温度对铌精矿配碳球团铁和铌选择性还原的影响  

Effect of Temperature on Selective Reduction of Fe and Nb in Carbon-matched Pellets of Niobium Concentrate

作　　者：张福顺 赵增武[1,2] 李岩 杜治宇 ZHANG Fu-shun;ZHAO Zeng-wu;LI Yan;DU Zhi-yu(Key Laboratory of Integrated Exploitation of Bayan-Obo Multi-Metal Resources,Baotou 014010,China;Inner Mongolia Autonomous Regional Engineering Technology Research Center of Sustainable Exploitation of Rare Earth Secondary Resources,Baotou 014010,China;Materials and Metallurgy School,Inner Mongolia University of Science and Technology,Baotou 014010,China)

机构地区：[1]内蒙古自治区白云鄂博矿多金属资源综合利用重点实验室,内蒙古包头014010 [2]内蒙古自治区稀土二次资源可持续利用工程技术研究中心,内蒙古包头014010 [3]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《稀有金属与硬质合金》2020年第6期14-19,共6页Rare Metals and Cemented Carbides

基　　金：国家自然科学基金(50964011);内蒙古自然科学基金(2017MS(LH)0522);内蒙古自治区重大基础研究开放课题(20140201);内蒙古高校基金(NJZY14166,NJZZ17159);内蒙古科技大学产学研合作培育基金(PY-201306)。

摘　　要：探索铌精矿选择性还原可行性,研究温度对铌精矿配碳球团铁和铌选择性还原的影响,以及含铁物相和含铌物相在还原过程中的赋存状态。结果表明,随着铌精矿还原温度的提高,铁矿物的还原金属化率也随之提高,当反应温度为1050℃时,可有效将铌精矿中赤铁矿还原为金属铁,但还原产物中尚存一定量铁橄榄石,造成还原金属化率仅76.16%。铌精矿配碳球团内部还原气氛CO含量处于72.4%附近,远未达到碳气化理论平衡时的99%。还原过程中铌矿物仍为含氧物态,有利于后续铌铁分离,可实现铌精矿中铁和铌选择性还原的工艺期望。The feasibility was explored of selective reduction of niobium concentrate,and the effect was studied of temperature on the selective reduction of iron and niobium in carbon-matched pellets of niobium concentrate,as well as the occurrence states of iron-bearing phases and niobium-bearing phases in the reduction process.The results show that as the reduction temperature of niobium concentrate increases,the reduction metallization rate of iron minerals also increases.When the reaction temperature is 1050℃,the hematite in the niobium concentrate can be effectively reduced to metallic iron.However,there is still a certain amount of iron olivine in the reduction product,resulting in a reduction metallization rate of only 76.16%.CO content of the reducing atmosphere inside carbon-matched pellets of niobium concentrate is around 72.4%,which is significantly lower than 99%,the theoretical equilibrium value of carbon gasification.During the reduction process,niobium minerals remain in an oxygen-bearing state,which is beneficial to the subsequent separation of iron and niobium.The technological expectation of selective reduction of iron and niobium in niobium concentrate can be realized.

关 键 词：铌精矿 配碳球团 碳热还原 铌铁分离 金属化率 物相转变 CO分压 

分 类 号：TF841.6[冶金工程—有色金属冶金]