Molten iron desulfurizing method and desulfurizing device thereof

Abstract

The invention relates to a molten iron desulfurizing method and a desulfurizing device thereof. The molten iron desulfurizing method includes pouring processing molten iron into an inner cavity of a desulfurizing device; adding a lime and fluorite compound desulfurizer constantly; blowing argon to stir the molten iron through an air inlet of the desulfurizing device, and removing sulfur in the molten iron; and discharging desulfurizing slag constantly from a slag discharging groove, and discharging the desulfurized molten iron through an iron discharging nozzle, wherein the S content in the desulfurized molten iron is 0.041 to 0.057. The desulfurizing device is provided with a tank casing with trunnion iron, and is characterized in that the iron discharging nozzle which inclines upward is arranged on the tank casing, the slag discharging groove which inclines from top to down is arranged at a position opposite to the iron discharging nozzle, fireproofing linings are arranged in the tank casing, the iron discharging nozzle and the slag discharging groove, an air inlet is arranged at the bottom, and the slag discharging groove at the upper end of the slag discharging groove is higher or 20cm higher than the front end of the iron discharging nozzle. According to the molten iron desulfurizing method and the desulfurizing device thereof, molten iron desulfurizing efficiency is improved, and the amount of the desulfurized molten iron can reach 15-25t / h.

Description

technical field [0001] The invention relates to a molten iron desulfurization method and a desulfurization device thereof. Background technique [0002] When producing molten iron in the shaft furnace smelting device, the iron is tapped using the long-flow method of molten iron, and because the shaft furnace processes waste iron and steel resources, the sulfur content of the molten iron is as high as 0.1%-0.3%, which cannot be directly used for steelmaking. Therefore, high-sulfur molten iron must be pretreated for desulfurization. The existing pretreatment tank cannot be used for online continuous desulfurization. The existing desulfurization method is to spray the molten iron with desulfurizer in the pretreatment tank and use mechanical stirring to realize the desulfurization of the molten iron. It cannot be continuously desulfurized online. For a part of iron, desulfurizer is added after slag removal, and then part of iron is extracted, and when desulfurization is sprayed...

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Problems solved by technology

The existing pretreatment tank cannot be used for online continuous desulfurization. The existing desulfurization method is to spray the molten iron with desulfurizer in the pretreatment tank and use mechanical stirring to realize the desulfurization of the molten iron. It cannot be continuously desulfurized online. For a part of iron, desulfurizer is added after slag removal, and then part of iron is extracted, and when desulfurization is sprayed with desulfurizer, the molten iron pretreatment tank overflows seriously, reducing the effective volume of the pretreatment tank, and the desulfurization time of the shaft furnace is long, and the consumption of desulfurizer is large ; and the mechanical stirring device used is easy to wear and tear, and the cost of desulfurization is high

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