Method for purification and impurity removal of nickel liquid

Abstract

The invention relates to a method for the purification and impurity removal of nickel liquid. In the invention, environmental pollution caused by introducing toxic fluoride can be avoided, the technique steps also can be simplified, the yield of nickel, copper and cobalt is enhanced, and waste water generated in the production process does not need to be processed again. In the method, a soluble carbonate solution is added into nickel liquid after iron removal, and Ca<2+> and Mg<2+> are removed in a carbonate precipitation form; the solution after being filtered is controlled at 40 to 90 DEG C, dimethylglyoxime is added by stirring to carry out a nickel precipitation reaction, a filter cake after being filtered is washed by hot water of 40 to 95 DEG C, and a pure nickel chelate complex is obtained; Cu<2+> and Co<2+> are extracted and recovered after nickel precipitation filter liquor and filter liquor after being filtered and washed by the hot water are merged and the dimethylglyoximeis recovered; the nickel chelate complex is dissolved by hydrochloric acid, sulfuric acid or nitric acid and is filtered to obtain a corresponding nickel salt solution and the dimethylglyoxime; after the dimethylglyoxime dissolved in acid soluble filter liquor is recovered, residual Fe<3+> is removed by neutralization, condensation and filtration, and a nickel salt product is obtained after evaporation, crystallization, washing and drying; and the recovered dimethylglyoxime is recycled for a nickel precipitation reaction.

Description

technical field [0001] The invention relates to a method for purifying nickel liquid and removing impurities. Background technique [0002] Nickel is a silver-white ferromagnetic metal, mainly used in the production of stainless steel, high-temperature alloy steel, high-performance special alloys, and nickel-based spraying materials. With the advancement of science and technology, nickel salt and nickel deep-processing products have developed rapidly and are widely used in petroleum catalysts, rechargeable batteries, nickel plating materials and other fields. [0003] The nickel ore that has been mined on land includes nickel sulfide ore, nickel oxide ore and nickel arsenide ore. my country mainly extracts nickel from nickel sulfide ore. China is recognized as one of the countries lacking in nickel resources. With years of nickel sulfide mining, the existing domestic nickel sulfide mines have long been unable to meet the production demand. The decline of ore grade and the ...

AI Technical Summary

Problems solved by technology

[0015] (1) When the nickel solution is purified by using fluoride to remove calcium and magnesium, F will be introduced - , wastewater must be treated to remove F- before it can be discharged, which increases the difficulty of wastewater treatment

[0016] (2) Toxic substances are required for sulfide copper precipitation and chlorine gas oxidation to remove cobalt, and there are certain safety hazards

Due to the loss of nickel (copper slag, cobalt slag) in each impurity removal process, the nickel yield is low, and the copper slag and cobalt slag need to be treated again to recover nickel

Extraction requires multi-stage extraction and stripping, the process is too cumbersome and the investment in equipment is large

[0017] (3) in Ni 2+ with NH 4 + In the separation process, adding alkali to distill ammonia not only consumes a lot of alkali and heat energy, but also requires a lot of equipment investment in the process of recovery and recycling of the escaped ammonia gas, and there are safety hazards at the same time

[0018] (4) with Na + 、K + The separation of easily soluble ions or mixed acid system requires extraction or sulfuration precipitation, and the process is cumbersome

At the same time, it is difficult to make Ni in the wastewater after nickel extraction 2+ The content meets the national discharge standard, and it needs to be treated again before it can be discharged