摘要
采用碳热还原法对稀有多金属混合精矿进行焙烧,利用XRD、SEM及EDS研究矿物在焙烧过程中形貌及物相的变化。结果表明,在低中温下焙烧,矿物的主要变化为Fe金属化率逐渐上升,铁矿石中Fe被还原,硅酸盐矿物中包裹的Fe析出并形成单质,伴生在铁矿物中的Nb、Mn和Ti形成氧化物,不被碳还原,而稀土矿物稳定,除部分(La, Ce)FCO_(3)矿物分解外,其他不反应。随着焙烧温度的升高,Fe单质与SiO2在碳热还原作用下反应生成FeSi,(La, Ce)FCO_(3)矿逐步分解,ZrSiO_(4)开始热解,形成小颗粒状ZrO2,其他金属化合物稳定。
Carbothermal reduction process was used to roast rare polymetallic mixed concentrate, and XRD,SEM and EDS were used to study the changes in the morphology and phase of the mineral during roasting.The results show that during roasting at low and medium temperatures, the main changes in minerals are as follows: Fe metallization rate gradually rises, Fe in iron ore is reduced, Fe encapsulated in silicate mine-rals precipitates and forms elementary substance, and Nb, Mn and Ti associated with iron minerals form oxides, which are not reduced by carbon, while rare earth minerals are stable and non-reactive, except for the partial decomposition of bastnaesite.As the roasting temperature increases, elemental Fe and SiO2 react to form FeSi by carbothermal reduction, bastnaesite is gradually decomposed, ZrSiO_(4) begins to be pyrolyzed to form small particles of ZrO_(2),and other metal compounds are stable.
作者
田杰
李梅
张宇旭
李凯
高凯
TIAN Jie;LI Mei;ZHANG Yu-xu;LI Kai;GAO Kai(Inner Mongolia University of Science and Technology,School of Materials and Metallurgy,Baotou 014010,China)
出处
《稀有金属与硬质合金》
CAS
CSCD
北大核心
2021年第2期15-19,共5页
Rare Metals and Cemented Carbides
关键词
稀有金属
混合精矿
焙烧
碳热还原
形貌
物相
rare metal
mixed concentrate
roasting
carbothermal reduction
morphology
phase
