明塔克铁燧岩采选企业位于明尼苏达州芒廷艾恩市,由美国钢铁公司经营,是美国铁矿石球团的主要来源。年生产能力达1350万长吨。1968年,系明塔克企业投产的第一年,球团二氧化硅含量平均为5.51%。至70年代末期,所处理的矿石变得较难解离,球团二氧化硅含量增至6.29%。细筛和精选磁选机的投产使球团二氧化硅含量又降至5.4%。自1988年浮选设备安装以来,大部 The Minttax taconite mining company, based in Mountain Athin, Minnesota, is operated by U.S. steel companies and is the main source of iron ore pellets in the United States. Annual production capacity of 13.5 million tons long. In 1968, the Department of Ming Tucker put into operation the first year, the average silica content of 5.51% pellets. By the late 1970s, the treated ore became more difficult to dissociate and the pellet silica content increased to 6.29%. Fine screening and selection of magnetic separator put into operation so that the pellet silica content dropped to 5.4%. Flotation equipment since 1988, most of the installation