Effects of nonpolar oil on hydrophobic flocculation of hematite and rhodochrosite fines
Effects of nonpolar oil on hydrophobic flocculation of hematite and rhodochrosite fines
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DOI：
10.1016/s0032-5910(98)00150-8
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发表时间：
1999-01-04
影响因子：
5.2
通讯作者：
Ding, YQ
中科院分区：
文献类型：
--
作者：
Song, SX;Lopez-Valdivieso, A;Ding, YQ
结果表明，少量煤油的加入大大增强了赤铁矿和菱锰矿的疏水絮凝作用，使其对油酸根离子的吸附变得疏水。这种影响不仅与煤油浓度密切相关，而且与矿物颗粒的疏水性密切相关。利用倾斜板技术测定了矿物颗粒的疏水附着力，结果表明，加入煤油后，矿物颗粒的疏水附着力是不加煤油时的280倍，且该力是颗粒接触角的指数函数。絮凝动力学研究和疏水粘附力测量表明，煤油对疏水絮凝的积极作用主要是由于絮体强度的增加，从而使絮体能够支持湍流产生的更大的絮体破碎力场。(C)1999 Elsevier Science S.A.保留所有权利。
It is shown that a small amount of kerosene addition greatly enhances the hydrophobic flocculation of hematite and rhodochrosite fines rendered hydrophobic by the adsorption of oleate ions. This effect is not only closely related to kerosene concentration, but also to the hydrophobicity of mineral particles. Using the tilting plate technique, the hydrophobic adhesion force of the mineral particles was determined, indicating that kerosene addition increases the force by about 280-fold as compared to that without kerosene, and that this force is an exponential function of the particle contact angle. Flocculation kinetics studies, along with hydrophobic adhesion force measurements, reveal that the positive effect of kerosene on hydrophobic flocculation is mainly due to an increase in the strength of flocs, and thus the flocs can support greater floc-rupture force field from turbulent flows. (C) 1999 Elsevier Science S.A. All rights reserved.