在磷酸盐精矿中,MgO的含量>0.4—0.5％时,会给湿法磷酸生产带来问题,要求其含量约为0.1％或更低些。但脱除矿石中的MgO,特别是脱除沉积磷酸盐矿石中的白云石,确在加工工艺中极为困难。浮选工艺虽已成功地应用于含碳酸盐的低品位磷矿, In phosphate concentrates, MgO> 0.4-0.5% poses problems for wet-process phosphoric acid production at levels of about 0.1% or less. However, the removal of MgO in ores, especially the removal of dolomite from sedimentary phosphate ores, is indeed extremely difficult in the processing. Although the flotation process has been successfully applied to carbonate-containing low-grade phosphate rock,