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

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...

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 system It is an open type, which has a great impact on the operator for the radioactive system; the cost of the extraction agent used in the extraction method is relatively high; the extraction and separation of thorium and rare earth is extensive, and thorium is in the form of thorium hydroxide enrichment Recycling, low utilization value