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Method for preparing nickel sulfate from cobalt nickel hydroxide

A technology of nickel-cobalt hydroxide and nickel sulfate, applied in the field of hydrometallurgy, can solve the problems of large flow rate of nickel-cobalt separation system, extraction and impurity removal, complicated process flow, etc., so as to reduce equipment investment and occupation, reduce system and simplify preparation. The effect of the process

Pending Publication Date: 2021-01-12
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to provide a kind of method that nickel hydroxide cobalt prepares nickel sulfate, to solve the extraction impurity removal and nickel cobalt separation system flow that exists when nickel hydroxide cobalt intermediate product is prepared nickel sulfate product in the prior art is huge, process cumbersome process, etc.

Method used

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  • Method for preparing nickel sulfate from cobalt nickel hydroxide
  • Method for preparing nickel sulfate from cobalt nickel hydroxide
  • Method for preparing nickel sulfate from cobalt nickel hydroxide

Examples

Experimental program
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Effect test

Embodiment 1

[0042] MHP nickel-cobalt hydroxide is used as the raw material, its water content is 60%, the dry basis contains 40% nickel, 3.5% cobalt and 6% manganese.

[0043] Atmospheric pressure leaching is adopted, the temperature is 80°C, the leaching time is 2h, the pH is controlled at 2.0, the liquid-solid ratio is 8:1, and the amount of sulfur dioxide introduced is 0.8 times the molar amount of manganese in the system.

[0044] The nickel leaching rate is 99.8%, the cobalt leaching rate is 99.8%, and the manganese leaching rate is 95%.

[0045] Afterwards, pure oxygen is introduced as an oxidant, sodium metabisulfite is added as a catalyst, wherein the catalyst accounts for 5% of the dry weight of the raw material, nickel carbonate is used as a neutralizer, the reaction temperature is 60°C, the leaching time is 10h, the pH is controlled at 4.0, and the liquid-solid ratio is 8: 1.

[0046] The cobalt precipitation rate is 99.9%, and the manganese precipitation rate is 99.5%. The ni...

Embodiment 2

[0050] MHP nickel-cobalt hydroxide is used as the raw material, its water content is 60%, the dry basis contains 40% nickel, 3.5% cobalt and 6% manganese.

[0051] Using 0.4MPa pressure leaching, the temperature is 150°C, the leaching time is 2h, the pH is controlled at 2.0, the liquid-solid ratio is 8:1, and sulfur dioxide is introduced, which is 0.8 times the molar amount of manganese in the system.

[0052] The nickel leaching rate is 99.9%, the cobalt leaching rate is 99.9%, and the manganese leaching rate is 99%.

[0053] Afterwards, pure oxygen is introduced as an oxidant, sodium metabisulfite is added as a catalyst, wherein the catalyst accounts for 5% of the dry weight of the raw material, nickel carbonate is used as a neutralizer, the reaction temperature is 60°C, the leaching time is 10h, the pH is controlled at 4.0, and the liquid-solid ratio is 8: 1.

[0054] The cobalt precipitation rate is 99.9%, and the manganese precipitation rate is 99.5%. The nickel sulfate ...

Embodiment 3

[0058] MHP nickel-cobalt hydroxide is used as the raw material, its water content is 60%, the dry basis contains 40% nickel, 3.5% cobalt and 6% manganese.

[0059] Atmospheric pressure leaching is adopted, the temperature is 80°C, the leaching time is 0.5h, the pH is controlled at 2.0, the liquid-solid ratio is 8:1, and sulfur dioxide is introduced, which is 0.8 times the molar amount of manganese in the system.

[0060] The nickel leaching rate is 99.5%, the cobalt leaching rate is 99.2%, and the manganese leaching rate is 91%.

[0061] Afterwards, pure oxygen is introduced as an oxidant, sodium metabisulfite is added as a catalyst, wherein the catalyst accounts for 5% of the dry weight of the raw material, nickel carbonate is used as a neutralizer, the reaction temperature is 60°C, the leaching time is 10h, the pH is controlled at 4.0, and the liquid-solid ratio is 8: 1.

[0062] The cobalt precipitation rate is 99.9%, and the manganese precipitation rate is 99.5%. The nick...

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Abstract

The invention provides a method for preparing nickel sulfate from cobalt nickel hydroxide. The cobalt nickel hydroxide contains manganese impurity, iron impurity, scandium impurity, aluminum impurityand chromium impurity. The method comprises the steps that S1, the cobalt nickel hydroxide is subjected to reduction acid solution leaching under the effect of sulfuric acid and a reducing agent, andleachate is obtained; S2, a catalyst, an oxidizing agent and a neutralizing agent are added into the leachate, so that a catalytic oxidation reaction and a neutralization reaction are conducted at thesame time, and a first impurity removal solution is obtained; And S3, extraction impurity removal is conducted on the first impurity removal solution, and evaporative crystallization is conducted toobtain the nickel sulfate. The method effectively simplifies the preparation working procedure of the nickel sulfate, the equipment investment and land occupation are reduced, and the method is very suitable for industrial large-scale application.

Description

technical field [0001] The invention relates to the technical field of hydrometallurgy, in particular to a method for preparing nickel sulfate from nickel cobalt hydroxide. Background technique [0002] At present, the hydrometallurgy of laterite nickel ore produces a large amount of MHP, that is, the intermediate product of nickel cobalt hydroxide. In order to obtain the final product nickel sulfate, the intermediate product of nickel cobalt hydroxide is often leached-removed-extracted in the existing process. Impurity removal—separation of nickel and cobalt and a series of treatment procedures to remove cobalt elements and impurity elements such as manganese, iron, scandium, aluminum and chromium to obtain nickel sulfate solution. [0003] However, the separation of nickel and cobalt needs to be in a solution system, such as P204 is used to separate impurities such as manganese, P507 extractant is used to extract cobalt, and nickel remains in the raffinate. In this proces...

Claims

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Application Information

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IPC IPC(8): C22B23/00C22B3/08C22B3/44C22B3/38
CPCC22B23/043C22B23/0461C22B3/08C22B3/44C22B3/3846
Inventor 孙宁磊刘诚李诺殷书岩戴江洪林洁媛李勇彭建华
Owner CHINA ENFI ENGINEERING CORPORATION
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