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含铌、稀土多金属铁矿石的选矿

Release date:2018-12-25  source:中南选矿网  Browse times:520
 
我国包头钢公司选矿厂处理的原矿由白云鄂博铁矿供给。该铁矿为一大型沉积变质-热液交代型含、稀土多属铁矿床。矿石中含有铁、铌、稀土、、钡、、氟及等71种元素,其中铁、稀土、铌、氟等均有综合利用价值。矿石中铁矿物主要为赤铁矿、磁铁矿、假像赤铁矿及少量黄铁矿、褐铁矿、菱铁矿。稀土矿物主要为独居石、氟碳
矿、磷石、氟碳钙铈矿等。铌矿物主要为铌铁矿、黄绿石、易解石、铌钙矿、钛铁金红石等。脉石矿物主要为萤石、钠辉石、方解石、钠长石、钠闪石、白云石、石英、玉髓、云母等,该铁矿石的主要特点是:元素多,组成复杂,综合利用价值高;矿物种类多,稀土元素赋存集中;矿物嵌布粒度细,分布均匀。因此属于难选矿石。
该选矿厂采用如图9-1-8所示磁-重-浮联含选矿工艺流程,经磨矿后矿石先用弱磁选机选出强磁性铁矿物,然后用浮选选出品位为15%左右的稀土泡沫,再用强磁选机选出弱磁性铁矿物,与强磁性铁矿物合并为铁精矿。对稀土泡沫用摇床选别得到粗精矿、中矿和尾矿、粗精矿和中矿用浮选继续选别,用环肟酸铵作捕收剂,经一粗一精浮选后,可得到稀土品位大于60%的精矿。如欲再提高精矿品位,可继续精选,经五次精选后,即可得到品位68%(REO)以上的稀土精矿。摇床中矿再经粗选、精选,可得到品位30%(REO)左右的稀土次精矿。

 
 
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