本发明涉及一种低品位混合型铁矿石的破碎磁选焙烧预处理工艺，包括下列步骤：将铁品位为25%以下的混合型铁矿石经粗破至0mm‑300mm后，给入一段磁选机，一磁尾给入二段磁选机，二磁尾作为废石抛尾，一磁精和二磁精合并给入筛分作业；将筛上物料给入中破机，筛下物料与中破机排矿合并为三段磁选机的给矿；三磁尾给入四段磁选机，四磁尾作为废石抛尾，将四段磁选机的弱磁性矿物精矿进行焙烧，然后与三段磁选机的强磁性矿物精矿合并为品位为28‑30%的预处理产品。本发明的优点是：抛弃0 mm ‑300mm废石，提前抛尾，节能降耗；经过焙烧将赤铁矿转化为磁铁矿，利于后续单一磁选工艺处理。
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