红土镍矿转底炉预还原-电炉熔分制取镍铁合金

范兴祥，董海刚，汪云华，吴跃东，李柏榆，李博捷，赵家春，暂林寒

(昆明贵金属研究所 稀贵金属综合利用新技术国家重点实验室，云南 昆明，650106)

摘 要：对某红土镍矿采用转底炉预还原-电炉熔分工艺制取镍铁合金进行研究。实验结果表明：根据矿石性 质，选择合适的渣型为SiO₂-MgO-CaO-FeO四元渣系，在熔剂石灰配比为25%，还原剂配比为3.5%，预还原温度为1 150 ℃，预还原时间为30 min，电炉熔分温度为1 450 ℃，熔分时间为15 min的条件下，经转底炉预还 原-电炉熔分后，获得镍质量分数为8.68%、镍回收率97.62%、铁质量分数为86.23%的镍铁合金，该合金可用作不锈钢生产原料。

关键词：红土镍矿；预还原；电炉熔分；镍铁合金

Production of Ni-Fe alloy from nickeliferous laterite ore by prereduction-electric furnace smelting separation

FAN Xing-xiang, DONG Hai-gang, WANG Yun-hua, WU Yue-dong, Li Bai-yu, LI Bo-jie, ZHAO Jia-chun, ZAN Lin-han

(Kunming Institute of Precious Metals, State Key Laboratory of Advanced Technologies for
Comprehensive Utilization of Platinum Metals, Kunming 650106, China)

Abstract:The production of Ni-Fe alloy from nickeliferous laterite ore was studied by rotary hearth furnace prereduction-electric furnace smelting separation. The results show that a SiO₂-MgO-CaO-FeO slag style is chosen according to the characteristic of the nickeliferous laterite ore and Ni-Fe alloy with 8.68% Ni (mass fraction), Ni 97.62% recovery and 86.23% Fe is obtained under the conditions of lime dosage 25%, reductant coke powder dosage 3.5%, prereduction temperature 1 150 ℃, prereduction time 30 min, smelting temperature 1 450 ℃, smelting time 15 min, respectively, which can be used as the raw material of production of stainless steel.

Key words:nickeliferous laterite ore; pre-reduction; electric furnace smelting separation; Ni-Fe alloy