浮选柱反浮选脱镁工艺研究

Reverse Flotation Process for Magnesium Removal Using Flotation Column

利用浮选柱对高硅镁中低品位胶磷矿(P2O525.74%、MgO 1.31%、SiO213.79%)进行反浮选脱镁实验,优化了反浮选脱镁工艺,并比较了浮选柱和浮选机的反浮选脱镁效果。确定最佳脱镁工艺条件为:捕收剂用量1.2 kg·t^-1、磷酸用量7 kg·t^-1、充气流量600 L·h^-1、冲洗水流量6 L·h^-1、柱径比8,在此条件下,得到P2O5品位为27.36%、MgO含量为0.64%的精矿,且精矿产率为92.65%,P2O5回收率为98.71%。

We carried out the reverse flotation experiments for magnesium removal on middle and low grade phosphate rock with high silica magnesia(P2O525.74%,MgO 1.31%,and SiO213.79%)using flotation column,and optimized the reverse flotation process for magnesium removal.Moreover,we compared the reverse flotation effects of flotation column and flotation machine.The optimal conditions for magnesium removal can be determined as follows:the collector dosage of 1.2 kg·t^-1,the phosphoric acid dosage of 7 kg·t^-1,the aeration flow rate of 600 L·h^-1,the washing water flow rate of 6 L·h^-1,and the column diameter ratio of 8.Under above conditions,the concentrate with P2O5 grade of 27.36%and MgO content of 0.64%can be obtained,meanwhile,the yield of concentrate is 92.65%,and the recovery rate of P2O5 is 98.71%.