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Method for preparing high-purity cobalt

A high-purity, solution technology, applied in photography technology, instruments, photography auxiliary technology and other directions, can solve the problems of easy pollution, high production cost, unsatisfactory solution depth purification, etc., to reduce costs and prevent process pollution.

Inactive Publication Date: 2009-09-23
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the existing production method of high-purity cobalt, in order to solve the problem of high acidity in the electrolysis stock solution, the method of boiling acid removal is adopted, resulting in high production cost and easy pollution; the deep purification of the solution is not ideal
Due to the use of soluble anodes, mutual contamination between the electrolytic cathode and the anolyte is prone to occur, resulting in high impurity content of high-purity cobalt
At the same time, the method of two-step electrolysis is adopted, resulting in high production cost and large energy consumption

Method used

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  • Method for preparing high-purity cobalt
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  • Method for preparing high-purity cobalt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Using 99.95% electrolytic cobalt to prepare CoCl by electrolysis in hydrochloric acid system 2 solution with a current density of 150A / m 2 , electrodissolved into the solution of H + Use 30A / m at the end of liquid production with a concentration of 1g / l 2 The current density of the solution is used to make liquid, so that the pH of the solution is 3.5, and the content of impurity elements in the solution is shown in Table 1:

[0028] Table 1-Content of impurity elements in the original solution Unit: g / l

[0029]

[0030] The solution after electrolysis was sequentially passed into the ion exchange column of mixed anion exchange resins respectively anion exchange resin 331, 717, D301 and D401 to purify the solution. The exchange flow rate was controlled at 1BV / h.

[0031] Table 2-Content of impurity elements in the solution after ion exchange Unit: g / l

[0032] serial number

name

Ni

Cu

Fe

Pb

Zn

1

after ion exchange

...

Embodiment 2

[0041] Using 99.95% electrolytic cobalt to prepare CoCl by electrolysis in hydrochloric acid system 2 solution with a current density of 200A / m 2 , electrodissolved into the solution of H + 50A / m is used at the end of liquid production with a concentration of 1.5g / l 2 The current density of the solution was used to make liquid, so that the pH of the solution was 4.3, and the content of impurity elements in the solution was shown in Table 5.

[0042] Table 5-Content of impurity elements in the original solution Unit: g / l

[0043]

[0044] The solution after electrolysis was sequentially passed into the ion exchange column of mixed anion exchange resins respectively anion exchange resin 331, 717, D301 and D401 to purify the solution. The exchange flow rate was controlled at 1BV / h.

[0045] Table 6-The content of impurity elements in the solution after ion exchange Unit: g / l

[0046] serial number

name

Ni

Cu

Fe

Pb

Zn

1

after ion ...

Embodiment 3

[0055] Using 99.95% electrolytic cobalt to prepare CoCl by electrolysis in hydrochloric acid system 2 solution with a current density of 300A / m 2 , electrodissolved into the solution of H + 70A / m is used at the end of the liquid-making stage with a concentration of 2g / l 2 The current density of the solution is used to make liquid, so that the pH of the solution is 5, and the content of impurity elements in the solution is shown in Table 9.

[0056] Table 9-Content of impurity elements in the original solution Unit: g / l

[0057]

[0058] The solution after electrolysis was sequentially passed into the ion exchange column of mixed anion exchange resins, namely anion exchange resin 331, 717, D301 and D401, for concentration purification, and the exchange flow rate was controlled at 1BV / h.

[0059] Table 10-Content of impurity elements in the solution after ion exchange Unit: g / l

[0060] serial number

name

Ni

Cu

Fe

Pb

Zn

1

after ...

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Abstract

The invention relates to a method for preparing high-purity cobalt by adopting hydrochloric acid solution system electrodeposition. The method is characterized in that the technical process is sequentially as follows: hydrochloric acid solution system is adopted and 99.95% of electrodeposition cobalt is taken as an anode; a CoCI2 solution with ph of 3-3.5 is prepared by an electrolytic solution; the regular electrolytic solution is sequentially led into anion exchange resin for ion exchange deep clarification, and finally led into an electrobath for electrodeposition; the solution amount prossed by ion exchange clarification is equal to extracted and electrodeposited solution; the high-purity cobalt is obtained by electrodeposition. The electronic torch melting is carried out on high-purity cobalt to prepare high-purity cobalt ingot which can meet the requirements of different users. The high-purity electrodepositing cobalt of 5N or more than 5 N and high purity ingot are reached by high-purity cobalt prepared by the method processed by glow discharge mass spectrography-GDMS analyzing.

Description

technical field [0001] A method for preparing high-purity cobalt relates to a method for preparing high-purity cobalt by combining electrolysis with hydrochloric acid system, ion exchange purification, electrowinning refining and electron beam smelting. Background technique [0002] High-purity metals are mainly used in the field of electronic chemistry and the preparation of special alloys. The development of high-tech requires sufficient special materials. A variety of metals can be used as high-tech strategic materials and are required to be purified to very high purity. The preparation, characteristics and applications of high-purity and ultra-high-purity metals are widely used in modern materials science and engineering. The field is a new type of growing field. [0003] Cobalt is one of the important high-purity metal materials, and it is an important material for the preparation of components such as magnetic recording, magnetic recording heads, optoelectronic device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/08
Inventor 李永军武浚杨艳卢越刚马永峰李静邱平王克震
Owner JINCHUAN GROUP LIMITED
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