从黏土行为视角认识煤泥水沉降性能

Exploration of coal slurry sedimentation characteristics from the perspective of clay behavior

黏土颗粒在煤泥水中是不稳定的,其颗粒粒度分布、表面水化膜厚度、电动电位分布等参数都会随浸泡时间增加而变化,从而导致黏土颗粒之间相互作用形式发生变化,黏土颗粒与煤颗粒之间相互作用也随之改变,最终表现为煤泥水沉降性能的变化和差异。文章以煤泥水中有代表性的黏土矿物—高岭石和蒙脱石为研究对象,分析了煤中黏土矿物在水中性质和行为的变化特征,从黏土行为视角总结了国内外对煤泥水沉降性能的认识和研究历程,并展望了煤泥水处理技术的发展趋势。

Clay particles in coal slurry water are unstable in nature and the parameters like size distribution,thickness of surface hydrated film and electric kinetic and Zeta potentials all tend to change with increase of soaking time,which can result in the change of the pattern of interaction between clay particles and the according change of interaction between coal and clay particles.The changes may lead finally to the variation of characteristics of sedimentation of coal slurry.A study is made in the paper with the representative clay minerals present in coal slurry water,kaolinite and montmorillonite,as the objects,with an aim to analyze the properties and change of behaviors of the clay minerals in water.Following an overview of the progress of the research work so far made both within and abroad on sedimentation characteristics based on clay behaviors,the paper looks ahead to the developing trend of such technologies for coal slurry water treatment.