In view of the difficulty of extracting iron from Bayer red mud, a new idea of adding laterite nickel ore into red mud was proposed to prepare a high value-added product. Toward this, the influences of laterite nickel ore on thermodynamic reaction, slagging and smelting reduction of extracting iron from red mud were studied. The results indicated that the product of extracting iron from red mud (R100) was changed with the addition of laterite nickel ore (R70L30). The slag of R100 was strongly basic, while the R70L30 was weakly acidic with composition closer to the ideal blast furnace slag. The metal recovery of R100 was 75.16% and that of R70L30 was 94.05%. At the same temperature, the slag viscosity of R70L30 was significantly lower than that of R100, which proved that laterite nickel ore can adjust the basicity, reduce melting point of slag and improve metal recovery. Because Fe, Ni and Cr in red mud and laterite nickel ore can be reduced sufficiently, a low Ni–Cr alloy cast iron can be directly prepared.

鉴于从拜耳赤泥中提取铁的困难，提出了将红土镍矿添加到赤泥中以制备高附加值产品的新想法。为此，研究了红土镍矿对热力学反应，从赤泥中提炼铁的造渣和冶炼还原的影响。结果表明，通过添加红土镍矿（R70L30）改变了从赤泥中提取铁的产物（R100）。R100的炉渣为强碱性，而R70L30的炉渣为弱酸性，其成分更接近理想的高炉炉渣。R100的金属回收率为75.16％，R70L30的金属回收率为94.05％。在相同温度下，R70L30的炉渣粘度显着低于R100，说明红土镍矿可以调节碱度，降低炉渣的熔点并提高金属回收率。因为可以充分还原赤泥和红土镍矿中的Fe，Ni和Cr，所以可以直接制备低Ni-Cr合金铸铁。