Jet stirrer for mechanical stirring and desulfurizing of molten iron

Abstract

The invention discloses a jet stirrer for mechanical stirring and desulfurizing of molten iron. The jet stirrer comprises a rotating shaft and stirring blades arranged at the lower end of the rotating shaft and uniformly distributed along the circumferential direction of the rotating shaft, wherein the rotating shaft consists of a metal hollow shaft and a refractory material working lining compounded on the outer side of the metal hollow shaft; an air cooling pipe is arranged in the cavity of the metal hollow shaft; the lower end of the rotating shaft is provided with a jet channel communicated with the air cooling pipe; and the jet channel is positioned between adjacent stirring blades. In the jet stirrer, cooling gas is jetted from a puff port into a stirring center vortex to drive a desulfurizer in a forced vortex area of a stirring center to move relative to molten iron, so that the mixing and dispersing of the desulfurizer in the forced vortex area of the stirring center in the molten iron is realized, and the desulfurizing reaction dynamic condition in the area is improved. Meanwhile, the retention and bonding of desulfuration residues between adjacent blades can be restrained, the effective acting areas of the stirring blades are increased, the dry slag cleaning and maintaining amount of the stirrer is reduced, and the mechanical stirring and desulfurizing production capacity of the molten iron and the utilization ratio of the desulfurizer are increased.

Description

technical field [0001] The invention relates to a mechanical stirring desulfurization stirring device outside a molten iron furnace before converter steelmaking, in particular to a jet type agitator for mechanical stirring desulfurization of molten iron. Background technique [0002] The KR (Kambara Reactor) stirring desulfurization method is a desulfurization technology outside the molten iron furnace that Nippon Steel began to study in 1963 and applied to industrial production in 1965. This desulfurization method uses a cross-shaped blade structure agitator lined with refractory material to be immersed in the molten iron tank for rotation, stirring the molten iron to create a vortex, and at the same time the weighed desulfurizer is added to the surface of the molten iron by the feeder. It is drawn into the molten iron by the vortex, mixes and reacts with the high-temperature molten iron to achieve the purpose of desulfurization. The desulfurization method realizes the cyc...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a jet-type agitator for mechanical agitation desulfurization of molten iron, which can improve the dynamic conditions of mechanical agitation desulfurization of molten iron without changing the insertion mode of the agitator in the molten iron tank, and solve the problem of the agitation of adjacent stirring blades. Retention and caking of inter-desulfurization slag

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