Converter multi-mode smelting method based on molten iron grading system

Abstract

The invention provides a converter multi-mode smelting method based on a molten iron grading system. The converter multi-mode smelting method comprises the following steps: firstly, selecting grading indexes of molten iron, formulating the molten iron grading system, designing blowing modes matched with different grades of molten iron according to the different grades of molten iron, firstly obtaining components and temperature of the molten iron before charging, and selecting the corresponding blowing mode to assist in completing smelting. According to the method, the molten iron with large component fluctuation is classified based on the 'differential' thought in mathematics, the molten iron falling into the same category can be regarded as stable, the same blowing mode is adopted, stable blowing of the converter can be achieved, blowing accidents caused by large fluctuation of the molten iron are avoided, the dephosphorization effect can be improved to a certain degree, and material consumption can be reduced, the slag production amount is reduced, the smelting period is shortened, and the good metallurgical effect is achieved.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a multi-mode smelting method suitable for small, medium and large converters based on the classification of molten iron. 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 a restrictive link that is difficult to improve the level of converter operation and automation of converter steelmaking. Therefore, we should try our best to ensure that the physical and chemical properties of the incoming raw materials are basically consistent, and based on this, we should stabilize the smelting operation before the furnace, promote the standardized operation mode, realize the highly automated converter steelmaking, i...

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.

Images