| 简介 |
The invention relates to methods for extracting rare earth elements, in particular from phosphogypsum. The proposed method involves the acid extraction of rare earth element compounds from phosphogypsum using a solution consisting of a mixture of sulphuric acid and nitric acid in a ratio of 3.2 : 1.2 with a concentration of 1-3 wt% and a liquid to solid ratio of 4 : 5 over a period of 8-12 minutes, while the extraction suspension is agitated and subjected to a hydroacoustic effect. The insoluble gypsum residue is then separated from the extraction suspension and the rare earth element compounds are recovered from the extraction solution by cation exchange sorption with the extraction solution being passed through a cation exchange filter.; The method makes it possible to raise the level of extraction of rare earth elements and halve the time taken to carry out the process, while using smaller concentrations and volumes of acid reagents. |
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