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对CaF2在以白云石和菱镁石为原料的铝热还原过程中的行为进行了研究,通过X射线衍射对还原渣和结晶产物的物相进行了分析,对CaF2在铝热还原过程的反应过程以及加速还原反应的机理进行了探讨。实验研究结果表明,在还原过程中加入CaF2可降低还原反应的活化能,加快还原反应速率,可使还原过程中的氧化镁还原率提高3%以上,但添加CaF2的效果随还原温度的升高而降低。加入CaF2后一部分CaF2参与还原反应生成了11CaO.7Al2O3.CaF2,另外一部分CaF2被铝还原在结晶器上生成了一种主要成分为MgF2和Al的结晶物。CaF2对铝热还原反应的促进作用是化学反应促进和提高煅白表面活性共同作用的结果。
The behavior of CaF2 during the aluminothermic reduction process using dolomite and magnesite as raw materials was studied. The phase of reduction slag and the product of crystallization were analyzed by X-ray diffraction. The reaction process of CaF2 in aluminothermic reduction As well as the mechanism of accelerating the reduction reaction. Experimental results show that adding CaF2 during the reduction process can reduce the activation energy of the reduction reaction and accelerate the reduction reaction rate, which can increase the reduction rate of magnesium oxide by more than 3% during the reduction process. However, the effect of adding CaF2 increases with the reduction temperature Lower. After adding CaF2 part of the CaF2 involved in the reduction reaction 11CaO.7Al2O3.CaF2, the other part of the CaF2 is reduced by aluminum in the crystallizer to produce a main component of MgF2 and Al crystals. The promotion effect of CaF2 on the aluminothermic reduction reaction is the result of the combined action of chemical reaction promotion and improvement of calcined white surface activity.