Patent ID: 7976773
Filing Date: 2011-07-12
Classification: C21C

Abstract:
1. A vacuum degassing apparatus for removing impurity gases from molten steel by backflow of molten steel thereby homogenizing molten steel composition, comprising: duplex vacuum vessels of first and second vacuum vessels fixedly arranged at a predetermined interval to a floor which is provided horizontally at a predetermined height from a bottom, wherein the first and second vacuum vessels are arranged to communicate with first and second gas coolers, respectively; first and second ladle carriages arranged to run on first and second rails, respectively, to reciprocate between a treatment position directly under the first and second vacuum vessels and a tapping position where refined molten steel is tapped, each of the first and second ladle carriage loaded with a corresponding one of first and second ladles; first and second lifting cylinders each for raising and lowering each of the first and second ladles in the treatment position so that a bottom end of each of the first and second vacuum vessels is immersed by molten steel in each of the first and second ladles, whereby a continuous vacuum degassing refining process is enabled; first and second exhaust ducts extending respectively from the first and second gas coolers; vacuum duct extending from vacuum equipment and arranged between the first and second exhaust ducts; and switching duct configured to reciprocate between the first exhaust duct and the vacuum duct and between the second exhaust duct and the vacuum duct.