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按球团矿在鞍钢2 580 m3高炉内不同高度位置的温度条件、气氛及停留时间,在实验室动态模拟了炉料在高炉内的升温还原变化过程。通过球团升温还原膨胀试验、不同温度下恒温还原试验和900℃标准检测结果对比分析,得出了在高炉条件下的还原膨胀率低于检验标准的900℃膨胀率;鞍钢球团矿还原膨胀在正常范围内,但对弓一球团还原膨胀也应引起重视。鞍钢高炉使用酸性球团矿的配比在20%~30%时,熔滴性能相差不大。高炉使用球团矿比例由25%提高到30%后,炉况波动的主要原因不在于球团矿比例增加。通过生产一定镁或钙含量的球团均可降低球团矿还原膨胀及改善熔滴性能,从而可提高球团矿使用比例。
According to the temperature conditions, the atmosphere and the residence time of the pellets at different heights in the 2 580 m3 blast furnace in Anshan Iron and Steel Co., Ltd., the process of temperature increase and reduction in the blast furnace was simulated dynamically in the laboratory. Through pellet temperature reduction and expansion test, different temperature thermostatic reduction test and 900 ℃ standard test results were compared and analyzed, obtained under blast furnace conditions, the reduction and expansion rate is lower than the test standard 900 ℃ expansion; Angang pellet reduction and expansion Within the normal range, but the reduction of a pellet bow also should pay attention. Anshan Iron and Steel blast furnace using acidic pellets ratio of 20% to 30%, the droplet performance or less. After the proportion of blast furnaces using pellets increased from 25% to 30%, the main reason for fluctuations in furnace conditions is not the increase in the proportion of pellets. Through the production of certain magnesium or calcium content of pellets can reduce pellet reduction and expansion and improve the droplet properties, which can improve the proportion of pellets.