Zero-power consumption steel-making method using electric-arc furnace

Abstract

The invention discloses a zero-power consumption steel-making method using an electric-arc furnace. The zero-power consumption steel-making method specially comprises the following steps of: controlling the proportion of steel scrap in a furnace burden structure at 20%-30% and the proportion of molten iron at 70%-80%; pushing the steel scrap in a vertical shaft into the furnace by a hydraulic device, wherein the pushing speed is 1-3t / min; adding the molten iron to the furnace at twice through a molten iron adding chute for the furnace wall, wherein the primary molten iron accounts for 40%-80% of the total amount of the molten iron, the iron addition speed is 15-30t / min, the secondary molten iron accounts for 20%-60% of the total amount of the molten iron, and the iron addition speed is 4.5-6.5t / min; simultaneously adding lime to the furnace for slagging, and blowing oxygen for smelting; and when the temperature and components of the molten iron meet the technological requirements, finishing smelting in the electric-arc furnace. The zero-power consumption steel-making method can prevent the molten iron and furnace slag from overflowing from a furnace gate, thus reducing the consumption of slag charges and steel in the smelting process.

Description

technical field [0001] The invention relates to an electric arc furnace steelmaking method with zero power consumption. Specifically, the invention relates to an electric arc furnace steelmaking method that reduces the overflow of molten steel and slag from the furnace door during the smelting process under the condition of a high ratio of hot metal to molten iron, and belongs to iron and steel metallurgical field. Background technique [0002] Traditional electric arc furnace steelmaking uses scrap steel, pig iron, etc. as raw materials, mainly through arc heating to melt and heat up the charge, which consumes a lot of electric energy and takes a long time to smelt. In recent years, with the continuous rise of scrap steel prices and electricity prices, the cost pressure of electric arc furnace steelmaking has been increasing. For this reason, Jiangsu Shagang Group, Anyang Iron and Steel Company, Nanjing Iron and Steel Group and other major domestic steel mills have adopted...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems existing in the smelting of the existing electric arc furnace without electricity, the purpose of the present invention is to provide an electric arc furnace steelmaking process, which can be realized under the condition that the ratio of hot charging molten iron is 70% to 80%. Smelting with zero power consumption can solve problems such as splashing and dephosphorization difficulties in the smelting process, and can also reduce the consumption of iron and steel materials and slag materials