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Solvent extraction method

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

Active Publication Date: 2021-11-09
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

[0021] Hereinafter, an embodiment of the present invention will be described.

[0022] In the solvent extraction method of the present embodiment, magnesium is extracted into the organic solvent by contacting an acidic aqueous sulfuric acid solution containing nickel, cobalt, and magnesium with an organic solvent. Magnesium is selectively isolated by allowing nickel and cobalt to remain in the aqueous phase while extracting magnesium into the organic phase.

[0023] The apparatus used for solvent extraction is not particularly limited. As the solvent extraction device, a mixer-settler extractor can be exemplified.

[0024] As the organic solvent, a reagent obtained by diluting the extractant with a diluent is used. Alkylphosphonates are used as extractants. Examples of alkyl phosphonates include bis(2-ethylhexyl) hydrogen phosphate (D2EHPA, bis(2-ethylhexyl) hydrogen phosphate), 2-ethylhexyl (2-ethylhexyl) phosphonate (PC -88A, 2-ethylhexylhydrogen-2-ethylhexylphosphonate)...

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Abstract

The invention provides a solvent extraction method for selectively extracting magnesium from sulfuric acid acidic aqueous solution. A solvent extraction method in which magnesium is extracted into the organic solvent by contacting an acidic aqueous solution of sulfuric acid containing nickel, cobalt, and magnesium with an organic solvent. The extractant composed of alkyl phosphonate is used as an organic solvent after being diluted with a diluent. The concentration of the extractant is set to be 40% by volume or more and 60% by volume or less, and the pH of the sulfuric acid acidic aqueous solution is set to be 1.5 to 2.0 inclusive. Alternatively, the concentration of the extractant is set to be 20% by volume or more and 50% by volume or less, and the pH of the acidic sulfuric acid aqueous solution is set to be 2.0 or more and 2.5 or less.

Description

technical field [0001] The present invention relates to a solvent extraction method. 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 systems have attracted attention. [0003] For example, nickel-containing cathode materials such as NCM-based cathode materials and NCA-based cathode materials are produced by treating an aqueous solution containing a metal salt such as nickel with an alkali, and subjecting the obtained metal hydroxide to a calcination treatment. of. As the metal sal...

Claims

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Application Information

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Patent Type & Authority Patents(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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