PH (potential of hydrogen) control device and control method for deironing in hydrometallurgy

Abstract

The invention discloses a pH control device and method for deironing in hydrometallurgy, and relates to the technical field of hydrometallurgy, the pH control device comprises a pH meter I, a controller, a flow meter, a regulating valve, a pH meter II, a mixing box, a drainage groove, a liquid conveying pipe I, a liquid conveying pipe II, a reaction tank I, a reaction tank II, a reaction tank III and a liquid adding pipeline; the controller is matched with the adjusting valve and the flow meter to adjust the opening degree of the nickel carbonate slurrying liquid valve in real time, the flow of the nickel carbonate slurrying liquid is adjusted according to the change value of the pH value measuring point and the change ratio set value of the flow of the nickel carbonate slurrying liquid and the anolyte by means of an automatic control technical means, the labor intensity of operators is reduced, and the working efficiency is improved. The field safety is improved, and the production efficiency and the technological process control level are improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydrometallurgy, and more particularly to a pH control device and a control method for hydrometallurgical iron removal. Background Art

[0002] A pH meter is installed in the iron removal system during the hydrometallurgical process, and the operator manually adjusts the valve of the nickel carbonate slurry through the data displayed in the central control room or on-site instruments. However, the temperature of the iron removal solution itself is relatively high, and the iron slag containing iron hydroxide colloid in the solution is easy to adhere to the surface of the pH electrode, resulting in the inability of the pH meter to measure accurately. The current operating method is to take samples from the outlet chute of the first reaction tank, use pH test paper to manually measure the pH, and manually adjust the valve of the nickel carbonate slurry according to the test results of the test paper. The main problems are as follows: the iron removal pH value is detected by manual test paper, the detection is delayed, and the error is large; the addition of nickel carbonate slurry is adjusted by manual experience, the operation intensity is high, and it is easy to cause pH fluctuations in the iron removal process.

[0003] In summary, during the operation of the existing iron removal system, there are problems with important process parameters such as pH potential value, nickel carbonate slurry flow rate, anode liquid flow rate, etc., which are manually controlled and operated based on human experience, resulting in poor on-site control accuracy, high labor intensity, and difficult to control on-site safety. Summary of the invention

[0004] The purpose of the present invention is: in order to solve the above-mentioned technical problems, the present invention provides a pH control device and control method for hydrometallurgical iron removal, which can realize automatic control of the iron removal process, reduce the number of employee inspections, improve production efficiency and process control level, and improve on-site safety.

[0005] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0006] A pH control device for hydrometallurgical iron removal, comprising a pH meter, a controller, a flow meter, a regulating valve, a pH meter, a mixing box, a drainage trough, a first infusion tube, a second infusion tube, a first reaction tank, a second reaction tank, a third reaction tank, and a liquid adding pipeline;

[0007] The outlets of the drainage trough and the liquid adding pipeline are connected to the inlet of the mixing box, the outlet of the mixing box is connected to the reaction tank 1 through a pipeline, and the reaction tank 1, the reaction tank 2 and the reaction tank 3 are connected in sequence through pipelines;

[0008] The pH meter 1 is installed at the outlet of the reaction tank 1, the pH meter 2 is installed on the drainage trough, the flow meter and the regulating valve are installed on the liquid adding pipeline, and the regulating valve is located between the flow meter and the mixing box; the signal output ends of the pH meter 1, the pH meter 2, and the flow meter are all connected to the signal receiving end of the controller, and the signal output end of the controller is connected to the signal receiving end of the regulating valve.

[0009] Furthermore, the infusion pipeline 1 and the infusion pipeline 2 are both connected to the inlet of the drainage trough.

[0010] Furthermore, the pH meter 1 is a post-reaction measurement point, and the pH meter 2 is a pre-reaction measurement point.

[0011] Furthermore, the mixing box is made of steel-lined PTFE material.

[0012] Furthermore, the regulating valve is a pneumatic or electric regulating valve, and the valve core is a ball valve, butterfly valve or other structure.

[0013] Furthermore, the flow meter is an electromagnetic flow meter, a mass flow meter, etc.

[0014] Furthermore, the controller is an embedded controller, a micro PLC, a PC, etc.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The controller cooperates with the flow meter and regulating valve to accurately control the flow of nickel carbonate slurry and the flow of external liquid, providing stable reaction conditions for the subsequent process. The multivariable advanced controller control algorithm can be used to adjust the valve opening of nickel carbonate slurry in real time to achieve the potential control target required by the process, stabilize the production process, improve production efficiency, and reduce raw material consumption.

[0017] 2. Through automatic control means, continuous measurement and automatic control of the iron removal process can be achieved, reducing the labor intensity of operators and improving on-site safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the system structure of the present invention.

[0019] Figure numerals: 1. pH meter 1; 2. Controller; 3. Flow meter; 4. Regulating valve; 5. pH meter 2; 6. Mixing box; 7. Drainage trough; 8. Infusion tube 1; 9. Infusion tube 2; 10. Reaction tank 1; 11. Reaction tank 2; 12. Reaction tank 3; 13. Liquid adding pipeline. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0021] See also Figure 1 , the present invention provides the following technical solutions:

[0022] A pH control device for hydrometallurgical iron removal, comprising a pH meter 1, a controller 2, a flow meter 3, a regulating valve 4, a pH meter 2 5, a mixing box 6, a drainage trough 7, a liquid infusion tube 1 8, a liquid infusion tube 2 9, a reaction tank 1 10, a reaction tank 2 11, a reaction tank 3 12, and a liquid adding pipeline 13;

[0023] The outlets of the drainage trough 7 and the liquid adding pipeline 13 are connected to the inlet of the mixing box 6, the outlet of the mixing box 6 is connected to the reaction tank 10 through a pipeline, and the reaction tank 10, the reaction tank 112 and the reaction tank 3 12 are connected in sequence through pipelines;

[0024] pH meter 1 is installed at the outlet of reaction tank 10, pH meter 2 5 is installed on drainage trough 7, flow meter 3 and regulating valve 4 are installed on liquid adding pipeline 13, and regulating valve 4 is located between flow meter 3 and mixing box 6; signal output ends of pH meter 1, pH meter 2 5 and flow meter 3 are all connected to signal receiving ends of controller 2, and signal output end of controller 2 is connected to signal receiving end of regulating valve 4.

[0025] In this embodiment: pH meter 1 and pH meter 2 5 respectively detect the pH value of the liquid after and before the reaction, the flow meter 3 and the regulating valve 4 are used to adjust the flow rate of the liquid in the liquid adding pipeline 13, and the controller 2 receives the numerical signals of pH meter 1 and pH meter 2 5, and then transmits the control signal to the regulating valve 4.

[0026] A control method for a pH control device for hydrometallurgical iron removal:

[0027] (1) Measuring pH value: pH meter 1 is installed at the outlet of reaction tank 10, and detects the pH value of the liquid at the outlet of reaction tank 10 and transmits it to controller 2. pH meter 2 5 is installed on the drainage trough, and detects the pH value of the foreign liquid in infusion line 1 8 and infusion line 2 9 and transmits it to the controller;

[0028] (2) Measuring flow rate: measuring the flow rate of nickel carbonate slurry by flow meter 3;

[0029] (3) Controlling flow: After receiving the pH values ​​from pH meter 1 and pH meter 2 5 and the flow rate of nickel carbonate slurry, the controller controls the flow rate of nickel carbonate slurry, the flow rate of external liquid and the pH value at the outlet of the iron removal tank through regulating valve 4 to form a ratio regulation loop. The control loop regulates the flow rate of nickel carbonate slurry solution according to the change value of the pH value measuring point and the variable ratio set value of the flow rate of nickel carbonate slurry and external liquid.

[0030] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A pH control device for hydrometallurgical iron removal, characterized in that: It comprises a pH meter 1 (1), a controller (2), a flow meter (3), a regulating valve (4), a pH meter 2 (5), a mixing box (6), a drainage trough (7), a first infusion tube (8), a second infusion tube (9), a first reaction tank (10), a second reaction tank (11), a third reaction tank (12), and a liquid adding pipeline (13); The outlets of the drainage trough (7) and the liquid adding pipeline (13) are connected to the inlet of the mixing box (6), the outlet of the mixing box (6) is connected to the reaction tank 1 (10) through a pipeline, and the reaction tank 1 (10), the reaction tank 2 (11) and the reaction tank 3 (12) are connected in sequence through pipelines; The pH meter 1 (1) is installed at the outlet of the reaction tank 1 (10), the pH meter 2 (5) is installed on the drainage trough (7), the flow meter (3) and the regulating valve (4) are both installed on the liquid adding pipeline (13), and the regulating valve (4) is located between the flow meter (3) and the mixing box (6); the signal output ends of the pH meter 1 (1), the pH meter 2 (5) and the flow meter (3) are all signal-connected to the signal receiving end of the controller (2), and the signal output end of the controller (2) is signal-connected to the signal receiving end of the regulating valve (4).

2. A pH control device for hydrometallurgical iron removal according to claim 1, characterized in that: The infusion pipeline 1 (8) and the infusion pipeline 2 (9) are both connected to the inlet of the drainage trough (7).

3. A pH control device for hydrometallurgical iron removal according to claim 1, characterized in that: The pH meter one (1) is the measurement point after the reaction, and the pH meter two (2) is the measurement point before the reaction.

4. A pH control device for hydrometallurgical iron removal according to claim 1, characterized in that: The mixing box is made of steel-lined PTFE material.

5. A control method for a pH control device for hydrometallurgical iron removal, characterized in that: The following steps are involved: Step 1: Measure pH value: pH meter 1 (1) is installed at the outlet of reaction tank 1 (10), detects the pH value of the liquid at the outlet of reaction tank 1 (10) and transmits it to controller (2); pH meter 2 (5) is installed on the drainage trough, detects the pH value of the external liquid in infusion line 1 (8) and infusion line 2 (9) and transmits it to controller; Step 2: Measuring flow rate: measuring the flow rate of nickel carbonate slurry by means of a flow meter (3); Step 3: Control flow: After receiving the pH values ​​of pH meter 1 (1) and pH meter 2 (5) and the flow rate of nickel carbonate slurry, the controller controls the flow rate of nickel carbonate slurry, the flow rate of external liquid and the pH value at the outlet of the iron removal tank through the regulating valve (4) to form a ratio regulation loop.

6. The control method of a pH control device for hydrometallurgical iron removal according to claim 5, characterized in that: In step three, the target flow value of the nickel carbonate slurry is set in the controller according to the change value of the pH value measuring point and the ratio of the flow rate of the nickel carbonate slurry and the external liquid.

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