针对澳大利亚某红土镍矿的矿物组成及比较国内外红土镍矿处理工艺,选择还原—磨选法处理该红土镍矿.固定磨选制度,研究还原温度、还原时间、还原剂配比、添加剂配比、料层厚度等因素对镍和钴直收率及其镍和钴平均品位的影响.结果表明,合适工艺条件:原料粒度-121+96mm,还原剂配比5.0％、添加剂配比5.0％,均匀混合,制成约15 mm×15 mm×20 mm球团,烘干,还原温度1 250℃,料层厚度40 mm,还原时间30 min;还原后通保护气氛冷却到室温,粉碎,进行磨选,矿浆浓度60％,球磨时间2.0 h,采用100kA/m磁场强度磁选,磁选精矿再重选.在此工艺条件下,镍和钴的直收率分别达到88.29％和86.09％,镍钴合金粉末中镍和钴平均品位分别为9.92％和0.96％.
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