Combined stirrer for mechanical stirring desulfurization of molten iron and preparation method thereof

Abstract

The invention discloses a combined stirrer used for mechanical stirring desulfurization of molten iron and a manufacturing method of the combined stirrer. The combined stirrer comprises a stirring shaft and a connecting flange arranged over the stirring shaft. The stirring shaft is composed of a shaft section and a blade section from top to bottom. A plurality of composite stirring blades are symmetrically arranged on the outer wall of the blade section. Each composite stirring blade comprises a metal framework. The stirring shaft comprises an air cooling pipe and a stirring shaft metal core. A metal end cap is arranged at the bottom of the inner wall of the stirring shaft metal core. A plurality of connecting metal cores are evenly distributed on the outer wall of the stirring shaft metal core of the blade section in the circumferential direction in a welded mode. Each connecting metal core is welded to the corresponding metal framework along the radial outer side of the stirring shaft. According to the structure and manufacturing method of the combined stirrer, and the comprehensive purposes of simple structure, easy, convenient and efficient manufacturing, high cyclic utilization rate of the stirrer, low cost, excellent desulfurization stirring and mixing property and the like can be achieved.

Description

technical field [0001] The invention relates to the field of molten iron pretreatment, in particular to a combined stirrer for mechanical stirring desulfurization of molten iron and a preparation method thereof. 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 r...

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Problems solved by technology

Not only does it take a lot of manpower, material and financial resources to dismantle the used agitator with only broken mixing blades, but it also takes a lot of manpower, material and financial resources to repair the metal core of the stirring shaft, other parts of the metal core and refractory materials. The preparation of the lining takes up a lot of working time and equipment workbench, resulting in a high cost of agitator preparation, which affects the profitability of the agitator preparation unit, and also intensifies the consumption cost of the agitator for hot metal desulfurization, affecting the cost of the steel plant. Profitability; in addition, a large number of demolition residues are piled up and discarded, and dust is flying, high-decibel noise, debris splashing, etc. during the demolition process, which brings serious environmental pollution and safety hazards

It can be seen that based on the basic characteristics of the agitator damage concentrated on the agitating blades, in view of the various deficiencies in the preparation process of conventional agitators that only retain the metal core of the agitator shaft, how to reduce the cost of agitator preparation and improve the repair of the agitator after use. The value and efficiency of agitator repair and preparation are the key technologies to realize the improvement of profit space for both the agitator manufacturer and the user. However, no relevant research has been carried out at home and abroad, and there are no relevant patents and technical literature reports.

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