深度还原分离回收含铌铁尾矿中铌和铁的试验研究  

Efficient separation of niobium and iron from tailings of niobium and iron by depth reduction

作　　者：林海[1,2] 高月娇 董颖博[1,2] 张悦[1,2] 张文通[1,2] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]北京科技大学土木与环境工程学院,北京100083

出　　处：《武汉科技大学学报》2014年第2期81-85,共5页Journal of Wuhan University of Science and Technology

基　　金：国家863计划资助项目(2012AA062402)

摘　　要：以某稀土综合尾矿经磨矿-磁选-浮选处理后的含铌铁尾矿为对象,采用深度还原焙烧的方法分离回收铌和铁,研究还原焙烧条件对铌、铁分离效果的影响。结果表明,还原剂种类对铁回收率的影响较为显著,对铌的分离回收影响相对较小,还原剂为褐煤时铁回收率最高;还原时间的延长、焙烧温度的升高以及助熔剂用量的增加均有利于铌、铁的分离回收;在还原剂褐煤用量为10%、助熔剂用量为15%、还原时间为60min、还原温度为1300℃的条件下可实现含铌铁尾矿中铌、铁的高效分离回收,得到w(TFe)为94.82%的铁精矿,铁回收率为99.53%,同时还得到w(Nb2O5)为0.3519%的铌粗精矿,铌回收率为99.62%。In light of the complex properties of rare earth tailings from magnetic separation and flota-tion ,this paper describes an efficient approach to recovering iron and niobium that uses low-intensity magnetic separation after reduction roasting and studies the influence of reduction roasting parameters on niobium and iron separation .T he results show that the reductant type has a huge influence on iron recovery yet little impact on niobium recovery and w hen the reductant is lignite ,iron recovery is the greatest .The extension of the reduction time ,the increase of roasting temperature and the increase of flux amount have a good effect on iron and niobium separation .When the consumption of the reduc-tant lignite is 10% and that of flux is 15% ,reduction for 60 min at the temperature of 1300 ℃ can a-chieve high-efficiency separation and recovery of niobium and iron from tailings of niobium and iron , with the grade of obtained iron concentrate at 94 .82% ,iron recovery at 99 .53% ,the grade of ob-tained niobium concentrate at 0 .3519% and niobium recovery at 99 .62% .

关 键 词：稀土尾矿 煤基还原 含铌矿物 含铁矿物 磁选分离 

分 类 号：TD954[矿业工程—选矿]