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为了探究含碳球团还原熔分机理,将分析纯的Fe_2O_3、氧化物和不同还原剂固结成球并进行等温还原实验,研究了温度、还原时间、配碳量、还原剂种类等条件对球团还原熔分行为的影响.进一步采用X射线衍射、扫描电子显微镜等手段表征了含碳球团在不同还原时间的微观结构及物相变化.实验结果表明:焙烧温度过低或过高含碳球团都不能良好熔分,配碳量增加可以提高球团还原和熔分速率,适宜的温度、碳氧摩尔比、还原剂分别是1400℃、1.2和煤粉.含碳球团还原熔分包括直接还原反应、间接还原反应、碳的气化反应、渗碳反应和铁的熔化反应,最后实现渣铁分离.
In order to investigate the mechanism of reduction and fusion of carbon-containing pellets, the analytically pure Fe 2 O 3, oxides and different reducing agents were solidified into balls and subjected to isothermal reduction experiments. The effects of temperature, reduction time, carbon content and reducing agent on Pellet reduction melting behavior.The microstructure and phase transformation of carbon-containing pellets at different reduction time were further characterized by X-ray diffraction and scanning electron microscopy.The experimental results show that the calcination temperature is too low or too high Carbon pellets are not good melting points, with the increase of carbon content can improve pellet reduction and melting rate, the appropriate temperature, molar ratio of carbon and oxygen, respectively, reducing agent 1400 ℃, 1.2 and pulverized coal. Sub-including direct reduction reaction, indirect reduction reaction, carbon gasification reaction, carburizing reaction and iron melting reaction, and finally slag iron separation.