Oxygen supplying method for smelting slag steel and slag iron by electric arc furnace

Abstract

The invention discloses an oxygen supplying method for smelting slag steel and slag iron by an electric arc furnace, which can reduce power consumption. The electric arc furnace is respectively provided with a furnace wall oxygen gun and a furnace door oxygen gun to supply oxygen, wherein the furnace wall oxygen gun is mounted on a furnace wall, the furnace wall takes the central line of a furnace gate as a standard and an included angle of 90-120 DEG is formed between one side of the furnace wall which is far away from a furnace cover rotary arm and the central line of the furnace gate; the distance between a gun opening and the liquid level of a melting pool is 500-600 mm and the installation included angle is 38-45 DEG; the furnace wall oxygen gun is opened to a keeping mode and materials are prepared to be added; after the materials are added, the electric arc furnace starts to supply power; the flow of the furnace wall oxygen gun is gradually increased along the melting; when melting-down carbon is more than or equal to 0.30%, a high-oxygen mode of the furnace wall oxygen gun is started to carry out decarburization, temperature rising and slagging; and when the carbon content of the melting pool reaches the requirements of a steel type, the furnace wall oxygen gun is adjusted to a keeping mode and steel tapping is carried out after a steel tapping condition is met. The method is good for accelerating the melting of the furnace materials and rapidly carrying out a steel liquid carbon oxygen reaction, so that the smelting time of the electric furnace can be effectively shortened, the smelting power consumption is reduced, the productivity is improved and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of iron and steel smelting, in particular to an improved oxygen supply process for an electric arc furnace used for smelting slag, steel, and iron. Background technique [0002] Using electric arc furnace to smelt slag steel slag iron has been a technology successfully applied in practice. At present, enterprises that use slag steel and slag iron as raw materials for EAF steelmaking production are relatively backward in the research on the oxygen supply process of EAF. Some directly use artificial oxygen pipes to blow oxygen, and some copy the method of smelting alloy steel in EAF The process uses furnace door oxygen lances and 2 to 4 furnace wall oxygen lances for oxygen supply, and its smelting time and smelting power consumption are relatively high, and the production cost is relatively high. Contents of the invention [0003] In order to overcome the deficiency of high power consumption in smelting slag, steel ...

AI Technical Summary

Problems solved by technology

At present, enterprises that use slag steel and slag iron as raw materials for EAF steelmaking production are relatively backward in the research on the oxygen supply process of EAF. Some directly use artificial oxygen pipes to blow oxygen, and some copy the method of smelting alloy steel in EAF. Oxygen supply using the furnace door oxygen lance and 2 to 4 furnace wall oxygen lances, the smelting time and smelting power consumption are high, and the production cost is high

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