Abstract Hydrophobic agglomeration of rhodochrosite fines in aqueous suspensions with sodium oleate has been investigated through wettability measurement, optical microscopy observation, laser-based particle size detection, micro-flotation test, zeta potential measurement in this work. The experimental results indicated that the hydrophobicity of rhodochrosite was a dominant factor for the hydrophobic agglomeration. And a higher sodium oleate concentration could contribute to bigger agglomeration particle size and more regular agglomerates. The increased apparent particle size of minerals through hydrophobic agglomeration interaction was conducive to the micro-flotation recovery improvement of rhodochrosite fines in spite of a simultaneous increase in the negative zeta potential of rhodochrosite, meaning that the chemical adsorption was the primary reason between sodium oleate and rhodochrosite. Furtherly, the data calculated from extended DLVO theory was also convinced that hydrophobic interaction between the particles increased much more strongly than electrostatic repulsion from the adsorption of sodium oleate.

中文翻译：

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水悬浮液中菱锰矿细粉与油酸钠的疏水团聚

摘要 本文通过润湿性测量、光学显微镜观察、激光粒度检测、微浮选试验、zeta电位测量等方法研究了油酸钠对菱锰矿细粉在水悬浮液中的疏水团聚作用。实验结果表明，菱锰矿的疏水性是疏水团聚的主导因素。并且更高的油酸钠浓度可能有助于更大的附聚颗粒尺寸和更规则的附聚物。尽管同时增加了菱锰矿的负 zeta 电位，但通过疏水团聚相互作用增加的矿物表观粒径有利于菱锰矿细粉的微浮选回收率提高，这意味着化学吸附是油酸钠和菱锰矿之间的主要原因。此外，从扩展的 DLVO 理论计算的数据也确信，颗粒之间的疏水相互作用比油酸钠吸附产生的静电排斥更强烈。