Device and method for quickly removing occluded foreign substances in molten steel

Abstract

The invention discloses a device and a method for quickly removing occluded foreign substances in molten steel, and relates to the field of production of a high-quality steel product. The basic principle is that high-purity argon is blown at the bottom of a molten steel container; a certain amount of specific ventilating elements are arranged according to the demands; a lot of tiny bubble areas are generated in the molten steel which is primarily melted or refined; the molten steel is subjected to purification treatment; the occluded foreign substances in the molten steel are efficiently and quickly promoted to enter inside top residue to be removed in catching and rising manners. The device is composed of a container (steel ladle or tundish) (1) of containing the molten steel, a plurality of specific conical bottom blowing elements (2), a guard brick (6), a bottom blowing gas adjusting system (7) and the like. The device has the advantages of being large in dispersed bubble coverage area of bottom air supply in the molten steel, fast in removal rate of the occluded foreign substances, and high in gas utilization rate; a specific air supply element has the convertibility and the like; the refining requirements of high-quality steel can be met.

Description

Technical field [0001] The invention belongs to the technical field of steelmaking equipment, and in particular relates to a device and method for quickly removing inclusions in molten steel, and a refining device and method for quickly removing inclusions in molten steel. The device and method quickly remove inclusions in molten steel. Efficient and suitable for high-quality steel production. Background technique [0002] The size, quantity, distribution and type of inclusions in molten steel have a great influence on the quality of steel. Minimizing the number of various inclusions in molten steel has become one of the important directions for improving the quality of molten steel. At present, the methods and devices of molten steel refining at home and abroad mainly include ordinary ladle bottom argon blowing, CAS / CAS-OB refining furnace, LF ladle refining furnace, RH vacuum circulation refining furnace, VD / VOD vacuum refining furnace, etc. These traditional refining furnaces ...

AI Technical Summary

Problems solved by technology

In conventional refining devices such as ladle bottom blowing argon, CAS-OB refining device, LF refining furnace, VD / VOD vacuum refining, etc., the stirring movement of molten steel depends on bottom blowing argon, and single or double bottom blowing gas supply components are generally used. In order to prevent For secondary oxidation, generally the bottom blowing argon gas flow rate is relatively small, the bottom blowing gas supply element is single, the bubble diameter is relatively large and the number is small, and the bubble coverage area in the ladle is relatively small, so the inclusions in the molten steel, especially small inclusions, are more likely to be captured by the bubbles Smaller, some of the inclusions brought to the top slag or refractory surface by air bubbles and molten steel flow are easily rolled back into the interior of molten steel due to the action of liquid flow, making the removal rate and efficiency of inclusions in molten steel relatively low

In order to obtain a better effect of removing inclusions, most refining devices and production processes rely on weak stirring or slow circulation of molten steel to remove inclusions in molten steel to the slag layer on the surface of molten steel, which makes the refining time very long and the temperature of molten steel drops. Larger, smelting cost and production rhythm are greatly affected

With the substantial increase in the demand for high-quality steel in modern industry and high-speed trains, ocean-going ships, and air transportation, the current traditional devices and methods for producing steel with ultra-low inclusion content can no longer meet the growing demand in terms of output and quality. market needs

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