High-efficiency and low-consumption desulfurization method of molten iron mechanical stirring

Abstract

The invention discloses an efficient low-consumption desulfurization method of molten iron mechanical stirring. According to the method, the efficient low-consumption desulfurization method of the molten iron mechanical stirring is provided, under the condition that existing equipment is not changed, the comprehensive aims of improving stirring and mixing dispersion effect of a desulfurizing agentand a kinetic condition of the molten iron desulphurization reaction, avoiding secondary desulfurization of the molten iron, reducing consumption and production cost of the desulfurizing agent, improving the production efficiency and the technical economic indexes and the like are achieved; and the efficient and stable production requirements of the low-sulfur steel is met.

Description

technical field [0001] The invention relates to the technical field of molten iron pretreatment, in particular to a method for desulfurization of molten iron with mechanical stirring with high efficiency and low consumption. Background technique [0002] Sulfur is one of the main harmful elements in iron and steel products (except for sulfur-containing steel types), and molten iron slag is one of the key factors affecting the economics of converter smelting technology. Therefore, sulfur in steel and molten iron slag entering the furnace must be removed as much as possible. To meet the high-efficiency smelting requirements of high-quality steel. For this reason, as early as the 1970s, hot metal desulfurization pretreatment and slag removal technology was applied on a large scale, and a comprehensive hot metal desulfurization pretreatment and slag removal technology featuring hot metal injection desulfurization or KR mechanical stirring desulfurization and mechanical slag remo...

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Problems solved by technology

[0007] To sum up, it can be seen that in order to improve the desulfurization effect of molten iron by mechanical stirring, in order to improve the stirring and mixing characteristics and improve the kinetic conditions of desulfurization reaction, many scholars have carried out a lot of theoretical research and practice, and some research results have achieved good results in actual production. However, because the molten iron mechanical stirring desulfurization reaction system involves high-temperature multiphase fluid mechanics and metallurgical reaction thermodynamics and kinetics, the metallurgical reaction system is very complex and has many influencing factors, resulting in poor adaptability of some research results and unstable improvement effects. It is difficult to apply, and there are obvious differences in equipment conditions and raw material conditions among different enterprises, which also makes the actual technical and economic indicators of hot metal desulfurization vary greatly among enterprises, which brings difficulties to the reasonable evaluation of research results

Referring to the relevant theoretical research results of the chemical industry, although a lot of research has been done on the stirring and entrainment dispersion process of the self-floating phase, the dispersion of self-floating particles is not much involved, and the specific improvement technology is not specific. It can be seen that even in the chemical industry , the stirring entrainment dispersion problem of the self-floating phase is also a very complicated problem

In addition, compared with the stirring and dispersing problems in the chemical industry, the characteristics of high temperature, invisibility, self-floating particle interface reaction, and surface deposition of reactants in molten iron mechanical stirring desulfurization lead to greater complexity.

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