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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
  • Application Information

AI Technical Summary

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 weight is about 12 times the weight of electrolytic cobalt, polluting the environment
To sum up, the current various electrodeposited cobalt preparation processes pose a potentially huge danger to the environment

Method used

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  • Method for preparing electric deposited cobalt

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Effect test

Embodiment 1

[0019] Cobalt concentrate, cobalt-copper alloy or crude cobalt salt are used as raw materials, and sulfuric acid is used for leaching. After the leaching solution is decoppered and iron removed, it is extracted with P204 extractant to remove impurities; then the cobalt is extracted with P507 extractant, and back-extracted with hydrochloric acid. Obtain cobalt chloride solution, after degreasing, obtain Co 100-160g / L, remaining metal impurity≤0.001g / L, the cobalt chloride solution of oil content≤0.001g / L, and the electrodeposition liquid of low concentration (Co 40-60g / L) mixed to obtain Co80-100g / L cobalt chloride solution, as the solution before electrowinning; electrowinning is carried out in a closed electrolytic cell, and the pH of the controlled electrowinning is 1-2, and the temperature is 50- 55°C, current density of 430-500A / m2, cell voltage of 2.6-3.0V, etc., to obtain electro-deposited cobalt, after electro-deposited cobalt goes out of the tank, stripped, washed and s...

Embodiment 2

[0021] Cobalt concentrate, cobalt-copper alloy or crude cobalt salt are used as raw materials, and sulfuric acid is used for leaching. After the leaching solution is decoppered and iron removed, it is extracted with P204 extractant to remove impurities; then the cobalt is extracted with P507 extractant, and back-extracted with hydrochloric acid. Obtain the cobalt chloride solution, after degreasing, obtain the cobalt chloride solution of Co 120-160g / L, remaining metal impurity≤0.001g / L, oil content≤0.001g / L, and the electrodeposition liquid of low concentration (Co 40-50g / L) mixed to obtain Co80-100g / L cobalt chloride solution, as the solution before electrowinning; electrowinning is carried out in a closed electrolytic cell, and the pH of the controlled electrowinning is 1-2, and the temperature is 50- 55°C, current density of 430-500A / m2, cell voltage of 2.5-3.0V, etc., to obtain electro-deposited cobalt, after electro-deposited cobalt goes out of the tank, stripped, washed a...

Embodiment 3

[0023] Using cobalt concentrate, cobalt-copper alloy or crude cobalt salt as raw materials, leaching with hydrochloric acid, after decopper and iron removal, use P204 extraction to remove impurities; then use P507 extraction to extract cobalt, and back-extract with hydrochloric acid to obtain cobalt chloride solution , after oil removal, a cobalt chloride solution with Co100-160g / L, other metal impurities ≤0.001g / L, oil content ≤0.001g / L is obtained, and a low-concentration electrolytic solution (Co 40-60g / L) Mix to obtain a cobalt chloride solution of Co 80-100g / L as the pre-electrowinning solution; conduct electrowinning in a closed electrolytic cell, control the electrowinning pH to 1-2, the temperature to 50-55°C, and the current density 430-480A / m2, cell voltage 2.5-3.0V and other conditions, to obtain electro-deposited cobalt, after the electro-deposited cobalt goes out of the tank, stripping, washing and slicing, the finished cobalt flakes with a Co% of 99.988% are obtai...

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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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