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随着我国钢铁工业的发展,选矿技术的进步,因而铁精矿品位不断提高。鞍钢在1980年铁精矿品位将普遍达到65%以上,磁选精矿将达到66～67%,这样,烧结矿铁分亦将达55～57%。由于精矿品位高,SiO_2含量低,矿粉粒度细,目前的烧结操作便不适应,烧结矿质量下低。如本钢二铁厂,1975年烧结矿平均品位51.50%,碱度1.13,转鼓指数平均22.4%,而在1977年六七月份,烧结矿品位突破58%,平均56.54%,
With the development of China’s steel industry, the progress of beneficiation technology, so the grade of iron concentrate continuously improve. Ansteel iron ore concentrate in 1980 will generally reach more than 65% grade, concentrate concentrate will reach 66 ~ 67%, so that sinter iron will also reach 55 to 57%. Due to the high concentrate grade, low SiO 2 content and fine grain size, the current sintering operation is not suitable, and the sinter quality is low. For example, the second iron foundry of Benxi Iron and Steel Co., Ltd., the average grade of sinter was 51.50% in 1975, the alkalinity was 1.13 and the average drum index was 22.4%. In June and July 1977, the grade of sinter exceeded 58% with an average of 56.54%