Method of melting oxidic slags and combustion residues
Assignee"Holderbank" Financiere Glarus AG
InventorAlfred Edlinger
Life of this patent
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Abstract
The process for melting oxidic slags and combustion residues having a minimum content of metallized portions such as, e.g., iron and/or carbon carriers, of 3% by weight is carried out in a shaft furnace directly heated by means of fossil fuels via burners. The molten slag bath is transferred into a hearth type furnace immediately adjoining the shaft furnace and in which metals such as, for instance, copper are separated by sedimentation under thermal dissociation and discharged separately via a bottom outlet. The completely oxidized slag reaches a consecutively arranged slag treating reactor via a separate discharge.
Claims20
A process for melting oxidic slags and combustion residues having a minimum content of metallized portions of 3% by weight, said process comprising:
- charging the oxidic slags into a slag charging zone of a shaft furnace;
- directly heating the slag charging zone from below with fossil fuels to generate a resultant melt and combustion offgases;
- adjusting an amount of combustion air or combustion oxygen so as to maintain a free oxygen amount of >2% by volume in the combustion offgases within the slag charging zone;
- transferring the resultant melt into a hearth furnace connected with said shaft furnace and sedimenting the resultant melt under oxidizing conditions to generate a sedimented metallic phase and a slag phase of the resultant melt;
- and
- discharging the sedimented metallic phase from the hearth furnace separately from the slag phase.
Dependencies are inferred from the claim text.