Study of the Hydrophobic Interaction on the Flotation Separation of Fine Oxide Minerals

吸附在捕收剂上的颗粒之间存在疏水相互作用，似乎干扰了选择性浮选。本研究以乙酸十二烷基铵为捕收剂，对粗粒石英（149 ~ 210<micrn>m）和细粒赤铁矿（-10<micrn>m）的浮选分离进行疏水相互作用研究。所得结果总结如下：1)单个浮选试验表明，石英在DAA的表面覆盖率约为6%时可实现完全浮选，赤铁矿的完全浮选则需要高达70%的表面覆盖率。2)尽管石英获得了足够的DAA表面覆盖度，但在赤铁矿细粒存在的情况下，石英的可浮性明显下降，这可能是由于赤铁矿细粒在石英表面包裹了一层泥，其中石英与赤铁矿之间的疏水相互作用起了重要作用。

There exists the hydrophobic interaction between the particles adsorbed the collector, which is seemed to interfere the selective flotation. In this study the hydrophobic interaction was examined in terms of the flotation separation of coarse grained quartz (149-210<micrn>m) and fine hematite(-10<micrn>m) using dodecyl ammonium acetate as a collector. The results obtained are summarized as follows.1) Individual flotation tests showed that complete flotation of quartz is achieved at a surface coverage of DAA of about 6%, while the complete flotation of hematite requires as much as 70% of surface coverage.2) Floatability of quartz decreased markedly in the presence of hematite fines in spite of the fact that quartz acquires a sufficient amount of surface coverage of DAA,which is considered to be due to the slime coating of quartz surfaces with hematite fines, where the hydrophobic interaction between quartz and hematite plays an important roles.