摘要
为了对包头稀土尾矿中的铁进行回收,同时兼顾稀土、铌的富集,采用"煤基直接还原—弱磁选"对稀土浮选尾矿进行了铁的回收试验。考察了焙烧温度、保温时间、配碳比对直接还原产品的金属化率的影响,以及磁场强度对磁选产品铁的品位、回收率和产率的影响。研究发现:在磨矿粒度-200目,焙烧温度为1200℃,保温时间为2 h,固定C/O=1.00的条件下,采用煤基直接还原,得到金属化率86.59%的还原矿;再对还原矿采用磁选管以160 kA.m-1的磁场强度进行弱磁选,从TFe=25.40%的稀土尾矿获得的磁选产品全铁品位达到82.36%,产率为32.08%,回收率达82.91%,稀土、铌均在磁选渣中富集。
In order to recycle the iron in the rare earth tailings and take account of the concentration of niobium and rare earth,the ＂direct reduction with coal-weak magnetic separation＂ was adopted on the rare earth tailings to carry out the experiment.The experiment schedules were designed as follows： The influences of roasting temperature,soaking time and fixed C/O on the metallization rate were researched.According to the result of this paper,when the roasting temperature was 1200 ℃,soaking time was 2 h and fixed C/O was 1.00,the metallization rate of the direct reduction production could reach 86.59%.In the experiment of weak magnetic separation,the influences of magnetic density on grade,yield and recovery of the rare-earth tailings reduced with coal were researched.The following results were found out through the study： The iron concentrate is 82.36% in grade,32.08% in yield and 82.91% in recovery,when the magnetic density is 160 kA · m^-1.Rare earth and niobium were both concentrated in the weak magnetic separation tailings.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2012年第4期470-475,共6页
Journal of the Chinese Society of Rare Earths
基金
973重大项目课题(2012CBA01205)
教育部高校基金课题(N110502002)资助
关键词
稀土浮选尾矿
煤基直接还原
弱磁选
rare earth flotation tailings
direct reduction with coal
weak magnetic separation
