METHOD OF SELECTIVE FLOATATION OF PHOSPHORUS MINERALS Russian patent published in 1997 - IPC

FIELD: mineral dressing. SUBSTANCE: ore slurry is treated with alkali agent, pH 7-11, and carbonate and silicate mineral depressor. Collector of succinic acid type in amount from 20 to 2000 g per 1 t of ore and blowing agent are then added. As collector, one or several compounds are added having general formulas: and where R¹ is straight-chain or branched C₈-C₂₄(preferably C₈-C₁₈,R²)-alkenyl or cycloalkyl with 5-6 carbon atoms; M hydrogen, ammonium, alkali or alkali-earth metal atom or NR³R⁴R⁵ group where R³, R⁴, and R⁵, independently, is hydrogen, C₁-C₂₀-alkyl, or hydroxy-C₁-C₂₀-alkyl. Collector or collector mixture, if needed, with co-collectors are used. EFFECT: enhanced efficiency of floatation process. 10 cl, 8 tbl