Method for treating nickel-cobalt hydroxide

A technology of nickel-cobalt hydroxide and hydrogen peroxide solution, which is applied in the direction of cobalt sulfate, nickel sulfate, process efficiency improvement, etc., can solve the problems of large content, lower nickel recovery rate, and affect the quality of ternary precursor products, etc. Achieve the effect of reducing COD value and improving removal effect

Active Publication Date: 2019-12-10
中冶瑞木新能源科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of using nickel-cobalt hydroxide raw materials to produce ternary precursors mainly includes raw material slurrying-leaching-impurity removal-solid-liquid separation-desiliconization-filtration-extraction-oil removal-ternary synthesis and other processes. When nickel ore transforms to produce nickel-cobalt hydroxide, flocculant is often added, resulting in a large amount of flocculant in nickel-cobalt hydroxide products; and when producing ternary precursors, it will be added in the

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  • Method for treating nickel-cobalt hydroxide
  • Method for treating nickel-cobalt hydroxide
  • Method for treating nickel-cobalt hydroxide

Examples

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Embodiment 1

[0051] Take 100mL of nickel sulfate solution with a pH value of 1.5 as the bottom solution, add 180mL of industrial concentrated sulfuric acid with a mass concentration of 93%, and then put it in a hot water bath at 80°C (for heat preservation, not heating) and stir; add 1100g of nickel Cobalt hydroxide is matured and leached in a high-acid environment, and the reaction time is 1.5 hours to obtain a mature leachate, pH=2.5; then add analytically pure hydrogen peroxide with a mass concentration of 32% for reduction leaching, adjust the pH value, and react for 1.5 hours Dilute with water to obtain a reducing leach solution with pH=5.0; filter to obtain a filter cake containing iron, aluminum, silicon and manganese impurities and a nickel-cobalt sulfate filtrate.

Embodiment 2

[0053] Take 100mL of nickel sulfate solution with a pH value of 1.5 as the bottom solution, add 180mL of industrial concentrated sulfuric acid with a mass concentration of 93%, and then put it in a hot water bath at 80°C (for heat preservation, not heating) and stir; add 1050g of nickel Cobalt hydroxide is matured and leached in a high-acid environment, and the reaction time is 1.5 hours to obtain a mature leachate, pH = 2.3; then add analytically pure hydrogen peroxide with a mass concentration of 32% for reduction leaching, adjust the pH value, and react for 1.5 hours Dilute with water to obtain a reducing leach solution with pH=4.8; filter to obtain a filter cake containing iron, aluminum, silicon and manganese impurities and a nickel-cobalt sulfate filtrate.

Embodiment 3

[0055] Take 100mL of nickel sulfate solution with a pH value of 1.5 as the bottom solution, add 180mL of industrial concentrated sulfuric acid with a mass concentration of 93%, and then put it in a hot water bath at 80°C (for heat preservation, not heating) and stir; add 1150g of nickel Cobalt hydroxide is matured and leached in a high-acid environment, and the reaction time is 1.5 hours to obtain a mature leachate, pH=2.6; then add analytically pure hydrogen peroxide with a mass concentration of 32% for reduction leaching, adjust the pH value, and react for 1.5 hours Dilute with water to obtain a reducing leach solution with pH=4.9; filter to obtain a filter cake containing iron, aluminum, silicon and manganese impurities and a nickel-cobalt sulfate filtrate.

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Abstract

The invention discloses a method for treating nickel-cobalt hydroxide. The method comprises the following steps that (1) curing leaching is carried out on the nickel-cobalt hydroxide by adopting concentrated sulfuric acid and a nickel sulfate solution so as to obtain a cured leaching solution; (2) the cured leaching solution is mixed with a hydrogen peroxide solution for carrying out reduction leaching so as to obtain a reduction leaching solution; and (3) the reduction leaching solution is filtered so as to obtain nickel-cobalt sulfate filtrate and an impurity filter cake, wherein the nickel-cobalt hydroxide is obtained by recovering nickel-cobalt from laterite-nickel ore, and the pH value of the reduction leaching solution is 3 - 5. According to the method for treating the nickel-cobalthydroxide, the consumption of auxiliary materials can be effectively reduce, the production cost is reduced, the recovery rate of nickel is remarkably improved, and a remarkable effect of removing silicon and removing flocculant is achieved; and the silicon content in the finally obtained nickel-cobalt sulfate filtrate is not higher than 40 mg/L, the sodium ion content is not higher than 1.0 g/L,the COD value is not higher than 100 mg/L, and the requirements of producing ternary precursor products can be effectively met.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a method for treating nickel-cobalt hydroxide. Background technique [0002] Laterite nickel ore has become the main ore resource of nickel raw materials due to its advantages of abundant reserves, easy mining and low mining cost. The nickel-cobalt hydroxide produced by the transformation of laterite nickel ore has gradually become the main raw material for the production of ternary precursor products for batteries (such as positive electrode composite materials) because the price is lower than that of nickel raw materials produced by nickel sulfide ore. The process of using nickel-cobalt hydroxide raw materials to produce ternary precursors mainly includes raw material slurrying-leaching-impurity removal-solid-liquid separation-desiliconization-filtration-extraction-oil removal-ternary synthesis and other processes. When nickel ore transforms to produce nickel-cobalt hy...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B7/00C01G53/10C01G51/10
CPCC22B23/043C22B7/007C01G53/10C01G51/10Y02P10/20
Inventor 苏华朱红斌姚瑞竹王庆华王祖龙未立清刘春泽
Owner 中冶瑞木新能源科技有限公司
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