Method for preparing electric deposited cobalt

An electrowinning and roughing technology, which is used in the field of electrowinning cobalt produced by the hydrochloric acid cycle, can solve the problems of environmental danger, environmental pollution, a large amount of chlorine gas, etc., and achieve the effects of avoiding pollution, high purity, and reducing anti-corrosion pressure.

Inactive Publication Date: 2012-01-25
ZHEJIANG HUAYOU COBALT
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The existing electrolytic deposition of cobalt chloride to produce electrolytic cobalt mainly has the following problems: the electrolytic deposition process will produce a large amount of chlorine gas, whose w

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  • Method for preparing electric deposited cobalt

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Example Embodiment

[0018] Example 1

[0019] Using cobalt concentrate, cobalt-copper alloy or crude cobalt salt as raw materials, leaching with sulfuric acid, after the leaching solution is decoppered and iron-removed, it is extracted with P204 extractant to remove impurities; The cobalt chloride solution is obtained, and after degreasing, a cobalt chloride solution with Co 100-160g / L, other metal impurities ≤0.001g / L, and oil content ≤0.001g / L is obtained, and a low-concentration electrowinning solution (Co 40-60g / L) mixed to obtain Co80-100g / L cobalt chloride solution, as the liquid before electroplating; carry out electroplating in a closed electrolytic cell, control the pH of the electroplating to be 1-2, and the temperature to be 50- 55℃, the current density is 430-500A / m2, the cell voltage is 2.6-3.0V, etc., to obtain cobalt electrodeposit, the cobalt electrodeposition is obtained after the slot, stripping, washing and slicing to obtain a finished cobalt sheet with a Co% of 99.987% . At ...

Example Embodiment

[0020] Example 2

[0021] Using cobalt concentrate, cobalt-copper alloy or crude cobalt salt as raw materials, leaching with sulfuric acid, after the leaching solution is decoppered and iron-removed, it is extracted with P204 extractant to remove impurities; The cobalt chloride solution is obtained, and after degreasing, the cobalt chloride solution with Co 120-160g / L, remaining metal impurities ≤0.001g / L, and oil content ≤0.001g / L is obtained, and a low-concentration electrowinning solution (Co 40-50g / L) mixing to obtain Co80-100g / L cobalt chloride solution, as the liquid before electroplating; carry out electroplating in a closed electrolytic cell, control the pH of the electroplating to be 1-2, and the temperature to be 50- 55℃, the current density is 430-500A / m2, and the cell voltage is 2.5-3.0V, etc., to obtain cobalt electrodeposited. . At the same time of electrowinning cobalt, chlorine gas will be precipitated at the anode, and the chlorine gas will enter the electro...

Example Embodiment

[0022] Example 3

[0023] Using cobalt concentrate, cobalt-copper alloy or crude cobalt salt as raw materials, leaching with hydrochloric acid, after copper removal and iron removal, P204 extraction is used to remove impurities; then P507 is used to extract cobalt, and hydrochloric acid is used for back extraction to obtain cobalt chloride solution , after oil removal, a cobalt chloride solution with Co100-160g / L, other metal impurities ≤0.001g / L, and oil content ≤0.001g / L is obtained, and a low-concentration electrowinning solution (Co 40-60g / L) Mixing to obtain Co 80-100g / L cobalt chloride solution as the pre-electrodeposition solution; carry out electro-deposition in a closed electrolytic cell, control the pH of the electro-deposition to be 1-2, the temperature to be 50-55°C, and the current density to be 430-480A / m2, the cell voltage is 2.5-3.0V, etc., to obtain the electro-deposited cobalt, and the electro-deposited cobalt obtains a finished cobalt sheet with a Co% of 99....

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Abstract

The invention relates to a method for preparing electric deposited cobalt by circulating hydrochloric acid. At present, various preparation processes of the electric deposited cobalt have huge potential hazard risk to the environment. The preparation process comprises the following steps of: leaching and purifying cobalt concentrate, copper-cobalt alloy or crude cobalt salt as raw materials; then extracting by adopting P507 to extract the cobalt; back extracting to obtain cobalt chloride solution with hydrochloric acid; deoiling the cobalt chloride solution and then mixing the denoiled cobalt chloride solution with part of electric deposited liquid to obtain front electric deposited liquid; carrying out electric deposition in an airtight electrolytic cell to obtain the electric deposited cobalt; allowing chlorine gas generated in the electric deposited process and back electric deposited liquid to enter the interior of an electric deposited circulating tank; after the mixture is separated by a gas-liquid separator, separating wet chlorine gas from the electric deposited liquid; and carrying out vacuum antichloration on the electric deposited liquid and returning the treated electric deposited liquid to work procedures of preparing the front electric deposited liquid and back extracting the P507. The electric deposited cobalt obtained in the invention has high purity; a byproduct hydrochloric acid has high purity and is recycled; and the discharge of the chlorine gas or chloride ions is avoided; and the influence on the environment in the treatment process by other treatment methods of the chlorine gas is avoided.

Description

technical field [0001] The invention relates to the preparation of electro-deposited cobalt, in particular to a method for preparing electro-deposited cobalt by circulating hydrochloric acid. Background technique [0002] Cobalt has excellent properties such as corrosion resistance, high melting point, and strong magnetism. It is an important raw material for the production of various special steels, heat-resistant alloys, corrosion-resistant alloys, and magnetic alloys. It is widely used in aerospace, machinery manufacturing, and electromagnetic fields. Higher cobalt is widely used in superalloy materials, magnetic materials, and targets for advanced electronic components. Cobalt production is generally produced by electrowinning, that is, cobalt sulfate or cobalt chloride solution is used as raw material for electrowinning preparation, and cobalt chloride solution is mostly used as raw material. The existing electrolytic deposition of cobalt chloride to produce electrolyt...

Claims

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Application Information

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IPC IPC(8): C25C1/08C25B1/26C01B7/01
CPCY02P10/20
Inventor 陈雪华刘永东向波卿波
Owner ZHEJIANG HUAYOU COBALT
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