C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
C22B 9/20 (2006.01) C21B 13/02 (2006.01) C21C 5/52 (2006.01) C21C 5/56 (2006.01) C22B 9/21 (2006.01) F27B 1/02 (2006.01) F27B 3/08 (2006.01)
Patent
CA 2147972
ABSTRACT OF THE DISCLOSURE The invention relates to a process and an apparatus for the melting down of scrap in a closed shaft furnace operated with direct current. In accordance with the process of the invention, the scrap is charged in the form of an annular surface at the furnace head ring, heating gases flowing in opposite direction to the descending scrap are drawn off below the scrap feed from the cylinder outer wall of the column of scrap, the inner free surface of the annular flat cross section is reduced before the scrap reaches the melt zone, and the scrap is subjected, in the melt zone, to the arc in the center of the flat cross section. The arc furnace is so developed that the cathode (21) is held by an electrode support device (30) which is developed as pipe (31) arranged concentric to the center line (I) of the vessel, that the pipe (31) has a conical taper (34) at its head end; that the pipe (31) rests at its root end, via support arms (32), against the shaft (11), and that a flue-gas duct (19) is provided at the head of the shaft furnace (10) surrounding the shaft (11). Fig. 1
Fetherstonhaugh & Co.
Mannesmann Ag
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