红土镍矿原矿性质及其对直接还原焙烧的影响机理  

Laterite ore properties and their influence mechanism on direct reduction roasting

作　　者：刘志国[1] 孙体昌[1] 蒋曼[1] 许言[1] 高恩霞[1] 刘真真[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《北京科技大学学报》2014年第11期1448-1455,共8页Journal of University of Science and Technology Beijing

基　　金：高等学校博士学科点专项科研基金资助项目(20130006110017)

摘　　要：以两种红土镍矿为研究对象,通过光学显微镜、电子显微镜、X射线衍射等手段对试样进行了分析,对比其异同点,并进行选择性还原焙烧实验,研究红土矿原矿性质对其还原焙烧的影响.结果发现,两种试样所含主要矿物相同,载镍矿相同,镍在原矿中分布规律也相似,但由于Fe、Si和Mg含量的差异造成其选择性还原焙烧-磁选结果有很大差异.其原因可能是焙烧过程中铁、镁、钙等阳离子和硅氧离子形成不同硅酸盐,影响了焙烧矿的熔融性和镍的反应活性.Two types of nickel laterite ores were chosen as the object of study. Optical microscopy, scanning electron microscopy and X-ray diffraction were used to analyze the similarity and difference between the two ores. Both the ores were beneficiated by a se-lective reduction roasting-magnetic separation method for studying the influence of ore properties on direct reduction roasting. It is found that the main minerals, nickel-bearing minerals and nickel distribution are very similar in the two ores. But due to the difference in content of iron, silicon and magnesium, the beneficiation results using the selective reduction roasting- magnetic separation are quite different. This is probably the reason that in the roasting process, iron, magnesium and calcium cations react with silicate anions to form different silicates, affecting the melting properties of roasting ores and the reactivity of nickel.

关 键 词：红土镍矿 矿物学 直接还原 焙烧 添加剂 硅酸盐 

分 类 号：TD952[矿业工程—选矿] TF815[冶金工程—有色金属冶金]