Method for control PH value of nickel powder electrolyte

Abstract

The invention discloses a method for controlling the pH value of nickel powder electrolyte, relating to a process method for controlling the acidity and alkalinity of electrolyte in the electrolysis process in the production of electrolytic nickel powder. It is characterized in that the ammonia gas at the outlet of the liquid ammonia bottle is first passed into the buffer tank, and then the pH value is controlled through the flow meter, the check valve, the metal film gas distributor, and the electrolyte. In the method of the invention, an ammonia gas flow metering device is added at the outlet of the liquid ammonia bottle, which can effectively control the flow rate of the ammonia gas at the outlet of the ammonia bottle, control the amount of ammonia entering the electrolyte, and achieve the purpose of adjusting the pH value of the electrolyte. And the ammonia gas passes through the metal film gas distributor to make the gas distribution even, eliminate the large number of bubbles, reduce the waste caused by the overflow of ammonia gas, and improve the on-site operating environment.

Description

technical field [0001] The invention discloses a method for controlling the pH value of nickel powder electrolyte, relating to a process method for controlling the acidity and alkalinity of electrolyte in the electrolysis process in the production of electrolytic nickel powder. Background technique [0002] In the process of producing electrolytic nickel powder by perchloric electrolysis, as the electrolysis process proceeds, the pH value in the electrolyte is gradually decreasing. In order to stabilize the pH value in the solution, liquid ammonia is usually passed into the electrolyte Usually, liquid ammonia is injected 3-4 times every 10 hours during operation. Since the input amount is manually added based on experience, it is difficult to control the input amount of liquid ammonia. Insufficient liquid ammonia feed leads to low pH value, easy hardening of the cathode, and low output; excessive liquid ammonia feed will lead to excessively high pH value, high loose ratio of...

AI Technical Summary

Problems solved by technology

[0002] In the process of producing electrolytic nickel powder by perchloric electrolysis, as the electrolysis process proceeds, the pH value in the electrolyte is gradually decreasing. In order to stabilize the pH value in the solution, liquid ammonia is usually passed into the electrolyte During operation, liquid ammonia is usually injected 3-4 times every 10 hours. Since it is a manual operation, the input amount is added based on experience, and the amount of liquid ammonia input is difficult to control.

Insufficient liquid ammonia feed leads to low pH value, easy hardening of the cathode, and low output; excessive liquid ammonia feed will lead to excessively high pH value, high loose ratio of electrolytic nickel powder, and coarse particle size. Introducing liquid ammonia into the solution will cause a large number of bubbles in the solution to volatilize in the air, and a large amount of ammonia will overflow out of the tank, resulting in worsening working conditions on site and increasing the consumption of liquid ammonia.

Images