What is the significance of smelting low silicon pig iron?
Since the founding of the people's Republic of China, smelting of low silicon iron has been greatly developed. In 1950 the BF silicon content in pig iron decreased from 1.5% to 0.8% ~ 1.O%, the molten iron can be directly sent off for open hearth steelmaking, refining furnace, the production efficiency is greatly improved. In 1956 the silicon content in pig iron is reduced to about 0.5%, especially since 1979, Shougang Group, Baosteel Hangzhou Iron and steel plant was gradually reduced to o.3% ~ 0.4%, promote the low silicon iron smelting technology in China rapid development, a substantial increase in economic efficiency.
Smelting low silicon pig iron can not only increase the blast furnace output, reduce the consumption of ton iron and coke, but also is an effective means to improve the steel-making efficiency, reduce the steelmaking cost and greatly improve the economic efficiency of the steel production.
According to statistics in Hangzhou, Hangzhou Iron and steel production conditions, silicon content decreased 1.33%, converter utilization rate increased by 18% ~ 20%, the cost per ton lower 72.9 yuan. The silicon content of pig iron is reduced from 1.18% to 0.4126 to 0.54%, and the amount of converter scrap is increased by 44kg/t, and the lime is reduced by 67kg/t. Of iron, silicon content in pig iron by 1%, production increased by 5% ~ 6%, coke rate decreased by 48 ~ 75kg/t.
In the implementation of the low silicon iron smelting technology, pay special attention to the smelting condition, can not ignore the objective conditions and the temperature of the molten iron to the one-sided pursuit of molten iron silicon content is low low silicon iron smelting has a low limit in smelting conditions. For example, in Hangzhou Iron and steel production conditions, the appropriate iron production practice summed up the content of silicon is 0.3% ~ 0.4%, insufficient temperature of molten iron is lower than 0.3%, production increased difficulty, but also requires external conditions particularly strict, very difficult.
