微细粒级钛铁矿预富集工艺研究

Optimization of Preconcentration Process to Reclaim Microfine Ilmenite

针对攀西地区微细粒级钛铁矿作为矿泥丢弃的问题,进行了强化微细粒级钛铁矿的预富集研究。采用高梯度强磁选、离心选矿、悬振锥面流膜选矿进行微细粒级钛铁矿的预富集,并分别与浮选组成联合选别流程。对比分析表明:强磁、离心、悬振预富集精矿回收率分别为38.92%,65.57%和35.56%;悬振预富集精矿粒度及矿物组成较离心预富集的优,有利于后续浮选作业;悬振+浮选流程简单,开路浮选试验获得TiO_2品位47.39%、回收率24.93%的钛精矿。悬振预富集工艺为微细粒级钛铁矿的最佳预富集工艺。

To recover microfine ilmenite from Panzhihua-Xichang region,which was previously discarded as slime,the preconcentration technique was adopted for enrichment. High gradient magnetic separation( HGMS),centrifugal separation( CS) and hanging vibrating cone separation( HVCS) were adopted as preconcentration processes,and the effects of each separately combined with flotation were as well compared. The results showed that the process of HGMS,CS and HVCS could lead to the recovery of 38. 92%,65. 57% and 35. 56%,respectively. The particle size distribution and mineral compositions of rough concentrate for HVCS were superior to those for CS,which may benefit the subsequent flotation operation. With this simple HVCS-flotation flowsheet,an ilmenite concentrate with TiO_2 grade and recovery of47. 39% and 24. 93%,respectively,was obtained from an open-circuit flotation. It is concluded that HVCS was the best preconcentration approach for microfine ilmenite.