US PATENT SUBCLASS 75 / 468
.~.~.~.~.~ Top gas recovery

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}
458  DF  .~.~.~.~ Blast furnace reduction to produce molten Iron(Fe) {7}
468.~.~.~.~.~ Top gas recovery

DEFINITION

Classification: 75/468

Top gas recovery:

(under subclass 458) Process which includes a step of handling, treating, or using the gas which comes off the top of the blast furnace after passing through the burden (e.g., by recovering a byproduct, removing pollutants, or recovering heat, etc.).