粒度大小和颗粒间相互作用对白钨矿浮选的影响

摘要

Effects of size distribution (particle size and content of fine fraction (<10μm)) on scheelite flotation were studied using flotation tests and theoretical calculations. The results show that particle size influences the scheelite recovery and the performance of combined reagents. The scheelite recovery is lowered by adding fine particles (<10μm) into the pulp containing coarse particles. Extended DLVO (EDLVO) theory confirms that the fine fractions (<10μm) could interface with the coarse fractions. The interaction energy and fluid forces are relative to the particle size, which might explain why the fine fractions influence the scheelite flotation. The highest recovery of scheelite using combined reagents as collector and optimum ratio of combined reagents were determined by scheelite particle size and reagent performance. However, the optimum adding order was only determined by reagent performance, which has nothing to do with particle size.%通过浮选试验和理论计算研究白钨矿粒度分布(粒径小于10μm的微细粒含量)对浮选的影响。结果表明，颗粒粒径对白钨矿浮选回收率以及组合药剂性能都有影响；扩展的DLVO(EDLVO)理论证明白钨矿颗粒之间存在相互吸引力。颗粒之间的相互作用能、流体剪切力大小都与颗粒粒径有关，这是小于10μm粒级白钨矿对粗粒级白钨矿回收率的影响随着粗粒级粒度的改变而发生变化的主要原因。以组合药剂为捕收剂时，白钨矿的最高回收率和组合药剂的最佳配比与颗粒粒度以及药剂性能有关，而组合药剂的最佳添加顺序与颗粒粒度无关，只与药剂性能有关。