A deoxidizer for purifying molten steel by rotary jetting and its application method

Abstract

The invention relates to a deoxidizer for rotary injection purification of molten steel and a method for using the deoxidizer. The deoxidizer is prepared by mixing aluminum powder, calcium oxide and calcium carbonate. The use method comprises the following steps: 1) after the converter tapping, a ladle enters a deoxidizer injection station; an injection gun is inserted into molten steel 300-500mmaway from the bottom of the ladle for injection; 1.5-2.2 kg / ton steel is added for deoxidizer injection; 2) after all the deoxidizers are added into the molten steel, the deoxidizing process is finished, the ladle is weakly blown with argon for 3 to 5 minutes, and then the molten steel is transfer to the next process. The prepared deoxidizer powder is injected into the molten steel through the injection gun, the problem that the powder has difficulty in entering the molten steel is solved, and the problem that the deoxidizing product is difficult to remove is solved through reasonable composition proportioning of the deoxidizer, the smelting time is short, and the operation is simple and easy.

Description

technical field [0001] The invention relates to the technical field of steelmaking, in particular to a deoxidizer for purifying molten steel by rotary jetting and a using method thereof. Background technique [0002] The deoxidation process runs through the whole process of steelmaking, and the way of deoxidation of molten steel determines the final quality of steel. The conventional deoxidation process is generally precipitation deoxidation, using deoxidizers such as aluminum and silico-manganese to achieve oxygen removal. However, silicon-manganese deoxidation is incomplete, and aluminum deoxidation is difficult to remove inclusions after deoxidation, especially for some ultra-low carbon steels (such as IF steel, etc.). [0003] When aluminum-iron deoxidizer is used, the amount of aluminum used per ton of molten steel is 800-1200g. During the deoxidation process of aluminum and iron, if the density of aluminum and iron is low, it will float to the surface of molten steel...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a deoxidizer for purifying molten steel by rotary blowing and its use method. The prepared deoxidizer powder is sprayed into the molten steel through a spray gun, which not only solves the problem that the powder is difficult to enter the molten steel, but also makes the deoxidizer more reasonable. The composition ratio solves the problem that the deoxidation product is difficult to remove, and the smelting time is simple and easy to operate