Method for controlling circulating furnace number of decarburization slag in less slag smelting process of converter

Abstract

The invention discloses a method for controlling a circulating furnace number of decarburization slag in less slag smelting process of a converter, and mainly solves the problem that recycling times of slag in a decarburization period in the less slag smelting process of the converter is not high in the prior art. The technical scheme of the invention is that the method for controlling the circulating furnace number of the decarburization slag in the less slag smelting process of the converter includes the following steps: top-bottom combined smelting of the converter is utilized, and the weight percentage of raw materials of invested metal main materials is 80 to 93% of molten iron, and the balance is light scrap steel; desiliconization and dephosphorization are performed through converter blowing; slag removal is performed after desiliconization and dephosphorization periods of the converter are finished; decarburization is performed through the converter blowing; steel tapping is performed after the converter blowing is finished; and remaining slag and slag splashing are sequentially performed for protecting the converter after the steel tapping of the converter is finished. Byadoption of the method of the invention, the continuous circulating furnace number of the decarburization slag of the converter can be stabilized at more than six, and compared with conventional lessslag smelting process of converters, the consumption of auxiliary materials of slagging of the converter is reduced by 20% to 40%, thereby reducing the smelting cost of molten steel.

Description

technical field [0001] The invention relates to a method for smelting molten steel in a converter, in particular to a method for controlling the number of circulating furnaces for decarburization slag in the slag-less smelting process of the converter, and belongs to the technical field of steel smelting and continuous casting. Background technique [0002] China's iron and steel industry has developed rapidly in the past 20 years and has played an important role in the rapid growth of the national economy. However, it is currently facing enormous pressure and challenges in terms of saving resources, energy, and reducing solid waste emissions such as slag. Taking oxygen converter steelmaking, which accounts for more than 90% of China's steel production, as an example, about 620 million tons of crude steel are produced annually, and more than 60 million tons of slag are produced, and more than 31 million tons of lime and more than 7 million tons of lightly burned dolomite are ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for controlling the number of decarburization slag circulation furnaces in the converter less-slag smelting process, mainly to solve the technical problem that the number of slag recycling times in the decarburization period of the converter less-slag smelting process in the prior art is not high

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