Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Reexamination Certificate
2006-05-02
2006-05-02
Kastler, Scott (Department: 1742)
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
C075S503000
Reexamination Certificate
active
07037356
ABSTRACT:
The present invention provides a method of operation and a facility for the same suppressing the generation of dioxins in the combustion exhaust gas and efficiently reclaiming heat from high temperature combustion exhaust gas when firing and reducing fines of chromium ore, iron ore, or other ore or pellets formed from dust sludge, etc. containing iron oxide or other metal oxides generated in the metal industry in a reducing rotary hearth furnace. This treats the combustion gas generated in the reducing rotary hearth furnace to make the temperature of the gas 800° C. or higher for at least a certain time, to make the concentration of the carbon monoxide not more than 200 ppm in terms of volume ratio and to achieve a sufficiently well developed turbulent state at least at one of the inside of the exhaust gas outlet duct and the vicinity of the exhaust gas outlet duct for at least a certain time, then rapidly cooling the gas. Further, it controls the total number of moles of zinc and lead, the total number of moles of alkali metals, and the total number of moles of halogen elements contained in the combustion exhaust gas to a predetermined ratio.
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English language translation of Japanese 11-342314, Koji et al, Dec. 14, 1999.
“Aufarbeitung Von Reststoffen Aus 1 Der Stahlindustrie,” Stahl Und Eisen, Verlag Stahleisen GMBH., Dusseldorf, DE, vol. 112, No. 8, p. 83-86, no date.
Ibaraki Tetuharu
Oda Hiroshi
Takahashi Masaharu
Baker & Botts LLP
Kastler Scott
Kim Chang Sik
Nippon Steel Corporation
Tejwani Manu J.
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