METHOD FOR PRODUCTION OF PHOSPHORITE PELLETS Russian patent published in 1996 - IPC

FIELD: technology of phosphate materials. SUBSTANCE: phosphate raw materials together with fluxing additives are used as origin materials. Easily fusible and difficulty fusible compounds are used as said fluxing additives. If module of acidity of phosphate raw materials is 0.4-0.8 then mixture of phosphate raw materials and fluxing additive is prepared so that ratio of easily fusible and difficulty fusible compounds in said mixture is 0.08-0.12, total oxides of alkaline metals being 0.02-0.05. If module of acidity of phosphate raw materials is 0.8-1.2 then mixture of phosphate raw materials and fluxing additive is prepared so that ratio of easily fusible and difficulty fusible compounds in said mixture is 0.12-0.16, total oxides of alkaline metals being 0.05-0.08. Thus prepared mixture is lumped, raw pellets are dried and roasted at 1150-1200 C. Losses of phosphorous during treatment of pellets is 2.3-2.5 %. EFFECT: improves efficiency of the method. 1 tbl