新阳煤矿高钙煤矸石热活化特性研究

Study on Thermal Activation Characteristics of High Calcium Coal Gangue from Xinyang Coal Mine

采用热重分析法、电导率法、pH值法及ICP-AES离子浓度检测对新阳煤矿高氧化钙含量煤矸石热分解过程及不同温度热激发后煤矸石的活化特征进行了系统的分析研究。结果表明:活化过程中煤矸石物相变化经历了4个阶段:即吸附水挥发阶段、失重稳定阶段、有机碳质等挥发阶段和煤矸石结构水挥发、矿物分解阶段;随活化温度的升高,电导率值、活性离子浓度均呈下降的趋势,而溶液pH呈相反的变化规律;溶液pH测试实验表明:高氧化钙煤矸石在蒸馏水中溶解时形成一种高pH、强碱强极性溶解环境。

Thermal decomposition process and activation characteristics after different temperature thermal excitation of high calcium coal gangue, from Xinyang Coal Mine, are studied by the methods of thermal gravimetric analysis, conductivity and pH test,ICP-AES ion concentration detection experiment. The results indicate that the phase change of coal gangue shows four stages：volatilization of absorbed water, weightlessness stability, volatilization of structural water and organic carbon, mineral decomposition. And with the rise of activated temperature, conductivity, activated ion concentration will decrease in distilled water, and a high pH dissolution solution is formed; solution pH test shows that there will form a high pH, and strong polarity and alkali environment when high calcium coal gangue is dissolved in the distill water.