黏土矿物对煤泥表面性质的影响

Effects of Clay Minerals on the Surface Properties of Coal Slime

针对黏土含量较高的难处理煤泥水,以深度脱灰后的浮选精煤为研究对象,采用扫描电子显微镜、Zeta电位仪研究了3种常见黏土矿物高岭石、蒙脱石和伊利石对煤泥表面性质的影响。电子显微镜扫描结果表明:高岭石和伊利石在煤泥水中分散性差,存在较多大颗粒,有利于煤泥水沉降,而蒙脱石软化崩解后粒度更细,更易均匀分散,不利于煤泥水沉降。Zeta电位测定结果显示:高岭石和伊利石对煤表面的电负性影响较小,而蒙脱石增加了混合煤样的电负性,使煤泥颗粒更易稳定悬浮,不利于煤泥水沉降。从混合煤样的表面形貌和电位测定结果可得出,蒙脱石是影响煤泥水沉降效果的主要黏土矿物。

In order to investigate the reason why the coal slime water with high clay minerals content was difficult to treat, taking depth de -ashing flotation clean coal as the research object, the influence of kaolinite, montmorillonite and illite on the surface properties of the coal slime was analyzed through Scanning Electron Microscope and Zeta potential instrument.The Scanning Electron Microscope results showed that kaolinite and illite in slurry had many coarse particles with bad distribution which was against to the sedimentation, while montmoril- lonite was easy to disperse more evenly after softening and degradation.Zeta potential results showed that in comparison with kaolinite and illite,the coal sample added montmorillonite improves the Zeta potential value which lead to stable suspension of coal slime particles a- gainst the sedimentation.The results of the surface morphology and Zeta potential showed that montmorillonite was the most important clay minerals which deteriorated slurry settlement.