Flat single-tube vacuum refining device

Abstract

The invention relates to a flat single-tube vacuum refining device, belongs to molten alloy treatment, and especially relates to external refining of molten steel. The device comprises a dip tube, a ladle and a buggy ladle. The dip tube consists of an upper vacuum chamber and a melting chamber. A top lance, a vacuum pumping mechanism and a charging mechanism are installed on the dip tube. And the bottom of the ladle is provided with a permeable brick. The device is characterized in that the dip tube has a flat bottom, an approximately elliptic cross section, and two long side walls connected with two short side walls straightly and parallelly, also the arc of the ellipse is concentric with the ladle, the long axis of the ellipse is over a diameter line of the ladle, and a temperature measuring and sampling area forms between the long side walls and the inner wall of the ladle, a temperature measuring and sampling mechanism is arranged deeply in the area, the bottom argon blowing permeable brick is disposed eccentrically, and an air vent of the brick is positioned right below the dip tube. With the advantages of novel conception, simplified and compact structure, easy manufacturing, low cost, convenient operation, the device of the invention improves the stability and reliability of refining, enhances the decarbonization speed, and strengthens decarbonization stability. Being convenient for temperature measuring and sampling, the device provided in the invention ensures a smooth production process, and is beneficial to improve steel quality and lower production cost.

Description

technical field [0001] The invention belongs to the treatment of molten metal alloys, in particular to a refining device outside a molten steel furnace. Background technique [0002] To produce high-quality steel with high cleanliness, it is necessary to refine molten steel outside the furnace. At present, the RH vacuum circulation refining device is mostly used. The lower part of the vacuum chamber of the device is equipped with two dipping tubes connected to it, namely the rising tube and the downcomer. During vacuum refining, the dipping tube is inserted into the molten steel, and the pressure difference of the vacuum chamber makes the molten steel enter the vacuum chamber from the dipping tube, and at the same time, the driving gas, usually argon, is blown in from the rising tube, and it is pumped by the principle of a bubble pump. The molten steel is circulated through the vacuum chamber and the downcomer, and its basic functions are degassing, decarburization, deoxida...

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Problems solved by technology

[0004] In order to overcome the defects existing in the prior art, the purpose of the present invention is to provide a flat single-tube vacuum refining device to solve the problem of unstable decarburization rate caused by the large disturbance of the circulating liquid steel to the bubble rising path of the bottom blowing gas of the ladle during the vacuum refining process , The small circulation path of molten steel leads to low decarburization rate and the difficulty of temperature measurement and sampling during the vacuum refining process, so as to improve the adaptability and reliability of the single nozzle vacuum refining furnace and ensure the smooth production

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