Method for recovering rare earth in ion adsorption type rare earth ore leaching solution through fractional precipitation

An ion adsorption type, step-by-step precipitation technology, applied in the direction of improving process efficiency, etc., can solve the problems that the purity of rare earth concentrate products cannot be substantially improved, and achieve the effects of reducing production costs, improving purity, and the process is simple and easy to control

Active Publication Date: 2015-12-09
JIANGXI UNIV OF SCI & TECH
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  • Summary
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AI Technical Summary

Problems solved by technology

However, the research results of the paper "Effect of impurity ion on the preparation of novel saponifier for rare earth extraction" (Jounalofrare earth, Volume 34, Issue 1, 2013) show that in the presence of rare earths, most magnesium compounds cannot be carbonized to form magnesium bicarbonate solution, but instead form magnesium carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 10L of ion-adsorption type rare earth ore leaching solution after impurity removal treatment, its rare earth concentration is 1.5g / L (REO calculation), sulfate radical concentration is 4.0g / L. First, according to 60% of the theoretical amount required for the complete precipitation of rare earth ions in the leachate, add 3.55g of magnesium oxide to the leachate, react at 40°C for 2 hours, and then use the theoretical amount required for the complete precipitation of rare earth ions in the leachate 50%, add 4.14g of calcium oxide to the leaching solution, and react at 40°C for 1 hour. After the reaction, solid-liquid separation is carried out to obtain the rare earth precipitation enrichment and precipitation mother liquor, and the solid-liquid separation takes 20 minutes. The rare earth concentration in the precipitation mother liquor is 0.02g / L (REO calculation), and the rare earth precipitation concentrate is calcined at 800°C to obtain a rare earth concentrate p...

Embodiment 2

[0038] Take 100L of ion-adsorption type rare earth ore leaching solution after impurity removal treatment, the rare earth concentration is 0.2g / L (REO calculation), and the sulfate concentration is 2.0g / L. First, according to 30% of the theoretical amount required for the complete precipitation of rare earth ions in the leachate, add 2.37g of magnesium hydroxide (calculated as magnesium oxide) to the leachate, react at 60°C for 2 hours, and then press the amount of rare earth ions in the leachate 85% of the theoretical amount required for complete precipitation, add 9.39g of calcium hydroxide (calculated as calcium oxide) to the leaching solution, and react at 60°C for 1 hour. After the reaction, solid-liquid separation is carried out to obtain rare earth precipitate enrichment and precipitation mother liquor. The concentration of rare earth in the precipitation mother liquor is 0.005g / L (REO calculation), and the rare earth precipitation enrichment is calcined at 800°C to obta...

Embodiment 3

[0040] Take 100L of ion-adsorption type rare earth ore leaching solution after impurity removal treatment, the rare earth concentration is 0.2g / L (REO calculation), and the sulfate concentration is 2.0g / L. First, according to 13% of the theoretical amount required for the complete precipitation of rare earth ions in the leachate, add 1.03g of magnesium hydroxide (calculated as magnesium oxide) to the leachate, react at 60°C for 2 hours, and then press the rare earth ion in the leachate 102% of the theoretical amount required for complete precipitation, add 11.27g of calcium hydroxide (calculated as calcium oxide) to the leaching solution, and react at 60°C for 1 hour. After the reaction, solid-liquid separation is carried out to obtain rare earth precipitate enrichment and precipitation mother liquor. The concentration of rare earth in the precipitation mother liquor is 0.004g / L (REO calculation), and the rare earth precipitation enrichment is calcined at 800°C to obtain rare e...

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Abstract

The invention discloses a method for recovering rare earth in an ion adsorption type rare earth ore leaching solution through fractional precipitation. According to the method, firstly, a magnesium-containing alkaline compound is added to a purified ion adsorption type rare earth ore leaching solution for a precipitation reaction; and then a calcium-containing alkaline compound is further added for a precipitation reaction, and rare earth precipitation concentrates and precipitation mother liquor are obtained after solid-liquid separation. According to the method, raw materials adopted are cheap and easy to obtain, and the process is simple and easy to control, so that the production cost is lowered; the problem of ammonia and nitrogen pollution in the precipitation process of the ion adsorption type rare earth ore leaching solution is solved; meanwhile, the adding amount of the magnesium-containing/calcium-containing alkaline compound is controlled, so that a precipitant is dissolved fully as much as possible, and the purity of the rare earth precipitation concentrates is improved; in addition, sulfate ions and calcium ions in the leaching solution can form a small amount of calcium sulfate precipitate with the good crystallization property; crystals of rare earth hydrate can be induced, and the problem that the rare earth hydrate is not liable to form a crystal form precipitate can be also solved.

Description

technical field [0001] The invention relates to the field of rare earth hydrometallurgy, in particular to a method for step-by-step precipitation recovery of rare earth in leach solution of ion-adsorption type rare earth ore. Background technique [0002] Since the 1970s, the strategic position of rare earth elements has been increasing day by day, and has become an indispensable and important strategic resource in the process of high-tech development and traditional industry transformation. It is known as the "vitamin of modern industry" and "treasure house of new materials". Developed countries such as the United States and Japan have listed rare earths as "strategic elements in the 21st century" for strategic reserves and key research; my country has also listed rare earth materials as Priority themes and key support directions for basic raw materials in the manufacturing industry. [0003] According to the differences in physical and chemical properties among rare earth ...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/44
CPCY02P10/20
Inventor 肖燕飞黄莉徐志峰杨凤丽叶信宇
Owner JIANGXI UNIV OF SCI & TECH
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