南芬选矿厂矿石高压辊磨试验研究

Experimental Study on High Pressure Roller Mill of Ore in Nanfen Concentrator

为了解南芬选矿厂磁铁矿石的高压辊磨效果,在进行了矿样性质分析的基础上进行了高压辊磨试验,并对确定条件下的闭路辊压产品进行了湿式磁选试验。结果表明:TFe品位为33.25%、mFe品位为21.87%的矿样,20~0 mm进行辊压,高压辊磨机工作压力分别在8.0、10.0、12.0 MPa时,辊压产品5~0 mm粒级累计产率分别为70.60%、74.83%、76.61%,-0.074 mm粒级产率分别占7.50%、8.28%、8.50%;15~0 mm进行辊压,高压辊磨机工作压力分别在8.0、10.0、12.0 MPa时,辊压产品5~0 mm粒级累计产率分别为71.65%、75.51%、77.24%,-0.074 mm粒级产率分别占7.84%、8.96%、9.28%;闭路辊压试验筛孔宽分别为3、5 mm情况下的循环负荷为71.90%、38.70%,筛下产品-0.074 mm产率分别为15.41%、14.29%;高压辊磨闭路辊压产品(3~0 mm)湿式磁选试验精矿TFe品位为37.50%、mFe品位为26.73%、TFe回收率为91.38%、mFe回收率为99.03%,抛尾产率为18.98%、TFe品位为15.10%、mFe品位为1.12%。

In order to understand the effect of high pressure roller grinding for magnetite ore in Nan⁃fen Concentrator,the high pressure roller grinding test was carried out on the basis of the analysis of ore sample properties,and the wet magnetic separation test was carried out on the closed-circuit roller prod⁃ucts under the determined conditions.The results showed that the ore samples with TFe grade of 33.25%and mFe grade of 21.87%were rolled at 20~0 mm.When the working pressure of high pressure roller mill was 8.0,10.0 and 12.0 MPa,the cumulative yield of 5~0 mm grain size of rolled product was 70.60%,74.83%and 76.61%,respectively.The grain yield of-0.074 mm accounted for 7.50%,8.28%and 8.50%,respectively.When the working pressure of high pressure roller mill was 8.0,10.0 and 12.0 MPa with feeding particle size of 15~0 mm,the cumulative yield of 5~0 mm grain size was 71.65%,75.51%and 77.24%,respectively,and the yield of-0.074 mm grain size was 7.84%,8.96%and 9.28%,respec⁃tively.When the screen width was 3 mm and 5 mm,the cyclic load was 71.90%and 38.70%,and the yield of-0.074 mm was 15.41%and 14.29%,respectively.The concentrate from the wet magnetic separa⁃tion test of high pressure roller grinding closed circuit rolling product(3~0 mm)has a TFe grade of 37.50%,mFe grade of 26.73%,TFe recovery rate of 91.38%,mFe recovery rate of 99.03%,tail casting yield of 18.98%,TFe grade of 15.10%and mFe grade of 1.12%.