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根据扩展的DLVO(derjaguin-landau-verwey-overbeek)理论,计算了两种水质硬度条件下煤和蒙脱石颗粒之间的相互作用势能,分析了硬度对颗粒分散行为的影响,并在沉降试验的基础上分析了颗粒之间的凝聚模式.结果表明:当水质硬度由1.0 mmol/L增至10.0 mmol/L时,煤颗粒之间总作用势能由正变负,颗粒之间发生凝聚;蒙脱石颗粒之间以及蒙脱石和煤颗粒之间总作用势能,在此硬度范围内始终为正值,因此,颗粒之间不凝聚而始终处于分散态.凝聚沉降试验证实了随着硬度提高,煤颗粒之间由分散态转化为凝聚态,凝聚颗粒离散沉降;蒙脱石颗粒之间在此硬度范围内形成网架结构整体压缩沉降;当水中同时含蒙脱石和煤颗粒时,煤颗粒被包裹在网架结构中呈整体压缩沉降.
According to the extended DLVO (derjaguin-landau-verwey-overbeek) theory, the interaction potential energy between coal and montmorillonite particles under two kinds of water hardness conditions is calculated, and the effect of hardness on particle dispersion behavior is analyzed. The results show that when the water hardness increases from 1.0 mmol / L to 10.0 mmol / L, the total potential energy of coal particles changes from positive to negative, and the agglomeration of particles occurs. The total potential energy between the montmorillonite and the coal particles is always positive within the range of the hardness, so the particles are not aggregated and remain in the dispersed state all the time. The coagulation settlement test confirms that as the hardness increases, The coal particles are transformed from dispersed state to condensed state, and the agglomerated particles are dispersed and settled. The montmorillonite particles form a complete compression and settlement of the grid structure within the hardness range. When the water contains both montmorillonite and coal particles, Package in the grid structure was the overall compression and settlement.