection main pipe. The static mixer is used to uniformly mix the heat-dissipated mixture with the cooling water flowing through the coil to obtain an acidic mixture that meets the acid concentration, and then add the acidic mixture that meets the acid concentration to the corresponding injection well through the injection main pipe.

7. The system according to claim 6, characterized in that, The main injection pipe is equipped with a variety of sensors, and the edge control module is also used to send the collected signals from the various sensors to the control platform.

8. An acid addition control device for in-situ leaching mining, characterized in that, include: The acquisition unit is used to acquire the real-time injection volume and injection pressure of each injection well, as well as the real-time extraction volume and uranium concentration of the pumping well associated with each injection well. The calculation unit is used to calculate the instantaneous leaching rate of each injection well within its effective control area based on the real-time pumping volume and the uranium concentration. The construction unit is used to construct an leaching rate equilibrium optimization function by taking the leaching rate of each injection well in the next cycle predicted based on the current acid addition strategy as an unknown variable and combining it with the instantaneous leaching rate. The construction unit is also used to construct acid concentration constraints and acid demand constraints for the unknown variables based on the real-time injection volume and the injection pressure, respectively. The solution unit is used to solve the leaching rate equilibrium optimization function based on the acid concentration constraint and the acid demand constraint to obtain the acid concentration and acid demand of each injection well. The generation unit is used to generate and send acid addition instructions for each injection well based on the acid concentration and acid demand of each injection well. The calculation unit is specifically used to calculate the current instantaneous leaching rate of each injection well based on the real-time pumping volume and the uranium concentration, as well as the total injection volume in the control area, the average uranium grade of the ore, and the comprehensive correction coefficient. The construction unit is specifically used to calculate the average leaching rate based on the current instantaneous leaching rate of each injection well; to construct the minimum fluctuation function of the leaching rate of each injection well in the next cycle relative to the instantaneous leaching rate, using the leaching rate of each injection well in the next cycle predicted based on the current acid addition strategy as an unknown variable; and to determine the leaching rate equilibrium optimization function based on the minimum fluctuation function. The building unit includes: a first building module, a second building module, and a third building module. The first construction module is used to construct an expression for the acid concentration of the unknown variable based on the average leaching rate, the instantaneous leaching rate, and the real-time injection volume; The second construction module is used to construct an expression for the acid demand of the unknown variable based on the acid concentration expression, the real-time injection volume, and the injection pressure. The third construction module is used to construct, based on the acid concentration expression and the acid demand expression, constraints on the unknown variables, namely, constraints on acid concentration and constraints on acid demand. The second construction module is specifically used to construct a theoretical acid demand function for the unknown variable based on the acid concentration expression, the real-time injection volume, and the acid density; calculate the permeability reduction compensation based on the real-time injection volume, the injection pressure, and the initial injection resistance; determine whether the acid mixture temperature fed back in the previous cycle exceeds the safety threshold, and calculate the temperature rise suppression compensation based on the determination result; and determine the acid demand expression for the unknown variable based on the theoretical acid demand function, the permeability reduction compensation, and the temperature rise suppression compensation. The solution unit is specifically used to solve the leaching rate equilibrium optimization function based on the acid concentration constraint and the acid demand constraint to obtain the leaching rate of each injection well in the next cycle; and to substitute the leaching rate of each injection well in the next cycle into the acid concentration expression and the acid demand expression to calculate the acid concentration and acid demand of each injection well.

9. A storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method of claim 1 or 2.

10. An electronic device comprising a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of claim 1 or 2.

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