硅热法炼镁预制球团成球过程的研究

为改变硅热法炼镁工艺存在资源利用率低、能耗高等缺陷,提出了造球→煅烧→还原硅热法炼镁新工艺.为了控制炼镁预制球团生球的成长,主要研究了白云石球团生球的成长特性,考察了影响球团成形的影响因素.结果表明:间断造球过程中,生球的长大主要以聚结机理进行,连续造球过程中,生球的长大主要以成层机理进行;白云石预制球团生球的成长率随原料含水量的增加而增加;随着高岭土用量的增加,生球成长率上升;原料进行湿混或干混,对生球的成长行为产生不同影响,随着水分含量的增加,其生球成长速度也相应增加.

Experimental Study on Pelletizing Process of Prepared Pellets for Silicothermic Magnesium Production

The magnesium preparation process of silicothermic reduction exists the problems of high energy consumption and high cost. Focusing on these disadvantages， a new technology of pellet preparation→calcination→reduction was proposed. In order to control the growth of prepared pellets for silicothermic reduction process， the pelletizing growth characteristics of dolomite pellet and the influence factors on the forming process of pellets are studied. The results indicate that the growth of the pellets mainly follows the coalescence mechanism in the discontinuous pelletizing process. The growth of the pellets mainly follows the stratification mechanism in the continuous pelletizing process. The growth rate of the prepared dolomite pellets increases with the increase of the moisture content in raw materials. With the increasing of kaolin addition， the growth rate of pellet increases. In addition， grinding method has an effect on the growth behavior of pellets. With the increase of moisture content， the growth rate of pellets also increases accordingly.