重庆大学学报2017，Vol.40Issue(12)：43-51,9.DOI:10.11835/j.issn.1000-582X.2017.12.006
CaF2强化红土镍矿自还原过程中金属相聚集长大行为
Promoting effects of CaF2on the aggregation and growth of metal phases in self-reduction of laterite nickel ore
摘要
Abstract
In view of low-grade laterite nickel ore including high magnesium and silicon,the process of coalbased self-reduction,grinding and magnetic separation is utilized to produce ferronickel powders.The effects of C/O atomic ratio on the self-reduction of iron oxides and nickel oxides are investigated,as well as the influences of CaF2 on the reduction of oxides and the precipitation,aggregation and growth of metal phases in the self-reduction.The results show that under the action of CaF2 ,the reduction of iron oxides can be suppressed by reducing the C/O atomic ratio to obtain ferronickel owders in high-grade nickel but the recovery rate of nickel will be decreased.The low melting point tremolite(Ca2 Mg5 (Si4 O11 )2 F2 )is generated from the solid-state reaction between CaF2 and silicate gangue with high melting point,which can make the silicate minerals transform from island structure to chain structure,increase the reactivity of silicate minerals and then promote the reduction of nickel oxides and iron oxides.With the addition of CaF2 ,the melting temperature of laterite nickel ore gangue can be decreased.In that case, the precipitation,aggregation and growth of metal phases can be strengthened in self-reduction and then the separation of metal and gangue can be promoted.Accordingly,the grade of nickel and iron in ferronickel powders and the recovery rate of metal elements are improved significantly.关键词
红土镍矿/自还原/氟化钙/镍铁/聚集长大Key words
laterite nickel ore/self-reduction/CaF2/ferronickel/aggregation and growth分类
矿业与冶金引用本文复制引用
薛正良,肖承鹏,杭桂华,熊天宇,谢煜程..CaF2强化红土镍矿自还原过程中金属相聚集长大行为[J].重庆大学学报,2017,40(12):43-51,9.基金项目
国家自然科学基金资助项目(51404173).Supported by National Natural Science Foundation of China(51404173). （51404173）
