Single-dip-pipe vacuum refining device and using method thereof

Abstract

The invention discloses a single-dip-pipe vacuum refining device, which comprises a vacuum chamber and a dip pipe, wherein the dip pipe is inserted into molten steel in a ladle during vacuum refining. The device is characterized in that blow nozzles are arranged hierarchically at the circumference of the single dip pipe, the nozzles on the same layer are arranged in groups and controlled independently, and argon gas is blown into the dip pipe through the blow nozzles on the inner wall of the dip pipe. During vacuum refining, by increasing the blowing capacity of the nozzles on the dip pipe, molten steel form a circular flow rising along the periphery of the vacuum chamber and falling along the center of the vacuum chamber to achieve deep decarbonization and deep devulcanization in vacuum. By adopting the device, the molten steel circulating manner of an existing vacuum refining device is changed, so that the problem that the refining process is interrupted because a ladle bottom blowing brick is clogged or bottom blowing gas deviates from a dip pipe due to steel flow disorder is overcome, meanwhile, the corrosion of refractory materials in the vacuum chamber is also alleviated, and the refining cost is also reduced.

Description

technical field [0001] The invention belongs to the field of molten steel refining outside the furnace, in particular to a vacuum refining device for simultaneously producing ultra-low carbon and ultra-low sulfur steel. Background technique [0002] At present, the out-of-furnace refining method for industrial-scale production of ultra-low carbon and ultra-low sulfur steel mainly adopts RH vacuum refining. The main problems in the process of using RH vacuum refining to produce ultra-low carbon and ultra-low sulfur steel at the same time are as follows: First, the RH furnace is composed of two dipping tubes, rising and falling. The time is long, the dipping tube has serious nodules, and the life of the dipping tube is short. The second is that the RH furnace is composed of two dipping tubes that rise and fall. The inner diameter of the dipping tube is small and the steel slag interface is small. reach below 30%. In addition, because the desulfurizer used in it contains up t...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems existing in the prior art, the object of the present invention is to provide a vacuum refining device with a single dip tube, which changes the molten steel circulation mode of the existing vacuum refining device, and overcomes the blockage of the ladle bottom blowing brick or the disorder of the steel flow. The problem of interruption of the refining process caused by the bottom blowing gas deviating from the single dip tube also reduces the problem of corrosion of the vacuum chamber refractory material and reduces the cost of refining

Images