Making pig-iron in the blast furnace

Child Classifications

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• C21B 5/001
• C21B 5/006
• C21B 5/007
• C21B 5/008
• C21B 5/02 Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
• C21B 5/04 Making slag of special composition
• C21B 5/06 using top gas in the blast furnace process (in coke ovens C10B)