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| Quantitative analysis of hot metal composition and TiO2 load #br# for effective furnace maintenance in Shougang Jingtang |
| ZHANG Jian |
| (Department of Ironmaking, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan 063200, Hebei, China) |
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Abstract The abnormal temperature rise of the hearth side wall of a blast furnace is a hard nut to crack for many enterprises. Currently, the furnace maintenance by adding titanium ores is a widely used technique. In order to achieve the effective furnace maintenance free of the titanium ore waste, and to protect the blast furnace condition from the pessimistic effect of the excessive titanium ore，the quantification of suitable mass percent of Ti in the hot metal is made according to the change of the hearth side wall temperature of blast furnaces in Shougang Jingtang. And the ranges of the mass percent of Si in the hot metal and the charged TiO2 load are narrowed down by linear regression analysis. The results indicate that w(Ti) and w(Si) in the hot metal and the charged TiO2 load of the No.1 BF should be controlled in ranges of 0.055%0.080%,0.20%0.35% and (6±0.5) kg/t, respectively. While the three parameters mentioned above of the No.2 BF are 0.08%0.13%,0.30%0.45% and (7±0.5) kg/t, respectively. More importantly, the more effort should be devoted to stabilizing the smelting temperature in the actual production to the protect hearth side wall. In addition, a good activity of the dead stock, a standard operation in the cast house and a rational cooling system are necessary.
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