极贫赤铁矿石分粒级预选抛尾试验

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。

Classification Pre-concentration Discarding Test of Extremely Poor Hematite Ore

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 pre-selection 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 is 83.03%， the recovery rate to the original ore is 75.60%， and the tailings with a yield rate of 56.12% and an iron grade of 8.19% are discarded. The test results provide a research basis for the development and utilization of extremely poor hematite resources.