Method for smelting with electric furnace

Abstract

The invention provides a method for smelting with an electric furnace. The method comprises the following steps: 1, adding a first iron and steel scrap material to the electric furnace, and adding lime to the iron and steel scrap material according to a case that 40-45kg of lime corresponds to each ton of the iron and steel scrap material; 2, blowing oxygen by an oxygen lance when the iron and steel scrap material near the oxygen lance melts or the iron and steel scrap material adjacent to the molten iron and steel scrap material is heated to hot heat; 3, starting blow carbon powder blowing when the power supply energy reaches 140-160kWh / tsteel; 4, stopping oxygen blowing and carbon powder blowing when the power supply energy reaches 185-215kWh / tsteel, and adding a second iron and steel scrap material to the electric furnace; 5, blowing oxygen by the oxygen lance when the iron and steel scrap material near the oxygen lance melts or the iron and steel scrap material adjacent to the molten iron and steel scrap material is heated to hot heat; 6, starting blow carbon powder blowing when the power supply energy reaches 165-185kWh / tsteel; 7, keeping the oxygen supply amount with the oxygen lance at 1.0-1.1m<3> / min.tsteel when the temperature of a molten pool reaches greater than 1565DEG C, and carrying out carbon powder blowing with a carbon spraying lance with the speed of 0.47-0.58Kg / min.t to prepare foamed slag; and 8, stopping oxygen supply and carbon powder blowing when the temperature of molten steel reaches 1620-1660DEG C to obtain molten steel containing low phosphor.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and more specifically relates to a method for improving electric furnace smelting by controlling an oxygen supply process and a carbon powder injection process. Background technique [0002] With the intensification of competition in the metallurgical industry at home and abroad, improving the competitiveness of the short-process electric furnace process has become an increasingly urgent issue. The most important thing is to use the electric furnace to strengthen the smelting technology to further shorten the smelting time of the electric furnace, reduce consumption, and thereby reduce costs. [0003] The realization of high-efficiency intensified smelting in ultra-high-power electric arc furnaces largely depends on the efficient use of oxygen. Cluster oxygen lances can efficiently feed oxygen into the cold spot area of ​​the furnace to accelerate energy conversion and metallurg...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of low oxygen lance life, long thermal shutdown time, poor stability of foam slag and low dephosphorization efficiency caused by the conventional oxygen blowing method of cluster oxygen lances in the ultra-high power electric furnace steelmaking process. The disadvantage is to provide a smelting method of oxygen supply process of electric furnace cluster oxygen lance, foaming slag by spraying carbon powder, and efficient dephosphorization process, so as to improve the service life of oxygen lance, use oxygen efficiently, and maintain foam slag for a long time , economical production of low-phosphorus molten steel, the purpose of greatly reducing consumption