C21B5/02—Making special pig-iron, e.g. by applying additives, e.g. oxides of other metals
C21B5/023—Injection of the additives into the melting part
C—CHEMISTRY; METALLURGY
C21—METALLURGY OF IRON
C21B—MANUFACTURE OF IRON OR STEEL
C21B13/00—Making spongy iron or liquid steel, by direct processes
C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
C21B13/0026—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide in the flame of a burner or a hot gas stream