降低MgO含量对高炉渣黏度和熔化性温度的影响

以高炉生产中实际渣样为基础,检测不同炉渣成分对炉渣黏度和熔化性温度的影响,对降低炉渣中MgO含量的可行性进行研究。实验结果表明,当wAl2O3为15%,在炉况稳定,炉缸温度充沛的情况下,二元碱度较高(1.2左右),可将wMgO下降到4%~6%;二元碱度较低(1.1左右),可将wMgO下降到5%~6%,保证炉渣适宜的流动性,不影响高炉正常运行。同时结合CaO-SiO2-MgO-Al2O3相图和等黏度图分析,当炉渣中wMgO为5%,从1 500℃降为1 400℃时所对应的黏度值上升最快,这与实验数据相一致。

Effect of reduction of MgO content in BF slag on viscosity and melting temperature

Based on the actual slag of blast furnace, the effect of different slag composition on viscosity and melting temperature was tested. The feasibility of reduction of MgO content in BF slag was also studied. The experiment results show that under the conditions of wAl2O3 of 15%, if the BF performance is stable and the hearth temperature is high enough, the wMgO can drop to 4%??6% when the binary basicity is higher(1.2 or so); the wMgO can drop to 5%??6% when the binary basicity is lower(1.1 or so). The appropriate liquidity of slag can be ensured and the BF normal operation wouldn??t be affected. Through the analysis of phase diagram and iso- viscosity diagram of CaO- SiO2- MgO- Al2O3 system, when the wMgO is 5%, the viscosity of slag rises most rapidly when the temperature drops from 1 500 ?? down to 1 400 ??, which is consistent with the experiment results.