Patent ID: 6607578
Filing Date: 2003-08-19
Classification: C22B

Abstract:
A continuous vacuum refining method of molten metals comprising the steps of:eliminating impurities in a molten metal by evaporation by stirring the molten metal at a molten liquid stirring part in a vacuum chamber that has been previously evacuated and heated; feeding the molten liquid into a molten liquid tapping part in the vacuum chamber from the molten liquid stirring part through a connecting hole; and continuously discharging the molten liquid into a vessel in the evacuated refined molten liquid recovery chamber connected to a recovery passageway through the recovery passageway connected to the molten liquid tapping part for recovering the refined molten metal after returning the pressure to an atmospheric pressure, wherein a plurality of the recovery passageways and a plurality of the refined molten liquid recovery chambers connected to respective recovery passageways are provided, and the refined molten liquid recovery chambers for discharging the molten liquid through the recovery passageway are alternately switched.