【摘要】 针对转底炉处理红土镍矿生产镍珠铁的可行性进行研究。通过控制温度和炉渣高温特性,使炉渣形成半熔融状态,还原后的金属产生聚集和长大,形成含镍铁珠。讨论还原温度、炉渣成分、耐火材料、还原剂配比、球团直径及还原剂种类对生产镍珠铁的影响。研究结果表明:当还原温度为1 400℃,还原时间为30 min,SiO2-MgO-CaO三元渣系中CaO的质量分数为15%,球团直径为30 mm时,采用石墨坩埚,可以得到Ni质量分数为11.53%,Fe质量分数为84.16%的镍珠铁,此时,Ni的回收率可以达到98.59%,Fe的回收率为73.27%。更多还原

【Abstract】 A novel process was proposed to directly produce ferronickel alloy nugget from nickel laterite by rotary hearth furnace(RHF). By controlling the temperature and slag property, the metal after reduction would separate from the molten slag and agglomerate as ferronickel nugget. In this work, the influences of some factors, such as the temperature, the slag composition, the refractory, the reductants and their dosage, the pellets size, were investigated. The results show that when the temperature is 1 400 ℃, the mass fraction of CaO in SiO2-MgO-CaO ternary system is 15%. When the diameter of pellet is 30 mm, the ferronickel can be achieved successfully by using graphite crucible within 30 min. The nickel content reaches 11.53% and its recovery ratio is 98.59%, while the grade and recovery ratio of Fe is 84.16% and 73.27%, respectively.更多还原