Method for reducing oxidic slags and dusts and inductively heatable furnance for carrying out this method
A method for reducing oxidic slags and dusts possibly loaded with organics uses an inductively heatable coke bed extending in the axial direction and having a temperature gradient. Reaction gas is sucked off in an axial region of the coke bed between two induction bodies and metal regulus and slag melt are tapped on the lower end. An inductively heatable shaft furnace chargeable with a lumpy coke bed for the reduction of metallic slags is made of an electrically insulating refractory material, has an adjustable temperature gradient includes at least one cooled induction body on the head side, a suction connection in an axial region where the prevailing temperature exceeds the condensation point of the substances to be removed, located below the cooled induction body on the head side, and an opening for tapping metal regulars and slag melt is provided on the lower end of the furnace.
1. An inductively heatable shaft furnace for reduction of metallic slags, wherein said shaft furnace is adapted to be charged with a lumpy coke bed, and is comprised of an electrically insulating refractory material, and wherein a temperature gradient of said shaft furnace is adjustable, comprising
at least one head-side induction body arranged on a head side of said shaft furnace;
a suction connection arranged in an axial region of said shaft furnace located below said at least one head-side induction body, and in which a prevailing temperature is above a condensation point of noxious substances to be removed; and
an opening positioned on a tap end of said shaft furnace for tapping metal regulus and slag melt,
wherein said shaft furnace, in said axial region located below said at least one head-side induction body, comprises a region with an enlarged diameter.
2. A device according to claim 1 , wherein said at least one head-side induction body is cast into the refractory material of said shaft furnace.
3. A device according to claim 1 , wherein said at least one head-side induction body is designed as a coil.
4. A device according to claim 1 , wherein said at least one head-side induction body is designed as a slotted collar.
5. A device according to claim 1 , wherein a cold charging end of the shaft furnace is open.
6. A device according to claim 1 , further comprising nozzles for flushing the coke bed with oxygen and/or hot blast, said nozzles being positioned near said at least one head-side induction body.
7. A device according to claim 1 , further comprising nozzles for flushing the coke bed with at least one of oxygen, hot blast, and fuels, said nozzles being positioned near said tap end of said shaft furnace.
8. A device according to claim 1 , further comprising at least one tap-end induction body arranged in a vicinity of the tap end of the shaft furnace.