粗粒辉钼矿工艺矿物学及流态化浮选抛废研究

Process mineralogy and fluidized-bed flotation pre-discarding study on coarse molybdenum ore

粗粒预选抛废是实现选厂节能降耗的重要技术手段,借助流态化浮选技术对河南某选厂低品位辉钼矿(粒级-1 mm,Mo品位0.076%)进行选前抛废探索。通过工艺矿物学对辉钼矿嵌布和解离特征进行了全面分析,研究了操作因素对流态化浮选的影响规律,并在不同捕收剂用量下比较了其与机械式浮选的抛废效果差异。工艺矿物学结果表明,试验所用矿石中主要有价矿物辉钼矿为中粒-细粒不均匀嵌布,粗粒级矿石中辉钼矿解离度较低。流态化浮选结果表明,操作因素对于尾矿品位和抛尾率均可能产生影响,最优条件下流态化浮选尾矿品位为0.011%~0.015%,抛尾率为40%~55%,抛废效果远优于机械式浮选,其原因是流态化浮选构建了低紊流环境,提升了浮选粒度上限。

The coarse waste pre-discarding is the important technique to achieve energy saving for the mineral processing plant.The waste pre-discarding of a low-grade molybdenite ore(−1 mm,Mo grade 0.076%)from a plant in Henan Province was explored by utilizing fluidized-bed flotation technique.The association and liberation characteristics of molybdenite were comprehensively analyzed by process mineralogy,and the influence of operating parameters on fluidized-bed flotation was studied.The pre-discarding effect of the fluidized-bed flotation was compared with the mechanical flotation cell under different collector dosages.The results of process mineralogy show that molybdenite,the main valuable mineral in the ore,is distributed unevenly in medium to fine grain sizes,and the molybdenite liberation in coarse size grade is low.The fluidized-bed flotation results show that the operating parameters may have an impact both on tailing grade and tailing yield.Under the optimal conditions,the tailing grade of fluidized bed flotation is 0.011%−0.015%,and the tailing yield is 40%−55%.The pre-discarding effect is far better than that of mechanical flotation cell,because the fluidized-bed flotation builds a low turbulence environment and raises the upper limit of floatable particle size.