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

摘要： 采用反浮选工艺，研究了抑制剂种类及用量、捕收剂WF-01用量、浮选时间、矿浆浓度和磨矿细度等因素对新华含稀土磷矿浮选效果的影响，并对较佳浮选条件下获得的磷精矿和尾矿进行了稀土分析. 结果表明，浮选剂选用WF-01，工业硫酸不适宜单独作为此矿样浮选时磷矿物的抑制剂，而采用工业磷酸作为抑制剂和矿浆pH值调整剂，在磷酸用量9 kg/t、捕收剂WF-01用量0.8 kg/t、浮选时间9 min、磨矿细度82%为-74 mm、矿浆浓度35%的浮选条件下，可获得较好的浮选和稀土富集效果，磷精矿的P2O5品位可从原矿的21.71%增加到32%以上，回收率达到90%；在浮选过程中稀土主要富集在磷精矿中，富集比为1.56，在精矿中的含量为87.09%.

关键词: 磷矿, 稀土, 浮选