US PATENT SUBCLASS 75 / 458
.~.~.~.~ Blast furnace reduction to produce molten Iron(Fe)

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.~.~.~.~ Blast furnace reduction to produce molten Iron(Fe) {7}
459  DF  .~.~.~.~.~> Using additive to the blast {3}
467  DF  .~.~.~.~.~> Tapping molten product
468  DF  .~.~.~.~.~> Top gas recovery
469  DF  .~.~.~.~.~> Specified method of charging burden
470  DF  .~.~.~.~.~> Defined composition of slag
471  DF  .~.~.~.~.~> Defined composition of reductant
472  DF  .~.~.~.~.~> Defined composition of Iron(Fe) source

DEFINITION

Classification: 75/458

Blast furnace reduction to produce molten Iron (Fe):

(under subclass 433) Process wherein an Iron (Fe) compound is reduced in a shaft furnace with solid reductant, normally coke, with a preheated forced blast of gas containing gaseous Oxygen, normally air. A blast furnace is operated in a continuous manner, with additional burden (i.e., solid Iron compound, reductant, and flux) being added at the top of the furnace as the burden is consumed. Preheated gas containing gaseous Oxygen (the "blast") is added under pressure through tuyeres just above the level of molten Iron and slag produced by the reduction.