Method for drying electric furnace by using molten iron

Abstract

The invention discloses a method for drying an electric furnace by using molten iron. The method comprises the following steps of: paving a layer of ramming material at the bottom of a newly-built furnace in advance; paving a layer of light and thin material which is a wood material and an iron sheet on the ramming material; adding scrap steel in an amount which is 20 to 35 percent based on the capacity of the furnace into the furnace; electrifying an electrode for arc ignition, slowly increasing power from 30-40MW to 60-70MW, and melting the scrap steel; opening an oxygen lance on a furnace wall, adding the molten iron in an amount which is 30 to 60 percent based on the capacity of the furnace into the furnace, and continuously electrifying for oxygen blowing to ensure that the scrap steel is completely melted; adding 0.03 to 0.05 ton of lime slagging material into 1 ton of steel, and performing the normal steel smelting process; measuring the temperature of molten steel by using a thermocouple, stopping electrifying and supplying oxygen when the temperature of the molten steel reaches 1,600-1,650 DEG C, and drying the furnace for 15 to 30 minutes; and tapping if the temperature and components of the molten steel reach the required ranges. The method has the advantages of low energy consumption, short time and low cost.

Description

technical field [0001] The invention relates to an electric furnace drying process, in particular to an electric furnace molten iron drying method, which belongs to the technical field of iron and steel metallurgy. Background technique [0002] After the interior of the electric furnace is built, in order to ensure its service life and prevent the refractory brick from bursting due to rapid heating, the newly built electric furnace must have a slow heating process, that is, the process of baking the new furnace. The initial operation is to use wood materials and coke to heat the oven, and the oven time is as long as 10 hours or more. At present, the "scrap + pig iron" direct smelting furnace operation is commonly used, and the two-step furnace method is commonly used, including the following steps: add pig iron and scrap steel to the furnace body, lay the pig iron on the middle and upper part of the scrap steel when charging, and smelt with electricity. At the same time, op...

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Problems solved by technology

[0003] The use of "scrap steel + pig iron" for oven has the following disadvantages: the process of two ovens is adopted, and the operation is relatively cumbersome. The second oven takes 10 to 20 minutes; it takes a long time, and the entire oven takes 2 to 2.5 hours; the power consumption is large, and because there is no other physical heat source, the high heat emitted by the electrode is directly used to melt the scrap steel and pig iron in the oven, so The electric energy consumption is huge, the average electricity consumption per ton of steel is 450-500 degrees; the electrode consumption is fast, due to the long power-on time and the high power of the electrode, the electrode consumption is fast, and the average electrode consumption is 4kg / t; the raw and auxiliary materials are expensive, one The proportion of pig iron added to the furnace steel is 30% to 40%, and the price of pig iron is relatively expensive. After conversion, the cost of the furnace is very high; the production rhythm is slow. As the first furnace steel for the furnace, the smelting period is very long. It affects the subsequent refining and continuous casting operations, making the entire production rhythm slow and uncoordinated; the pollution is serious, and long-term operation increases noise, radiation and dust pollution