关键词: 煤矸石, 矿物特性, 组成, 六盘水地区

Abstract: The mineral characteristics of coal gangue from Liupanshui area in Guizhou Province were studied. The results showed that the mixed gangue samples of waste coal roadway gangue and rock gangue had low C content and low calorific value, which could not be used directly as power generation fuel. However, Al enrichment and high contents of Fe and Ca were one of the important characteristics of coal gangue. The chemical components in the coal gangue mainly included SiO2, Al2O3 and Fe2O3, and their total content was up to 70%~80%. Moreover, V, Co, Ni, Cr and Ge had high enrichment degree in the coal gangue, which should be recovered as important value metals. In addition, its mineral composition mainly consisted of quartz and kaolinite, and then siderite, pyrite, montmorillonite, plagioclase, illite, dolomite, calcite and anatase, etc. The coal gangue powder was made up of the particles with irregular shapes and different sizes in the main range 1~3 mm, and partially 0.2~1 mm. The crystalline minerals, such as quartz, siderite and pyrite, were mostly in dense block and had perfect crystalline structure, while kaolinite, montmorillonite and plagioclase, etc., were in flake or loose block, which had lower crystalline degree than quartz, the organic matter containing C was mainly in flake and amorphous structure.

Key words: coal gangue, mineral characteristics, composition, Liupanshui area