Smelting process for reducing consumption of molten iron in whole process

Abstract

The invention provides a smelting process for reducing consumption of molten iron in the whole process. The smelting process comprises the steps that adding steel scraps accounting for 1%-2% of the weight of molten iron into an iron trough before iron making and melting the steel scraps through waste heat of the molten iron; adding iron ladle steel scraps with thenominal capacity being 5%-8% intoan iron ladle before the molten iron is poured into the iron ladle, through online baking, increasing the temperature of the steel scraps, reducing the temperature drop during adding the iron to the iron ladle and improving the melting efficiency of the steel scraps when the iron is added to the iron ladle from a torpedo ladle; adding converter steel scraps with the nominal capacity being 20%-25%to a converter during converter smelting, adding after-boiler steel scraps with the tapping amount being 1%-2% to the converter during converter tapping and adding after-boiler steel scraps to a steelladle with the molten steel weight being 1%-2% during LF refining. Through the smelting process, the consumption of the molten iron at the smelting steps can be substantially reduced, and the steel scraps are recycled and utilized. Compared with a conventional smelting process, the smelting process has the advantage that under the condition of the same molten iron amount, the yield of the moltensteel can be increased by 15% or above.

Description

technical field [0001] The invention relates to a smelting process for reducing the consumption of molten iron in the whole process, and belongs to the technical field of converter steelmaking. technical background [0002] With the depletion of iron ore resources and the continuous increase of the country's environmental protection of the iron and steel industry, the production of molten iron as the main raw material for the steelmaking process has begun to be affected, and the supply of molten iron has decreased significantly, while the corresponding scrap steel resources However, it keeps increasing, especially after the state banned intermediate frequency induction furnace smelting, and the scrap steel resources are more abundant. How to produce qualified molten steel under the conditions of low iron consumption and high scrap steel ratio has become the focus of attention of various iron and steel enterprises. Although the traditional electric furnace production process ...

AI Technical Summary

Problems solved by technology

Although the traditional electric furnace production process can meet the production requirements of high scrap steel ratio and low molten iron, at present, domestic steelmaking plants mainly use converters. If the converter is converted into an electric furnace, the investment cost is high; and the converter is affected by the heat of molten iron. The amount of steel scrap added is only about 20%, and the consumption of molten iron is very large; in order to solve such problems, some iron and steel enterprises have conducted research and achieved certain results, such as: a Chinese patent application with patent number 201710850784.0 discloses a The method of raising the temperature of converter steelmaking with low consumption of molten iron. This method is to increase the proportion of scrap steel in the converter and reduce the consumption of molten iron. Coke and ferrosilicon are used as heating agents to compensate the heat of the converter. The purpose is to reduce the consumption of molten iron in the converter. , How to reduce the iron consumption after the furnace, and after adopting this method, the stability of the converter operation is greatly affected, and the life of the converter lining and the bottom blowing effect of the converter are also greatly affected