硅酸盐通报2018，Vol.37Issue(4)：1370-1376,7.
气氛对煤矸石中矿物质高温碳热还原反应的影响
Effect of Atmosphere on the Carbothermal Reduction Reaction of Mineral Matters in Coal Gangue at High Temperature
摘要
Abstract
Producing refractory material by coal gangue is one of the effective ways to realize the high-value utilization of coal gangue.The carbothermal reduction reaction of mineral matters in Pingshuo coal gangue at high temperature(1200-1500 ℃)under different atmospheres and effect of atmosphere on the mineral transformation were investigated by X-ray diffraction and scanning electron microscopy.Results show that the mullite in high-temperature coal gangue samples reacts with carbon to form moissanite (SiC)above 1300℃under argon atmosphere;while,the mullite transforms to β-Sialon(Si5AlON7)and corundum(Al2O3)above 1300 ℃ under nitrogen atmosphere.The formation of moissanite in samples could accelerate the transformation of mullite to β-Sialon when the coal gangue was firstly heated under argon atmosphere and then was heated continuously under nitrogen atmosphere.The moissanite and β-Sialon were difficult to be formed simultaneously in the coal gangue with low carbon content at high temperature.The β-Sialon in the high-temperature samples presents rod shape.关键词
煤矸石/矿物质/碳热还原反应/SiC/SialonKey words
coal gangue/mineral matter/carbothermal reduction reaction/SiC/Sialon分类
建筑与水利引用本文复制引用
田秀青,杨凤玲,马志斌,程芳琴..气氛对煤矸石中矿物质高温碳热还原反应的影响[J].硅酸盐通报,2018,37(4):1370-1376,7.基金项目
国家自然科学基金青年科学基金(21506121) （21506121）
