磁铁矿粉的真密度应该达到重介质旋流器分选的磁铁矿粒度，小轮（或立轮），重介质分选机选块煤的磁铁矿粉粒度，小于0.075mm的含量应该达到90%以上。四氧化三铁还是导体,因为在磁铁矿中由于Fe2+与Fe3+在八面体位置上基本上是无序排列的，电子可在铁的两种氧化态间迅速发生转移，所以四氧化三铁固体具有优良的导电性。还可以通过某些化学反应，比如使用亚硝酸钠等等，使钢铁表面生成一层致密的四氧化三铁，用来防止或减慢钢铁的锈蚀，例如枪械、锯条等表面的发蓝、发黑。
      Magnetite ore powder true density should be heavy medium cyclone separation of magnetite particle size, small round (or round), heavy medium separation pause lump coal magnet mineral powder particle size, the content of less than 0.075 mm should be above 90%. Ferroferric oxide or conductor, because in magnetite because of Fe2 + and Fe3 + in octahedral position of disordered arrangement is basically, electrons can in iron quickly shift between two kinds of oxidation state, so ferroferric oxide solid has good electrical conductivity. Can be controlled by some chemical reactions, such as the use sodium nitrite, etc., make the steel surface to generate a layer of dense ferroferric oxide, used to prevent or slow down the corrosion of the steel, such as firearms, blue and black on the surface of the blade, etc.
       化学反应让磁铁矿粉履立丰功伟绩，不断被更多的消费者所信赖！泰安立人磁性材料是磁铁矿粉最佳的选择之地。
       Chemical reaction to the magnet kuangfen shoe set untidier office-mate, constantly being more consumers trust! Taian people magnetic material is the best choice type magnet.