Vacuum refining method for molten steel by using two-tank single-cover type VD refining furnace

Abstract

The invention discloses a vacuum refining method for molten steel implemented by using a two-tank single-cover type VD refining furnace. The vacuum refining method is characterized in that an operation platform of the refining furnace is erected above a molten steel return linear guide rail, and in the process of steelmaking, double-station alternate cyclular treatment is realized in a pre-vacuumizing mode. The method disclosed by the invention has the advantages that the refining furnace is compact in structure, scientific in layout and small in occupied land, the operation and control for a tank cover is convenient, a vacuumizing system is reasonable in structure, good in operating stability, high in working efficiency, and long in service life, and the efficiency and effect of refining are improved.

Description

technical field [0001] The invention relates to a steel-making VD refining technology, in particular to a method for realizing vacuum refining of molten steel by using a double-tank and single-cover VD refining furnace. Background technique [0002] Steel-making VD refining technology is a process of refining molten steel by using VD furnace to vacuumize. VD Furnace aka VD steel Including refining furnace, it can realize argon blowing, oxygen blowing, decarbonization , Vacuum degassing, fine-tuning of alloy composition under vacuum and other operations; general vacuum degassing treatment and fine-tuning of alloy composition under vacuum can be performed on molten steel. Its working process generally includes opening the vacuum tank cover and hoisting it into the ladle, connecting the argon blowing device to blow argon, measuring temperature and sampling, covering the vacuum tank cover and vacuuming for processing (oxygen blowing if necessary), and opening the vacuum tank ...

AI Technical Summary

Problems solved by technology

[0005] However, this existing double-station VD furnace technology still has the following defects: 1. The overall structural layout of the VD furnace is unscientific, which is not conducive to manipulation and occupies a large space

2. The structure of the tank cover truck is relatively simple, which is not conducive to the operation of closing and opening the tank cover

3. The vacuum system is a wet vacuum system using a steam jet pump, but the structure is too complicated, which is not conducive to manipulation, and the sewage treatment system occupies a large area

4. High requirements for steam and high energy consumption of the system

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