METHOD FOR INTEGRATED PROCESSING OF LOW-GRADE PHOSPHATE MATERIAL FROM UNECH DEPOSIT

摘要

FIELD: mining industry.;SUBSTANCE: invention relates to processing of phosphorite concentrates obtained when concentrating phosphate-titanium-zirconium sands of Unich-Krapiveno zone. Integrated processing method is characterized by that decomposition is accomplished with acids whose anions do not form solid phase with cations of acid-soluble minerals at ratio of P₂O₅ of raw material to acid hydrogen ions equal to 9-18 and temperature is varied such that degree of decomposition of raw material were at least 98%. Obtained pulp is thickened to give precipitate, which is separated and washed in one or more steps to achieve degree of washing-out at least 98%. Solution is processed into fertilizer and precipitate is routed to be processed into rutile and/or ilmenite concentrate. Acid reagent is selected from nitric acid, hydrochloric acid, and nitric-phosphoric acid mixture, the latter being recycle solution obtained in nitrogen-phosphorus fertilizer production stage.;EFFECT: enabled processing of low-grade phosphate material to form phosphate-containing solutions, which are processed into fertilizer and concentrates containing at least 10% of titanium dioxide and rare-earth metals.;3 cl, 3 ex