Patent ID: 6245123
Filing Date: 2001-06-12
Classification: C21B,C22B,F27B,Y02P

Abstract:
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; anddischarging the sedimented metallic phase from the hearth furnace separately from the slag phase.