LF furnace refining method with high scrap ratio

Abstract

The invention discloses an LF furnace refining method with a high scrap ratio, which comprises the following steps that scrap steel is preheated, and the scrap steel is heated through a preheating device; the scrap steel is treated, specifically, the scrap steel in the preheating device is transferred into an LF furnace, reducing white slag is manufactured, components are initially adjusted, and meanwhile preheating is conducted; and the scrap steel is refined, specifically, the scrap steel is added into the LF furnace in multiple batches, and electrifying, heating and fine adjustment of a finished product are conducted in sequence. According to the method, the adding amount of the LF refining scrap steel can reach 100-120 kg per ton of steel; only scrap steel melting and heating time is increased in the refining period, the refining period is increased by about 2 min when 1 ton of scrap steel is used, the scrap steel is added in the electrifying process, and extra stirring and melting time is not needed; top slag is made before the scrap steel is added, and the temperature of the molten steel is kept within the range of 1575-1610 DEG C in the scrap steel adding process, so that high-efficiency deep desulfurization can be realized, and the influence of high scrap steel ratio on the sulfur increasing amount of the molten steel is reduced; and the scrap steel is reasonably added in batches, so that the scrap steel can be quickly melted and uniformly mixed.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy, in particular to an LF furnace refining method with a high steel scrap ratio. Background technique [0002] With the rapid development of China's steel industry in the past ten years, the accumulation of domestic steel has increased significantly, and social scrap steel has increased year by year. The generation of scrap steel resources can reach 200 million tons, and this trend will continue for a long time. Increasing the amount of steel scrap used in the long-process LF refining process can not only reduce carbon emissions, but also have great significance for reducing production costs and improving corporate benefits. [0003] Compared with adding scrap to converter, LF furnace refining process can effectively recycle beneficial elements and increase scrap steel absorption rate. At present, most LF furnaces consume less scrap steel, mainly because of the following problems i...

AI Technical Summary

Problems solved by technology

[0003] Compared with adding scrap to converter, LF furnace refining process can effectively recycle beneficial elements and increase scrap steel absorption rate. At present, most LF furnaces consume less scrap steel, mainly because of the following problems in LF refining process with high scrap steel ratio. On the one hand A huge temperature drop will affect the fluidity of molten steel, refining desulfurization, deoxidation, and alloying; on the other hand, scrap steel cannot be melted and mixed quickly and sinks into the bottom of the ladle, which will block or mechanically damage the ladle ventilation brick and the ladle water outlet, affecting the ladle. Bottom blowing air permeability and ladle self-opening rate

The emergence of the above problems will increase the difficulty of LF refining treatment and prolong the refining treatment cycle

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