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美国钢公司在铁山的明尼苏达铁英岩选厂的产量已从一九六七年的每年四百五十万吨提高到目前的每年一千二百五十万吨,矿石的年处理量为三千八百万吨。流程基本上是三段破碎后,再经三段磨矿,每一段磨矿后都经磁选。自卸式有轨矿车及车辆识别都是自动控制的,矿石重量、矿车和列车的数据和矿车位置都输入计算机。矿石给入破碎机,把破碎后的产品卸入矿仓,以及下面的二段破碎和三段破碎的数据都被记录下来。
The U.S. steel company’s production at the Minnesota Tieling rock processing plant in Tieshan has risen from 4.5 million tons per year in 1967 to 12.5 million tons per year at present. The annual processing capacity of ore is 38 million tons. The process is basically broken after three paragraphs, and then by three sections of grinding, after each grinding by magnetic separation. Tipping trolley and vehicle identification are automatically controlled, ore weight, tub and train data and the location of the car into the computer. The ore is fed into the crusher, the crushed product is discharged into the ore bin, and the data of the second-stage crushing and the third-stage crushing below are recorded.