Method for separating and recycling uranium, thorium and rare earth in rare earth mineral decomposition residue

A technology for separation and recovery of rare earth ore, applied in the field of separation and recovery of rare earth, uranium and thorium in the decomposition residue of rare earth ore, can solve the problems of large influence of operators, high cost of extraction agent, large volume of leaching solution, etc. Simple structure and low energy consumption

Active Publication Date: 2015-04-08
YIYANG HONGYUAN RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has the following defects: low acidity, low leaching rate, large volume of leaching solution, resulting in increased investment costs; P204 and N1923 are used to extract and separate thorium and rare earths, and the extraction method will cause three-phase extraction, which will affect the extraction operation. The extraction syste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The separation and recovery method of uranium, thorium and rare earth in the rare earth ore decomposition residue of the present embodiment comprises the following steps:

[0022] (1) Acid leaching: According to the ratio of the mass of rare earth ore decomposition residue to the volume ratio of sulfuric acid solution of 1:5, unit: kg / L, the rare earth ore decomposition residue is added to the sulfuric acid solution with a concentration of 1mol / L. In the reaction kettle of the solution, stir for 2 hours; add the polyacrylamide aqueous solution with a mass fraction of 2‰ according to the ratio of the volume ratio of the polyacrylamide aqueous solution to the leaching solution of 1:1000, flocculate and precipitate, let it stand for clarification, and siphon the supernatant to obtain Solutions containing uranium, thorium, and rare earth valuable elements;

[0023] Pump the slurry after siphoning the supernatant into the air gun, and filter it into the plate and frame filte...

Embodiment 2

[0037] In step (1) of this embodiment, according to the ratio of the mass of rare earth ore decomposition residue to the volume ratio of sulfuric acid solution of 1:8, unit: kg / L, the rare earth ore decomposition residue is added to the tank with a concentration of 1.2mol / L sulfuric acid solution in the reaction kettle, stirring for 2 hours; then add the polyacrylamide aqueous solution with a mass fraction of 2‰ to flocculate and precipitate according to the volume ratio of the polyacrylamide aqueous solution and the leaching solution at a ratio of 1:800, let it stand for clarification, and siphon the supernatant liquid to obtain a solution containing uranium, thorium, and rare earth valuable elements;

[0038] Pump the slurry after siphoning the supernatant into the wind gun, and filter it into the plate and frame filter press by the wind gun until no solution flows out, add water to wash to pH = 4, and combine the filtrate, washing liquid and siphon supernatant , to obtain ...

Embodiment 3

[0042] In the step (1) of this embodiment, according to the ratio of the mass of rare earth ore decomposition residue to the volume ratio of sulfuric acid solution of 1:12, unit: kg / L, the rare earth ore decomposition residue is added to a container with a concentration of 1.5mol / L sulfuric acid solution in the reaction kettle, stirred for 5 hours; then according to the volume ratio of the polyacrylamide aqueous solution and the leachate, the volume ratio was 1:700, adding the polyacrylamide aqueous solution with a mass fraction of 2‰ for flocculation and precipitation, standing for clarification, and siphoning the supernatant liquid to obtain a solution containing uranium, thorium, and rare earth valuable elements;

[0043] Pump the slurry after siphoning the supernatant into the wind gun, and filter it into the plate and frame filter press by the wind gun until no solution flows out, add water to wash to pH = 4, and combine the filtrate, washing liquid and siphon supernatant...

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PUM

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Abstract

The invention discloses a method for separating and recycling uranium, thorium and rare earth in rare earth mineral decomposition residue. The method comprises the following steps: carrying out acid leaching, carrying out pressure filtration, absorbing and recycling uranium by using anion resin, separating and recycling thorium and rare earth by suing cationic resin. The method specifically comprises the following steps: leaching rare earth mineral decomposition residue by using inorganic acid; carrying out pressure filtration on the leached slag, washing the leached slag to obtain a clear material solution, absorbing uranium element of the leached material solution by using 201*7 type resin, separating elements thorium and rare earth of an uranium-removal material by using 001*7 type resin, separating and purifying uranium, thorium and rare earth, then washing, complexing, eluting, precipitating and concentrating to obtain products comprising heavy oleate, thorium nitrate and rare earth carbonate and obtain products which comprise high-purity uranium, thorium and rare earth. The extracting and recycling process is simple in device structure, low in investment, low in energy consumption and easy to operate; the industrialization is liable to implement; the direct recovery rate is 99%; precious resources can be recycled; the waste is reduced; the environment is protected.

Description

technical field [0001] The invention relates to a comprehensive recovery method for valuable elements in the decomposition residue of rare earth ores, in particular to a separation and recovery method for uranium, thorium and rare earth in the decomposition residue of rare earth ores. Background technique [0002] Rare earth has the reputation of "industrial vitamins" and has become an extremely important strategic resource. At present, rare earth ores mainly include monazite, bastnaesite, xenotime, etc. Monazite is mainly distributed in coastal areas, bastnaesite is mainly distributed in Sichuan, and xenotime is mainly distributed in six southern provinces. The Baotou mine in northern my country is a mixed ore of bastnaesite and monazite. Monazite belongs to light rare earth ore. The current production process is: monazite concentrate is decomposed by alkali, and useful rare earth and phosphorus are extracted from the feed liquid, and the remaining solid product contains...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B60/02
CPCY02P10/20
Inventor 崔小震陈月华郭卫权任萍许鸽鸣朱焱曾志平
Owner YIYANG HONGYUAN RARE EARTH
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