Abstract: In order to effectively utilize the slime produced in the course of producing -3 mm production in a pyrite concentrator from Guangdong province, carried out the pilot test of once roughing once cleaning column flotation by two φ400 mm×4 000 mm cyclone static micro-bubble flotation columns.Suitable handling capacity, reagent system and circulating pump pressure of flotation column were determined by conditions test.After 72 h continous production, the S concentrate with 48.46% grade, 93.71% recovery was achineved, comparing to the spot flotation machine, the S recovery increased by 13 percentage ponits.

Key words: Pyrite slime, Cyclone-static micro-bubble floatation column, Pilot test