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目前,重介质选煤厂中所用的加重剂是磁铁矿粉,故都用磁力回收法回收稀介质中的磁铁矿粉。因此,使这一部份磁性介质受到磁感应作用,当其脱隔磁场后仍有“剩磁”。如图1曲线所示,这条曲线表示外磁场的强度与磁铁矿粉磁感应的关系。当外磁场强度增加时,初期磁铁矿粉的磁感应增加较快,以后渐渐减慢,当磁
At present, heavy medium used in coal preparation plant weighting agent is magnetite powder, it is recovered by magnetic recovery of magnetite powder in dilute medium. Therefore, to make this part of the magnetic medium by magnetic induction, when the magnetic field after they have “residual magnetism.” As shown in the curve of Fig. 1, this curve shows the relationship between the intensity of the external magnetic field and the magnetic induction of magnetite powder. When the intensity of the external magnetic field increases, the magnetic induction of the initial magnetite powder increases rapidly, and then gradually slows down. When the magnetic