New method for washing chlorine of nickelous hydroxide

Abstract

The invention discloses a new method for washing chlorine of nickelous hydroxide and related equipment of the new method. The method and equipment are used for continuous washing of the nickelous hydroxide and other solid slag. The equipment is cylindrical, a to-be-washed material inlet and a post-washing water overflow outlet are formed in the upper end of the equipment, and a washed material outlet and a washing water inlet are formed in the lower end of the equipment. Materials flow downwards, washing water flows upwards, and then continuous backwashing is achieved. According to the method, the solid nickelous hydroxide is ground and pulpified to be pumped into the to-be-washed material inlet of the slag washing equipment, and meanwhile alkaline water is pumped into the washing water inlet for slag washing. In the existing nickel wet metallurgy, the influence of the electrodeposition of chlorine on nickel sulfate is very large, chlorine can be generated and pollute the environment, and a pole plate can be corroded. Thus, chlorine washing treatment needs to be carried out on the nickelous hydroxide of a finished product with high chlorine content in the front section. According to the new method, the input expense of the equipment can be reduced, the slag washing water amount is reduced, and cost is reduced; and the slag washing effect can be improved, and the nickel-chlorine ratio is increased.

Description

technical field [0001] The invention relates to a slag washing section in the fields of chemical industry, metallurgy, etc., in particular to a new method for washing chlorine with nickel hydroxide and related equipment capable of realizing continuous slag washing. Background technique [0002] In hydrometallurgy, chlorine has a great influence on the electrowinning of nickel sulfate, which will not only produce chlorine gas to pollute the environment, but also corrode the plates. Therefore, it is particularly important to control the chlorine content in the finished nickel hydroxide in its front section. [0003] In the existing slag washing process, the washing of all kinds of solid slag is mostly carried out by means of stirring tank, filter or thickener and equipment, such as filter press CCD countercurrent washing slag. These slag washing methods have the disadvantages of large investment, long process and high operating costs, and it is difficult to achieve the indica...

AI Technical Summary

Problems solved by technology

However, these slag washing methods have disadvantages such as large investment, long process, and high operating costs.

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