Molten iron desulfurization device and method

Abstract

The invention relates to the technical field of molten iron desulfurization, in particular to a molten iron desulfurization device and a molten iron desulfurization method. The method is characterized in that in a mechanical stirring method, high-temperature magnesium steam is used as a carrier gas brought into a desulfurizing agent, and the powder-gas ratio of the desulfurizing agent to the carrier gas is 2-10 kg / L. The device comprises a rack, a lifting platform, a lifting mechanism, a rotary driving device and a stirring spray gun, wherein the lifting mechanism comprises four ball screws; nuts are connected with the lifting platform; and four lifting motors are synchronously controlled by a PLC (programmable logic controller) control system. Compared with the prior art, the method and the device have the beneficial effects that (1) the high-temperature magnesium steam is used as the carrier gas brought into the desulfurizing agent, so that the defect of temperature drop is avoided, and the removal rate of sulfur in molten iron is increased; (2) a ball screw lifting structure is adopted, so that the lifting structure is simplified and the space ratio of the device is reduced; (3) multiple sets of electromagnetic chucks are used for reinforcement, so that the operation is simple and reliable; and (4) the movement track and the suspension time of the desulfurizing agent are prolonged due to composite structure blades, and consumption of the desulfurizing agent is reduced.

Description

technical field [0001] The invention relates to the technical field of external desulfurization of molten iron before converter steelmaking, in particular to a device and method for desulfurizing molten iron. Background technique [0002] Mechanical agitation desulfurization of molten iron is through the rotation and agitation of the agitator inserted into the molten iron in the molten iron tank, so that the molten iron and desulfurizer are mixed and contacted for desulfurization. There are mainly Rhine method and KR (Kambara Reactor) method. These two methods both use vertical paddles. The essential difference is that the depth of insertion into molten iron is different. However, the KR stirring method is widely used because of its higher desulfurization efficiency. The disadvantage of this method is that the clumsy stirring spray gun requires very complicated supports. The rack takes up a lot of operating space, and nitrogen, argon and other carrier gases are used to bring...

AI Technical Summary

Problems solved by technology

The disadvantage of this scheme is that the operation is complicated, and the stirring depth needs to be constantly adjusted for the desulfurization of the bottom layer of molten iron. At the same time, the endothermic reaction of the desulfurizer is not conducive to the thermodynamic conditions of desulfurization due to the use of nitrogen injection to bring in the desulfurizer.

The disadvantage of this scheme is that the structure is quite complicated, and the actual desulfurization method still uses the traditional process, and the desulfurization efficiency and desulfurization agent utilization rate of the molten iron at the bottom of the molten iron tank are low

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