A multi-mode smelting method based on molten iron classification system

Abstract

The invention provides a converter multi-mode smelting method based on the molten iron classification system. First, the classification index of the molten iron is selected, the molten iron classification system is formulated, and the matching blowing mode is designed for the molten iron of different grades, and the molten iron is first obtained before charging. composition and temperature, and select the corresponding blowing mode to assist in the completion of smelting. The invention is based on the idea of ​​"differentiation" in mathematics, and classifies molten irons with relatively large fluctuations in composition. The molten irons falling in the same category can be regarded as stable, and the same blowing mode can be used to realize the stable blowing of the converter. It avoids blowing accidents caused by large fluctuations of molten iron, not only can improve the dephosphorization effect to a certain extent, but also can reduce material consumption, reduce slag production, shorten smelting cycle, and have good metallurgical effects.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a multi-mode smelting method based on molten iron classification suitable for small, medium and large converters. Background technique [0002] At present, domestic crude steel is still mainly produced by a long process, which includes sintering, blast furnace, converter and other processes. In the converter steelmaking process, poor raw material conditions are the crux of the difficulty in promoting standardized operations, and it is also the limiting link that is difficult to improve the converter operation level and the degree of converter steelmaking automation. Therefore, it is necessary to ensure that the physical and chemical properties of the raw materials entering the furnace are basically the same, and based on this, the smelting operation before the furnace is stabilized, the standardized operation mode is promoted, the converter steelmaking with a high degree of au...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a multi-mode smelting method aimed at grading molten iron. Aiming at problems such as large fluctuations in molten iron composition and unstable blowing, the molten iron is divided into multiple types based on the two indicators of molten iron Si and molten iron temperature. Each type of molten iron composition and temperature fluctuation range becomes smaller, which can be regarded as a stable, matching and reasonable blowing mode, so that after obtaining the molten iron composition and temperature information, which type of molten iron it belongs to can be used The corresponding blowing mode is used to solve the problems of large fluctuations in the composition of molten iron and unstable blowing control, and to achieve stable blowing and reduce consumption.

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