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

A technology of vacuum refining and single dipping tube, which is applied in the field of molten steel refining outside the furnace, which can solve problems such as deviation, blockage of bottom blowing gas, interruption of refining process, etc., and achieve the effects of improving life, reducing erosion and reducing oxidation

Active Publication Date: 2014-01-22
MAGANG (GROUP) HOLDING CO LTD +1
View PDF9 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Single-dip-pipe vacuum refining device and using method thereof
  • Single-dip-pipe vacuum refining device and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023]The single dipping tube vacuum refining device performs refining according to the following steps:

[0024] (1) When refining molten steel, first lift the ladle to the ladle car, and the ladle car drives into the treatment station of the single-dipping tube vacuum refining device, then insert the dipping tube into the ladle slag, vacuum the slag, and suck as much ladle slag as possible .

[0025] (2) Insert the dipping pipe into the molten steel to a depth of 400mm, open the nozzle valve on the circulation pipe of the dipping pipe, the blowing volume of each nozzle is equal, and the total blowing flow rate is controlled at 13NL / min per ton of steel.

[0026] (3) Vacuumize to reduce the vacuum degree to 73Pa after 3 minutes. Observe the top slag situation of the liquid steel surface in the vacuum chamber through the camera image of the vacuum chamber, and further adjust the total blowing flow rate of the nozzle to 18NL / min per ton of steel.

[0027] (4) After 10 min...

Embodiment 2

[0030] The single dipping tube vacuum refining device performs refining according to the following steps:

[0031] (1) When refining molten steel, first lift the ladle to the ladle car, and the ladle car drives into the treatment station of the single-dipping tube vacuum refining device, then insert the dipping tube into the ladle slag, vacuum the slag, and suck as much ladle slag as possible .

[0032] (2) Insert the dipping pipe into the molten steel to a depth of 400mm, open the nozzle valve on the circulation pipe of the dipping pipe, the blowing volume of each nozzle is equal, and the total blowing flow rate is controlled at 15NL / min per ton of steel.

[0033] (3) Vacuumize to reduce the vacuum degree to 70Pa after 3 minutes. Observe the top slag situation of the liquid steel surface in the vacuum chamber through the camera image of the vacuum chamber, and further adjust the total blowing flow rate of the nozzle to 20NL / min per ton of steel.

[0034] (4) After 11 mi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/10C21C7/068
CPCC21C7/068C21C7/064C21C7/10
Inventor 乌力平沈昶胡玉畅潘远望谢世红
Owner MAGANG (GROUP) HOLDING CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap