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Solvent extraction method

An extraction and solvent technology, applied in the field of solvent extraction for separating magnesium, can solve problems such as difficult separation of magnesium

Active Publication Date: 2020-11-03
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is difficult to selectively separate magnesium from an acidic aqueous solution of sulfuric acid containing nickel and magnesium

Method used

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Embodiment Construction

[0023] Hereinafter, an embodiment of the present invention will be described.

[0024] In the solvent extraction method of the present embodiment, magnesium is extracted into the organic solvent by bringing an acidic sulfuric acid aqueous solution containing nickel, cobalt, and magnesium into contact with an organic solvent. Magnesium is selectively separated by leaving nickel and cobalt in the aqueous phase while extracting magnesium into the organic phase.

[0025] The apparatus used for solvent extraction is not particularly limited. As a solvent extraction device, a mixer-settler extractor can be exemplified.

[0026] A reagent obtained by diluting the extractant with a diluent is used as the organic solvent. Alkyl phosphonates are used as extractants. Examples of alkyl phosphonates include bis(2-ethylhexyl) phosphate (D2EHPA, bis(2-ethylhexyl)hydrogen phosphate), (2-ethylhexyl) phosphonic acid 2-ethylhexyl (PC -88A, 2-ethylhexylhydrogen-2-ethylhexylphosphonate), bis(2...

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Abstract

Provided is a solvent extraction method capable of selectively separating magnesium from an acidic aqueous solution of sulfuric acid. This solvent extraction method is for extracting magnesium in an organic solvent by bringing an acidic aqueous solution, of sulfuric acid, containing nickel, cobalt, and magnesium into contact with the organic solvent. As the organic solvent, one that is obtained bydiluting an extraction agent containing an alkyl phosphonic acid ester with a diluent is used. The concentration of the extraction agent is 40-60 vol%, and the pH of the acidic aqueous solution of sulfuric acid is 1.5-2.0. Alternatively, the concentration of the extraction agent is 20-50 vol%, and the pH of the acidic aqueous solution of sulfuric acid is 2.0-2.5.

Description

technical field [0001] The present invention relates to solvent extraction methods. In more detail, the present invention relates to a solvent extraction process for separating magnesium from an acidic aqueous solution of sulfuric acid containing nickel, cobalt and magnesium. Background technique [0002] Various positive electrode materials have been developed as positive electrode materials for lithium ion batteries of secondary batteries. In recent years, nickel / cobalt / manganese (NCM)-based positive electrode materials called ternary systems and nickel / cobalt / aluminum (NCA)-based positive electrode materials called nickel-based systems have attracted attention. [0003] For example, nickel-containing positive electrode materials such as NCM-based positive electrode materials and NCA-based positive electrode materials are produced by treating an aqueous solution of a salt containing a metal such as nickel with an alkali, and performing a firing treatment on the obtained m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/22B01D11/04C22B3/38
CPCB01D11/04C22B26/22C22B23/0453C22B3/3846B01D11/0488B01D11/0492
Inventor 大原秀树浅野聪小林宙高野雅俊三条翔太
Owner SUMITOMO METAL MINING CO LTD
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