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Use and method of amino acid-containing phosphine extractant for extracting and separating cobalt and nickel

A technology of amino acid and extractant, applied in the direction of improving process efficiency, etc., can solve the problems of difficult separation of sulfate solution, large loss of extractant, small separation coefficient, etc., achieve good separation effect, reduce separation cost, and have stable properties Effect

Active Publication Date: 2020-06-19
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the separation coefficient of P507 for cobalt and nickel is small, and it is difficult to separate the sulfate solution with high nickel and low cobalt, and P507 has a certain extraction of calcium and magnesium, and calcium sulfate precipitation will occur during back extraction, which will affect normal operation; Although Cyanex272 is better than P507 in separating cobalt and can reduce the number of extraction stages, it is very expensive. The import price is about 400,000 / ton, and the loss of extractant is large during the separation of cobalt and nickel.

Method used

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  • Use and method of amino acid-containing phosphine extractant for extracting and separating cobalt and nickel
  • Use and method of amino acid-containing phosphine extractant for extracting and separating cobalt and nickel
  • Use and method of amino acid-containing phosphine extractant for extracting and separating cobalt and nickel

Examples

Experimental program
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Effect test

Embodiment 1

[0092] Preparation of the organic phase: Mix 3L 1-(2-ethylhexylamino)methylphosphonic acid mono(2-ethylhexyl)ester with 7L sulfonated kerosene, then add sodium hydroxide solid to saponify at a degree of saponification of 40% , to obtain the organic phase.

[0093] The feed liquid is a mixed solution of cobalt and nickel chloride, wherein the concentration of cobalt is 0.2 mol / L, and the concentration of nickel is 0.2 mol / L; the pH of the feed liquid is 5.0.

[0094] The washing solution is 0.2mol / L hydrochloric acid solution.

[0095] The stripping agent is 1.0mol / L hydrochloric acid solution.

[0096] The organic phase and the feed liquid are mixed at a ratio of 1:1 by volume to perform 10-stage countercurrent extraction to obtain a nickel-containing extract and a cobalt-containing raffinate aqueous phase. Then, the nickel-containing extraction solution and the washing solution are mixed at a volume ratio of 10:1 for two-stage countercurrent washing, and the resulting washi...

Embodiment 2

[0104] Mix 3L 1-(2-methylhexylamino)methylphosphonic acid mono(2-ethylhexyl)ester, 1L methylheptanol and 6L aviation kerosene, then add NaOH for saponification according to the degree of saponification of 30%, to obtain organic Mutually.

[0105] The feed liquid is a mixed solution of cobalt and nickel sulfate, wherein the concentration of cobalt is 0.5 mol / L, and the concentration of nickel is 0.1 mol / L; the pH of the feed liquid is 5.5.

[0106] The detergent is water.

[0107] Stripping agent is [H 2 SO 4 ]=1.0mol / L sulfuric acid solution.

[0108] The organic phase and the feed liquid are mixed at a ratio of 1:2 by volume to perform 20-stage countercurrent extraction to obtain a nickel-containing extract and a cobalt-containing raffinate aqueous phase. Then, the nickel-containing extract and washing liquid are mixed at a volume ratio of 6:1 for 10-stage countercurrent washing, and the resulting washing liquid is circulated back to the extraction section for the extract...

Embodiment 3

[0116] Mix 3L of 1-(2-propylpentylamino)methylphosphonic acid mono(2-ethylhexyl)ester with 7L of aviation kerosene, then add sodium hydroxide for saponification according to the degree of saponification of 25%, to obtain an organic phase.

[0117] The feed liquid is a mixed solution of cobalt-nickel nitrate, wherein the concentration of cobalt is 0.05 mol / L, and the concentration of nickel is 0.5 mol / L; the pH of the feed liquid is 4.8.

[0118] The stripping agent is 0.5mol / L nitric acid solution.

[0119] The organic phase was mixed with the volume ratio of solid to liquid at a ratio of 3:1 to perform one-stage countercurrent extraction to obtain a nickel-containing extract and a cobalt-containing raffinate aqueous phase. Then, the nickel-containing extract and the stripping agent are directly subjected to 5-stage countercurrent stripping at a volume ratio of 20:1 to obtain a nickel-containing aqueous solution.

[0120] Elemental analysis was carried out on the obtained nic...

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Abstract

The present invention relates to the use and method of the amino acid-containing phosphine extractant of the following general formula I for the extraction and separation of cobalt and nickel, wherein R 1 from C 1 ~C 12 Alkyl, R 2 from C 1 ~C 14 alkyl. The method comprises the step of using the amino acid-containing phosphine extractant of the general formula I to extract and separate nickel from a feed solution containing cobalt and nickel. The method of the present invention can preferentially extract nickel, so as to realize the separation of nickel and cobalt, so it has significant advantages in separating low-nickel and high-cobalt feed liquid. In addition, the amino acid-containing phosphine extractant used in the present invention can not only separate cobalt and nickel in different acid media, but also has good extraction and separation capabilities, and the synthesis method is simple, the cost is low, the property is stable, and it is easy to realize industrialization. It has high industrial application value.

Description

technical field [0001] The invention relates to a method for extracting and separating cobalt and nickel, in particular to the use and method of a class of amino acid-containing phosphine extractant for extracting and separating cobalt and nickel. Background technique [0002] Nickel and cobalt are important strategic metals with the characteristics of corrosion resistance, oxidation resistance, high strength and good ductility. As an important raw material for manufacturing lithium batteries, alloys and catalysts, cobalt is widely used in high-tech fields such as national defense, electronics, and aerospace; nickel is an important part of nickel-cadmium batteries and stainless steel, and is widely used in aviation, chemical industry, and telecommunications. aspect. [0003] In recent years, the consumption of nickel and cobalt has maintained a relatively large growth trend, and modern industry requires relatively high purity of nickel and cobalt, so the separation of nicke...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/38C22B23/00
CPCC22B23/0453C22B3/3844Y02P10/20
Inventor 廖伍平王永姣李艳玲邝圣庭张志峰吴国龙
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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