关键词: 磷矿, 稀土, 浮选

Abstract: The effects of depressor kind and dosage, collector WF-01 dosage, flotation time, pulp concentration and particle size fraction of sample on P2O5 grade and recovery rate of concentrate from Xinhua rare earths-bearing phosphorite ore were investigated by reverse flotation technology. The rare earths of concentrate and tailings obtained in optimum flotation conditions were also analyzed. The results show that with WF-01 as the collector of dolomite minerals and other gangue minerals, industrial sulphuric acid is not suitable to be used singly as the depressor of phosphate minerals, while the better flotation result and enrichment of rare earths can be obtained when industrial phosphoric acid is used instead of industrial sulphuric acid. The optimum conditions obtained from the experiments are industrial phosphoric acid of 9 kg/t, WF-01 dosage of 0.8 kg/t, flotation time of 9 min, slurry concentration of 35% and particle size (-74 mm) fraction of 82%. In these conditions, P2O5 grade of concentrate can be increased from raw ore of 21.71% to more than 32% and P2O5 recovery rate comes up to 90%. The rare earths can be mainly enriched in concentrate by reverse flotation. The enrichment ratio of rare earths in concentration is 1.56 and the distribution proportion in concentrate is 87.09%.

Key words: phosphorite, rare earths, flotation