Verfahren und Vorrichtung zur Erzeugung von siliziumreichen Gießereiroheisen

摘要

The invention concerns a method and device for producing silicon-rich foundry iron. The method is characterized by the following steps: a) a shaft furnace is charged with silicon oxide and iron-carbon metals; b) the charge is maintained in a highly reductive atmosphere; c) the column of material is guided in an annular manner at least in the vicinity of the vessel base; and d) is exposed to the radiant heat of a heat source located in the free space in the region into which the annular column of material opens above the furnace base. The direct current furnace, which has a central electrode which projects into the furnace vessel and is guided as far as the vicinity of the base and a counter electrode disposed in the base of the furnace vessel, is characterized in that the electrode projecting into the vessel is surrounded by a coaxial sleeve, the ratio between the outer diameter (d) of the sleeve and the inner diameter (D) of the furnace vessel being 1:4, and the mouth of the sleeve being disposed at a spacing (a) from the furnace vessel base according to the relationship 2 x d