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测定了蒙脱石、高岭石和煤颗粒的表面接触角和ζ电位,根据扩展的Derjaguin-Landau-Verwey-Overbeek(DLVO)理论,计算了含两种黏土煤泥水中颗粒间的相互作用势能,并分析了颗粒分散行为.在沉降试验基础上讨论了颗粒之间的沉降模式.结果表明:试验中高岭石颗粒之间总作用势能为正,煤颗粒之间及其与高岭石颗粒之间总作用势能均为负,含高岭石的煤泥水上清液中仅含少量剩余分散的高岭石颗粒,其余凝聚后沉降.含蒙脱石的煤泥水中,蒙脱石颗粒之间及其与煤颗粒之间总作用势能均为正,蒙脱石颗粒形成网架结构,煤颗粒被“包裹”其中,所以呈整体沉降.
The surface contact angle and zeta potential of montmorillonite, kaolinite and coal particles were measured. Based on the extended Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, the interaction potential energy between particles in two kinds of clay slime water was calculated. And the dispersion behavior of the particles was analyzed.The sedimentation pattern between the particles was discussed on the basis of the sedimentation test.The results showed that the total potential energy of the kaolinite particles was positive during the experiment and that between the coal particles and the kaolinite particles The total potential energy is negative, only a small amount of kaolinite in the supernatant of the slurry containing dispersed kaolinite particles, the rest of the settlement after the aggregation of montmorillonite-containing slime water, montmorillonite particles and The total potential energy between them and the coal particles are positive, montmorillonite particles form a grid structure, coal particles are “package ” among them, so the overall settlement.