Total-converting steelmaking method of electric furnace

Abstract

The invention discloses a total-converting steelmaking method of an electric furnace. The method achieves the purposes of energy saving and consumption reducing through the working procedures containing adjustment for ratio of raw materials and strict control for the converting process. The method specifically comprises the following steps of: controlling the proportion of molten iron to be 71-79 percent; adding steel scraps through a furnace mouth for one time, and adding the molten iron through an iron exchanging mouth for two times; preheating, warming and decarburizing the steel scraps and molten steel in a furnace through a nozzle of an oxygen-burning system 3 installed on a furnace wall; during converting, regulating a corresponding gear according to demands, meanwhile converting with a furnace door oxygen gun, and making the converting efficiency to be maximized; adding slag making materials such as lime into the electric furnace to make slag; and when the molten steel achieves the temperature and components needed by steel grades, carrying out ladle deoxidization for steel tapping. Compared with the general steelmaking method of the electric furnace, the total-converting steelmaking method of the electric furnace has the advantages that electrode heating is cancelled, the consumptions of the electric energy, electrode and steel scrap are greatly reduced, the smelting cost per ton of steel is greatly reduced, the pollution is decreased, meanwhile the contents of harmful elements in the steel are reduced, and the product quality is increased.

Description

technical field [0001] The invention particularly relates to an electric furnace full-blowing steelmaking process with the characteristics of energy saving and consumption reduction, which belongs to the field of iron and steel metallurgy. Background technique [0002] The traditional electric arc furnace steelmaking production process is all cold charging scrap steel technology. The composition structure of furnace charge is mainly scrap steel, pig iron and other raw materials, supplemented by oxygen lance blowing, adding slagging material, and slag flow operation in the whole process. When the required steel is reached The steel can be tapped when the composition and temperature of the species are required, and then refined outside the furnace. This process requires the whole process of electrification to melt scrap steel, heating and decarburization, which consumes a lot of electric energy and takes a long time to smelt. [0003] Due to the shortage of high-quality steel...

AI Technical Summary

Problems solved by technology

However, the heat source for smelting is still mainly powered by electrodes, supplemented by blowing of furnace wall oxygen lances and furnace door oxygen lances. Compared with the converter steelmaking process, the cost per ton of steel for this process is about 350 yuan higher. The hot charging molten iron technology consumes a lot of energy (230-260KWh / t), serious electrode loss (2-4Kg / t), a large amount of scrap steel, and serious environmental pollution