弧形选铁机主要由弧形选铁设备、导流筒、排铁装置和支架等4部分组成。弧形选铁设备是产出磁源的部件，是系统的核心，外观呈弧形，环绕于导流筒的外表面;导流筒替代了圆筒筛，直接和球磨机上的喇叭口相连接。碎球于磁系作用下吸附于提升筒的里壁上，与球磨机同步运转，吸附的碎铁球运动到磁系的较高点即进入无背景磁场区域，在惯性与重力作用下落入到螺旋排铁装置里，末后再由排铁机构输送到集铁斗中。

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