Stirrer used for molten iron mechanical stirring and efficient mixing desulphurization

Abstract

The invention discloses a stirrer used for molten iron mechanical stirring and efficient mixing desulphurization. The stirrer is composed of a stirring shaft and stirring blades. Each stirring blade comprises an iron meeting face and an iron opposing face, wherein the iron meeting face is composed of an upper vertical face section of the iron meeting face and a lower forerake face section of the iron meeting face, the iron opposing face is composed of an upper vertical face section of the iron opposing face and a lower forerake face section of the iron opposing face, the width b1 of the upper vertical face section of the iron meeting face and the width b1 of the upper vertical face section of the iron opposing face are both 0.25-0.35 time the diameter d of a stirrer impeller, and the width b2 of the lower forerake face section of the iron meeting face and the width b2 of the lower forerake face section of the iron opposing face are both 0.35-0.65 time the diameter d of the stirrer impeller. The stirrer used for molten iron mechanical stirring and efficient mixing desulphurization can achieve the comprehensive purposes of expanding the stirring and mixing zone of a desulfurizer, prolonging the entraining and floating-upward circulating stroke of the desulfurizer in molten iron, improving the mixing and dispersing degree of desulfurizer particles and the desulphurization efficiency of the molten iron, and prolonging the service life of the stirrer in the practical production.

Description

technical field [0001] The invention relates to the field of molten iron pretreatment, in particular to a stirrer for mechanical stirring and efficient mixing and desulfurization of molten iron. Background technique [0002] The document "External desulfurization of molten iron, Shanxi Metallurgy, 2007, No1" reported that molten iron is the basic raw material for molten steel smelting, and its chemical composition and physical properties determine the quality of steel products and the benefits of enterprises to some extent. Therefore, Since the 1970s, people began to pay attention to the development of molten iron pretreatment technology, and continuously improved its technology and methods to remove harmful elements in molten iron. In addition to sulfur-containing steel, sulfur is one of the main harmful elements in steel, but in the process of blast furnace ironmaking, it is necessary to increase the alkalinity of slag and furnace temperature, which will reduce the technic...

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Problems solved by technology

[0006] The purpose of the present invention is based on the domestic and foreign KR stirring desulfurization stirring structure parameters of the influence theory and experimental research results on the stirring mixing characteristic parameters and the vortex entrainment characteristics of the conventional single-layer cross-blade stirrer KR mechanical stirring desulfurization, aiming at its local The mixed desulfurizer is not uniformly mixed and dispersed, and the fluid dynamic conditions of the desulfurization reaction are poor. A stirrer for mechanically stirring molten iron for efficient mixing and desulfurization is provided. The stirrer has the advantages of simple structure, easy preparation, long service life, desulfurizer It has the characteristics of large stirring and mixing area, long stroke and uniform dispersion of desulfurization agent in hot metal entrainment and floating cycle, and high desulfurization efficiency.

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