A method for producing electrolytic nickel

Abstract

The invention provides a method for producing electrodeposited nickel. Anode liquor generated in the electrodeposition process is used as a raw material. The content of Ni2+ is larger than or equal to 75 g / L, the content of Cu2+ is smaller than 0.001 g / L, the content of Fe2+ is smaller than 0.001 g / L, the content of Co2+ is smaller than 0.001 g / L, the content of Pb2+ is smaller than 0.0002 g / L, and the content of Zn2+ is smaller than 0.0002 g / L. The pH of the anode liquor is made to reach 2.5-3.5 after diffusion and dialysis of special negative ions, so that the anode liquor serving as electrodeposition catholyte enters an electrodeposition tank to produce the high-quality electrodeposited nickel; due to the fact that small granules which are not completely filtered, residual oil and organisms in the electrodeposition catholyte are adsorbed onto a plate surface, purification of the catholyte is achieved to a certain extent, and after acid modulation, a solution meets the production requirement of the electrodeposited Ni9996.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for producing electrolytic nickel. Background technique [0002] At present, the electrolytic nickel manufacturers in the world all use the leaching-insoluble anode diaphragm electrolysis production process in the electrolytic nickel production. The anolyte produced in the electrolytic deposition process is returned to the leaching process as an acidic solution for batching. The anode of the electrowinning process adopts an insoluble anode, so that the metal to be extracted in the electrolyte is deposited and precipitated on the cathode, so as to achieve the purpose of extracting the metal. In the catholyte of nickel electrolysis, in addition to containing H + In addition, it often contains a small amount of metal ions with harmful impurities such as copper, iron, cobalt, and zinc. Although the content of these impurity ions is very low, the standard electrode potential is hig...

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Problems solved by technology

In the catholyte of nickel electrolysis, in addition to containing H + In addition, it often contains a small amount of metal ions such as copper, iron, cobalt, zinc and other harmful impurities. Although the content of these impurity ions is very low, the standard electrode potential is higher than that of Ni 2+ Positive Cu 2+ , Pb 2+ Plasma is prior to the reduction and precipitation of nickel ions, so the anolyte produced by electrowinning can be purified to a certain extent after electrolysis; this process has the following defects: (1) The impurity content of the chemical composition of the anolyte is lower than that of the catholyte, so return to the previous process according to the design process—leaching The batching process is carried out, and the solution produced after leaching is purified and used as catholyte; (2) the anolyte is returned to the previous process for batching, containing 20-25g / L of acid, and a certain amount of industrial sulfuric acid needs to be added during the liquid preparation, which affects the technical and economic indicators. Optimized, the unit consumption of industrial sulfuric acid reaches more than 700Kg / t·Ni

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