Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Reexamination Certificate
2007-02-13
2007-02-13
King, Roy (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
C075S324000
Reexamination Certificate
active
10438013
ABSTRACT:
A method of producing stainless steel includes the steps of melting a raw material in an electric furnace to form molten steel, and then refining the molten steel by a refining furnace to produce stainless steel in a stainless steel producing process. In the method, a carbonaceous reducing agent is added to a zinc-containing waste material produced in the stainless steel producing process, the resultant mixture is agglomerated by a briquette press to form agglomerates incorporated with a carbonaceous material, the agglomerates incorporated with the carbonaceous material are heated in a rotary hearth furnace to reduce and evaporate zinc to form dezincified agglomerates, and then the dezincified agglomerates are charged as a coolant in an oxidation period of the refining furnace.
REFERENCES:
patent: 4416688 (1983-11-01), Greenwalt
patent: 4673431 (1987-06-01), Bricmont
patent: 5567224 (1996-10-01), Kundrat
patent: 5885521 (1999-03-01), Meissner et al.
patent: 5989019 (1999-11-01), Nishimura et al.
patent: 6063156 (2000-05-01), Negami et al.
patent: 6129777 (2000-10-01), Fuji et al.
patent: 6149709 (2000-11-01), Uragami et al.
patent: 6152983 (2000-11-01), Kamijo et al.
patent: 6238453 (2001-05-01), Rose et al.
patent: 6241803 (2001-06-01), Fuji
patent: 6251161 (2001-06-01), Tateishi et al.
patent: 6254665 (2001-07-01), Matsushita et al.
patent: 6258149 (2001-07-01), Sugiyama et al.
patent: 6296479 (2001-10-01), Nishimura et al.
patent: 6302938 (2001-10-01), Kamijo et al.
patent: 6319302 (2001-11-01), Harada
patent: 6334883 (2002-01-01), Takenaka et al.
patent: 6368379 (2002-04-01), Tateishi et al.
patent: 6413295 (2002-07-01), Meissner et al.
patent: 6500381 (2002-12-01), Harada
patent: 6503289 (2003-01-01), Tanigaki et al.
patent: 6511316 (2003-01-01), Harada et al.
patent: 6517770 (2003-02-01), Tateishi et al.
patent: 6521171 (2003-02-01), Tateishi et al.
patent: 6569223 (2003-05-01), Tanigaki et al.
patent: 0 275 863 (1988-07-01), None
patent: 56-93834 (1981-07-01), None
patent: 9-209047 (1997-08-01), None
J. K. Pargeter, et al., Conservation & Recycling, vol. 8, No. 3/4, XP-002254917, pp. 363-375, “Operating Experience at Inmetco and Application of the Process to the Production of DRI”, 1985.
K. Grebe, et al., Stahl U. Eisen, Metallurgie, vol. 110, No. 7, XP-000161339, pp. 99-106, and 203, “The Metallurgy of Direct Reduction of Metallurgical Wastes According to the Inmetco Process”, Jul. 13, 1990 (with partial English translation), read partial translation only.
K.-H. Bauer, et al., Stahl U. Eisen, Metallurgie, vol. 110, No. 7, XP-000161338, pp. 89-96, and 202, “Recycling of Metallurgical Wastes According to the Inmetco Direct Reduction Process”, Jul. 13, 1990 (with partial English translation), read partial translation only.
J. K. Pargeter, et al., 44thElectric Arc Furnace Conf., XP-002254918, pp. 403-408, “Recycling of Waste and Flue Dust from the Steel Industry into Hot Metal, Using the Inmetco Process”, 1986.
R. H. Hanewald, et al., Iron and Steel Engineer, vol. 62, No. 3, XP-002106296, pp. 62-67, “Recovery of Metals from Steel Wastes and Production of DRI by the Inmetco Process”, Mar. 1985.
S. Barozzi, et al., Steel Times, Fuel & Metallurgical Journals, vol. 225, No. 5, XP-000692297, pp. 191-192, “Metal Recovery from Steel Wastes by the Inmetco Process”, May 1, 1997.
J. L. Roth, et al., La Revue de Metallurgie-CIT, vol. 98, No. 11, XP-001101771, pp. 987-996, “Primus, A New Process for Recycling By-Products and Producing Virgin Iron”, Nov. 2001.
T. Hansmann, et al., Stahl U. Eisen, Metallurgie, Recycling, vol. 120, No. 11, XP-000977725, pp. 49-53, “Primus-Ein Neues Verfahren Für Das Recycling Von Hüttenwerksreststoffen und die Eisenerzreduktion”, Nov. 15, 2000.
R. Deike, et al., Stahl U. Eisen, Metallurgie, vol. 119, No. 2, XP-000802518, pp. 53-58, and 121, “Behaviour of Zinc During the Recycling of Iron-Containing Dusts and Sludges”, Feb. 16, 1999 (with partial English translation).
J. A. Philipp, et al., Stahl U. Eisen , Umweltschutz and Ergonomie, vol. 112, No. 12, XP-002254916, pp. 75-86, “Recycling In Der Stahlindustrie”, Dec. 14, 1992.
Miyahara Itsuo
Sugitatsu Hiroshi
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