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Cobalt powder preparation method

A technology of cobalt powder and lithium cobalt paper, which is applied in the field of chemical raw material production, can solve problems such as the impact on the health of workers, the increase in the amount of sulfuric acid, and the increase in production costs, and achieve the effects of high hardness, reduced production costs, and high compressive strength

Active Publication Date: 2014-10-29
宁波雁门化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the alkali dissolution process in the production and preparation process, because liquid caustic soda remains in the cobalt slag, in the acid dissolution, the amount of sulfuric acid increases, and the production cost increases; and, in the acid dissolution, because the insoluble cobalt However, in the general production process, the reducing agent is sulfur dioxide, which is a poisonous gas, which brings air pollution and affects the health of workers.

Method used

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preparation example Construction

[0022] A kind of preparation method of cobalt powder is provided in the embodiment of the present invention, comprises the following steps:

[0023] (a), add sulfuric acid in lithium cobalt paper and carry out acidolysis, obtain cobalt sulfate solution;

[0024] (b), adjusting the pH value of the cobalt sulfate solution to 1-3, and then removing copper impurities;

[0025] (c), add the cobalt sulfate solution that removes copper impurity into hydrogen peroxide, then adjust the pH value to 2-5, press filter to remove impurities, and obtain a purified cobalt sulfate solution;

[0026] (d), purify the cobalt sulfate solution of purification, and react to make cobalt nitrate solution;

[0027] (e), heating and stirring the cobalt nitrate solution, and adding ammonium carbonate, and obtaining cobalt carbonate precipitation after the reaction;

[0028] (f) After the cobalt carbonate is dried, it is roasted in a hydrogen reduction system. The temperature of the roasting is 400-600°...

Embodiment 1

[0062] The preparation method of cobalt powder comprises the following steps:

[0063] (a), add sulfuric acid to lithium cobalt paper, the mass ratio of lithium cobalt paper and sulfuric acid is 1:0.5, acidolysis obtains cobalt sulfate solution; Pass cobalt sulfate solution through filter press, add sulfuric acid again in filter residue, filter residue and sulfuric acid The ratio is 1:2;

[0064] (b), adding mass percentage is 6% soda ash solution as neutralizer, the cobalt sulfate solution is adjusted to pH value to 1, then the cobalt sulfate solution is passed through the copper extraction box, removes copper impurity;

[0065] (c), the cobalt sulfate solution that removes copper impurity is added hydrogen peroxide, the addition of hydrogen peroxide is that the cobalt sulfate solution of every cubic meter adds 0.08kg hydrogen peroxide, then adding mass percent is 6% soda ash solution, adjusts pH value to 2, presses Impurities are removed by filtration to obtain purified cob...

Embodiment 2

[0073] The preparation method of cobalt powder comprises the following steps:

[0074] (a), add sulfuric acid to lithium cobalt paper, the mass ratio of lithium cobalt paper and sulfuric acid is 1:4, acidolysis obtains cobalt sulfate solution; Pass cobalt sulfate solution through filter press, add sulfuric acid again in filter residue, filter residue and sulfuric acid The ratio is 1:2.5;

[0075] (b), adding mass percent is 7% soda ash solution as a neutralizing agent, the cobalt sulfate solution is adjusted to a pH value of 2, and then the cobalt sulfate solution is passed through a copper extraction box to remove copper impurities;

[0076] (c), the cobalt sulfate solution that removes copper impurity is added hydrogen peroxide, the addition of hydrogen peroxide is that the cobalt sulfate solution of every cubic meter adds 0.15kg hydrogen peroxide, then adding mass percent is 7% soda ash solution, adjusts pH value to 3.5, presses Impurities are removed by filtration to obta...

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Abstract

The invention relates to the field of production of chemical raw materials, in particular to a cobalt powder preparation method. The cobalt powder preparation method includes the following steps that sulphuric acid is added into lithium cobalt paper for acidolysis of the lithium cobalt paper; after the pH value is regulated to 1 to 3, copper impurities are removed; hydrogen peroxide is added, then the pH value is regulated to 2 to 5, and filter pressing is performed to remove impurities; purification and reaction are carried out to obtain a cobalt nitrate solution; the cobalt nitrate solution reacts with ammonium carbonate to obtain cobalt carbonate; the cobalt carbonate is dried, calcined and cooled to obtain the cobalt powder. According to the preparation method, liquid caustic soda is not needed to treat the lithium cobalt paper, the reducing agent sulfur dioxide does not need to be added in the acidization either, and sodium carbonate is replaced with the ammonium carbonate in the cobalt precipitating process; the cobalt powder is produced and prepared through the lithium cobalt paper, so that production cost is greatly reduced, and environmental pollution is avoided; moreover, the prepared cobalt powder has very high hardness and compressive strength so that the cobalt powder not only can be used as the catalyst of secondary batteries but also can be applied to hard alloy additives and has a wider application range than cobalt oxide.

Description

technical field [0001] The invention relates to the field of chemical raw material production, in particular to a method for preparing cobalt powder. Background technique [0002] At present, due to the high price of metal cobalt, the cost of producing nickel-hydrogen and nickel-chromium secondary battery catalyst-cobaltous oxide is too expensive, and lithium cobalt paper (mainly derived from scrap materials, scraps and dismantling materials produced by battery manufacturers) is used. Raw materials, the production and preparation of cobaltous oxide is not only cheap, but also can reduce the environmental pollution of lithium cobalt paper, so it is popular in the market. The specific steps of producing cobaltous oxide with lithium cobalt paper in the prior art are as follows: first dissolve the raw material in alkali, then acidolysis, and then carry out purification, extraction, precipitation and roasting to obtain cobaltous oxide. However, in the alkali dissolution process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/26
Inventor 冯小龙
Owner 宁波雁门化工有限公司
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