A pre-deoxidation device for injecting carbon powder in the converter tapping hole and its application method

Abstract

The invention discloses a pre-deoxidation device capable of jetting carbon powder in a tap hole of a converter and a use method of the pre-deoxidation device. The pre-deoxidation device comprises a base and the converter; the converter comprises a converter bottom, a converter body, a converter shell, a converter lining and the tap hole; the base is symmetrically and fixedly connected with two support faceplates; sides, far away from each other, of the two support faceplates are separately provided with a servo motor and a speed reducer through a supporting seat; each of the two speed reducersis rotatably connected with an input shaft and an output shaft; and one end, far away from the corresponding speed reducer, of each input shaft is fixed onto the corresponding servo motor. The pre-deoxidation device disclosed by the invention has the advantages that the carbon powder is blown into the converter through the tap hole in a manner of wind blowing, which is convenient for the carbon powder to be fully contacted with molten steel in the converter, and thus, the carbon powder is prevented from being stacked, so that carbon powder is dissolved in the molten steel more, and the pre-deoxidation effect is enhanced; a desoxidant does not need to be added in such a process, thereby preventing unnecessary impurities from being produced, and reducing unnecessary subsequent operation.

Description

technical field [0001] The invention relates to the technical field of converter deoxidation, in particular to a pre-deoxidation device for injecting carbon powder in a converter tap hole and a method for using the same. Background technique [0002] The converter belongs to a kind of steelmaking furnace. It uses molten iron, scrap steel, and ferroalloy as the main raw materials. The steelmaking process is completed in the converter by the physical heat of the molten iron itself and the chemical reaction between the components of the molten iron to generate heat without the aid of external energy. . [0003] The converter steelmaking process needs to increase the oxygen supply for oxidative dephosphorization. After the oxidative dephosphorization is completed, the molten steel will be rich in oxygen, and the molten steel needs to be deoxidized. Currently, there are two ways to deoxidize the molten steel; [0004] (1) Add a deoxidizer, the deoxidizer is generally a substance...

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Problems solved by technology

[0004] (1) Add a deoxidizer, the deoxidizer is generally a substance containing Al, Si, Mn, Ca, Mg, which has a strong deoxidation ability, but there are certain shortcomings in this method: these deoxidizers will generate Al2O3 after reacting with oxygen , SiO2, MnO, CaO, MgO and other impurities, these inclusions are very harmful to the steel and need to be removed through subsequent argon blowing or refining processes, longer time argon blowing and refining will increase production costs;

[0005] (2) Add part of carbon powder to the ladle for pre-deoxidation before tapping the converter, and add aluminum-type strong deoxidizer to the ladle for deep deoxidation in the later stage of the tapping process of the converter, and add alloys to adjust the composition of molten steel, but This method has some disadvantages: the density of carbon powder is small, and after being added to the ladle, most of the carbon powder is easy to accumulate together, and some carbon powder is not dissolved into the molten steel, which makes the pre-deoxidation effect poor

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