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A method for processing nickel-cobalt hydroxide

A technology of nickel-cobalt hydroxide and hydrogen peroxide solution, applied in the direction of cobalt sulfate, nickel sulfate, process efficiency improvement, etc., can solve the problems of nickel precipitation, reducing nickel recovery rate, affecting the quality of ternary precursor products, etc.

Active Publication Date: 2022-04-22
中冶瑞木新能源科技有限公司
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  • Summary
  • 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 leaching process of nickel-cobalt hydroxide A large amount of reducing agent sodium pyrosulfite leads to high concentrations of COD and sodium ions in the pre-extraction solution, seriously affecting the quality of the ternary precursor product; at the same time, in order to remove aluminum in the process, the pH value of the solution in the impurity removal process will be adjusted to 5.0~ 5.2 or higher, resulting in a large amount of nickel precipitation, reducing the recovery rate of nickel

Method used

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  • A method for processing nickel-cobalt hydroxide
  • A method for processing nickel-cobalt hydroxide
  • A method for processing nickel-cobalt hydroxide

Examples

Experimental program
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Effect test

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 was matured and leached in a high-acid environment, and the reaction time was 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: (1) using concentrated sulfuric acid and nickel sulfate solution to mature and leach nickel-cobalt hydroxide so as to obtain a mature leachate; (2) mixing the mature leachate and hydrogen peroxide solution for reduction leaching to obtain a reduced Leaching solution; (3) filtering the reducing leaching solution to obtain nickel-cobalt sulfate filtrate and impurity filter cake, wherein the nickel-cobalt hydroxide is obtained by reclaiming nickel-cobalt from laterite nickel ore, and the reducing leaching solution The pH value is 3-5. This method can not only effectively reduce the consumption of auxiliary materials, reduce production costs, and significantly increase the recovery rate of nickel, but also has a remarkable effect of desiliconization and removal of flocculants, and the silicon content in the finally obtained nickel-cobalt sulfate filtrate is not higher than 40mg / L, and the sodium The ion content is not higher than 1.0g / L, and the COD value is not higher than 100mg / L, which can effectively meet the requirements for the production of ternary precursor products.

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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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/00C22B7/00C01G53/10C01G51/10
CPCC22B23/043C22B7/007C01G53/10C01G51/10Y02P10/20
Inventor 苏华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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