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Method for extracting and separating scandium

A technology of extraction and extraction agent, which is applied in the field of separating scandium and other impurities by using amide pod ether extraction agent, can solve the problems of difficulty in obtaining high-purity scandium products, the separation of impurities is not mentioned, and the residue of solid waste, etc., and achieves easy continuous Industrial production, good for separation, low equipment requirements

Active Publication Date: 2020-11-20
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The removal rate of iron by this method is greater than 95%, indicating that a certain amount of iron still remains in the leaching solution, which affects the purity of scandium.
Chinese patent (publication number CN109022810B) discloses a method for separating and recovering valuable metals iron, manganese and scandium from tungsten slag, using P204 to extract the leachate of sulfuric acid, and the single-stage extraction rates of iron, manganese and scandium in the leachate are respectively 86.1% , 82.4% and 97.7%, it is difficult to obtain high-purity scandium products by using different stripping solutions to strip metals
The Chinese patent (publication number CN109022839A) discloses a method for enriching scandium. Different extractants are used to enrich scandium, and neutral, alkaline, and organic chelating extractants scandium are used for extraction and stripping. Separation of impurities
Chinese patent (publication number CN1844421A) discloses a method for extracting scandium from red mud. P204 is used to extract and recover scandium from red mud. Large amounts of concentrated acid with low iron content, difficult to handle
[0004] Phosphorus-containing extractants (P204, etc.) are commonly used in the above-mentioned extraction and separation. Adding alkali during the extraction process produces salty and ammonia-nitrogen wastewater, which is difficult to treat and has solid waste residues after combustion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) The concentration of Sc in the aqueous phase is 5 g / L, and the concentration of nitric acid is 0.6 mol / L.

[0022] (2) Using toluene as the diluent, prepare 0.5 mol / L N,N,N',N'-tetracyclohexyl-3-oxoglutaramide as the organic phase.

[0023] (3) Mix 20 mL each of the aqueous phase and the organic phase, stir for 30 min, and extract at 10 o C, the concentration of Sc in the raffinate was measured, and the extraction rate was 99.89%.

[0024] (4) Take 20 mL of 0.5 mol / L oxalic acid aqueous solution and mix it with the extracted organic phase. The stirring time is 30 min and the temperature is 30 °C. o C, standing to separate the organic phase, filtering the water phase to obtain precipitation, 120 o C drying for 2 hours, 600 o C was calcined for 2 hours to obtain scandium oxide. The recovery rate of scandium is over 98%, and the purity of scandium is over 99.8%.

Embodiment 2

[0026] (1) The concentration of Sc in the aqueous phase is 5 g / L, and the concentration of nitric acid is 0.6 mol / L.

[0027] (2) Using toluene as the diluent, prepare 0.5 mol / L N,N,N',N'-tetracyclohexyl-3-oxoglutaramide as the organic phase.

[0028] (3) Mix 20 mL each of the aqueous phase and the organic phase, stir for 30 min, and extract at 40 o C, the concentration of Sc in the raffinate was measured, and the extraction rate was 98.85%.

[0029] (4) Take 20 mL of 0.5 mol / L oxalate aqueous solution and mix it with the extracted organic phase. The stirring time is 30 min and the temperature is 30 o C, standing to separate the organic phase, filtering the water phase to obtain precipitation, 120 o C drying for 2 hours, 600 o C was calcined for 2 hours to obtain scandium oxide. The recovery rate of scandium is over 97%, and the purity of scandium is over 99.3%.

Embodiment 3

[0031] (1) The concentration of Sc in the aqueous phase is 10 g / L, and the concentration of nitric acid is 3.0 mol / L.

[0032] (2) Using toluene as the diluent, prepare 1 mol / L of N,N,N',N'-tetracyclohexyl-3-oxoglutaramide as the organic phase.

[0033] (3) Mix 20 mL each of the aqueous phase and the organic phase, stir for 30 min, and extract at 20 o C, the concentration of Sc in the raffinate was measured, and the extraction rate was 99.98%.

[0034] (4) Take 20 mL of 0.5 mol / L oxalic acid aqueous solution and mix it with the extracted organic phase. The stirring time is 30 min and the temperature is 30 o C, standing to separate the organic phase, filtering the water phase to obtain precipitation, 120 o C drying for 2 hours, 600 o C was calcined for 2 hours to obtain scandium oxide. The recovery rate of scandium is over 98%, and the purity of scandium is over 99.9%.

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PUM

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Abstract

The invention belongs to the technical field of extraction and purification of scandium, and particularly relates to a method for separating scandium and other impurities by using an amide podether extracting agent. According to the method, scandium is separated from a nitric acid medium by taking N, N, N', N'-tetracyclohexyl-3-oxoglutaramide as an extracting agent, so that the scandium has high selectivity, the capability of extracting impurities such as Fe, Mg, Ti, Ba, Al, Zr and Mn is poor, and separation of scandium and impurity elements is realized. The method is simple in operation, lowin pollution and low in equipment requirement.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, and in particular relates to a method for separating scandium and other impurities by using amide pod ether extractant. Background technique [0002] The excellent performance of scandium makes it play an important role in the fields of electric light source, aerospace, electronics industry, nuclear technology, superconducting technology, etc. However, as a rare earth element, scandium is scattered and independent deposits are extremely rare. Coarse scandium oxide contains impurities Fe, Mg, Ti, Ba, Al, Zr, Mn, etc., Sc 2 o 3 The content is 80~90%. How to enrich scandium at a lower cost during the extraction of scandium to obtain high-purity scandium oxide is an industrial problem. [0003] Chinese patent CN108754156A) discloses a method for extracting and separating iron and scandium in acid leaching solution of red mud, using a long-chain alkyl quaternary ammonium salt extractant to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/28C22B59/00
CPCC22B59/00C22B3/28
Inventor 孙国新彭修静赵奕铭崔玉
Owner UNIV OF JINAN