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A kind of extraction washing method of low chloride ion high-purity cobalt sulfate

A washing method and chloride ion technology, applied in the metallurgical field, can solve the problems of high chloride ion, clogging of extraction tank by calcium and magnesium sulfate, etc., and achieve the effect of improving product purity

Active Publication Date: 2022-02-18
江苏雄风科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) After the separation of nickel and cobalt by P507, wash with hydrochloric acid for one stage, and the calcium and magnesium can meet the requirements through process control, but the chloride ions in the cobalt sulfate solution obtained by using sulfuric acid for back extraction in the P507 back extraction section are relatively high;
[0006] 2) After the separation of nickel and cobalt by P507, wash with sulfuric acid for a period of time. After process control, the chloride ion can meet the requirements. However, washing calcium and magnesium with sulfuric acid will easily cause calcium and magnesium sulfate to precipitate and block the extraction tank.

Method used

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  • A kind of extraction washing method of low chloride ion high-purity cobalt sulfate
  • A kind of extraction washing method of low chloride ion high-purity cobalt sulfate
  • A kind of extraction washing method of low chloride ion high-purity cobalt sulfate

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Effect test

Embodiment 1

[0017] The raffinate obtained after leaching cobalt-containing raw materials by conventional methods and P204 extraction to remove impurities has a quality of Co38.26g / l, Ni 0.25g / l, Ca 0.015g / l, Mg 1.58g / l, Mn 0.0008g / l, Fe 0.0015g / l. The production steps are as follows:

[0018] 1) Add the above raffinate to P507 organic extraction to separate nickel and cobalt. The P507 organic extractant and sulfonated kerosene are mixed and prepared at a mass ratio of 1:4, and are subjected to countercurrent extraction in a 10-stage extraction box. The extraction process is saponified with liquid caustic soda, controlled The saponification rate is 55%, the obtained nickel sulfate solution is transferred to the nickel system, and the obtained loaded organic washing nickel is removed to remove magnesium;

[0019] 2) The first stage of washing: the load in the step 1) is organically entered into the first stage of the washing stage for countercurrent washing, and 1.0N hydrochloric acid is a...

Embodiment 2

[0024] After leaching cobalt-containing raw materials by conventional methods, P204 extraction and removal of impurities, the obtained raffinate has a quality of Co4 2.18g / l, Ni 0.35g / l, Ca 0.022g / l, Mg 2.33g / l, Mn 0.0008g / l, Fe 0.0012g / l. The production steps are as follows:

[0025] 1) Add the above raffinate to P507 organic extraction to separate nickel and cobalt. The P507 organic extractant and sulfonated kerosene are mixed and prepared at a mass ratio of 1:5, and are subjected to countercurrent extraction in a 10-stage extraction box. The extraction process is saponified with liquid caustic soda, controlled The saponification rate is 60%, the obtained nickel sulfate solution is transferred to the nickel system, and the obtained load is organically washed to remove magnesium;

[0026] 2) The first stage of washing: the load in the step 1) is organically entered into the first stage of the washing stage for countercurrent washing, and 1.5N hydrochloric acid is added to wa...

Embodiment 3

[0031] The raffinate obtained after leaching cobalt-containing raw materials by conventional methods and P204 extraction to remove impurities has a quality of Co40.18g / l, Ni 0.35g / l, Ca 0.022g / l, Mg 2.63g / l, Mn 0.0008g / l, Fe 0.0012g / l. The production steps are as follows:

[0032] 1) Add the above raffinate to P507 organic extraction to separate nickel and cobalt. The P507 organic extractant and sulfonated kerosene are mixed and prepared at a mass ratio of 1:5, and are subjected to countercurrent extraction in a 10-stage extraction box. The extraction process is saponified with liquid caustic soda, controlled The saponification rate is 60%, the obtained nickel sulfate solution is transferred to the nickel system, and the obtained load is organically washed to remove magnesium;

[0033] 2) The first stage of washing: the load in the step 1) is organically entered into the first stage of the washing stage for countercurrent washing, and 1.2N hydrochloric acid is added to wash a...

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Abstract

The invention discloses a method for extracting and washing low-chloride ion high-purity cobalt sulfate, which comprises the following steps: 1) leaching cobalt-containing raw materials through conventional methods, and extracting and removing impurities with P204, and then mixing an organic extractant with the obtained raffinate The sulfonated kerosene is mixed and extracted through the extraction box; 2) The loaded organics enter the extraction and washing section for countercurrent washing, a small amount of nickel, magnesium, and calcium impurities in the organic phase are washed with hydrochloric acid, and chlorine ions are removed from the washed loaded organics ;3) The second stage of washing: the washed loaded organic in the step 2) enters the second stage of washing for countercurrent washing of chloride ions, adding sulfuric acid for washing, controlling the pH value, and back-extracting the obtained washed loaded organic with sulfuric acid . The problem of high impurities or high chloride ions in cobalt sulfate products effectively improves the purity of cobalt sulfate products and guarantees the quality of raw materials for battery cathode material precursors. Two-stage washing is adopted to achieve the effect of chloride ion washing without forming calcium and magnesium sulfate. Precipitation clogs the extraction tank.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for extracting and washing low-chloride ion high-purity cobalt sulfate. Background technique [0002] With the upgrading of my country's industry, the performance requirements of hard alloys, precision alloys, and petrochemical catalysts are getting higher and higher, and the requirements for raw materials are correspondingly increased. Especially for the rapid development of lithium-ion rechargeable batteries in my country, cobalt sulfate is an important The raw materials for preparing the precursors of battery cathode materials put forward higher requirements for cobalt sulfate, which is indispensable for these materials. [0003] According to public information, the production of cobalt sulfate is mainly based on the dissolution of cobalt raw materials in a sulfuric acid system, reduction of sulfite, oxidation and removal of iron, extraction and purification of P204...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/38C22B23/00
CPCC22B23/04C22B3/3846Y02P10/20
Inventor 王松辉张晓权刘枫
Owner 江苏雄风科技有限公司
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