Device for controlling acidity of electrodeposition solution and method thereof

Abstract

The invention discloses a device for controlling the acidity of an electrodeposition solution and a method thereof. The device comprises an electrodeposition tank, a residual solution pipeline, a residual solution tank, a nitrogen gas pipeline group and a nitrogen gas storing tank; the electrodeposition tank communicates with the residual solution tank through the residual solution pipeline; the residual solution pipeline communicates with the nitrogen gas storing tank through the nitrogen gas pipeline group; and the nitrogen gas pipeline group is used for introducing nitrogen gas into the residual solution pipeline to extrude out chlorine gas in electrodeposition residual solution. According to the device for controlling the acidity of the electrodeposition solution and the method thereof, the chlorine gas in the residual solution is extruded out through a nitrogen gas explosion method, the content of the chlorine gas in the residual solution is controlled by controlling the introduced nitrogen gas amount, then the acidity of the electrodeposition residual solution is controlled, and the acidity of the electrodeposition residual solution meets the requirement; and in addition, theintroduced nitrogen gas can quickly bring out produced hydrogen gas, the gas volume in the system is increased as introduction of the nitrogen gas, the diluting effect on the concentration of the produced hydrogen gas can be achieved, therefore, the concentration of hydrogen ions produced through hydrogen explosion is decreased, and then the hydrogen explosion generation risk is reduced.

Description

technical field [0001] The invention belongs to the technical field of acidity control of electrowinning solution, and in particular relates to a device and method for controlling the acidity of electrowinning solution. Background technique [0002] In the production process of electrowinning cobalt, the acidity range of the electrowinning solution is very strict, usually requiring an acidity of 0.03 to 0.07 mol / L. When the acidity is lower than 0.03 mol / L, cobalt ions are easily hydrolyzed to form "anode slime". Anode mud is easy to adhere to the cathode plate, that is, the cobalt plate, causing the cobalt plate to grow “tumor”, “shell delamination”, dark color, and content drop. bright. [0003] However, when the acidity is higher than 0.07mol / L, hydrogen ions in the solution are also electro-deposited during the cobalt electrowinning process to generate hydrogen gas. When the hydrogen gas reaches the minimum concentration of "explosion" in the pipeline, a "hydrogen explo...

AI Technical Summary

Problems solved by technology

[0003] However, when the acidity is higher than 0.07mol / L, hydrogen ions in the solution are also electro-deposited during the cobalt electrowinning process to generate hydrogen gas. When the hydrogen gas reaches the minimum concentration of "explosion" in the pipeline, a "hydrogen explosion" will occur. Then the solution pipeline will burst, and the solution storage tank and electrolyzer will burst

Images