Improvement of carbothermic reduction of nickel slag by addition of CaCO3

添加碳酸钙促进镍渣碳热还原（英文）

The effect of CaCO3 addition on the carbothermic reduction of nickel slag was studied,and the mechanism of CaCO3 in improving the reduction was analyzed.The results showed that when the CaCO3 content added to the slag was increased from 0 to 8 wt.%,initiation temperature of the carbothermic reaction decreased from 1100 to 1000℃,the temperature reaching the maximum reduction rate decreased from 1150 to 1100℃,and the reduction degree of the nickel slag increased from 58%to 88%.The iron particles in the reduced nickel slag were coarsened and the X-ray diffraction intensity of metallic iron peaks increased,confirming that the addition of CaCO3 was beneficial to the reduction of nickel slag and recovery of iron.

研究添加碳酸钙对镍渣碳热还原过程的影响,并分析其机理。结果表明,随着原料中碳酸钙添加量从0增加到8%(质量分数),还原反应初始温度和达到最大反应速率所需的温度分别从1100和1150℃降低到1000和1100℃,镍渣的还原率从58%增加到88%;还原后的渣中铁粒发生粗化,金属铁的衍射峰强度增加,表明添加碳酸钙有利于促进镍渣中铁化合物的还原回收。