METHOD OF PREPARING OF PHOSPHATE RAW MATERIALS FOR ELECTROSUBLIMATION Russian patent published in 1996 - IPC

FIELD: preparing of phosphate raw materials for electrosublimation. SUBSTANCE: phosphate raw materials being affected by caking are dried. The process is carried out with the help of exhaust gases of roasting stage. Then dried raw materials are roasted, and said exhaust gases are treated by finely dispersed phosphate material, its quantity being 400-4000 mg/nm³.. If pH of pulp of mentioned above phosphate material is 9-12, then quantity of said phosphate material is 1000-6000 mg/nm³. If pH of condensate of exhaust gas is 6-3 or 1-3, then phosphate material having pH of pulp 12-14 is added, its quantity being 8000-6000 mg/nm³. Mentioned above exhaust gases contains (mg/nm³: ) fluorine 28, sulfur 50, phosphorous 20. EFFECT: improves efficiency of method.