Device and method for treating molten steel in tundish by utilizing rare earth

Abstract

The invention relates to a device and a method for treating molten steel in a tundish by utilizing rare earth. The device comprises a tundish body, a cylindrical reactor and a powder spraying device,wherein the cylindrical reactor is positioned at the central position of the tundish body; a ventilation hole is formed in the central position of the bottom of the cylindrical reactor; a ventilationelement is arranged at the central position of the bottom of the cylindrical reactor; the molten steel flows into the cylindrical reactor through a ladle long nozzle and is fully mixed with rare earthpowder; and after reaction, the molten steel flows into the tundish body from the upper edge of the cylindrical reactor. The molten steel is treated by adopting the device, the carried rare earth powder is blown into the molten steel through the ventilation element at the bottom of the tundish by utilizing inert gas, the rare earth powder and the molten steel are mixed in the cylindrical reactorwith a small volume, the uniformity degree of the rare earth powder and the molten steel is improved by the stirring effect of the gas, the dynamic condition of metallurgical reaction is improved, theyield and utilization rate of the rare earth powder are improved, and the device has the advantages of simple equipment, convenience in operation and the like.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and in particular relates to a device and method for treating molten steel with rare earth in a tundish. Background technique [0002] Rare earth is the general name of seventeen metal elements including lanthanides, scandium and yttrium in the chemical periodic table. The unique extranuclear electronic structure of rare earth elements makes them active, reducible and unique in optical, electrical and magnetic properties. being widely used. Rare earth elements are also of great significance in the metallurgical industry. [0003] Adding rare earth elements or rare earth metal oxides in molten steel can not only fine-tune the composition, but also change the structure and shape of metal crystals, improve the surface quality of the slab, improve the inhomogeneity of the microstructure, and refine the grains. Obtain a dense structure, improve the strength and toughness of steel; improve...

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Problems solved by technology

[0006] The ladle pressing method is simple to operate, and the rare earth components are evenly distributed in the molten steel, but the recovery rate is low, and the inclusions are not completely deteriorated; the ladle spraying powder method can obtain better dynamic conditions and promote the mixing of rare earth elements and molten steel. But the operation is complicated; the ladle feeding rare earth wire method is simple to operate and purifies the molten steel, but there are also defects such as low recovery rate of rare earth elements and incomplete deterioration of inclusions; the tundish feeding rare earth wire method is simple to operate, and the rare earth elements are distributed in the molten steel Uniformity and high utilization rate, complete deterioration of inclusions, and improved cleanliness of molten steel, but there are problems such as nozzle nodulation, rare earth wire burning, and reaction with molten covering agent that affect the physical and chemical properties of the covering agent; Although the rare earth wire method does not have the problem of nodulation at the nozzle, the volume of the mold is small and in the cooling state, the rare earth elements cannot be fully diffused, resulting in uneven distribution, and the rare earth inclusions formed by the reaction with the molten steel components have no time to float to the mold powder. And it is trapped in the molten steel, thus affecting the quality of the cast slab

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