高炉铁水降硅的实验研究

从理论上分析了降低铁水中硅含量的三个途径:控制硅源;降低滴落带的高度;增加炉缸渣中的氧化性.在实验室进行了降低铁水中硅含量的实验,得到了铁水中硅含量的影响因素:提高二元碱度有利于降硅;增加渣中氧化物可降低SiO2的活度有利于降硅;Al2O3和SiO2不利于降硅;冶炼时焦炭中SiO2的挥发量随温度的升高而增多,使铁水中硅含量增加;随着滴落带高度的增加,铁水中硅含量不断增加.根据实验室研究针对唐山建龙公司高炉特点提出降低铁水中硅含量的措施,降硅效果明显,铁水中硅的质量分数由原来的0.55%左右降到了0.40%左右.

Experimental research of reducing the silicon content of hot metal

Three methods were analyzed to reduce the silicon content of hot metal in theory: controlling silicon resource,decreasing the drip zone's altitude,and increasing the oxidation of slag in hearth.Some factors to influence the silicon content of hot metal were proposed on the basis of the experiment in the lab: increasing the binary basicity is favorable to desiliconization;the oxide in slag debases the silicon activity and is of great advantage to desiliconization;Al2O3 and SiO2 are disadvantageous to desiliconization;the volatilization content of SiO2 in coke increases with increasing smelting temperature,leading to increase the silicon content of hot metal;the silicon content of hot metal increases with increasing the drip zone's altitude.The measures of reducing the silicon content of hot metal were applied in JIAN-Long Iron and Steel Company in Tangshan according to the test results.The result of reducing the silicon content of hot metal was obvious,and the mass fraction of silicon in molten iron was reduced to 0.40% from 0.55%.