The concentrated magnetic separator is designed for concentrated magnetic separation process of low concentration pulp, pulp concentration increased. Is mainly used for grinding and separation process in high frequency sieve screen on the coarse pulp into the grinding operation when the increase of pulp density, to improve the milling grinding efficiency, reduce the production cost. And fine-grained concentrated magnetic separators in iron concentrate into filtration improve pulp density, to improve the filter operation efficiency and operation quality, can effectively reduce the moisture of iron concentrate powder.