METHOD OF SULPHURIC ACID DECOMPOSITION OF REM-CONTAINING PHOSPHATE RAW MATERIAL

文件类型：PDF文档
文件大小：287K
FIELD : chemistry. SUBSTANCE : invention relates to method of obtaining compounds of rare earth metals (REM) in complex processing of phosphate raw material, in particular apatites. Claimed is method of sulphuric acid decomposition of REM-containing phosphate raw material with concentration of REM in phosphogypsum. Method includes addition of sodium salt, potassium salt or their mixture. Sodium salts are added in amount 0.25-5.0 kg in terms of Na2O, potassium salts - in amount 0.25-5.0 kg in terms of K2O, and their mixture - in amount 0.25-5.0 kg in terms of Na2O and K2O per 1 kg of REM in terms of REM oxides in composition of phosphate raw material. EFFECT : increased degree of REM concentration in phosphogypsum due to increase of REM transition into phosphogypsum to 98%. 2 cl, 6 ex