Combined stirring blade metal core for molten iron KR desulfurization stirrer

Abstract

The invention discloses a combined stirring blade metal core for a molten iron KR desulfurization stirrer. The metal core comprises a rectangular metal thick plate, large-diameter metal round bars andsmall-diameter metal round bars, wherein the large-diameter metal round bars are evenly welded to the outer side face of the rectangular metal thick plate at intervals in a single row in the axial direction of the stirrer, and each large-diameter metal round bar is perpendicular to the rectangular metal thick plate; small-diameter metal round bars are welded to the outer end faces, the front sidefaces and the rear side faces of the large-diameter metal round bars, and small-diameter metal round bars are welded to the upper side face of the uppermost large-diameter metal round bar and the lower side face of the lowermost large-diameter metal round bar. The stress distribution of the stirring blade is uniform, the crack initiation and crack development of the refractory material lining aredelayed, and the structural damage of the stirring blade is restrained under the service condition; therefore, the service life of the stirrer is greatly prolonged, the on-line initial maintenance time of the stirrer is prolonged, the on-line maintenance amount and maintenance cost of the stirrer are reduced, and stirring midway offline caused by ablation of a stirring blade metal core and largestripping of upper and lower corners is avoided.

Description

technical field [0001] The invention relates to the technical field of molten iron pretreatment, in particular to a combined stirring blade metal core for a molten iron KR desulfurization agitator. Background technique [0002] According to relevant reports, hot metal desulfurization pretreatment is the most economical process for reducing the mass fraction of sulfur in steel in the blast furnace converter-continuous casting process, and is also one of the important means to improve the operation of blast furnaces and converters. The hybrid dynamics feature has become the preferred process for efficient, stable and deep desulfurization of molten iron, and with the continuous improvement of users' requirements for the quality of steel products and the continuous improvement of KR stirring desulfurization technology for molten iron, it has shown a development trend of gradually replacing the injection desulfurization process. [0003] The hot metal KR stirring desulfurization ...

AI Technical Summary

Problems solved by technology

According to the above description, it can be seen that the use of refractory anchor bricks as the stirring blade core realizes the same material of the stirring blade, completely avoids the internal stress problem caused by the different materials of the conventional stirring blade metal core and the refractory lining, and can achieve a large delay in theory. The purpose of the thermal stress damage process of the stirring blade, but how to ensure the reliable connection between the refractory anchor brick and the stirring metal shaft, and continuously and stably withstand the strong stirring force of the stirring blade and the impact force of the molten iron during the high temperature stirring process, so as to avoid sudden damage to the stirring blade The hidden dangers of equipment safety need to be further studied and verified in industrial tests; at the same time, due to the use of non-standard refractory anchor bricks, a small amount of customized anchor bricks has a long processing period and high cost, which restricts the industrialization of this technology This is also the main reason why the patented technology has not been reported on industrial tests and application effects so far.

[0008] To sum up, domestic efforts have been carried out to effectively reduce the internal stress damage caused by the difference in physical and chemical properties of different materials for mixing blades with simple preparation, solid and reliable combination of refractory lining and metal core composite structure. Research, some research results have achieved good application effects in actual production in terms of prolonging the service life of the agitator, reducing online maintenance and repair, and reducing the production cost of molten iron KR stirring desulfurization, but in further preventing the internal stress crack damage of the stirring blade , Reliable preparation of the agitator, continuous and stable use effect, avoiding potential safety hazards, and prolonging the service life of the agitator still have a lot of research space, especially the structure of the metal agitating core will directly affect the temperature and stress distribution of the agitating blade under service conditions Crack damage caused by law and local stress concentration

Images