Ferronickel particle formation during the carbothermic reduction of a limonitic laterite ore
Ferronickel particle formation during the carbothermic reduction of a limonitic laterite ore
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DOI：
10.1016/j.mineng.2016.10.020
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发表时间：
2017
影响因子：
4.8
通讯作者：
R. Elliott;C. Pickles;J. Peacey
中科院分区：
文献类型：
--
作者：
R. Elliott;C. Pickles;J. Peacey
从含镍红土矿石中经济地提取镍的尝试面临许多挑战，包括在加工之前对矿石进行提纯的能力有限。解决这一问题的一种方法是在中等温度下还原矿石以形成镍铁合金，然后可以选择性地回收镍铁合金以形成镍精矿。目前的工作探讨了不同的煤，元素硫和黄铁矿的添加和温度在1000-1200 °C范围内对褐铁矿中镍铁合金颗粒形成的影响。据观察，少量的硫添加（约4%）产生了显着增加还原过程中形成的镍铁颗粒的平均尺寸。在硫的存在下，还观察到由于铁的金属化增加而导致的镍铁颗粒的平均镍品位的降低。还原矿石中的镍铁颗粒形态和硫的分布与988 °C下由Fesingle键FeS共晶驱动的液相生长机制一致。
Attempts to economically extract nickel from the nickeliferous laterite ores face a number of challenges, including a limited ability to beneficiate the ore prior to processing. One method to address this issue would be to reduce the ore at moderate temperatures to form a ferronickel alloy, which could then be selectively recovered to form a nickel concentrate. The current work explores the effects of varying coal, elemental sulphur and pyrite additions and temperatures in the range of 1000–1200 °C on the formation of ferronickel alloy particles in a limonitic ore. It was observed that a small sulphur addition (⩽4%) yielded a significant increase in the average size of the ferronickel particles formed during reduction. A decrease in the average nickel grade of the ferronickel particles, resulting from the increased metallization of iron, was also observed in the presence of sulphur. The ferronickel particle morphology and distribution of sulphur in the reduced ore are consistent with a liquid-phase growth mechanism driven by the Fesingle bondFeS eutectic at 988 °C.