Blowing desulfurization method for molten iron of torpedo ladle

Abstract

The invention discloses a blowing desulfurization method for molten iron of a torpedo ladle. The method sequentially comprises the following steps of: inputting molten iron, carrying out temperature measurement, sampling, blowing by using two L-shaped spray lances, adding a slag diluting modifier, putting up the lances to terminate blowing, carrying out temperature measurement, sampling, adding a heat insulation agent and outputting the molten iron, wherein in the step of blowing by using the lance, the two L-shaped spray lances are inserted in the torpedo ladle in a cross tilting manner so as to simultaneously carry out blowing desulfurization, and the blowing ports of the two L-shaped spray lances are respectively directed to two end walls of the torpedo ladle. The blowing desulfurization method for the molten iron of the torpedo ladle is high in desulfurization efficiency, high in production capacity, simple in operation, convenient in implementation, stable in desulfurization and low in cost and is suitable for being widely applied to the field of molten iron pretreatment.

Description

technical field [0001] The invention relates to the field of molten iron pretreatment, in particular to a torpedo pot molten iron injection desulfurization method. Background technique [0002] Sulfur is the main impurity element in steel and must be removed to the greatest extent during the steel smelting process. With the continuous improvement of users' requirements for steel quality, the requirements for sulfur content in steel are becoming more and more stringent, and the importance of hot metal desulfurization is also becoming more prominent. Hot metal pretreatment desulfurization is very beneficial to improving the technical and economic indicators of steelmaking and improving the quality of steel, and has become an essential and important process in the iron and steel metallurgical process. In the past 40 years, a lot of research has been done on the thermodynamics, kinetic mechanism and reactor theory and practice of molten iron pretreatment, making its process tec...

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Problems solved by technology

The document "Yu Xuebin et al., Physical simulation of molten iron flow field in 320t torpedo tank, Henan Metallurgy, 2006, Supplement" records that the new design of the spray gun structure has a good influence on the reaction kinetics of the TDS method. The structure shows that the inverted Adding a suppressing injection port to the T-shaped spray gun can promote the circulation of molten iron in the torpedo tank. Compared with the conventional inverted T-shaped spray gun, the sulfur return of molten iron is reduced by an average of 50%, but there is no report on actual production and application.

In addition, the Chinese patent application "Li Jiang, Hu Tieshan, Wang Gang, etc. Method and device for pretreatment of molten iron by multi-directional composite injection of mixed iron cars, patent application publication number: CN1461812A, 2003.12.17", aimed at the large flow dead zone of the TDS method, Due to the lack of high sulfur return in molten iron, a technical measure was proposed to inject inert gas into the torpedo tank with gas supply bricks to strengthen the stirring of molten iron, that is: install breathable refractory bricks at the bottom and side of the torpedo tank, and spray desulfurization at the same time as the spray gun , spray inert gas into the molten iron through the breathable brick, strengthen the stirring of the dead zone of the torpedo tank, promote the circulation of the molten iron in the torpedo tank, expand the reaction interface between the desulfurizer and the molten iron, and increase the reaction speed of the desulfurizer and the molten iron, but there is no reports to actual production

[0004] Based on the above-mentioned analysis of the characteristics of the torpedo tank molten iron injection desulfurization technology and the technical development status in the past ten years, for the TDS method and ATH method that have been popularized and applied at present, the ATH method has better desulfurization reaction kinetics conditions, but for The problem of poor desulfurization reaction kinetics caused by the slender structure of the torpedo tank, although some improvement measures studied have achieved good improvement results in the laboratory, are not implemented due to difficulties in implementation, insufficient reliability, and cumbersome operations. It can be applied in actual production. Therefore, it is necessary to develop new technology research that is simple to implement, easy to operate, stable and reliable, and has excellent improvement effects, so as to continuously improve the vitality of the torpedo tank injection desulfurization process and its technical requirements for smelting steel. adaptability

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