明珠号生产污水系统的微气泡旋流气浮选改造

明珠号FPSO生产污水流程不稳定,加气浮选器效率低,抗波动能力差,难以保证最终出水含油达标。对现有气浮设备进行微气泡旋流气浮选改造,制备出气泡粒径为5~10μm的溶气水。通过调试,当运行流量为110~120 m^3/h,运行压力为50~80 k Pa,溶气水注入流量为1#罐体1.3~1.8 m^3/h、2#罐体2.0~2.5 m^3/h、3#罐体2.0~2.5 m^3/h、4#罐体2.3~2.8 m^3/h,溶气水注入压力为400~500 k Pa,浮选剂投加质量浓度为30~40 mg/L,清水剂投加质量浓度为15~20 mg/L时,能够在入口油质量浓度<100 mg/L的条件下使出口油质量浓度<30 mg/L;当入口油质量浓度>100mg/L时,除油率>70%。

Effect of a cyclonic flotation column on the separation of magnesium from phosphate ore

This study was performed to investigate the effects of the cyclonic separation mechanism on the removal of magnesium from phosphate ore. An analysis of the particle-bubble collision mechanism in a cyclonic force field was used to design two different pulp circulation systems for a cyclonic-static micro-bubble flotation column （FCSMC）. Experiments comparing the two conditions were then conducted. Size analysis of the feed and separated products was conducted with a BXF cyclone size analyzer. The results show that about 34.60% of the total MgO content in the feed exists in the -10 μm fraction. This demonstrates that magnesium removal from phosphate ore has the characteristics of a micro-fine particle flotation problem. Under conditions of cyclonic circulation the MgO level of the concentrate is 1.74g, which is lower than that obtained from the column operated in direct-flow circulation by 0.34%, These results indicate that the cyclonic circulation mechanism of the FCSMC can promote removal of micro-fine particles containing magnesium. This is attributed to the function of surface flotation and to the reduction of the lower separation limit under conditions of cyclonic circulation.