泥化抑制对煤矸石-水体系沉降性能影响分析  

Investigating Settling Properties of Coal Gangue-Water Suspensions on Controlled Dispersion of Swelling Clays

作　　者：陈翌昱 张明青[1] 于伟 杨畅[1] 马泽坤 CHEN Yi-yu1, ZHANG Ming-qing1, YU Wei1, YANG Chang1, MA Ze-kun2(1. School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China; 2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Chin)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116 [2]中国矿业大学化工学院,江苏徐州221116

出　　处：《煤炭技术》2018年第6期297-300,共4页Coal Technology

基　　金：国家自然科学基金资助项目(51004108)

摘　　要：以钙离子为泥化抑制剂,以含膨胀型黏土的煤矸石-水分散体系为对象,对比研究了抑制和非抑制2种情况下其沉降性能的变化。结果表明:添加相同量CaCl_2·2H_2O,抑制体系澄清界面先快速下降而后逐渐稳定;非抑制体系中澄清界面下降缓慢,其沉降性能较抑制体系显著恶化。流变学特性分析表明:抑制条件下体系悬浮部分为牛顿流体,冷冻扫描电镜(Cryo-SEM)显示黏土单元晶层保持紧密的面-面结合形成独立的颗粒物,离散悬浮于体系中;非抑制条件下体系悬浮部分为塑性流体,剪切速率100 s^(-1)时黏度为47.9 mPa·s,远高于抑制体系黏度14.5 mPa·s。其中黏土单元晶层通过边-面、面-面等结合形成整体"网架"结构。Taking calcium ion as a clay inhibitor, with expansive clay gangue - water dispersion system as the object, the change of settlement performance under two conditions of inhibition and non suppression was compared. The results showed that with the same amount of CaCl2-2H2O, the inhibition system firstly decreased rapidly and then gradually stabilized;in the non inhibitory system, the interracial degradation was slow and the settlement of the system was worse than that of the inhibition system. The rheological property analysis showed that the suspension fraction was Newton fluid under the inhibition condition,the frozen scanning electron microscopy （Cryo-SEM） showed that the clay unit layer maintains compact surface-to-surface binding to form separate particles dispersed in the system; under the condition of non suppression system suspended part of plastic fluid, the shear rate was 100 s-1 the viscosity was 47.9 mPa. s,much higher than the inhibition of viscosity 14.5 mPa. s. Among them, the clay unit crystal layer formed a whole ＂grid structure＂ through the combination of the edge plane and the surface face.

关 键 词：膨胀型黏土 煤矸石 沉降性能 泥化抑制 

分 类 号：TD94[矿业工程—选矿]