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Process for solvent extraction separation purification of rare earth element

A rare earth element and process method technology, applied in the field of solvent extraction, separation and purification of rare earth elements, can solve the problems of high acid-base consumption, pollution, etc., and achieve the effects of less acid-base consumption, simple and flexible process, and easy back extraction

Active Publication Date: 2008-12-10
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of process method of extracting, separating and purifying rare earth elements from mixed sulfuric acid rare earth solution, and this process method focuses on solving the above-mentioned ammonium bicarbonate transformation or P204 extraction transformation process to have high acid-base consumption, and ammonia nitrogen wastewater to water resources. Pollution and other issues, thereby simplifying the process flow, reducing chemical material consumption and operating costs, and eliminating ammonia nitrogen wastewater pollution

Method used

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  • Process for solvent extraction separation purification of rare earth element
  • Process for solvent extraction separation purification of rare earth element
  • Process for solvent extraction separation purification of rare earth element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The raw material is bastnaesite (REO 60%), and after sulfuric acid roasting, water immersion, neutralization and impurity removal, a mixed rare earth sulfate solution is obtained. The acidity is pH 4, and the main components are REO 0.274mol / L, Fe2 2 o 3 98%, (Sm-Y) 2 o 3 2%; the organic phase is P507 (diluted with kerosene), and its concentration is 1.5mol / L.

[0036] (1) Magnesium oxide is slurried with mixed sulfuric acid rare earth solution and water. In the slurry, the rare earth REO content is 0.121mol / L, and the magnesium oxide content is 0.8wt%. The slurry and the organic phase are mixed to extract the rare earth, and the mixing volume ratio is the extraction agent. / slurry=1 / 1.5, the temperature in the tank is 30°C, after 4 stages of co-flow extraction, 2 stages of clarification, the concentration of REO in the loaded organic phase is 0.179mol / L, and the concentration of REO in the raffinate aqueous phase is 0.001mol / L The recovery rate of L rare earth is 9...

Embodiment 2

[0040] The raw material is bastnaesite and monazite mixed rare earth ore (REO 50%). After sulfuric acid roasting, water immersion, neutralization and impurity removal, a mixed rare earth sulfate solution is obtained. The acidity is pH 4.5, and the main component is REO 0.243mol / L , Fe2 2 o 3 76%, (PrNdSm-Y) 2 o 3 24%; the organic phase is a synergistic extractant (diluted with kerosene) composed of 60% P507 and 40% P204, and its concentration is 1.3mol / L.

[0041] (1) The organic phase is mixed with the mixed rare earth sulfuric acid solution and light burnt magnesite to extract the rare earth. The magnesium oxide content in the water phase is 1.6wt%, and the mixing volume ratio is extractant / water phase=1.5 / 1. flow, 2-stage counter-current extraction, 2-stage clarification, the concentration of REO in the loaded organic phase is 0.161mol / L, the concentration of REO in the raffinate aqueous phase is 0.0005mol / L, and the recovery rate of rare earth is 99.8%.

[0042] (2) L...

Embodiment 3

[0046] The raw material is monazite (REO 60%). After sulfuric acid roasting, water immersion, neutralization and removal of impurities, a mixed rare earth sulfate solution is obtained. The acidity is pH 4.0, and the main components are REO 0.192mol / L, Fe2 2 o 3 76%, (PrNd) 2 o 3 22%, (Sm-Y) 2 o 3 2%; the organic phase is P507 diluted with kerosene, and its concentration is 1.5mol / l.

[0047] (1) Magnesium oxide is slurried with a mixed sulfuric acid rare earth solution, and the magnesium oxide content is 1.27wt% in the slurry, and the slurry and the organic phase are mixed to extract the rare earth, and the mixing volume ratio is extractant / slurry=1 / 1, and the temperature in the tank is 35°C, after 3 stages of co-flow, 2 stages of countercurrent extraction, 2 stages of clarification, the concentration of REO in the loaded organic phase is 0.191mol / L, the concentration of REO in the raffinate water phase is 0.001mol / L, 70% raffinate water The recovery rate of rare earth ...

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Abstract

The invention provides a process method for separating and purifying rare earth elements by solvent extraction. The method takes a mixed rare earth sulfate solution obtained from a rare earth ore treated by sulphuric acid as a raw material, directly adopts a nonsaponifiable P507 extraction agent or a synergistic extraction agent containing the P507 to completely extract rare earth in a material liquid into an organic phase, and then takes the organic phase as a rare earth material liquid to extract, separate and purify the rare earth or directly backextract to produce mixed chlorinated rare earth or rare earth nitrate. The process method is simple and flexible, does not saponify the organic phase during the extraction and separation process, does not produce ammonia nitrogen waste water, is easy to backextract middle and heavy rare earths, and has less consumption of acid and base and low production cost.

Description

technical field [0001] The invention relates to a process method for solvent extraction, separation and purification of rare earth elements. Specifically, the mixed rare earth sulfate solution obtained by sulfuric acid decomposition of rare earth ore is used as raw material, and non-saponified P507 (HEH / EHP, 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester) or synergistic extraction containing P507 is directly used The rare earth in the feed liquid is fully extracted into the organic phase, and then the organic phase is used as the rare earth feed liquid for rare earth extraction and separation or direct back extraction to produce mixed rare earth chloride or rare earth nitrate. Background technique [0002] Rare earths are composed of 15 lanthanide elements (lanthanum La cerium Ce promethium Pm praseodymium Pr neodymium Nd samarium Sm europium Eu gadolinium Gd terbium Tb dysprosium Dy holmium Ho erbium Er thulium Tm lutetium Lu) and scandium Sc yttrium Y a total of 17 el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/26C22B3/08C22B59/00
CPCY02P10/20
Inventor 黄小卫龙志奇李红卫彭新林刘营张永奇李建宁赵娜
Owner GRIREM ADVANCED MATERIALS CO LTD
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