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1986年初,酒泉钢铁公司接受甘肃省科委和冶金厅下达的任务,研制JGDG-450×3120型感应辊式强磁选机。1987年1月开始进行工业试验,样机共运转3026h,其中负荷运转1071h。当台时能力25t时,一次干式分选20～4mm镜铁山粉矿,原矿铁品位31.16％,可获得产率85％、铁品位34.43％、回收率93.98％的粗粒精矿,当台时能力23.19t时,一次干式分选20～0mm粉矿,原矿铁品位30.61％,可获得产率87.49％、铁品位33.03％,回收率
In early 1986, Jiuquan Iron and Steel Company accepted the task assigned by Gansu Provincial Science and Technology Commission and the Metallurgical Department to develop JGDG-450 × 3120 type induction roller strong magnetic separator. 1987 January began industrial tests, a total of 3026h prototype operation, of which 1071h load operation. When the station capacity of 25t, a dry sorting of 20 ~ 4mm mirror Tieshanfen ore, iron ore grade 31.16%, yield 85%, iron grade 34.43%, 93.98% recovery of coarse ore concentrate, when When the capacity was 23.19t, a dry sorting 20 ~ 0mm powder ore, iron ore grade 30.61%, yield 87.49%, iron grade 33.03%, the recovery rate