|
DE585543C
|
|
Shaft furnace system for the treatment of solid substances with gases
|
|
GB294838A
|
|
Improved process for the production of reducing gases
|
|
DE466359C
|
|
Manufacture of reducing gases
|
|
GB286067A
|
|
Improvements relating to the production of synthetic pig iron
|
|
US1638684A
|
|
Reduction process using circulating reducing gases
|
|
DE438558C
|
|
Process for the reduction of metal oxides, in particular iron ores
|
|
US1683534A
|
|
Method of using high-tension electric arcs for treatment of gases
|
|
CA283386A
|
|
Process of making synthetic pig iron
|
|
CA308660A
|
|
Shaft furnace for treating solid materials with gases
|
|
CA299080A
|
|
Process of making reducing gases
|
|
CA283385A
|
|
Gas processing method
|
