用质量系数评定煤矸石的辅助胶凝性能的研究

Study on Appraising Accessorial Cementitious Properties of Coal Gangue by Mass Coefficient

对原状煤矸石进行了XRD定性分析,结果表明煤矸石的矿物组成以高岭土类粘土矿物和石英为主,含有少量的长石、方解石、菱铁矿、白云石等矿物。引入质量系数法评定原状煤矸石经热活化后辅助胶凝性能的大小。原状煤矸石的质量系数与该煤矸石经热活化后辅助胶凝性能有一定的相关性,质量系数越大,表明该煤矸石经热活化后辅助胶凝性能就越好。原状煤矸石与热活化煤矸石细粉的SEM照片表明原状煤矸石结构比较致密,热活化后煤矸石结构呈疏松状态,结构中已出现部分熔融状态,一些熔融物填充了煅烧过程中成分挥发后留下的空隙。

XRD patterns of coal gangue were analysed, the results indicate that the mineral compositions of coal gangue mainly are kaolinite and quartz, others are feldspar, calcite, siderite, dolomite, and so on. The mass coefficient was brought forward to assess the activity factor of original coal gangue. The higher the mass coefficient is, the better the accessorial cementitious property is. The SEM of original and thermal activated coal gangue powder indicated the structure of origainal coal gangue was compact, but the structure of thermal activated coal gangue was loose, and some fusible mineral were filled in the interspace left by volatile.