A control device and method for in-situ leaching of uranium leaching qualified liquid plus alkali precipitation

Abstract

The application discloses a kind of in-situ leaching uranium leaching qualified liquid adds alkali precipitation control device and method, it is related to in-situ leaching uranium technical field, control device includes monitoring component, regulation and control component and PLC controller;Monitoring component and regulation and control component are all set on precipitation component, and all are connected with PLC controller;Regulation and control component is used to: according to leaching qualified liquid addition amount adjustment instruction control the flow of leaching qualified liquid sent into precipitation component, according to the flow of acidic liquid of acidic liquid addition amount adjustment instruction control, according to the mass of solid of solid addition amount adjustment instruction control the solid sent into precipitation component, according to the standing precipitation time of slurry of precipitation standing instruction control, according to the flow of precipitated mother liquor of precipitated mother liquor discharge adjustment instruction control, according to the flow of slurry of slurry discharge adjustment instruction control.The application realizes fast and accurate automatic control to in-situ leaching uranium leaching qualified liquid adds alkali precipitation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of in-situ leaching of uranium, in particular to a control device and method for in-situ leaching of uranium leaching qualified liquid plus alkali precipitation. BACKGROUND

[0002] In the process of in-situ leaching of uranium, due to the large amount of leaching liquid, low uranium concentration and complex composition, ion exchange resin is usually used to adsorb and recover uranium in the leaching liquid. When the resin reaches adsorption saturation, uranium is eluted with a specific eluent to obtain a leaching qualified liquid with high uranium concentration. The leaching qualified liquid is transferred to a precipitation tank, the pH value is adjusted by adding alkali to precipitate uranium, and after the precipitation is complete, the upper mother liquor is removed, and the leaching qualified liquid is added again for the next uranium precipitation. After multiple precipitations, the slurry containing a large amount of precipitate is transferred to a plate and frame filter press for solid-liquid separation, and finally a diuranate product is obtained. The alkali added is usually NaOH solid. The uranium precipitation process is a liquid-solid phase transition process, and the purpose is to recover all the uranium in the leaching qualified liquid. According to the acid-base property of the leaching qualified liquid, it can be divided into acidic qualified liquid and alkaline qualified liquid. The acidic qualified liquid can be directly precipitated by adding NaOH solid, and has good precipitation effect. However, the alkaline qualified liquid contains a large amount of carbonate, and the stability of the uranyl carbonate complex is higher than that of the diuranate formed by uranium and hydroxyl ions, resulting in low precipitation efficiency, high uranium concentration in the mother liquor, and large reagent consumption. To solve this problem, hydrochloric acid is usually used to acidify the alkaline qualified liquid before adding alkali for precipitation, to reduce the stability of the uranyl carbonate complex, improve the precipitation efficiency, and reduce the uranium concentration in the mother liquor and the cost of reagents.

[0003] At present, the in-situ leaching of uranium leaching qualified liquid plus alkali precipitation process has not been realized automatic control, and the key operation end points such as acidification and precipitation still need to be judged according to the analysis results of the solution, which leads to frequent sample analysis, and the volume and composition of each leaching qualified liquid are different, so it is difficult for the operator to accurately control the process parameters. SUMMARY

[0004] The purpose of the present application is to provide a control device and method for in-situ leaching of uranium leaching qualified liquid plus alkali precipitation, which realizes rapid and accurate automatic control of the in-situ leaching of uranium leaching qualified liquid plus alkali precipitation process.

[0005] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0006] In a first aspect, the present application provides a control device for in-situ leaching of uranium leaching qualified liquid plus alkali precipitation, which is arranged on a precipitation assembly. The control device comprises a monitoring assembly, a regulation and control assembly, and a PLC controller.

[0007] The monitoring assembly and the regulating assembly are arranged on the precipitation assembly; and the monitoring assembly and the regulating assembly are connected with the PLC controller;

[0008] The monitoring assembly is configured to collect the eluate flow value, the pH value, the precipitation mother liquor flow value and the precipitation layer thickness value in the precipitation assembly.

[0009] The PLC controller is configured to determine an eluate flow adjustment instruction based on the eluate flow value, determine an acidic liquid flow adjustment instruction, a solid flow adjustment instruction and a precipitation standing instruction based on the pH value, determine a precipitation mother liquor discharge adjustment instruction based on the precipitation mother liquor flow value, and determine a slurry discharge adjustment instruction based on the precipitation layer thickness value.

[0010] The regulating assembly is configured to control the flow of the eluate fed into the precipitation assembly according to the eluate flow adjustment instruction, control the flow of the acidic liquid fed into the precipitation assembly according to the acidic liquid flow adjustment instruction, control the mass of the solid fed into the precipitation assembly according to the solid flow adjustment instruction, control the standing precipitation time of the slurry in the precipitation assembly according to the precipitation standing instruction, control the flow of the precipitation mother liquor discharged from the precipitation assembly according to the precipitation mother liquor discharge adjustment instruction, and control the flow of the slurry discharged from the precipitation assembly according to the slurry discharge adjustment instruction.

[0011] In a second aspect, the present application provides a control method for in-situ leaching uranium eluate alkali precipitation, which is applied to a control device for in-situ leaching uranium eluate alkali precipitation, and the method comprises the following steps:

[0012] Collecting the eluate flow value, the pH value, the precipitation mother liquor flow value and the precipitation layer thickness value in the precipitation assembly.

[0013] Determining an eluate flow adjustment instruction based on the eluate flow value, determining an acidic liquid flow adjustment instruction, a solid flow adjustment instruction and a precipitation standing instruction based on the pH value, determining a precipitation mother liquor discharge adjustment instruction based on the precipitation mother liquor flow value, and determining a slurry discharge adjustment instruction based on the precipitation layer thickness value.

[0014] Controlling the flow of the eluate fed into the precipitation assembly according to the eluate flow adjustment instruction, controlling the flow of the acidic liquid fed into the precipitation assembly according to the acidic liquid flow adjustment instruction, controlling the mass of the solid fed into the precipitation assembly according to the solid flow adjustment instruction, controlling the standing precipitation time of the slurry in the precipitation assembly according to the precipitation standing instruction, controlling the flow of the precipitation mother liquor discharged from the precipitation assembly according to the precipitation mother liquor discharge adjustment instruction, and controlling the flow of the slurry discharged from the precipitation assembly according to the slurry discharge adjustment instruction.

[0015] According to the specific embodiments provided by the present application, the following technical effects are disclosed:

[0016] The application discloses a control device and method for in-situ leaching uranium leaching qualified liquid alkali precipitation, wherein the monitoring assembly and the regulating assembly are arranged on the precipitation assembly; the monitoring assembly and the regulating assembly are connected with the PLC controller; the PLC controller is used to determine a leaching qualified liquid addition amount adjusting instruction based on a leaching qualified liquid flow value, determine an acidic liquid addition amount adjusting instruction, a solid addition amount adjusting instruction and a precipitation standing instruction based on a pH value, determine a precipitation mother liquor discharge adjusting instruction based on a precipitation mother liquor flow value, and determine a slurry discharge adjusting instruction based on a precipitation layer thickness value. Then, the regulating assembly is used to control the flow of the leaching qualified liquid, the flow of the acidic liquid and the mass of the solid sent into the precipitation assembly, control the standing precipitation time of the slurry in the precipitation assembly, and control the flow of the precipitation mother liquor and the flow of the slurry discharged from the precipitation assembly based on the corresponding instructions. The application does not need manual participation in the whole process, realizes automatic control of important process links by monitoring key process parameters on line, reduces the workload of personnel, and improves the control precision of process parameters. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 It is a schematic diagram of the control device for in-situ leaching uranium leaching qualified liquid alkali precipitation.

[0019] Figure 2 It is a part of the flowchart in the control method for in-situ leaching uranium leaching qualified liquid alkali precipitation. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0021] To address the problems associated with alkali precipitation in qualified uranium leaching solutions from in-situ leaching, this invention provides a control device and method for alkali precipitation in qualified uranium leaching solutions from in-situ leaching. The device monitors important parameters such as flow rate, pH value, and precipitate layer thickness online using monitoring equipment. Automated control is achieved based on the monitoring results of key parameters during the alkali precipitation process of the qualified leaching solution, improving the accuracy of process parameter control and reducing personnel workload.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] like Figure 1 As shown, the present invention provides a control device for adding alkali to precipitate qualified uranium leaching solution, which is installed on a precipitation assembly. The precipitation assembly includes a qualified leaching solution pipeline, a hydrochloric acid pipeline, a precipitate mother liquor pipeline, a slurry pipeline, and a precipitation tank. The qualified leaching solution pipeline, the hydrochloric acid pipeline, the precipitate mother liquor pipeline, and the slurry pipeline are all connected to the precipitation tank.

[0025] The control device includes a monitoring component, a control component, and a PLC controller. Both the monitoring component and the control component are mounted on the sedimentation component; both the monitoring component and the control component are connected to the PLC controller.

[0026] The monitoring components include a pH meter P, a first electromagnetic flow meter F1, a second electromagnetic flow meter F2, a third electromagnetic flow meter F3, and an ultrasonic mud-water interface meter S; the first electromagnetic flow meter F1 is installed on the qualified rinsing liquid pipeline; the second electromagnetic flow meter F2 is installed on the sedimentation mother liquor pipeline; the third electromagnetic flow meter F3 is installed on the slurry pipeline; the pH meter P is installed inside the sedimentation tank; and the ultrasonic mud-water interface meter S is installed at the top of the sedimentation tank.

[0027] The monitoring component is used to collect the flow rate of the qualified rinsing solution, pH value, flow rate of the mother liquor, and thickness of the sedimentation layer in the sedimentation component.

[0028] The PLC controller is used to determine the addition adjustment command of the qualified rinsing liquid based on the flow rate value of the qualified rinsing liquid, to determine the addition adjustment command of the acidic liquid, the addition adjustment command of the solid liquid and the sedimentation and settling command based on the pH value, to determine the discharge adjustment command of the sedimentation mother liquor based on the flow rate value of the sedimentation mother liquor, and to determine the discharge adjustment command of the slurry based on the sedimentation layer thickness value.

[0029] The control assembly comprises a first pipeline pump R1, a first electromagnetic valve V1, a stirrer J, a second pipeline pump R2, a second electromagnetic valve V2, a solid feeder G, a third pipeline pump R3, a third electromagnetic valve V3, a fourth pipeline pump R4 and a fourth electromagnetic valve V4; the first pipeline pump R1 and the first electromagnetic valve V1 are arranged on the eluate pipeline; the second pipeline pump R2 and the second electromagnetic valve V2 are arranged on the hydrochloric acid pipeline; the third pipeline pump R3 and the third electromagnetic valve V3 are arranged on the precipitation mother liquor pipeline; the fourth pipeline pump R4 and the fourth electromagnetic valve V4 are arranged on the slurry pipeline; the solid feeder G and the stirrer J are arranged on the top of the precipitation tank.

[0030] In one specific example, the first pipeline pump R1 and the first electromagnetic flowmeter F1 are installed on the eluate pipeline, the first electromagnetic valve V1 is installed near the eluate inlet on the top of the precipitation tank, the stirrer J is installed at the center of the top of the precipitation tank, the pH meter P is installed in the lower part of the precipitation tank, the second pipeline pump R2 and the second electromagnetic valve V2 are installed on the hydrochloric acid pipeline, the solid feeder G is installed on the top of the precipitation tank, the ultrasonic sludge-water interface instrument S is installed on the top of the precipitation tank, the third pipeline pump R3 and the second electromagnetic flowmeter F2 are installed on the precipitation mother liquor pipeline, the third electromagnetic valve V3 is installed near the precipitation mother liquor outlet on the top of the precipitation tank, the fourth pipeline pump R4 and the third electromagnetic flowmeter F3 are installed on the slurry pipeline, and the fourth electromagnetic valve V4 is installed near the slurry outlet on the bottom of the precipitation tank. Further, the inlet of the precipitation mother liquor pipeline is 0.3-0.4 m higher than the highest interface of the precipitation layer, and the probe of the ultrasonic sludge-water interface instrument is 0.1-0.2 m higher than the highest interface of the precipitation layer.

[0031] The control assembly is used to control the flow of the eluate sent into the precipitation assembly according to the eluate amount adjustment instruction, control the flow of the acidic liquid sent into the precipitation assembly according to the acidic liquid amount adjustment instruction, control the mass of the solid sent into the precipitation assembly according to the solid amount adjustment instruction, control the standing precipitation time of the slurry in the precipitation assembly according to the precipitation standing instruction, control the flow of the precipitation mother liquor discharged from the precipitation assembly according to the precipitation mother liquor discharge adjustment instruction, and control the flow of the slurry discharged from the precipitation assembly according to the slurry discharge adjustment instruction.

[0032] Embodiment Two

[0033] In order to achieve the technical solutions in Embodiment One and achieve the corresponding functions and technical effects, the present embodiment further provides a control method for in-situ leaching uranium eluate alkali precipitation, which is applied to the control device for in-situ leaching uranium eluate alkali precipitation in Embodiment One, and the method comprises the following steps.

[0034] Step one, collect the eluate flow value, pH value, precipitation mother liquor flow value and precipitation layer thickness value in the precipitation assembly.

[0035] Step two, determine the eluate flow adjustment instruction based on the eluate flow value, determine the acidic liquid flow adjustment instruction, solid flow adjustment instruction and precipitation standing instruction based on the pH value, determine the precipitation mother liquor discharge adjustment instruction based on the precipitation mother liquor flow value, and determine the slurry discharge adjustment instruction based on the precipitation layer thickness value.

[0036] Step three, control the flow of eluate into the precipitation assembly according to the eluate flow adjustment instruction, control the flow of acidic liquid into the precipitation assembly according to the acidic liquid flow adjustment instruction, control the mass of solid into the precipitation assembly according to the solid flow adjustment instruction, control the standing precipitation time of slurry in the precipitation assembly according to the precipitation standing instruction, control the flow of precipitation mother liquor discharged from the precipitation assembly according to the precipitation mother liquor discharge adjustment instruction, and control the flow of slurry discharged from the precipitation assembly according to the slurry discharge adjustment instruction.

[0037] In one specific embodiment, before starting control, all solenoid valves are in the closed state, and after starting control, the specific steps include:

[0038] (1) Open the first solenoid valve V1, start the first pipeline pump R1, and run the first electromagnetic flowmeter F1. At this time, the eluate flow adjustment instruction is determined based on the collected eluate flow value, which specifically includes:

[0039] When the eluate flow value is not zero, the eluate has not been completely transferred to the precipitation tank, and a first eluate flow adjustment instruction is generated. The first eluate flow adjustment instruction is used to indicate the flow of eluate into the precipitation assembly. When the control assembly controls based on the first eluate flow adjustment instruction, the specific operation is to maintain the operation of opening the first solenoid valve V1, starting the first pipeline pump R1, and running the first electromagnetic flowmeter F1.

[0040] When the eluate flow value is zero, the eluate has been completely transferred to the precipitation tank, and a second eluate flow adjustment instruction is generated. The second eluate flow adjustment instruction is used to indicate the stop of eluate into the precipitation assembly. When the control assembly controls based on the second eluate flow adjustment instruction, the specific operation is to stop the first pipeline pump R1, close the first solenoid valve V1, close the first electromagnetic flowmeter F1, start the stirrer J, and run the pH meter P to collect the pH value of the solution in the precipitation tank.

[0041] (2) IfFigure 2 The acid liquid amount adjustment instruction, the solid amount adjustment instruction and the precipitation standing instruction are determined based on the pH value, and specifically include:

[0042] 1) When the pH value is greater than or equal to a preset acidic pH value, the eluate needs to be acidified, and at this time, a first acid liquid amount adjustment instruction and a first solid amount adjustment instruction are generated; the first acid liquid amount adjustment instruction is used to indicate that the acid liquid is fed into the precipitation assembly, and the first solid amount adjustment instruction is used to indicate that the feeding of the solid into the precipitation assembly is stopped.

[0043] When the control assembly controls based on the first acid liquid (specifically hydrochloric acid) amount adjustment instruction, the specific operation is to open the second electromagnetic valve V2 and start the second pipeline pump R2. At this time, the components related to the solid amount, such as the solid feeder G, are not in action.

[0044] 2) When the pH value is less than the preset acidic pH value, or the pH value is less than the preset basic pH value, a second acid liquid amount adjustment instruction and a second solid amount adjustment instruction are generated; the second acid liquid amount adjustment instruction is used to indicate that the feeding of the acid liquid into the precipitation assembly is stopped, and the second solid amount adjustment instruction is used to indicate that the solid is fed into the precipitation assembly. The preset acidic pH value ranges from 4.5 to 5.0.

[0045] When the control assembly controls based on the second acid liquid amount adjustment instruction, the eluate does not need to be acidified, and the specific operation is to stop the second pipeline pump R2 and close the second electromagnetic valve V2.

[0046] When the control assembly controls based on the second solid amount adjustment instruction, the specific operation is to start the solid feeder G and slowly add NaOH solid into the precipitation assembly of the precipitation assembly.

[0047] 3) When the pH value is greater than or equal to a preset basic pH value, the second acid liquid amount adjustment instruction, the first solid amount adjustment instruction and the precipitation standing instruction are generated. The preset basic pH value ranges from 12 to 13.

[0048] When the control assembly controls based on the precipitation standing instruction, the addition of NaOH solid is stopped, and the specific operation is to stop the solid feeder G and the stirrer J, close the pH meter P, and perform precipitation standing for a preset time. The preset time is set to range from 12h to 36h.

[0049] (3) After the precipitation preset time, the precipitation mother liquor discharge adjustment instruction is determined based on the precipitation mother liquor flow value, and specifically includes:

[0050] When the precipitation mother liquor flow value is not zero, a first precipitation mother liquor discharge adjustment instruction is generated; the first precipitation mother liquor discharge adjustment instruction is used to represent that the precipitation mother liquor is discharged from the precipitation assembly; when the regulation assembly is regulated based on the first precipitation mother liquor discharge adjustment instruction, the specific operation is to open the third electromagnetic valve V3, start the third pipeline pump R3, and run the second electromagnetic flowmeter F2.

[0051] When the precipitation mother liquor flow value is zero, it indicates that the precipitation mother liquor is empty, and a second precipitation mother liquor discharge adjustment instruction is generated; the second precipitation mother liquor discharge adjustment instruction is used to represent that the precipitation mother liquor is stopped from being discharged from the precipitation assembly. When the regulation assembly is regulated based on the second precipitation mother liquor discharge adjustment instruction, the specific operation is to stop the third pipeline pump R3, close the third electromagnetic valve V3, and close the second electromagnetic flowmeter F2. At the same time, the ultrasonic sludge-water interface instrument S is started to monitor the thickness of the precipitation layer.

[0052] (4) A slurry discharge adjustment instruction is determined based on the thickness of the precipitation layer, specifically including: when the thickness of the precipitation layer is greater than or equal to a preset thickness value, a slurry discharge adjustment instruction is generated. When the regulation assembly is regulated based on the slurry discharge adjustment instruction, the specific operation is to open the fourth electromagnetic valve V4, start the fourth pipeline pump R4, and run the third electromagnetic flowmeter F3 to transfer the slurry to the plate-and-frame filter press for solid-liquid separation. When the third electromagnetic flowmeter F3 shows 0 (i.e., when the thickness of the precipitation layer is zero), it indicates that the slurry is completely empty, at which time the fourth pipeline pump R4 is stopped, the fourth electromagnetic valve V4 is closed, and the third electromagnetic flowmeter F3 is closed.

[0053] When the thickness of the precipitation layer is less than the preset thickness value, the precipitation cycle needs to be continued, and the next uranium precipitation is performed, that is, the elution qualified liquid that needs to be added to the precipitation tank is reset, then the first electromagnetic valve V1 is opened, the first pipeline pump R1 is started, and the first electromagnetic flowmeter F1 is run, and subsequent regulation is performed based on the collected elution qualified liquid flow value. The preset thickness value is in the range of 1.5 m-2.0 m.

[0054] It should be noted that, Figure 2 In the formula, pH0 represents the pH value of the elution qualified liquid for setting the start of acidification, that is, the preset acidic pH value; pH1 represents the pH value of the collected elution qualified liquid; pH2 represents the pH value of the slurry for setting the end of alkali addition, that is, the preset alkaline pH value; pH3 represents the pH value of the slurry formed after the elution qualified liquid and NaOH solid are fused, that is, the pH value of the slurry; D0 represents the thickness of the precipitation layer for setting the start of solid-liquid separation, that is, the preset thickness value; and D1 represents the thickness of the collected precipitation layer.

[0055] Based on the above, the application further provides three specific examples.

[0056] Example 1.

[0057] The leaching qualified liquid of a CO2+O2 in-situ leaching mine in Inner Mongolia, China has a uranium concentration of 35.8 g / L, a pH value of 8.3, a pH0 of 5.0, a pH2 of 13.0, and a D0 of 2.0 m. The liquid inlet of the precipitation mother liquor pipeline is 0.3 m higher than the highest interface of the precipitation layer, and the probe of the ultrasonic sludge-water interface instrument is 0.1 m higher than the highest interface of the precipitation layer. Based on this, the specific steps of the control method are as follows:

[0058] The first electromagnetic valve (leaching qualified liquid valve) V1 is opened, the first pipeline pump R1 is started, and the first electromagnetic flowmeter F1 is run. When the first electromagnetic flowmeter F1 monitors the flow to be 0, the first pipeline pump R1 is stopped, the first electromagnetic valve V1 is closed, the first electromagnetic flowmeter F1 is closed, the stirrer J is started, and the pH meter P is run. The second electromagnetic valve (hydrochloric acid valve) V2 is opened, and the second pipeline pump R2 is started. When the pH value of the qualified liquid decreases to 5.0, the second pipeline pump R2 is stopped, and the second electromagnetic valve V2 is closed.

[0059] The solid feeder G is started, and NaOH solid is slowly added. When the pH value of the slurry increases to 13.0, the solid feeder G, the stirrer J, and the pH meter P are stopped. After 12 h of precipitation, the third electromagnetic valve (precipitation mother liquor valve) V3 is opened, the third pipeline pump R3 is started, and the second electromagnetic flowmeter F2 is run. When the second electromagnetic flowmeter F2 shows 0, the third pipeline pump R3 is stopped, the third electromagnetic valve V3 is closed, the second electromagnetic flowmeter F2 is closed, and the ultrasonic sludge-water interface instrument S is started to monitor the thickness of the precipitation layer to be 0.5 m.

[0060] After 4 times of precipitation operation, the thickness of the precipitation layer is 2.0 m. The fourth electromagnetic valve (slurry valve) V4 is opened, the fourth pipeline pump R4 is started, and the third electromagnetic flowmeter F3 is run. When the third electromagnetic flowmeter F3 shows 0, the fourth pipeline pump R4 is stopped, the fourth electromagnetic valve V4 is closed, and the third electromagnetic flowmeter F3 is closed.

[0061] The whole process realizes rapid and accurate automatic control, and the personnel workload is reduced by 20%.

[0062] Example 2.

[0063] The leaching qualified liquid of an acid in-situ leaching mine in Inner Mongolia, China has a uranium concentration of 15.5 g / L, a pH value of 1.6, a set starting acidification leaching qualified liquid pH value pH0 of 4.5, a set ending alkali addition slurry pH value pH2 of 12.5, and a set starting solid-liquid separation precipitation layer thickness D0 of 1.5 m. The liquid inlet of the precipitation mother liquor pipeline is 0.4 m higher than the highest interface of the precipitation layer, and the probe of the ultrasonic sludge-water interface instrument is 0.2 m higher than the highest interface of the precipitation layer.

[0064] Open the first electromagnetic valve V1, start the first pipeline pump R1, and run the first electromagnetic flowmeter F1. When the first electromagnetic flowmeter F1 monitors the flow to be 0, the first pipeline pump R1 stops, the first electromagnetic valve V1 is closed, the first electromagnetic flowmeter F1 is closed, the agitator J is started, and the pH meter P is run.

[0065] Start the solid feeder G and slowly add NaOH solid. When the slurry pH value rises to 12.5, the solid feeder G and the agitator J are stopped, and the pH meter P is closed. After 24 h of precipitation, the third electromagnetic valve V3 is opened, the third pipeline pump R3 is started, and the second electromagnetic flowmeter F2 is run. When the second electromagnetic flowmeter F2 shows 0, the third pipeline pump R3 stops, the third electromagnetic valve V3 is closed, the second electromagnetic flowmeter F2 is closed, and the ultrasonic sludge-water interface instrument S is started to monitor the thickness of the precipitate layer to be 0.2 m.

[0066] After 8 times of precipitation operation, the thickness of the precipitate layer is 1.6 m. The fourth electromagnetic valve V4 is opened, the fourth pipeline pump R4 is started, and the third electromagnetic flowmeter F3 is run. When the third electromagnetic flowmeter F3 shows 0, the fourth pipeline pump R4 stops, the fourth electromagnetic valve V4 is closed, and the third electromagnetic flowmeter F3 is closed.

[0067] The whole process realizes fast and accurate automatic control, and the personnel workload is reduced by 15%.

[0068] Example 3.

[0069] The leaching qualified liquid of a CO2+O2 in-situ leaching mine in Xinjiang, China has a uranium concentration of 26.7 g / L and a pH value of 8.9. The pH value pH0 of the leaching qualified liquid for starting acidification is set to be 4.5, the slurry pH value pH2 for ending alkali addition is set to be 12.0, and the thickness D0 of the precipitate layer for starting solid-liquid separation is set to be 1.8 m. The inlet of the precipitate mother liquor pipeline is 0.3 m higher than the highest interface of the precipitate layer, and the probe of the ultrasonic sludge-water interface instrument is 0.2 m higher than the highest interface of the precipitate layer.

[0070] Open the first electromagnetic valve V1, start the first pipeline pump R1, and run the first electromagnetic flowmeter F1. When the first electromagnetic flowmeter F1 monitors the flow to be 0, the first pipeline pump R1 stops, the first electromagnetic valve V1 is closed, the first electromagnetic flowmeter F1 is closed, the agitator J is started, and the pH meter P is run. Open the second electromagnetic valve V2, and start the second pipeline pump R2. When the pH value of the qualified liquid decreases to 4.5, the second pipeline pump R2 stops, and the second electromagnetic valve V2 is closed.

[0071] The solid feeder G is started, and the solid NaOH is slowly added. When the pH value of the slurry is increased to 12.0, the solid feeder G, the agitator J are stopped, and the pH meter P is closed. After the precipitation for 36 hours, the third electromagnetic valve V3 is opened, the third pipeline pump R3 is started, and the second electromagnetic flow meter F2 is operated. When the second electromagnetic flow meter F2 shows 0, the third pipeline pump R3 is stopped, the third electromagnetic valve V3 is closed, the second electromagnetic flow meter F2 is closed, and the ultrasonic sludge-water interface instrument S is started to monitor the thickness of the precipitate layer as 0.3 m.

[0072] After the 6-time precipitation operation, the thickness of the precipitate layer is 1.9 m. The fourth electromagnetic valve V4 is opened, the fourth pipeline pump R4 is started, and the third electromagnetic flow meter F3 is operated. When the third electromagnetic flow meter F3 shows 0, the fourth pipeline pump R4 is stopped, the fourth electromagnetic valve V4 is closed, and the third electromagnetic flow meter F3 is closed.

[0073] The whole process realizes the fast and accurate automatic control, and the personnel workload is reduced by 18%.

[0074] In summary, the present application has the following advantages compared with the prior art:

[0075] (1) The present application realizes the on-line monitoring of the parameters such as flow, pH value and thickness of the precipitate layer through the monitoring equipment.

[0076] (2) The present application realizes the automatic control according to the monitoring results of the key parameters in the alkali precipitation process, improves the control precision of the process parameters, and reduces the personnel workload.

[0077] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts of each embodiment can be referred to each other. For the system disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0078] The principles and implementation manners of the present application are described by using specific examples in this paper. The above embodiment description is only used to help understand the method of the present application and its core idea; meanwhile, for the general technical personnel in the art, the specific implementation manner and application range can be changed according to the idea of the present application. In summary, the content of the specification should not be understood as the limitation of the present application.

Claims

1. A control device for adding alkali to precipitate qualified uranium leaching solution obtained from in-situ leaching, wherein the device is installed on a precipitation assembly, characterized in that, The control device includes monitoring components, control components, and a PLC controller; Both the monitoring component and the control component are mounted on the sedimentation component; both the monitoring component and the control component are connected to the PLC controller. The monitoring component is used to collect the flow rate of the qualified rinsing solution, pH value, flow rate of the mother liquor, and thickness of the sedimentation layer in the sedimentation component. The PLC controller is used to determine the addition adjustment command of the qualified rinsing liquid based on the flow rate value of the qualified rinsing liquid, to determine the addition adjustment command of the acidic liquid, the addition adjustment command of the solid liquid and the sedimentation and settling command based on the pH value, to determine the discharge adjustment command of the sedimentation mother liquor based on the flow rate value of the sedimentation mother liquor, and to determine the slurry discharge adjustment command based on the sedimentation layer thickness value. The control component is used to control the flow rate of the qualified rinsing liquid fed into the sedimentation component according to the qualified rinsing liquid addition adjustment command, control the flow rate of the acidic liquid fed into the sedimentation component according to the acidic liquid addition adjustment command, control the mass of the solid fed into the sedimentation component according to the solid addition adjustment command, control the settling time of the slurry in the sedimentation component according to the sedimentation settling command, control the flow rate of the sedimentation mother liquor discharged from the sedimentation component according to the sedimentation mother liquor discharge adjustment command, and control the flow rate of the slurry discharged from the sedimentation component according to the slurry discharge adjustment command. The sedimentation assembly includes a qualified rinsing solution pipeline, a hydrochloric acid pipeline, a mother liquor sedimentation pipeline, a slurry pipeline, and a sedimentation tank; the qualified rinsing solution pipeline, the hydrochloric acid pipeline, the mother liquor sedimentation pipeline, and the slurry pipeline are all connected to the sedimentation tank; the control assembly includes a first pipeline pump, a first solenoid valve, a stirrer, a second pipeline pump, a second solenoid valve, a solid feeder, a third pipeline pump, a third solenoid valve, a fourth pipeline pump, and a fourth solenoid valve; the first pipeline pump and the first solenoid valve are both located on the qualified rinsing solution pipeline; the second pipeline pump and the second solenoid valve are both located on the hydrochloric acid pipeline; the third pipeline pump and the third solenoid valve are both located on the mother liquor sedimentation pipeline; the fourth pipeline pump and the fourth solenoid valve are both located on the slurry pipeline; the solid feeder and the stirrer are located at the top of the sedimentation tank.

2. The control device for adding alkali to the qualified uranium leaching solution according to claim 1, characterized in that, The monitoring components include a pH meter, a first electromagnetic flow meter, a second electromagnetic flow meter, a third electromagnetic flow meter, and an ultrasonic mud-water interface meter. The pH meter is installed inside the sedimentation tank; the ultrasonic mud-water interface meter is installed at the top of the sedimentation tank. The first electromagnetic flow meter is installed on the qualified rinsing liquid pipeline; the second electromagnetic flow meter is installed on the sediment mother liquor pipeline; and the third electromagnetic flow meter is installed on the slurry pipeline.

3. A method for controlling the addition of alkali to precipitate in qualified uranium leaching solution obtained from in-situ leaching, applied to the control device for adding alkali to precipitate in qualified uranium leaching solution obtained from in-situ leaching as described in any one of claims 1-2, characterized in that, The methods include: Collect the flow rate of qualified rinsing solution, pH value, flow rate of mother liquor, and thickness of sediment layer in the sedimentation component; Based on the qualified rinsing liquid flow rate, a qualified rinsing liquid addition adjustment instruction is determined; based on the pH value, an acidic liquid addition adjustment instruction, a solid addition adjustment instruction, and a sedimentation settling instruction are determined; based on the sedimentation mother liquor flow rate, a sedimentation mother liquor discharge adjustment instruction is determined; and based on the sedimentation layer thickness value, a slurry discharge adjustment instruction is determined. The flow rate of the qualified rinsing liquid fed into the sedimentation assembly is controlled according to the qualified rinsing liquid addition adjustment command, the flow rate of the acidic liquid fed into the sedimentation assembly is controlled according to the acidic liquid addition adjustment command, the mass of the solid fed into the sedimentation assembly is controlled according to the solid addition adjustment command, the sedimentation time of the slurry in the sedimentation assembly is controlled according to the sedimentation settling command, the flow rate of the sedimentation mother liquor discharged from the sedimentation assembly is controlled according to the sedimentation mother liquor discharge adjustment command, and the flow rate of the slurry discharged from the sedimentation assembly is controlled according to the slurry discharge adjustment command.

4. The method for controlling the precipitation of qualified uranium leaching solution by adding alkali according to claim 3, characterized in that, The rinsing fluid addition adjustment command is determined based on the qualified rinsing fluid flow rate value, specifically including: When the flow rate of the qualified rinsing solution is not zero, a first qualified rinsing solution addition adjustment command is generated; the first qualified rinsing solution addition adjustment command is used to indicate that qualified rinsing solution is fed into the sedimentation component. When the flow rate of the qualified rinsing solution is zero, a second qualified rinsing solution addition adjustment command is generated; the second qualified rinsing solution addition adjustment command is used to indicate that the qualified rinsing solution is stopped from being fed into the sedimentation component.

5. The method for controlling the precipitation of qualified uranium leaching solution by adding alkali according to claim 3, characterized in that, Based on the pH value, the instructions for adjusting the dosage of acidic liquid, solid, and sedimentation are determined, specifically including: When the pH value is greater than or equal to the preset acidic pH value, a first acidic liquid addition adjustment command and a first solid addition adjustment command are generated; the first acidic liquid addition adjustment command is used to indicate that acidic liquid is fed into the precipitation component, and the first solid addition adjustment command is used to indicate that solid is stopped being fed into the precipitation component. When the pH value is less than a preset acidic pH value, or when the pH value is less than a preset alkaline pH value, a second acidic liquid addition adjustment command and a second solid addition adjustment command are generated; the second acidic liquid addition adjustment command is used to indicate that the acidic liquid is stopped from being fed into the precipitation component, and the second solid addition adjustment command is used to indicate that solid is being fed into the precipitation component. When the pH value is greater than or equal to the preset alkaline pH value, the second acidic liquid addition adjustment command, the first solid addition adjustment command, and the precipitation settling command are generated.

6. The method for controlling the precipitation of qualified uranium leaching solution by adding alkali according to claim 3, characterized in that, The precipitation mother liquor discharge adjustment command is determined based on the aforementioned precipitation mother liquor flow rate value, specifically including: When the flow rate of the precipitated mother liquor is not zero, a first precipitated mother liquor discharge adjustment command is generated; the first precipitated mother liquor discharge adjustment command is used to indicate the discharge of precipitated mother liquor from the precipitating component; When the flow rate of the precipitated mother liquor is zero, a second precipitated mother liquor discharge adjustment command is generated; the second precipitated mother liquor discharge adjustment command is used to indicate that the precipitated mother liquor is stopped from being discharged from the precipitating component.

7. The method for controlling the precipitation of qualified uranium leaching solution by adding alkali according to claim 3, characterized in that, The slurry discharge adjustment command is determined based on the sedimentation layer thickness value, specifically including: generating a slurry discharge adjustment command when the sedimentation layer thickness value is greater than or equal to a preset thickness value.

8. The method for controlling the precipitation of qualified uranium leaching solution by adding alkali according to claim 5, characterized in that, The preset acidic pH value ranges from 4.5 to 5.0; the preset alkaline pH value ranges from 12 to 13.

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