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According to a method of operating a blast furnace, pure oxygen, pulverized coal, and a temperature control gas which substantially does not contain nitrogen are blown from tuyres. A preheating gas which substantially does not contain nitrogen is blown from an intermediate shaft level. A blast furna

According to a method of operating a blast furnace, pure oxygen, pulverized coal, and a temperature control gas which substantially does not contain nitrogen are blown from tuyres. A preheating gas which substantially does not contain nitrogen is blown from an intermediate shaft level. A blast furnace gas which substantially does not contain nitrogen can be produced from a furnace top.

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A method of operating a blast furnace having a furnace top, a shaft and a hearth fitted with tuyeres opening to said hearth at a tuyeres nose, comprising the steps of: charging a charge including iron ore and coke as major constituents from said furnace top into said blast furnace; blowing pure oxyg

A method of operating a blast furnace having a furnace top, a shaft and a hearth fitted with tuyeres opening to said hearth at a tuyeres nose, comprising the steps of: charging a charge including iron ore and coke as major constituents from said furnace top into said blast furnace; blowing pure oxygen, pulverized coal, and a temperature control gas from said tuyeres, said temperature control gas being adapted to prevent a temperature rise at the nose of said tuyere; blowing an oxidizing preheating gas which is substantially devoid of nitrogen from an intermediate level of said shaft to increase the volume of gas upward from said intermediate level of said shaft and to preheat the charge in said blast furnace to a temperature of from 500°to 1,200°C. such that reduction of said charged iron ore can take place at a satisfactory reaction rate; and combusting coke with said pure oxygen to melt said iron ore and to generate a blast furnace gas which is substantially devoid of nitrogen.