Desulfurization and deoxidization alloying process method in steel making ladle of electric arc furnace

Abstract

The invention discloses a desulfurization and deoxidization alloying process method in a steel making ladle of an electric arc furnace. The method sequentially comprises the process steps of smelting in the electric arc furnace, desulfurization and deoxidization alloying in the ladle and continuous casting / die casting and comprises the following concrete steps: (1) proportioning carbon by adopting one or combination of pig iron for steel making, molten iron and coke with the granularity of 5-40mm; (2) preparing foamed slag in the oxygen dissolving period of the electric arc furnace, discharging the slag automatically from a furnace door, replenishing lime, and adjusting the alkalinity of the furnace slag to be 3.5-4.5; (3) adding 100-140 DEG C to the liquidus temperature of the smelted steel grade, taking an upper limit of the tapping temperature of the steel smelted in a new furnace for the first time, and taking a lower limit of the tapping temperature of the steel smelted for the other times; (4) carrying out eccentric bottom tapping (EBT), wherein the process of roughing slag is strictly prohibited; (5) carrying out hot ladle tapping; when the tapping amount reaches 1 / 4, adding 0.5-2.0kg of steel making refining slag and 0.5-1.0kg of calcium carbide into the steel per ton; when the tapping amount reaches 1 / 3, respectively adding various types of iron alloys according to the needs of the concrete steel grades; when the desulfurization rate in the ladle is greater than or equal to 15%, controlling the sulfur content in the steel to be less than or equal to 0.030%; and (6) carrying out a ladle bottom-blowing argon process for 10min, and then, carrying out continuous casting or die casting; or standing the molten steel in the ladle for 7-14min, and then, carrying out continuous casting or die casting.

Description

technical field [0001] The invention relates to a desulfurization and deoxidation alloying process method in an electric arc furnace ladle. Background technique [0002] The existing desulfurization and deoxidation process for electric arc furnace steelmaking is: electric arc furnace smelting - LF furnace refining (deoxidation, desulfurization and alloying) - continuous casting / die casting. Among them, the 60min LF furnace refining process not only consumes high power and increases production costs, but also the hydrogen and nitrogen content will increase significantly during the LF furnace refining process, so it is necessary to optimize and adjust this process. Contents of the invention [0003] The object of the present invention is to provide a desulfurization and deoxidation alloying process method in an electric arc furnace steelmaking ladle, which can reduce production costs, reduce carbon emissions, and reduce steelmaking waste emissions. [0004] The purpose of t...

AI Technical Summary

Problems solved by technology

Among them, the 60min LF furnace refining process not only consumes a lot of electricity and increases production costs, but also the hydrogen and nitrogen content will increase significantly during the LF furnace refining process, so it is necessary to optimize and adjust this process