极贫赤铁矿石分粒级预选抛尾试验

Classification Pre-concentration Discarding Test of Extremely Poor Hematite Ore

鞍山地区齐大山极贫赤铁矿石TFe品位为18.25%,金属矿物以赤铁矿为主,脉石矿物以石英为主。为提高矿石预选效果,对其进行了分粒级预选抛尾工艺试验。采用筛孔尺寸为3 mm的筛子筛分后,在双辊转速为1.25 m/s条件下,采用双辊强磁预选磁选机对3～15 mm粒级进行干式强磁预选,预选精矿采用实验室型高压辊磨机细碎至P80为1.62 mm,与筛下-3 mm粒级混合,采用SCG-150型湿式永磁高梯度磁选机进行湿式预选,预选精矿TFe品位可达31.44%,作业回收率83.03%,对原矿回收率为75.60%,抛除总产率为56.12%、铁品位为8.19%的尾矿。试验结果为极贫赤铁矿资源的开发和利用提供了研究基础。

There is 18.25% TFe in the extremely poor hematite from Qidashan iron ore in Anshan area,main metal mineral is hematite,and the gangue mineral is mainly quartz. In order to improve the pre-selection index,a classification pre-selection tail-splitting process test was carried out. After screening with sieve size of 3 mm,dry-type high intensity magnetic preselection of 3~15 mm fractions was carried out by a two-roller high intensity magnetic preselection magnetic separator at double-roller speed of 1.25 m/s. The pre-concentrate was finely crushed to P80 of 1.62 mm by laboratory high pressure roller mill,and then mixed with the-3 mm size fraction of under sieve,and wet-preselected by SCG-150 wet permanent magnetic high gradient magnetic separator. The pre-selected concentrate TFe grade can reach 31.44%. The recovery rate of the operation is83.03%,the recovery rate to the original ore is 75.60%,and the tailings with a yield rate of 56.12% and an iron grade of8.19% are discarded. The test results provide a research basis for the development and utilization of extremely poor hematite resources.