C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
39/110, 53/360,
C21C 7/10 (2006.01) C22B 9/04 (2006.01)
Patent
CA 2009923
A process for the vacuum processing of metals, in particular steel, in which molten metal is located in a vacuum processing vessel that is closed off by means of a cover. The surface of the liquid metal is separated into a circular sector and an enclosing annular sector. The liquid metal is exposed to various partial vacuums at its surface. The annular sector is acted upon by a smaller partial vacuum than the circular sector, and the separation of the sectors is undertaken in the annular sector to a submersion depth into the melting bath between 10-20 cm. In addition, there is provided apparatus for vacuum processing of metals comprising a skirt that is of simple design, and relatively small and light, arranged on the cover of a vacuum processing vessel in which a ladle is located. The diameter of the skirt is only slightly smaller than the diameter of the ladle at the level of immersion. The lower, open edge of the skirt is immersed into the molten metal of the ladle for only a short distance. This immersion of the skirt results in two sectors in the surface of the melting bath, one being annular and one being circular, and these two sectors are then acted upon by partial vacuums of different intensities created in a connected multi-stage vacuum system.
Fetherstonhaugh & Co.
Mannesmann Aktiengesellschaft
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