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大峪口白云质磷块岩含P_2O_57.70％,MgO 4.4％及酸不溶物30.9％,矿物嵌布细,属难选矿石。扩大试验采用正反浮选,磨矿细度-200目90％时,可获得含P_2O_5 34.2％、MgO 0.7％的精矿,回收率85.0％。正浮选在碱性介质中进行,粗选作业可排除26.6％MgO,精选作业排除47.6％MgO,正浮选作业回收率88.9％。反浮选在酸性介质中进行,可有效浮起受有机碳污染的细粒白云石,作业回收率95.6％,19.3％MgO在本作业进一步排出。 与直接浮选相比,正反浮选流程的精矿不但MgO含量大大降低,其脱水性能也改善了,沉降速度为6.5mm/s,过滤机生产能力为16.6t/m~2·d,比直接浮选分别提高2倍和1.4倍。
Dayukou white dolomite block contains P_2O_57.70%, MgO 4.4% and acid insoluble matter 30.9%, fine mineral embedded, is refractory ore. In the enlarged test, both positive and negative flotation were used. When the fineness of grinding-200 mesh was 90%, the concentrate with 34.2% of P2O5 and 0.7% of MgO was obtained with the recovery of 85.0%. Positive flotation is carried out in alkaline medium, 26.6% MgO can be excluded from roughing operations, 47.6% MgO is excluded from intensive operations and 88.9% from positive flotation operations. Anti-flotation in acidic medium, can effectively float fine organic dolomite dolomite recovery of 95.6%, 19.3% MgO further discharge in this operation. Compared with the direct flotation, the concentrate of the forward and reverse flotation processes not only greatly reduces the content of MgO, but also improves the dehydration performance. The settling velocity is 6.5 mm / s, the filter productivity is 16.6 t / m ~ 2 · d, Than the direct flotation increased by 2 times and 1.4 times.