高品位磷矿石储量的枯竭 ,促进了适于经济处理储量巨大的低品位磷矿石的选矿方法的研究。世界 75-80 %低品位磷矿石含有碳酸盐脉石 ,用一般的简单工艺不能处理它。选别沉积型的含有大量方解石和白云石的磷块岩矿石存在一些难题 ,如碳酸盐矿物与磷酸盐矿物具有相近的表面性质。两段阴离子碳酸盐矿物 (方解石和白云石 )反浮选可从沉积型磷块岩矿石中除去碳酸盐矿物。在脂肪酸阴离子反浮选中 ,用正磷酸作为磷酸盐矿物的抑制剂处理几个不同产地的沉积型含方解石和白云石的磷矿石获得了满意的结果。 The depletion of high-grade phosphate rock reserves has promoted the study of a beneficiation process for low-grade phosphate rock, which is well suited for economically processed reserves. 75-80% of the world’s low-grade phosphate rock contains carbonate gangue, which can not be handled by simple processes in general. Separation of sedimentary phosphate rock containing large amounts of calcite and dolomite ore has some problems, such as carbonate minerals and phosphate minerals have similar surface properties. Two-stage anti-flotation of anionic carbonate minerals (calcite and dolomite) removes carbonate minerals from sedimentary phosphate rock. In fatty acid anion reverse flotation, satisfactory results have been obtained with orthophosphoric acid as an inhibitor of phosphate minerals in the treatment of several sedimentary calcite- and dolomite-bearing phosphate rock from different origins.