美国矿业局对苏必利尔湖地区的细嵌布赤铁矿矿石作了试验室和半工业浮选试验。试验室试验的矿样采自默萨比矿区,矿样含46％赤铁矿、3％针铁矿;35.3％Fe,42.8％SiO_2。半工业试验的三个矿样均采自马凯特矿床,含铁34.8～38.4％,主要含铁矿物为假象赤铁矿,并有少量针铁矿和残存的磁铁矿。半工业试验流程包括两段磨矿至95％—35微米(棒磨、球磨及旋流器分级),在强碱介质中加木 The U.S. Bureau of Mines conducted laboratory and semi-industrial flotation tests on finely cut hematite ores in the Lake Superior area. The ore samples from the laboratory tests were collected from the Mossabei mine. The ore samples contained 46% hematite and 3% goethite; 35.3% Fe and 42.8% SiO_2. All three samples from the semi-industrial test were collected from the Marquette Deposit with iron content of 34.8-38.4%. The major iron-bearing minerals are illusion hematite with a small amount of goethite and residual magnetite. The semi-industrial pilot process consists of two stages of grinding to 95% to 35 microns (rod mill, ball mill and cyclone grading), wood in a strong base medium