Non-saponification rare earth extraction separation process

A technology of rare earth extraction and separation without saponification, which is applied in the field of metallurgy and chemical industry, can solve the problems of reducing production costs, achieve the effects of reducing production costs, solving the discharge of ammonia nitrogen wastewater, and reducing emissions

Active Publication Date: 2012-11-07
宁夏同乐新材料科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem of ammonia nitrogen wastewater produced by saponification in the existing extraction system, the present invention provides a non-saponification rare earth extraction and separation process
Use the compound solvent of P507 or P204 acidic phosphine extractant and amine extractant such as N235 as a composite extractant. This extractant can directly extract and separate rare earths without saponification, thus solving the problem of using ammonia saponification at the source. And the problem of producing a large amount of...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] LaCl with a concentration of 1mol / L and pH=3 3 The solution is a feed liquid, respectively, using ammonia saponified P507 (the ratio of P507 to kerosene is 1:1, the saponification rate is 36%) extractant, and the composite extractant composed of P507-N235-kerosene (the volume ratio of P507 accounts for 30 %, 25% by volume of N235 and 45% by volume of kerosene), mix with the above feed liquid at O / A=1:1 and shake for 8min. The distribution of La under different extraction systems is shown in Table 1:

[0027] Extraction system

P507 saponification system

P507-N235 system

Allocation ratio

0.1486

0.1248

[0028] For the P507-N235 composite extractant loaded with lanthanum, 5mol / L hydrochloric acid was used for back extraction, compared with O / A=5:1, after 5 stages of countercurrent back extraction, the back extraction rate was 99%. The acidity of the outlet rare earth material liquid is 0.1~0.2mol / L, and the rare earth concentration is 0.8mol / L.

[0029] This example s...

Embodiment 2

[0031] Take Nd (NO) with a concentration of 1 mol / L and pH=3 3 ) 3 The solution is a feed liquid, and the P507 (volume ratio of P507 to kerosene is 1:1, and the saponification rate is 36%) extracted with ammonia saponified, and a composite extractant composed of P507-N235-kerosene (the volume ratio of P507 is 30%, The volume ratio of N235 is 25%, and the volume ratio of kerosene is 45%), mix with the above-mentioned material liquid at O / A=1:1, and shake for 8 minutes. The distribution of Nd under different extraction systems is shown in Table 2:

[0032] Extraction system

P507 saponification system

P507-N235 system

Allocation ratio

0.1777

0.1574

[0033] For the P507-N235 composite extractant loaded with neodymium, 5mol / L nitric acid was used for back extraction, compared with O / A=5:1, after 5 stages of countercurrent back extraction, the back extraction rate was 99%. The acidity of the outlet rare earth material liquid is 0.1-0.2 mol / L, and the rare earth concentration ...

Embodiment 3

[0036] Take Y with a concentration of 0.18 mol / L and pH=3 2 (SO 4 ) 3 The solution is the feed liquid, and Huanghua kerosene is used as the diluent of the organic phase. P507 (the volume ratio of P507 is 30%) with an ammonia saponification rate of 20%, 30% P507-30% N235-40% kerosene compound extractant , Mix with the above-mentioned material liquid at O / A=1:1, shake and extract for 10 minutes. The distribution of Y under different extraction systems is shown in Table 3 below:

[0037] Type of extractant

Saponification 20% P507

Compound extractant

Y distribution ratio

2.437

1.553

[0038] Using 5mol / L hydrochloric acid to back-extract yttrium-loaded P507-N235 composite extractant, compared to O / A=5:1, after 5-stage countercurrent back-extraction, the back-extraction rate reached 98%.

[0039] The example shows that the compound extraction composed of P507-N235-kerosene can extract heavy rare earth elements.

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PUM

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Abstract

The invention belongs to the field of metallurgy chemical engineering and relates to a novel non-saponification rare earth extraction separation process by using a composite type extracting agent. According to the non-saponification rare earth extraction separation process, a composite solvent which is formed by mixing a P507 or P204 acidic phosphorous extracting agent and an amine extracting agent such as an N235 amine extracting agent is used as the composite type extracting agent, and the extracting agent is not required to be saponified and can be directly used for extracting rare earth, so that the problem that a large amount of ammonia containing waste water is generated during an extraction process due to the fact that ammonia is used for saponifying the extracting agent is thoroughly solved, simultaneously, the usage of ammonia alkali and acid is greatly reduced, and production costs are reduced.

Description

Technical field [0001] The invention belongs to the field of metallurgy and chemical engineering, and relates to a new process for the non-saponification extraction and separation of rare earths with a composite extractant. That is, the rare earth solution after the acid-dissolved rare earth ore is used as the material liquid, and the mixed solvent of a certain ratio of acidic phosphine extractant and basic amine extractant is used as the organic phase, without the need for saponification to directly extract and separate the rare earth. Background technique [0002] At present, my country's rare earth separation enterprises mainly use solvent extraction to separate rare earth elements. The extraction agent mainly uses P507, P204, etc. The extraction systems include P507-hydrochloric acid system, P507-nitric acid system and P204-sulfuric acid system. P204 and P507 are both acidic phosphine extractants and are weakly acidic. They are often dimer molecules (HA) in non-polar solvent...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B59/00
CPCY02P10/20
Inventor 杨幼明聂华平邓声华杨斌叶信宇谢芳浩蓝桥发黄振华沈文明
Owner 宁夏同乐新材料科技有限责任公司
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