蛇纹石矿物的高温相变对红土镍矿直接还原的影响.pdf

第25卷第5期
中国有色金属学报
2015年5月
Volume 25 Number 5
The Chinese Journal of Nonferrous Metals
May 2015
文章编号:1004-0609(2015)-05-1332-07
蛇纹石矿物的高温相变对
红土镍矿直接还原的影响
刘志国,孙体昌,高恩霞,王晓平
(北京科技大学土木与环境工程学院,北京100083
摘要:红土镍矿所含的蛇纹石矿物在焙烧过程中会出现脱羟基和重结晶等相变。选取两种不同试样进行直接还
原焙烧一磁选实验,硏究蛇纹石的高温相变对直接还原焙烧红土镍矿的影响。对两种红土镍矿进行热重分析、XRD
衍射分析和扫描电镜分析,研究两种红土镍矿中的蛇纹石矿物在焙烧过程中相变过程的异同及其对直接还原的影
响。结果表明:两种试样所含主要矿物为蛇纹石和针铁矿,其热重分析曲线相似;在焙烧过程中,试样2在较低
温度下出现橄榄石相。在最终的焙烧矿物相中,与试样1相比,试样2中出现石英相;与试样2相比,试样1的
蛇纹石颗粒内部在焙烧后形成较多裂隙。因此,试样2的镍回收率较低
关键词:红土镍矿;蛇纹石;直接还原;相变
中图分类号:TD925;TF55
文献标志码:A
Effect of high-temperature phase transition of serpentine mineral on
direct reduction roasting of laterite nickel ore
LIU Zhi-guo, SUN Ti-chang, GAO En-xia, WANG Xiao-ping
(School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China)
Abstract: The phase transitions of dehydroxylation and recrystallization will happen in the roasting process of serpentine
mineral in the laterite nickel ore. To study the effect of phase transition of serpentine on the direct reduction of laterite
nickel ore, the direct reduction roasting-magnetic separation test was conducted on two samples. The similarities and
differences of phase change of the two kinds of laterite nickel ore in the process of roasting and the influence on direct
reduction roasting were analyzed by TGA, XRD and SEM. The results show that two kinds of samples contain the same
main minerals of serpentine and goethite, and the TGA curves are similar. Olivine phase appears earlier in Sample 2 at
low temperature in the roasting process. The quartz phase appears in the final roasting mineral phases of Sample 2 but not
in that of Sample I. Compared with Sample 2 there are more fracture in serpentine particles of Sample 1 after roastin
Therefore, the nickel recovery rate of Sample 2 is lower
Key words: laterite nickel ore; serpentine; direct reduction; phase transition
镍矿床按地质成因主要分为岩浆型硫化镍矿床和
红土镍矿是超基性岩暴露在表生环境后受到氧
风化型红土镍矿床,目前60%以上的镍产量来源于硫化、水解和碳酸等作用,经长期风化沉积形成的,其
化镍矿。但随着镍的需求不断增加,可供开发的硫主要的载镍矿物是针铁矿和蛇纹石、绿泥石等含镍的
化镍资源逐渐短缺,因此,从储量丰富的红土镍矿中硅酸盐矿物2引。根据红土镍矿的性质不同,目前主要
提取镍成为了研究的热点。
的处理方法可以大致分为火法工艺、湿法工艺、火法
基金项目:高等学校博士学科点专项科研基金资助项目(20130005107
收稿日期:2014-09-05;修订日期:2015-01-09
通偕作者:孙体昌,教授,博士,电话:010-62314078:E-mail: sunoco@ces.ustb.edu,cn