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Method for separating rare earth sulfate solution by saponifiable extraction

A rare earth sulfate and extraction technology is applied in the field of metallurgy and chemical industry to achieve the effects of reducing production costs, stabilizing the process and shortening the production process.

Active Publication Date: 2012-01-11
CHINA MINMETALS BEIJING RES INST OF RE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] Aiming at the extraction and separation problem of rare earth sulfate in the prior art, the object of the invention is to provide a kind of method of saponification extraction separation rare earth sulfate solution

Method used

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  • Method for separating rare earth sulfate solution by saponifiable extraction
  • Method for separating rare earth sulfate solution by saponifiable extraction

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1. carry out extraction and separation experiment in 8 grades of 300L extraction tanks, extraction agent is P204-kerosene, and feed liquid is the Baotou mine sulfate rare earth solution after magnesia neutralization. The organic phase is added to the first stage of the extraction tank, the saponification agent is sodium hydroxide and added to the second stage of the extraction tank, the third to sixth stages are the blocking agent magnesium sulfate solution, and the magnesium-containing rare earth sulfate is added as the soap material at the eighth stage. The results show that the rare earth sulfate double salt is not formed in the extraction tank, the production process can continue continuously, and the organic phase rare earth loading can meet the production requirements.

Embodiment 2

[0048] Embodiment 2. Carry out extraction separation experiment in 10 grades of 100L extraction tanks, extraction agent is P507-kerosene. The feed solution is sulfuric acid leaching solution of NdFeB waste material containing divalent iron element. All extraction tanks are sealed to prevent oxidation of ferrous iron. The organic phase is added to the first stage of the extraction tank, the saponification agent is ammonia water and added to the second stage of the extraction tank, the third to eighth stages are the blocking agent magnesium sulfate and ferrous sulfate solution, and the rare earth sulfate containing ferrous iron is added at the tenth stage as Soap material. The results show that no rare earth sulfate double salt is formed in the extraction tank, the production process can continue, and the organic phase rare earth load meets the production requirements.

Embodiment 3

[0049] Embodiment 3. Carry out extraction and separation experiments in 10-stage 100L extraction tanks, the extraction agent is P204-P507-kerosene, and the feed liquid is samarium-europium-gadolinium sulfate. The organic phase is added to the first stage of the extraction tank, and the saponification agent is ammonia water-sodium hydroxide mixed solution is added to the second stage of the extraction tank, and the third to eighth stages are blocking agents aluminum sulfate and magnesium sulfate solutions, and aluminum-containing sulfuric acid is added to the tenth stage Rare earth solution, the results show that no rare earth sulfate double salt is formed in the extraction tank, the production process can continue, and the organic phase rare earth load meets the production requirements.

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Abstract

The invention relates to a method for separating rare earth sulfate solution by saponifiable extraction with ammonia water or liquid caustic soda and belongs to the field of metallurgic chemistry. In the method, Mg<2+>, Fe<2+> or Al<3+> intermediate ions, which serve as a blocker, are introduced to participate in exchange, so the direct contact between ammonium or sodium ions and the rare earth sulfate solution is prevented and the problem of the generation of a complex salt of the ammonium or sodium ions and the rare earth sulfate in a sulfuric acid system extraction separation process is solved. When the method for separating the rare earth sulfate solution by saponifiable extraction is used, the rare earth sulfate solution separation flow can be shortened, the rare earth yield is improved, and the consumption of reagents such as acids and alkalis are reduced.

Description

technical field [0001] The invention belongs to the field of metallurgy and chemical industry, and relates to a method for extracting and separating rare earth sulfate raw materials, and is especially suitable for extracting and separating rare earth sulfate solutions under saponification conditions with extractants such as P507, P204, Cyanex272, and naphthenic acid used for saponification of liquid caustic soda or ammonia water. Background technique [0002] my country's rare earth resources rank first in the world, and the main minerals include Baotou mine, Sichuan mine and southern ion-adsorption mine. In addition to rare earth minerals, a large number of secondary resources with high recycling value are also produced in the process of rare earth production and processing, such as NdFeB recycling waste, phosphor waste, etc. With the development of science and technology, the application range of rare earth is more and more extensive, so the demand for a single high-purity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/40C22B59/00
CPCY02P10/20
Inventor 廖春生吴声张玻王嵩龄
Owner CHINA MINMETALS BEIJING RES INST OF RE
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