以红土镍矿为主要原料,通过熔融还原制备镍铁颗粒,研究了熔分温度、还原时间、配碳量等因素对还原熔分过程的影响.结果表明,最佳熔融还原实验条件为:熔分温度1450℃,恒温时间60 min,C/O比1.4,生石灰配加量10％,此时得到镍铁颗粒铁含量87.01％,镍含量7.82％.经高温熔化和还原反应后,铁镍合金在渣相中不断聚集长大,最后完成富集;残渣主要以钙和镁的硅酸盐化合物形式存在.熔分出的镍、铁主要以镍铁合金形式存在,并含有一定量的FeC和FeNiCS固溶体.%The ferro-nickel granules were prepared by smelting-reduction ( SR ) process with lateritic nickel as raw material. Effects of different reduction temperature, reduction time and carbon content on the SR process were investigated. Results showed that with the following optimum conditions, including a smelting temperature of 1450 ℃ that was kept constant for 60 min, and C/O at the molar ratio of 1.4, addition of quicklime at an amount of 10％, the resulted nickel iron particles contain 87.01％ Fe and 7.82％ Ni respectively. After a high-temperature SR process, the ferronickel gradually grew in the slag phase and was finally concentrated. The residue predominantly consists of silicate compounds of calcium and magnesium, while the nickel and iron after SR process principally exists in the form of ferronickel, containing a certain amount of solid solution of FeC and FeNiCS.
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