磁鐵礦是一種氧化鐵的礦石，主要成份為Fe3O4，是Fe2O3和 FeO 的復合物，呈黑灰色，比重大約5.15左右，含Fe72.4％，O 27.6％，具有磁性。
開采的礦石先由顎式破碎機進行初步破碎，在破碎至合理細度后經由提升機、振動給料機均勻送入球磨機，由球磨機對礦石進行粉碎、研磨。經過球磨機研磨的礦石細料進入下一道工序：分級。螺旋分級機借助固體顆粒的比重不同而在液體中沉淀的速度不同的原理，對礦石混合物進行洗凈、分級。礦物顆粒在被送入浮選機，根據不(bu)(bu)同的礦物(wu)特性加入(ru)不(bu)(bu)同的藥物(wu)，使得所(suo)要的礦物(wu)質(zhi)與其他(ta)物(wu)質(zhi)分離開(kai)。
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