pH value control device and method for chemical combination tank for EMD continuous leaching process

Abstract

The invention provides a pH value control device and method for a chemical combination tank for an EMD continuous leaching process, and relates to the field of industrial automatic control. The pH value control device comprises a PLC control system, an operation panel, four online pH instruments, three electromagnetic valves, a sampling pump and three regulating valves. The set pH control value, the sampling time interval and the control parameter of the chemical combination tank are input through the operation panel, a CPU module of the PLC control system obtains the current real-time pH value of the chemical combination tank through an analog quantity input module, then a control value is obtained through PID calculation and transmitted to the regulating valves through an analog quantity output module, the regulating valves control the opening degrees of the valves according to the control value, the slurrying feed quantity is controlled, and thus stable control over the pH value of the chemical combination tank is achieved. By adoption of the pH value control device and method for the chemical combination tank for the EMD continuous leaching process, online automatic pH value acquisition, actual pH value deviation compensation and pH target value correction can be achieved, and the pH value can be adjusted to the optimal range in the production process.

Description

technical field [0001] The invention relates to the field of industrial automation control, in particular to a pH value control device and a control method for a chemical combination tank of an EMD continuous leaching process. Background technique [0002] In the continuous leaching process, there are generally six chemical combination tanks in the leaching section, and the overflow pipes are used to connect the chemical combination tanks in pairs, and the first and last chemical combination tanks are refluxed by pumps. The pH control of each reaction tank is the focus and difficulty of the entire production control. In the compounding process of continuous leaching EMD (EMD is the abbreviation of electrolytic manganese dioxide) production, the process is based on the chemical reaction in the tank. The pH control is divided into three stages, and the pH control of each stage must be ensured within the set range, and the fluctuation of the pH value in each tank must be minimi...

AI Technical Summary

Problems solved by technology

This method has the following problems: 1. There is a time interval between pH value detection and regulation, the lag is large, and the control is unstable, which will cause repeated callbacks; 2. Manual sampling is prone to errors; 3. The site environment in the EMD compounding stage is harsh. Frequent sampling will affect the health of workers; 4. It is not easy to form a production data report, and the production process is not easy to manage, resulting in unstable quality of the final product

There are also some EMD manufacturers in China that use online pH meters to collect and monitor the pH value in chemical engineering in real time, but the control still adopts manual adjustment, and the product quality is greatly affected by human factors and is unstable.

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