US PATENT SUBCLASS 75 / 483
.~.~.~.~ Superposed multiple hearth reduction

Current as of: June, 1999
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75 /   HD   SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES

330  DF  PROCESSES {9}
392  DF  .~ Producing or treating free metal {10}
414  DF  .~.~ At 300 degrees C or greater (e.g., pyrometallurgy, etc.) {7}
433  DF  .~.~.~ Iron(Fe) {18}
483.~.~.~.~ Superposed multiple hearth reduction

DEFINITION

Classification: 75/483

Superposed multiple hearth reduction:

(under subclass 433) Process in which a reducible Iron (Fe) compound is passed downwardly from one hearth to another hearth located immediately below during its reduction to metallic Iron. Usually there are three or more superposed hearths with the reducible Iron compound passing downward from hearth to hearth during the process.