| 75 / | HD | SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES |
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| 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} |
| 488 | DF | .~.~.~.~ Reduction to metallic Iron(Fe) within shaft furnace {2} |
| 489 | DF | .~.~.~.~.~ Externally supplied gas reductant {1} |
| 490 |  | .~.~.~.~.~.~ Solid Iron(Fe) produced within shaft furnace {4} |
| 491 | DF | .~.~.~.~.~.~.~> With melting Iron(Fe) product outside shaft furnace {1} |
| 493 | DF | .~.~.~.~.~.~.~> Using solid Carbon(C) to generate gas in separate furnace (e.g., Wiberg process, etc.) {1} |
| 495 | DF | .~.~.~.~.~.~.~> Direct addition of gas containing gaseous Oxygen or water to shaft furnace (e.g., continuous HyL process, etc.) |
| 496 | DF | .~.~.~.~.~.~.~> With reformation of reducing gas in separate furnace (e.g., Midrex process, etc.) {2} |