Cleaning smelting technology of bastnaesite and monazite mixed rare earth ore concentrate

Abstract

The invention relates to a cleaning smelting technology of bastnaesite and monazite mixed rare earth ore concentrate. In the cleaning smelting technology, first, bastnaesite and monazite mixed rare earth ore concentrate is roasted; the roasted products are subjected to acid leaching, and a sulfuric acid leachate containing F<->, Ce <4+>, Th<4+> and trivalent rare earth and leached residues are obtained; the leached residues are washed to be neutral, are dried, and are roasted together with sodium carbonate; the roasted product is subjected to water washing, and a washing liquid and washed residues are obtained; the washed residues are subjected to acid leaching, a sulfuric acid leachate containing a few of F<->, Ce <4+>, Th<4+> and trivalent rare earth is obtained, the sulfuric acid leachates are mixed, Ce and F are recoveried, Th is separated, then grouping separation of trivalent rare earth is achieved further. Through the above flows, integrated and efficient recovery of rare earth oxide and valuable elements fluorine, phosphor and thorium in mixed rare earth ore concentrate can be achieved.

Description

technical field [0001] The invention relates to a clean smelting process of bastnaesite and monazite mixed rare earth concentrate, in particular, the invention relates to the cleaning of rare earth, fluorine, phosphorus, thorium and other resources in bastnaesite and monazite mixed rare earth concentrate Smelting method. Background technique [0002] The Baiyan Obo Mine in Baotou is mainly composed of bastnaesite and monazite, the ratio is about 6:4, and the cerium group elements account for about 98% of the total rare earth elements in the mineral. In addition to rare earths, concentrates contain a large amount of non-rare earth valuable elements, such as fluorine, phosphorus and radioactive thorium (0.2-0.3%), which are worth recycling as resources. Thorium is a radioactive element and a very useful regenerative nuclear fuel. Recycling is of great significance both for resource utilization and environmental protection. At present, Baotou Rare Earth Mine mainly uses conce...

AI Technical Summary

Problems solved by technology

[0007] For the currently operating concentrated sulfuric acid high-temperature roasting method, although it solves the pollution of fluorine in the waste gas and thorium in the waste residue, it fails to realize the recovery of the valuable element phosphorus

In addition, so far, there is no effective extraction process that can effectively recover fluorine, phosphorus and thorium while recovering rare earths

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