Thermodynamic analysis of selective reduction of nickeliferous limonitic laterite ore by carbon monoxide
Thermodynamic analysis of selective reduction of nickeliferous limonitic laterite ore by carbon monoxide
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DOI：
10.1179/1743285515y.0000000009
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
C. Pickles;R. Elliott
中科院分区：
文献类型：
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作者：
C. Pickles;R. Elliott
硫化镍矿床的开采成本越来越高，并且从含镍红土矿床中回收镍越来越受到关注。与硫化矿石相比，这些氧化矿石不能通过浮选或其他常规选矿技术进行选矿。一种潜在的选矿方法是对矿石进行固态火法还原，然后使用磁选进行提质。在这项研究中，开发了一个热力学模型，以研究一氧化碳对含镍褐铁矿红土矿石的固态还原。目的是回收所有镍作为高品位镍铁，并将针铁矿 (FeO·OH) 转化为方铁矿 (FeO)，以便通过后续磁选回收镍铁。对于煅烧矿石，在一氧化碳/矿石化学计量比为 0.558 kmol/100 kg 时，在 660°C 的最佳还原温度下，镍回收率可达 98%，镍品位可达 65%。结果表明，镍回收率和镍铁品位取决于还原温度和还原剂/矿石比。对于未煅烧的矿石，由于氧化电位增加，回收率略低，品位略高。
The nickel sulphide ore deposits are becoming more expensive to mine, and increasing attention is being paid to the recovery of the nickel from the nickeliferous laterite ore deposits. In contrast to the sulphide ores, these oxide ores cannot be beneficiated by flotation or other conventional mineral processing techniques. One potential concentrating method would be the solid state pyrometallurgical reduction of the ore followed by upgrading using magnetic separation. In this research, a thermodynamic model has been developed in order to investigate the solid state reduction of a nickeliferous limonitic laterite ore by carbon monoxide. The objective was to recover all of the nickel as a high grade ferronickel and convert the goethite (FeO·OH) to wüstite (FeO), so that the ferronickel could be recovered by subsequent magnetic separation. For the calcined ore, at the stoichiometric carbon monoxide/ore ratio of 0.558 kmol/100 kg, nickel recoveries of ∼98% and nickel grades of ∼65% were possible at an optimum reduction temperature of 660°C. The results showed that the nickel recovery and the grade of the ferronickel depended on the reduction temperature and the reductant/ore ratio. For the uncalcined ore, the recoveries were slightly lower and the grades slightly higher due to the increased oxidation potential.