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煤矸石能够通过热活化激发胶凝活性,用做水泥混合材,实现综合利用。本研究以太原西铭煤矿洗选矸石为研究对象,采用单因素实验法考察了煅烧方式、温度、时间和粒度对活化效果的影响,利用TG-DTA、XRD以及IR等分析手段探讨了不同因素对煤矸石煅烧活化的影响机制。研究结果表明,煤矸石活性主要受高岭石晶相转变和残余碳的影响。与静态煅烧相比,动态煅烧传热和氧传递效率更高,煤矸石活化效果较好。温度升高,物料活性提高,但是超过800℃后,活化效果变差。随着活化时间增加,煤矸石活性提高,超过60 min后,活性保持稳定。粒度减小,可以提高传热和氧传递效率,改善活化效果,当粒度达到10~100μm后,继续减小粒度并不能提高活化效果,因此,煤矸石动态煅烧活化粒度以保持在10~100μm为宜。
Coal gangue can activate gelation activation by heat activation, used as a cement mixture, to achieve comprehensive utilization. In this study, coal washing gangue from Ximing coal mine in Taiyuan was taken as the research object. The effects of calcination method, temperature, time and particle size on the activation efficiency were investigated by single factor experiment. The effects of calcination parameters, such as TG-DTA, XRD and IR, Influence Mechanism on Coal Gangue Calcination and Activation. The results show that the gangue activity is mainly affected by the phase transformation of kaolinite and residual carbon. Compared with static calcination, dynamic calcination heat transfer and oxygen transfer efficiency is higher, coal gangue activation better. The temperature increases, the material activity increased, but more than 800 ℃, the activation effect worsened. With the increase of activation time, the gangue activity increased, and the activity remained stable after more than 60 min. The decrease of particle size can improve the heat transfer and oxygen transfer efficiency and improve the activation effect. When the particle size reaches 10 ~ 100μm, the reduction of particle size can not improve the activation effect. Therefore, the dynamic calcination of gangue particles should be kept at 10 ~ 100μm should.