新型干式磁选机分选品位影响因素试验研究

内蒙古包头市固阳地区干旱少雨，复杂难选的赤铁矿石分布广泛，原矿TFe品位仅为13.51%，传统磁选设备分选指标较差，产品竞争力不足。为此，研究新型三级干式永磁筒式磁选机分选品位的影响因素，在风速为5 m/s的条件下，考察了不同磁辊分布方式下转速及入选矿石粒度对永磁干式磁选试验指标的影响。结果表明，磁辊高中低排布时滚筒最佳转速为120 r/min，磁辊低中高排布时滚筒最佳转速为140 r/min；磁滚筒磁场排布为高中低时，分选效果要优于低中高的磁场排布，此时精矿的产率和TFe品位指标更优；对于该新型永磁干式磁选机，较好的工作参数为滚筒磁场强度由上至下排布为0.23 T、0.17 T、0.11 T，转速为120 r/min，入料粒度为-2 mm，此时能够获得精矿TFe品位34.62%、尾矿TFe品位10.95%。试验结果为进一步提高三级干式永磁筒式磁选机的性能提供了技术参数，同时为低品位赤铁矿石资源开发和利用提供了研究基础。

Experimental Study on Influence Factors of Separation Grade of a New Type Dry Magnetic Separator

Guyang area of Baotou City in Inner Mongolia is dry and less rain， in which hematite is widely distributed and difficult to be separated. The TFe grade of the raw ore is only 13.51%， and the separation indexes with traditional magnetic separation equipment are poor， resulting in the lack of competitiveness. Thus， the influencing factors of the separation grade of the new three-stage dry-type permanent magnet drum-type magnetic separator were studied. Under the condition of wind speed of 5 m/s， the influences of the rotation speed and the particle size of selected ore on the test indexes of dry-type permanent magnet magnetic separator under different distribution modes of magnetic rollers were investigated. The results show that the optimum speed of the drum is 120 r/min in high， medium and low magnetic field distribution， and the optimum speed of the drum is 140 r/min in low， medium and high magnetic field distribution. When the magnetic field arrangement of the drum is high， medium and low， the sorting effect is better than that of low， medium and high magnetic field arrangement， performing the better concentrate yield and TFe grade. For this new type of permanent magnet dry magnetic separator， the better working parameters are the drum magnetic field strength from top to bottom of 0.23 T， 0.17 T and 0.11 T， rotation speed of 120 r /min， the feeding particle size of -2 mm，brought out the concentrate of the TFe grade of 34.62% and the tailings of the TFe grade of 10.95%， respectively. The experimental results provide technical parameters for the further research on improving the performance of the three-stage dry-type permanent magnet drum-type magnetic separator and a research basis for the development and utilization of low-grade hematite resources.