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从五十年代中期开始,酸性球团矿投入大规模工业生产,这主要是在美国;开采上湖区的铁燧岩贫矿所获得的铁精矿粒度很细,不宜于烧结,采用氧化焙烧球团工艺却很适合处理细精矿;球团在高炉冶炼的效果也很好,此外球团矿有良好的机械性能,特别适宜于氏期贮存、长途运输等优点;因此在六十年代中,世界各地陆续建立大型球团生产基地。随着选矿技术的进展和各地矿粉物理化学性质的不同,在实践中就暴露出新的技术问题。上湖区和北美许多球团厂的精矿都有一个共同的特点,这就是SiO_2相当高,
Since the mid-1950s, sour pellets have been put into large-scale industrial production mainly in the United States. The iron ore concentrate obtained from the mining of taconite in the Upper Lake region is very fine in grain size and should not be sintered, The process is very suitable for processing fine concentrate; pellets in the blast furnace smelting effect is also very good, in addition to the pellets have good mechanical properties, especially suitable for Shi’s storage, long-distance transport and other advantages; so in the sixties, Large-scale pellet production bases have been established around the world. With the progress of beneficiation technology and the different physical and chemical properties of ore powder, new technical problems have been exposed in practice. The concentrate in the Upper Lake and many North American pellet plants share a common feature, which is that SiO 2 is quite high,