A new type of high gradient magnetic separation was designed in this paper, which has the feature of introducing airflow into the separation region to increase the concentrate grade. This device was adopted for the tailing containing iron. The results indicated that the iron concentrate with the grade of 45.10% and the recovery of 48. 17% was obtained from the raw ore with the iron grade of 17.80% through the process ofcentrifugal separation for primarily removing tailings and one roughing one cleaning high gradient magnetic separation. The grade of the iron concentrate can be improved by the gas curtain attributed to bubble agitation and negative pressure and strong fluctuation produced from bubble crushing. Meanwhile, the bubble can make the mineral particles stay in the separation process, decreasing the grade of tailings.%本文设计了一种新型气幕辅助高梯度磁选模型,其特点是在分选区域引入上升的气泡群以提高精矿品位.利用该设备对含铁尾矿进行选铁试验,结果表明,通过离心选初次抛尾,再经过一粗一精高梯度磁选,可从铁品位为17.80％的原矿中,得到铁品位为45.10％,回收率为48.17％的铁精矿.气幕能提高铁精矿品位归功于气泡的搅拌作用和气泡破碎时形成的负压及强扰动,同时气泡使矿物颗粒在分选区停留时同延长,可降低尾矿品位.
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