Method and device for producing silicon-rich foundry iron

摘要

Disclosed is a process and apparatus for generating high-silicon foundry pig iron. In the process:a) silicon oxides and iron-carbon metals are charged in a shaft furnace;b) the charge is kept under a highly reducing atmosphere;c) the material column is guided annularly at least in the vicinity of the vessel bottom andd) exposed to the radiation heat of a heat source located in the free space in the outlet region of the annular material column above the furnace base.The furnace has a centrally arranged electrode, which projects into the furnace vessel and is guided up to the vicinity of the base, and a counterelectrode arranged in the base of the furnace vessel. The electrode projecting into the vessel is enclosed by a coaxially guided sleeve whose outer diameter "d" is in a ratio to the inner diameter "D" of the furnace vessel such that d;D is about 1:4. The sleeve mouth is at a distance "a" from the base of the furnace vessel such that 2xd<=a<=4xd.