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梅钢5号高炉在生产中炉渣(Al_2O_3)含量一般在15.5%左右,长期以来在高炉炉料中加入蛇纹石熔剂,维持其传统经验认可的高铝渣的(MgO)/(Al_2O_3)需要维持在0.5以上的技术原则以获得合适的炉渣黏度等冶金性能,但产生了渣量增加及高炉下部透气性恶化等问题。为此梅钢高炉根据辅助炉渣相图理论开展了渣系结构优化研究及冶炼实践,结果表明:适当提高炉渣R_2可以降低炉渣黏度改善流动性,对于(Al_2O_3)在15.5%~16.0%的炉渣,(MgO)在7.O%~7.5%,R_2控制在1.20~1.25,能够满足高炉冶炼需求;在(Al_2O_3)含量达到15.73%炉渣条件下,通过渣系、炉料结构及操作制度等冶炼技术的调整优化,发挥系统协同作用,高炉能够获得良好的技术经济指标,全年平均利用系数达到2.262 t/(m~3·d),燃料比达到492 kg/t。
In the production of No.5 blast furnace in Meishan Iron and Steel (Group) Co., Ltd., the content of slag (Al 2 O 3) is generally about 15.5%. Serpentine flux has long been added to blast furnace charge to maintain its traditional experience of high MgO / (Al 2 O 3) In the 0.5 or more technical principles to obtain the appropriate slag viscosity and other metallurgical properties, but there has been an increase in the amount of slag and the lower part of the blast permeability deterioration. Therefore, based on the auxiliary slag phase diagram theory, the slag structure optimization research and smelting practice were carried out. The results show that proper raising of slag R 2 can reduce the viscosity of slag and improve the fluidity. For slag with (Al 2 O 3) of 15.5% ~ 16.0% (MgO) range from 7.O% to 7.5% and R_2 to 1.20 ~ 1.25, which can meet the needs of blast furnace smelting. When the content of (Al_2O_3) reaches 15.73%, the slag system, charge structure and operation system Adjustment and optimization, play a synergistic role in the system, the blast furnace can obtain good technical and economic indicators, the annual average utilization coefficient reached 2.262 t / (m ~ 3 · d), the fuel ratio reached 492 kg / t.