某微细粒赤铁矿选矿工艺研究

Study on the Beneficiation Process of a Certain Micro-fine-grained Hematite

对某微细粒赤铁矿分别采用阶段磨矿—重选—弱磁选—高梯度强磁选—反浮选工艺流程和阶段磨矿—弱磁选—高梯度强磁选—反浮选工艺流程进行了选别试验,前者获得的铁精矿铁品位为64.88%,铁回收率为79.91%,后者获得的铁精矿铁品位为65.45%,铁回收率为79.84%。从选别指标、流程结构及磨矿成本考虑,推荐采用阶段磨矿—弱磁选—高梯度强磁选—反浮选工艺流程。

The two beneficiation flow-sheet experiments are carried out for a certain micro-fine-grained hematite,respectively,which consist of the process of stage grinding-gravity separation-low intensity magnetic separation-high gradient and intensity magnetic separation-inverse flotation and the process of grinding-low intensity magnetic separation-high gradient and intensity magnetic separation-inverse flotation.The first process got the iron concentrate upgrading of 64.88% with 79.91% iron recovery;The second process obtained iron concentrate upgrading of 65.45% with 79.84% iron recovery.Considering the separation index,flow-sheet structure and grinding costs,the process of stage grinding-low intensity magnetic separation-high gradient and intensity magnetic separation-inverse flotation is recommended.