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Method of removing iron from nickel chloride leachate

A technology of nickel chloride and leachate, applied in nickel halide and other directions, can solve the problems of poor effect stability, high fire protection requirements, and many extraction stages.

Active Publication Date: 2009-10-28
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the leaching solution of nickel chloride, in order to obtain a nickel chloride solution with low iron content, the production method of extracting and removing iron is adopted, and the depth of iron removal can reach below 0.002g / l, but with the increase of iron ions in the solution before extraction , the use of extraction methods to remove iron has the problems of many extraction stages and poor effect stability. At the same time, there are difficulties such as large investment, high fire protection requirements, high extraction organic consumption, and the organics in the solution need to be treated separately.
Using the method of sodium chlorate oxidation neutralization and iron removal, sodium ions will be brought into the solution, which will affect the quality of the solution
The method of air oxidation is used, the oxidation time is long and the work efficiency is low.

Method used

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  • Method of removing iron from nickel chloride leachate
  • Method of removing iron from nickel chloride leachate
  • Method of removing iron from nickel chloride leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Heat the chlorinated leaching solution to 85°C, pass chlorine gas into the chlorinated leaching solution, and control the oxidation-reduction potential at 690mv, so that the Fe in the chlorinated leaching solution 2+ Oxidized to Fe 3+ , adjust the pH of the solution to 3.0 with nickel carbonate, stop the addition of nickel carbonate, and form Fe(OH) 3 , reacted for 3.5 hours, and obtained a nickel chloride solution containing less than 0.006 g / l of iron through slag and liquid separation.

[0010] Statistics of Ni and Fe content in the solution before and after iron removal g / l

[0011]

Embodiment 2

[0013] Heat the chlorinated leaching solution to 90°C, pass chlorine gas into the chlorinated leaching solution, and control the oxidation-reduction potential at 650mv, so that the Fe in the chlorinated leaching solution 2+ Oxidized to Fe 3+ , adjust the pH of the solution to 3.2 with nickel carbonate, stop the addition of nickel carbonate, and form Fe(OH) 3 , reacted for 2 hours, and obtained a nickel chloride solution containing less than 0.006 g / l of iron through slag and liquid separation.

[0014] Statistics of Ni and Fe content in the solution before and after iron removal g / l

[0015]

Embodiment 3

[0017] Heat the chlorinated leaching solution to 88°C, pass chlorine gas into the chlorinated leaching solution, and control the oxidation-reduction potential at 690mv, so that the Fe in the chlorinated leaching solution 2+ Oxidized to Fe 3+ , adjust the pH of the solution to 3.5 with nickel carbonate, stop the addition of nickel carbonate to form Fe(OH) 3 , reacted for 2.8 hours, and obtained a nickel chloride solution containing less than 0.006 g / l of iron through slag and liquid separation.

[0018] Statistics of Ni and Fe content in the solution before and after iron removal g / l

[0019]

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Abstract

The invention relates to a method for removing iron in a nickel chloride leach solution, relating to a method for removing impurities in a chlorination medium, in particular to a method for removing iron in a chlorination leach solution. It is characterized in that the temperature of the chlorinated leaching solution is raised to 85-95°C, chlorine gas is introduced into the chlorinated leaching solution, and the oxidation-reduction potential is controlled at 650-750mv, so that Fe2+ in the chlorinated leaching solution is oxidized to Fe3+, and adjusted with nickel carbonate When the pH of the solution is 3.0-4.0, stop adding nickel carbonate to form Fe(OH)3, react for 2-4 hours, and obtain a nickel chloride solution containing less than 0.006 g / l of iron through solid-liquid separation. The method of the invention realizes that the thoroughness of iron removal is not affected by the iron concentration of the nickel chloride solution, and satisfies the requirement of deeply purifying the iron in the nickel chloride solution.

Description

technical field [0001] The invention relates to a method for removing iron from a nickel chloride leaching solution, relating to a method for removing impurities in a chlorination medium, in particular to a method for removing iron in a chlorination leaching solution. Background technique [0002] In the leaching solution of nickel chloride, in order to obtain a nickel chloride solution with low iron content, the production method of extracting and removing iron is adopted, and the depth of iron removal can reach below 0.002g / l, but with the increase of iron ions in the solution before extraction However, the use of extraction to remove iron has the problems of many extraction stages and poor effect stability. At the same time, there are difficulties such as large investment, high fire protection requirements, high extraction organic consumption, and the organics in the solution need to be treated separately. Using the method of sodium chlorate oxidation neutralization and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/09
Inventor 崔芸曹增城李书山
Owner JINCHUAN GROUP LIMITED
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