METHOD OF PROCESSING SCANDIUM-CONTAINING ALUMINOSILICATE RAW Russian patent published in 1995 - IPC

FIELD: chemical technology. SUBSTANCE: scandium-containing aluminosilicate raw is mixed with sodium carbonate and in prepared charge ratio by mass is measured, and at ratio less than 1.5 charge is caked at 950-1050 C. Cake is leached with solution at concentration of Na₂O_caust. 190-230 g/l at the ratio liquid solid (20-25):1 where liquid is solution volume (l), and solid is cake mass (kg). At the ratio at the range 1.5-2.5 caking is carried out at 1000-1150 C, cake is leached with solution at concentration of Na₂O_caust. 150-200 g/l; at liquid solid (10-20):1 and at ratio above 2.5 caking is carried out at 1100-1250 C, cake is leached with solution at concentration of Na₂O_caust. 120-160 g/l; at liquid solid (5-15):1 cake leaching is carried out for 1-6 h, at 40-50 C, slime is separated from solution and fed to the acid decomposition. Scandium is transferred in solution and silica-containing alkaline-aluminate solution after cake leaching is diluted up to concentration of Na₂O_caust. 120-180 g/l, heated up to 80-100 C for 10-60 min, kept for 10-30 min, and separated from zeolite precipitate. EFFECT: improved method of processing. 3 tbl