METHOD OF REPROCESSING OF STRONTIUM CONCENTRATE TO STRONTIUM CARBONATE Russian patent published in 1994 - IPC

FIELD: chemical technology. SUBSTANCE: method involves leaching of concentrate with nitric acid preparing strontium-containing precipitate, transfer of strontium salts to the solution by precipitate treatment with reused aqueous solution, separation and washing off of coarse-dispersed part of insoluble residue from strontium nitrate solution, desalting of strontium nitrate crystals from solution containing fine-dispersed part of residue by nitric acid feeding. Then prepared crystals are purified from impurities by countercurrent contacting with nitric acid in ascending flow following by dehydration of prepared crystals, their dissolving and precipitation of the end strontium carbonate. EFFECT: method ensures to decrease strontium loss and prepare the product with enhanced purity degree. 2 cl, 3 tbl