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金川公司废弃的铜选矿尾渣和镍熔融渣含铁30%~40%,FeO+SiO2含量大于90%。根据弃渣的成分特点,提出了一种综合处理铜选矿尾渣和镍熔融渣的提铁炼钢工艺:将铜选矿尾渣和碳质还原剂进行造块,在矿热炉中熔化还原,冶炼低牌号硅铁,再将热态的含硅铁水与热态的镍熔融渣兑入摇炉,并加石灰控制碱度,冶炼出还原铁水。经过理论分析计算,利用31.2 kg焦炭在矿热炉中熔化还原100 kg铜选矿尾渣,可以冶炼出57.3 kg的含硅28%的硅铁合金。用硅铁还原镍熔融渣,冶炼1 t还原铁水需要镍熔融渣1470 kg,铜选矿尾渣1060 kg,干焦炭298 kg,石灰911 kg。充分利用热态的含硅铁水和镍熔融渣两种热能,用石灰的烘烤温度调节控制摇炉内温度,避免突然爆发的大喷溅,预期可以实现回收渣中绝大部分有价金属的目的。并将产生的炉渣用于制作无机非金属建筑材料,实现弃渣的综合利用。理论分析表明该工艺利用两种弃渣进行提铁是可行的。
Jinchuan abandoned copper processing tailings and nickel slag molten iron content of 30% to 40%, FeO + SiO2 content of more than 90%. According to the characteristics of slag composition, a process of iron extraction and steelmaking for comprehensive treatment of copper dressing tailings and nickel molten slag is proposed: making copper ore dressing tailings and carbonaceous reducing agents for making blocks, melting and reducing in the ore furnace, Smelting low-grade ferrosilicon, and then the hot silicon-containing molten iron and molten nickel molten into the shaker, and add lime control alkalinity, smelting a reduction of molten iron. After theoretical analysis and calculation, using 31.2 kg of coke in a submerged arc furnace, 100 kg of copper dressing tailings can be melted and reduced to produce 57.3 kg of ferrosilicon alloy containing 28% silicon. Reduction of molten iron slag with ferrosilicon, smelting 1t reduction of molten iron requires 1470 kg of nickel molten slag, copper tailings 1060 kg, 298 kg of dry coke, lime 911 kg. Full use of hot silicon-containing molten iron and molten nickel slag two kinds of heat, with lime baking temperature control of the furnace temperature control, to avoid the sudden burst of large splash is expected to achieve the recovery of most of the valuable metal slag purpose. And the resulting slag is used to make inorganic non-metallic building materials to achieve the comprehensive utilization of spoil. Theoretical analysis shows that the process of using two kinds of slag to raise iron is feasible.