RESEARCH AND DEVELOPMENT OF REGIMES OF THICKENING AND FLOTATION OF SLUDGE CLASSES OF STALE TAILS

DOI:10.24411/0869-5997-2020-10007

Abstract

The choice of flocculant a nd d ispersant r eagents f or t hickening a nd d efloculation of sl udge cl asses of st ale ta ils at their flotation enrichment is proved by the conducted researches. Use of flocculant «Praestol-2540» at a flow rate of 12 g/t provides the release of condensed product with the required density of 56,5 %. The disadvantage of the regime is the non-selective thickening of sludge with the capture of fine classes of rock minerals, which does not contribute to the effectiveness of the subsequent flotation process. To improve the flotation performance of stale tails, a mode of defloculation of the condensed product was developed, including the supply of soda ash, the reagent «Neonol AF 9-8» and sulfite-alcohol Barda, followed by their Association with sand classes of stale tails, conditioning with a collector and flotation. Feed of reagents-dispersants in the thickened slurry product allows to destroy nonselectively flocculated mineral complexes and to provide effective flotation of grains of phosphate minerals. There provides growth of the content and recovery of phosphorus pentoxide in the concentrate of Apatite flotation at processing of slimmed stale tails respectively on 1,35 and 1,7 %