Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1990-05-25
1992-06-16
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C22B 400
Patent
active
051221810
ABSTRACT:
A process and apparatus for melting contaminated metalliferous scrap material are disclosed. The process comprises introducing the contaminated material into a melting furnace, heating the material by means of a plasma at a temperature below the melting point of the metal at which the non-metallic contaminants are volatilized in an atmosphere which is preferably inert or has low reactivity with the metal under the process conditions while displacing at least some of the material within the furnace interior, withdrawing volatile contaminants from the furnace, increasing the temperature in the furnace preferably while maintaining an atmosphere of low reactivity in the furnace in order to melt the metal while preferably displacing at least some of the material in the furnace interior, and removing molten metal from the furnace. The process allows scrap material to be melted with good metal recovery without the need for separate decontaminating apparatus. The process can also avoid the need to shred the scrap and to add large amounts of fluxing salts to separate the molten metal from remaining dross. A rotary furnace heated by means of a continued arc plasma torch is preferably employed in the apparatus which also preferably comprises an incinerator for oxidizing the volatile contaminants withdrawn from the furnace.
REFERENCES:
patent: 2302981 (1942-11-01), Stern
patent: 3322529 (1967-05-01), Pollock
patent: 4133635 (1979-01-01), Fellnor et al.
patent: 4571258 (1986-02-01), Bamji et al.
patent: 4877448 (1989-10-01), Lindsay
patent: 4959100 (1990-09-01), Dube
patent: 4960460 (1990-10-01), Dube
patent: 4997476 (1991-03-01), Linsay
"Indirect and Special Arc Furnaces", (author unidentified), Electric Melting Practice, (Hallstead Press Division, New York, pp. 99-114).
D. R. MacRae, "Plasma Arc Process Systems, Reactors and Applications," Plasma Chem. and Plasma Processing, vol. 9, No. 1 (pp. 85S-118S).
Dube Claude
Dube Ghyslaine
Stevens Wesley
Alcan International Limited
Rosenberg Peter D.
LandOfFree
Process and apparatus for melting contaminated metalliferrous sc does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and apparatus for melting contaminated metalliferrous sc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and apparatus for melting contaminated metalliferrous sc will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1751246