Chemistry of inorganic compounds – Oxygen or compound thereof – Metal containing
Reexamination Certificate
2005-11-15
2010-06-29
Silverman, Stanley (Department: 1793)
Chemistry of inorganic compounds
Oxygen or compound thereof
Metal containing
Reexamination Certificate
active
07744848
ABSTRACT:
A process of producing magnetite with a high purity of greater than 90% magnetite, more typically greater than 98% magnetite, by reducing powdered hematite into magnetite under maximum temperatures of about 700 to 1300° C. against a counter-current of or concurrent with methane or natural gas in a heating device. The amount of methane used to reduce the hematite may be about 0.18 and 1.8 standard cubic feet of methane per pound of hematite. A product of high purity methane produced from the process is also provided, where the magnetite is below 1 μM in diameter and has a magnetic saturation greater than 90.0 emu/g. Corresponding apparatus using an improved feeder system for powdered hematite is provided.
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Nickels Dale L.
Sawayda Michael E.
Weyand Thomas E.
Abeles, Esq. Daniel C.
Eckert Seamans Cherin & Mellott , LLC
Fiorito James
Pittsburgh Mineral & Environment Technology, Inc.
Silverman Stanley
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