High-purity europium oxide production technology adopting linkage extraction

A production process and technology of europium oxide, applied in the field of high-purity europium oxide production process, can solve the problems of large sum of organic phase and water phase, high acid and alkali consumption, large amount of rare earth pressing, etc., and achieves low equipment requirements and reduced Acid-base consumption and low acid-base consumption during operation

Inactive Publication Date: 2020-08-04
中稀(宜兴)稀土新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional separation process is an aqueous phase feed and three-outlet process, with two process characteristics: one is high acid and alkali consumption, and a large amount of extraction and washing is required to produce a Eu% partition enrichment greater than 50% and 99.99% high Purity gadolinium chloride product; second, the amount of rare earth pressing tank is large. Due to the need for a large amount of extraction and washing, the sum of the organic phase and the water phase is relatively large. In order to meet the requirements of the mixing time process, the extraction equipment must be enlarged. After the enlargement, the inherent pressure tank volume of rare earth is increased. In order to achieve low acid and alkali consumption during process operation, the rare earth tank volume is reduced; we propose a high-purity europium oxide production process using linkage extraction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A high-purity europium oxide production process using linkage extraction, comprising the following steps:

[0020] S1: The rare earth oxide-containing waste is leached in multi-stage countercurrent with strong acid, and filtered to obtain a leach solution containing rare earth ions;

[0021] S2: heating the leaching solution obtained in S1, and then adding a precipitating agent to obtain a mixed reaction system, adjusting the pH value of the mixed reaction system to 7, and obtaining a white crystal precipitate;

[0022] S3: the white crystal precipitate in S2 and the mother liquor are left to age, and the white precipitate after standing and aging is filtered through a precision filter, and washed with water after filtering;

[0023] S4: The washed slag is chlorinated and leached with chlorine gas, soluble chlorate or soluble hypochlorite in an acidic solution with a pH value of 3 at 60°C, washed again and the leaching solution is mixed with the slag. separation;

[0...

Embodiment 2

[0032] A high-purity europium oxide production process using linkage extraction, comprising the following steps:

[0033] S1: The rare earth oxide-containing waste is leached in multi-stage countercurrent with strong acid, and filtered to obtain a leach solution containing rare earth ions;

[0034] S2: heating the leaching solution obtained in S1, and then adding a precipitating agent to obtain a mixed reaction system, adjusting the pH value of the mixed reaction system to 7.2 to obtain a white crystal precipitate;

[0035] S3: the white crystal precipitate in S2 and the mother liquor are left to age, and the white precipitate after standing and aging is filtered through a precision filter, and washed with water after filtering;

[0036] S4: The washed slag is chlorinated and leached with chlorine gas, soluble chlorate or soluble hypochlorite in an acidic solution with a pH value of 3.5 at 70°C, washed again and the leaching solution is mixed with the slag separation;

[003...

Embodiment 3

[0045] A high-purity europium oxide production process using linkage extraction, comprising the following steps:

[0046] S1: The rare earth oxide-containing waste is leached in multi-stage countercurrent with strong acid, and filtered to obtain a leach solution containing rare earth ions;

[0047] S2: heating the leaching solution obtained in S1, and then adding a precipitating agent to obtain a mixed reaction system, adjusting the pH value of the mixed reaction system to 7.5 to obtain a white crystal precipitate;

[0048] S3: the white crystal precipitate in S2 and the mother liquor are left to age, and the white precipitate after standing and aging is filtered through a precision filter, and washed with water after filtering;

[0049] S4: The washed slag is chlorinated and leached with chlorine gas, soluble chlorate or soluble hypochlorite in an acidic solution with a pH value of 4 at 80°C, washed again and the leaching solution is mixed with the slag. separation;

[0050...

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Abstract

The invention discloses a high-purity europium oxide production technology adopting linkage extraction. The production technology comprises the steps of counter current leaching, heating precipitation, filtering washing, solution washing, solution stripping and fuzzy linkage extraction. The technological design is more scientific and reasonable, the high-purity europium oxide production technologyadopts fuzzy linkage extraction and solution washing and stripping shared technology, the rare earth element exchange function is sufficiently utilized, and the separation effect can be improved. Thehigh-purity europium oxide production technology has the advantages that investment is small, the equipment requirement is low, operation acid-base consumption is low, acid-base consumption can be lowered, the rare earth pressure tank amount is effectively lowered, and the product quality stability is improved.

Description

technical field [0001] The invention relates to the technical field of rare earth purification, in particular to a high-purity europium oxide production process using linkage extraction. Background technique [0002] During the extraction and separation process, the raw ore rare earth chloride feed liquid passes through the front grouping process production line to obtain the SmEuGd mixed rare earth chloride feed liquid that meets the required purity. To produce 99.99% high-purity gadolinium chloride product, it must be re-separated. The traditional separation process is an aqueous phase feed and three-outlet process, with two process characteristics: one is high acid and alkali consumption, and a large amount of extraction and washing is required to produce a Eu% partition enrichment greater than 50% and 99.99% high Purity gadolinium chloride product; second, the amount of rare earth pressing tank is large. Due to the need for a large amount of extraction and washing, the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/26C22B3/38
CPCC22B59/00C22B3/26C22B3/3846Y02P10/20
Inventor 张玉良白小云费建国吕刚
Owner 中稀(宜兴)稀土新材料有限公司
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