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

吸附捕收剂的颗粒之间存在疏水相互作用，这可能会干扰优先浮选。本文研究了以十二烷基乙酸铵为捕收剂浮选分离粗粒石英（149-210 <micrn>m）和细粒赤铁矿（~ 10 <micrn>m）时的疏水作用。结果表明：1）单矿物浮选试验表明，石英的完全浮选需要6%的DAA表面覆盖率，而赤铁矿的完全浮选需要70%的DAA表面覆盖率; 2）尽管石英获得了足够的DAA表面覆盖率，但在赤铁矿粉存在下，石英的可浮性显著降低，这被认为是由于石英表面被赤铁矿细粉覆盖，其中石英和赤铁矿之间的疏水相互作用起重要作用。

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.