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重钢高炉曾使用低品位矿石,SiO_2高,熟料比低,用于造渣的生熔剂消耗量在1000公斤/吨以上,成为高炉焦比高,技术经济指标差的基本原因。从1964年开始,研制并使用了碱度3.0以上的高碱度烧结矿,十多年来坚持并改进了高碱度烧结矿的高炉操作,使焦比降到700公斤/吨以下的水平。这种烧结矿理化性能的特点是熔剂性高,转鼓强度高,粒度小而均匀,还原性较好。缺点是含硫较高,粉末较多和易风化。见表1。据我们统计分析,十多年来焦比的起伏变化与
Heavy steel blast furnace has used low-grade ore, SiO 2 high, clinker ratio is low, the consumption of raw flux for slagging 1000 kg / ton, a high coke blast furnace, the technical and economic indicators of poor basic reason. Beginning in 1964, the development and use of high-alkalinity sinter with a basicity of 3.0 or more has insisted on and improved the operation of blast furnaces with high-basicity sinter for more than a decade to reduce the coke ratio to below 700 kg / tonne. The physical properties of sinter are characterized by high flux, high drum strength, small and uniform particle size and good reducibility. The disadvantage is higher sulfur content, more powder and weathering. See Table 1. According to our statistical analysis, the ups and downs of the coke ratio have been changing over the past decade