Extraction washing method for low-chlorine-ion high-purity cobaltous sulfate

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

Active Publication Date: 2019-04-12
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 relat

Method used

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  • Extraction washing method for low-chlorine-ion high-purity cobaltous sulfate
  • Extraction washing method for low-chlorine-ion high-purity cobaltous sulfate
  • Extraction washing method for low-chlorine-ion high-purity cobaltous 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 an extraction washing method for low-chlorine-ion high-purity cobaltous sulfate. The extraction washing method comprises the following steps that firstly, cobalt containing rawmaterials are subjected to leaching and P204 extraction and impurity removal through a conventional method, raffinate is obtained, an organic extraction agent and sulfonated kerosene are mixed, and counter-current extraction is conducted through an extraction box; secondly, a loaded organic phase enters an extraction washing section for counter-current washing, hydrochloric acid is used for washing a small number of nickel, magnesium and calcium impurities in the organic phase, and the obtained washed loaded organic phase is subjected to washing and chlorine ion removal; and thirdly, second-section washing is conducted, the washed loaded organic phase in the second step enters second-section washing and is subjected to counter-current chlorine ion washing, sulfuric acid is added for washing, the PH value is controlled, and the obtained washed loaded organic phase is subjected to reverse extraction through sulfuric acid. The problem that cobaltous sulfate products are high in impurityor chlorine ion content is solved, the purity of the cobaltous sulfate products is improved, the quality of raw materials of the battery positive electrode material precursor is guaranteed, the two-section washing manner is adopted, the chlorine ion washing effect is achieved, magnesium calcium sulfate sediments cannot be formed, so that extraction tank blockage is avoided

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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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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