Method for non-saponification extraction and separation of light rare earth elements

A light rare earth element, non-saponifiable technology, applied in the field of hydrometallurgy, can solve the problems of poor fluidity, long phase separation time, and large system viscosity, and achieve the effects of reducing production cost, shortening phase separation time, and enhancing fluidity

Active Publication Date: 2014-10-29
GUANGXI NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a method for extracting and separating light rare earth elements without saponification. The method does not need to add saponification agent to pretreat the acidic phosphorus-type extractant so as to avoid the discharge of waste water such as ammonia nitrogen, and does not need to increase the volume of the extraction tank. It does not introduce other ions into the extraction system, and at the same time, it can solve the problems of high viscosity, poor fluidity, and long phase separation time of the acidic phosphorus-type extractant-basic amine extractant system. The added extractant can be recycled and can be used for Extraction and Separation of Light Rare Earth Elements

Method used

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  • Method for non-saponification extraction and separation of light rare earth elements

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Embodiment 1

[0026]Add P507—N235-200# solvent oil composite type extractant in airtight stirred kettle, wherein the volume percentage of P507 is 30%, the volume percentage of N235 is 35%, and the volume percentage of 200# solvent oil is 35%; At 45°C, add a solvent consisting of tributyl phosphate and isooctyl alcohol at a flow rate of 0.03L / min, wherein the volume percentage of tributyl phosphate is 80%, and the volume percentage of isooctyl alcohol is 20%; the solvent is added The total amount is 15% of the compound extraction dosage, and stirred for 1 hour. Stop stirring, introduce the mixed organic phase into the extraction tank, and chlorinate 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: 1.5) Carry out LaCe / PrNd extraction grouping, as follows figure 1 The process shown is for extraction, washing, and stripping operations, wherein the ratio of the extraction section (organic phase: water phase) is controlled at 1:1, ...

Embodiment 2

[0031] Add P204—N1923-260# solvent oil composite type extractant in airtight stirred tank, wherein the volume percentage of P204 is 40%, the volume percentage of N1923 is 30%, the volume percentage of 260# solvent oil is 30%; At 70°C, add a solvent consisting of trioctyl phosphate and n-amyl alcohol flowing in at a flow rate of 0.05L / min, wherein the volume percentage of trioctyl phosphate is 60%, and the volume percentage of n-amyl alcohol is 40%; The amount is 10% of the compound extraction dosage, and stirred for 0.5h. Stop stirring, introduce the mixed organic phase into the extraction tank, and mix the rare earth chloride feed solution containing La and Ce (the concentrations of La and Ce are 45g / L and 3g / L respectively, and the pH of the feed solution: 1.9) according to the attached figure 1 The process shown is for extraction, washing, and back-extraction operations, wherein the ratio of the extraction section (organic phase: water phase) is controlled to 2:1, the extra...

Embodiment 3

[0036] Add P507—N235-200# solvent oil compound type extractant in airtight stirred tank, wherein the volume percentage of P507 is 50%, the volume percentage of N235 is 25%, and the volume percentage of 200# solvent oil is 25%; 35°C, add a solvent composed of trioctyl phosphate and isooctyl alcohol at a flow rate of 0.01L / min, wherein the volume percentage of trioctyl phosphate is 90%, and the volume percentage of isooctyl alcohol is 10%; the solvent is added The total amount is 20% of the compound extraction dosage, and stirred for 4 hours. Stop stirring, introduce the mixed organic phase into the extraction tank, and mix the rare earth chloride feed liquid containing Pr and Nd (wherein the concentrations of Pr and Nd are 9g / L and 35g / L respectively, and the pH of the feed liquid: 4) according to the attached figure 1 The shown flow process carries out extraction, washing, stripping operations, wherein, the ratio of extraction section (organic phase: water phase) is controlled...

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Abstract

The invention discloses a method for non-saponification extraction and separation of light rare earth elements. After a compound extraction agent consisting of acid phosphorus type extraction agent, alkaline amine type extraction agent and solvent oil is mixed with phosphate solvent or organic alcohol solvent at 30-70 DEG C, chlorinated light rare earth liquid is extracted and separated; and the water washing and the hydrochloric acid reverse extraction are performed to finally realize the separation of La, Ce, Pr and Nd; and a mixed organic phase after the reverse extraction is returned to an extraction tank for recycling. The method pretreats the mixed organic phase consisting of the compound extraction agent and the solvent, so that such defects as high viscosity, weak mobility, easy emulsification and long phase splitting time are overcome; the method has no need to saponify the acid phosphorus type extraction agent, so that no alkali liquor consumption and no waste water emission in the extraction process are realized, but the separation capacity of a saponification extracting agent system is achieved, and the extraction grade is reduced compared with that needed by the saponification extracting agent system; and the method is a rare earth element separation process with economy and high efficiency.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy and relates to a method for extracting and separating light rare earth elements from rare earth feed liquid. Background technique [0002] my country's rare earth resources are very rich, and its reserves and output rank first in the world. It is of great significance to develop my country's rare earth resources. In rare earth ores, the content of light rare earth elements such as La, Ce, Pr, and Nd is relatively high; for the southern ion-adsorption type rare earth ores, the content of light rare earth elements is as high as 50%, so the separation of light rare earth elements is the best choice for southern rare earth ores. Focus on developing smelting. [0003] The commonly used separation method of rare earth elements is solvent extraction. After decades of research in my country, a rare earth extraction and separation system composed of acidic phosphorus-type extractant P507 or P204 and solven...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/40C22B59/00
CPCY02P10/20
Inventor 刘葵陈星新陈珊梅龙华邝丽芳
Owner GUANGXI NORMAL UNIV
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