Device and method for desulfurization of molten iron by composite blowing and stirring

Abstract

The invention belongs to the technical field of iron and steel metallurgy, and discloses a device and method for desulfurization of molten iron by composite blowing and stirring. The device comprisesa lifting device and a rotary driving device, wherein the lifting device is connected to a spray gun body through a lifting part; the rotary driving device is connected to the spray gun body through arotary driving part; a gun head is cast on the front end of the spray gun body; stirring blades which are uniformly distributed are carried on the periphery of the gun head; and the exterior of molten iron containing the gun head and the stirring blades is wrapped with a molten iron tank shell having a double-layer structure. A desulfurizing agent is loaded into the rotary spray gun by using an inert gas, and meanwhile the spray head carrying the stirring blades is used for mixing and stirring the molten iron mixed with the desulfurizing agent; the desulfurizing agent and the molten iron arefully mixed through the organic combination of a KR method and a blowing process; the device has small temperature drop of molten iron in the whole desulfurization process, low consumption of the desulfurizing agent, and short desulfurization cycle, and realizes the high-efficiency desulfurization; the damage to a stirring head can be reduced; the service life of the stirring head is prolonged; and the desulfurization cost is saved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a desulfurization device and method for composite injection and stirring molten iron. Background technique [0002] Currently, the closest prior art: [0003] The following two methods are mainly used for molten iron pretreatment: injection method and KR method; [0004] The blowing method is to pass the desulfurizer into the molten iron for desulfurization by spraying the nozzle, but it cannot ensure that the desulfurizer is in full contact with the molten iron, the kinetic effect is low, the desulfurization is unstable, and the consumption of the desulfurizer is large, and the raw materials are relatively high. expensive. [0005] The KR method is to immerse the stirrer in the molten iron to a certain depth and make it rotate, so that the added desulfurizer is fully mixed with the molten iron. However, a columnar turning zone will be formed near...

AI Technical Summary

Problems solved by technology

[0008] (1) The existing KR method desulfurization will cause a small part of desulfurization agent to be ineffectively consumed, and the temperature drop of molten iron is large, the amount of slag is large, the iron loss is high, and the desulfurization cycle is long

[0009] (2) The desulfurization kinetic effect of the existing injection method is low, the desulfurization is relatively unstable, and the consumption of desulfurization agent is large

[0010] From the above, it can be known that using the KR stirring method or injection method alone, and using the existing desulfurization equipment at the same time, both have their own shortcomings and cannot achieve a good desulfurization effect.

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