METHOD OF INCREASING FILTRUMENESS OF PULP IN SULFURIC ACID PROCESSING OF EVDIALITE CONCENTRATE Russian patent published in 2017 - IPC C22B59/00 C22B34/14 C22B3/08 

FIELD: chemistry.

SUBSTANCE: invention can be used to produce rare metals (R3M). The method of extracting rare-earth elements and zirconium during the processing of eudialyte concentrate includes treatment of the eudialyte concentrate with sulfuric acid supplemented with sodium fluoride. Next, the separation is carried out by filtering the insoluble precipitate, washing it, and feeding the solution after washing and acid opening to a separation of the extraction separation of REE and zirconium cations. When sodium fluoride is added to the molar ratio F: Zr=3, the amorphous structure of silica gel breaks down.

EFFECT: improved pulp filterability without loss of recovery of zirconium and rare metals.

1 dwg, 1 ex