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Process for enriching and preparing high-purity scandium by use of oxyl substituted acetic acid as extractant

The technology of extracting agent and alkoxy group is applied in the field of rare earth metal separation technology in hydrometallurgy, which can solve the problems of complex composition, emulsification and high water solubility, and achieve the effects of overcoming emulsification, good quality and easy preparation.

Inactive Publication Date: 2003-02-19
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

However, production practice shows that because naphthenic acid is a by-product in petroleum, its composition is complex and its water solubility is large. After long-term use, the composition of the extractant will change, and due to the high pKa value, it is necessary to extract rare earths at a high pH value. , so it is easy to produce emulsification phenomenon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Extractant: 0.40mol / L sec-octylphenoxy substituted acetic acid-10% methylheptanol-kerosene, the degree of ammoniation is 91%, the concentration of rare earth chloride feed solution is 1.0mol / L, pH=3.0, and Y accounts for 35.3% (percentage by weight), Tb-Lu accounts for 13.1%, La-Gd accounts for 51.4%, Sc accounts for 0.1%, pickling acid 1.9mol / L HCl, flow ratio is organic phase: material liquid: pickling acid: reverse acid=1.34:1 : 0.25; through 5 stages of extraction, 2 stages of washing, the result is: the purity of Sc in the organic phase is 11.1%, and the yield is 92.1%, wherein the contents of various rare earth elements are as shown in Table 1:

[0018] La

Embodiment 2

[0020] Extractant 0.60mol / L sec-nonylphenoxy substituted acetic acid-20% mixed alcohol (C 6 -C 10 )-sulfonated kerosene, degree of ammoniation 80%, concentration of rare earth feed solution is 1.0mol / L, pH=3.0, content of Sc is 0.225%, content of other rare earths is the same as Example 1, acid washing is 0.95mol / LHNO 3 , organic phase, feed liquid, the flow ratio of washing acid is 1.02: 1: 0.49; Through 5 stages of extraction, 2 stages of washing, the results are shown in Table 2, wherein, the purity of Sc in the organic phase is 29.0%, and the yield is 94.7% .

[0021] La

Embodiment 3

[0023] The composition and concentration of the extractant are the same as in Example 1, the rare earth concentration in the scandium-rich feed solution is 1.0mol / L, pH=3.0, the scandium content is 11.1%, and the washing acid is 0.95mol / LHNO 3 , organic phase, feed liquid, the flow ratio of washing acid is 1.21: 1: 0.14; Through 6 stages of extraction, 4 stages of washing, the results are shown in Table 3, wherein, the purity of Sc in the organic phase is 99.98%, and the yield is 92.5% .

[0024] La

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PUM

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Abstract

A process for preparing scandium by using oxyl substituted acetic acid as extractant includes adding the said extractant, additive (alcohol mixture) and saponifier chosen from ammonia water, sodium hydroxide, dicarbonate and sodium carbonate to the Sc-contained rare-earth mixture liquid, extracting by 4-10 stages, washing with HCl or HNO3 by 2-8 stages, fraction distilling and mixing for 5-15 min, clarifying at 10-35 deg.C for 10-50 min to obtain Sc-enriched rare-earth, extracting by 5-15 stages and washing by 4-10 stages. Its advantages are high purity (99.99-99.999 wt.%) and high output rate (more than 90%).

Description

technical field [0001] The invention belongs to a class of hydrometallurgical rare earth metal separation technology, in particular to a technology for enriching and preparing high-purity scandium from scandium-containing rare earth by substituting acetic acid with alkoxide as an extraction agent. Background technique [0002] The excellent properties of scandium make it widely used in electric light source, aerospace, electronics industry, nuclear technology, superconducting technology and other important fields. However, due to the high chemical activity of scandium, it is difficult to produce high-purity metals. Therefore, although Nilson discovered scandium as early as 1879, it was not until 1937 that Fisher used molten salt electrolysis to produce metals with a purity of 95%. Scandium, and metal scandium with a purity of 99.9% was produced by Spedding in 1973. The process of enriching, separating and extracting high-purity scandium from raw materials with complex compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26
CPCY02P10/20
Inventor 李德谦王弋戈孟淑兰
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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