Non-saponification extracting and separating method for light rare earth element

A light rare earth element and separation method technology, which is applied in the field of washing and stripping in the process of extracting and separating light rare earth elements, can solve the problems of high acidity, unfavorable product handling or separation, etc., achieve low cost of the method, and shorten washing and stripping time , the effect of shortening the extraction process

Active Publication Date: 2015-04-22
GUANGXI NORMAL UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When using the above-mentioned non-saponification extraction method to separate rare earth elements, it is necessary to wash the loaded organic phase with dilute acid and use a higher concentration of acid (3-6mol / L) to back-extract the loaded organic phase, which makes the stripping liquid, The acidity of the washing solution and the blank organic phase after back extraction is very high, especially the acidity of the outlet product of the back extraction solution is higher, which is not conducive to the treatment or separation of subsequent products

Method used

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  • Non-saponification extracting and separating method for light rare earth element
  • Non-saponification extracting and separating method for light rare earth element
  • Non-saponification extracting and separating method for light rare earth element

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Effect test

Embodiment 1

[0016] In the saponification-free extraction and separation method of light rare earth elements, a mixed extractant composed of P507—N235-200# kerosene is added to the first stage of the extraction section, wherein the volume percentage of P507 is 30%, and the volume percentage of N235 is 35%. The volume percentage of 200# kerosene is 35%; the chlorinated light rare earth feed liquid (feed liquid concentration: La 41g / L, Ce 4g / L, Pr 10 g / L, Nd 36 g / L; Feed liquid pH: 1.8), add water in the last stage of stripping section and washing section, according to figure 1 The flow shown is LaCe / PrNd extraction and grouping operation, in which the ratio (O / A) of the extraction section is 1:1, the two-phase residence time is 10min, the ratio (O / A) of the washing section is 2:1, and the two-phase The residence time is 5min, the phase ratio (O / A) of the stripping section is controlled as 1:1.5, and the two-phase residence time is 8min. After 6 stages of extraction, 3 stages of washing, a...

Embodiment 2

[0018] In the saponification-free extraction and separation method of light rare earth elements, a mixed extractant composed of P204—N1923-260# kerosene is added to the first stage of the extraction section, wherein the volume percentage of P204 is 40%, and the volume percentage of N1923 is 30%. The volume percentage of 260# kerosene is 30%; the mixed rare earth chloride feed liquid containing La and Ce is added in the last stage of the extraction section (wherein the concentrations of La and Ce are 40g / L and 4g / L respectively, and the pH of the feed liquid is: 2.3, add water in the last stage of stripping section and washing section, according to the following figure 1 The process shown is for La / Ce separation operation, in which the ratio (O / A) of the extraction section is 2:1, the two-phase residence time is 12min, the ratio (O / A) of the washing section is 2.5:1, and the two-phase residence time is 12 minutes. The time is 3 minutes, the ratio (O / A) of the stripping section...

Embodiment 3

[0020] The non-saponification extraction and separation method of light rare earth elements, adding a mixed type extractant composed of P507—N235-200# solvent oil in the first stage of the extraction section, wherein the volume percentage of P507 is 40%, and the volume percentage of N235 is 25% , the volume percentage of 200# solvent oil is 35%; Add the mixed rare earth chloride feed liquid containing Pr, Nd (wherein the concentration of Pr, Nd is 8g / L and 37g / L respectively, the feed liquid's pH: 4), water is added to the last stage of the stripping section, and 30% (volume %) of the outlet stripping liquid of the last stage of the stripping section is added to the last stage of the washing section, as follows figure 2The process shown is for Pr / Nd separation operation, in which the ratio (O / A) of the extraction section is 3:1, the two-phase residence time is 12min, the ratio (O / A) of the washing section is 1:2, and the two-phase residence time is 1:2. The time is 2 minutes,...

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Abstract

The invention discloses a non-saponification extracting and separating of method for light rare earth element. According to the method, by virtue of a non-saponification extraction agent (organic phase) comprising an acid extraction agent, an alkaline extraction agent and kerosene, chlorinated light rare earth feed liquid is extracted and separated. Water instead of diluted hydrochloric acid or a high-concentration hydrochloric acid is used as a washing agent and a reverse-extraction agent, the stage retention times of the washing section and the reverse-extraction section are controlled so that the blank organic phase after reverse-extraction can be recycled without eluting the acid entrained in the blank organic phase with water, acidities of effluent liquid in the reverse-extraction section and raffinate in the extraction section are low and the subsequent extraction and separation can be performed without neutralizing. According to the method for separating the light rare earth element, the saponification step is not needed and acidic-basic materials are not consumed, the eluting and acid remove steps of the reverse-extraction organic phase are also omitted and thus the production cost is greatly decreased.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and relates to a non-saponification extraction and separation method of light rare earth elements, in particular to a washing and stripping method in the process of extracting and separating light rare earth elements. Background technique [0002] In the ion-adsorption rare earth ores in southern my country, the content of light rare earth elements such as La, Ce, Pr, and Nd is relatively high, and the content of light rare earth elements is as high as more than 50%. The commonly used separation method of rare earth elements is solvent extraction. my country's rare earth industry mostly uses acidic phosphorus-based extractant P507 or P204 to separate light rare earth elements. In order to improve the separation coefficient and extraction rate, the rare earth extraction process usually uses alkaline substances such as ammonia or sodium hydroxide or calcium hydroxide to saponify acidic extractants s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B59/00C22B3/40
CPCY02P10/20
Inventor 刘葵苏露露梁海敏罗意姗陈星新邝丽芳龙华
Owner GUANGXI NORMAL UNIV
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