铝土矿浮选泡沫消泡研究

Investigation on antifoaming of flotation bauxite

以河南混合铝土矿浮选精矿泡沫为研究对象,分析铝土矿浮选泡沫的稳定原因。采用物理方法和化学方法,进行三相泡沫的消泡研究。结果表明油酸钠可以显著降低水溶液体系的表面张力,同时微细疏水矿粒在气泡表面的吸附降低了气泡表面的排液速率,并增强了气泡的机械强度,导致铝土矿浮选泡沫稳定;另外,转速对机械搅拌消泡有较大的影响,消泡效果随转速的提高而增强;磷酸三丁酯、Foamban-ms-575和BD3037对两相泡沫体系具有很好的消泡作用,但在三相泡沫体系中由于在泡沫表面铺展速率的限制,消泡效果并不明显;利用机械搅拌和添加消泡剂,可以在较低的转速下,大大改善消泡效果。

The flotation concentrates of bauxite were used to study the stability of three-phase foams. The physical method and chemical process were used to defoam the foam of flotation concentrate. The results show that the surface tension of aqueous solution can be decreased by sodium oleate. At the same time, the adsorption of fine hydrophobic particles on the surface of bubble retards film drainage, strengthens mechanical strength of bubble, leads to the stability of foams. The rotate speed shows significant influence on the antifoaming of stirring. The antifoaming effect improves with the increase of the rotate speed. In two-phase foam system, the antifoaming effect of tri-butyl-phosphate（TBP）, and Foamban-ms-575 and BD3037 is good, but they have no influence on three-phase foam, because their spreading velocity is limited. Under the conditions of low rotate speed, the antifoaming effect is improved with mechanical agitation and the defoaming agent.