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US 6,241,797 B1Granted
Process for reducing oxidic slags
Assignee"Holderbank" Financiere Glarus AG
InventorAlfred Edlinger
Life of this patent
Estimating the term…
Abstract
There is disclosed a process for reducing oxidic slags or combustion residues above a metal bath. The metal bath is formed of an iron alloy containing metals nobler than iron and whose redox potential is adjusted such FeO is reduced to Fe not at all or only partially.
Claims17
A process comprising:
- reducing at least one member comprising iron selected from the group consisting of oxidic slag and combustion residue above a reducing metal bath, said reducing metal bath comprising an iron alloy including metals nobler than iron and having a redox potential adjusted such that reduction of iron oxide to iron is avoided;
- adding a member selected from the group consisting of Al, FeSi, and C to said reducing metal bath to control said redox potential;
- and
- maintaining said reducing metal bath at a carbon content of below 5% by weight.
1 more element
A process comprising:
- providing an oxidizinigly operated meltdown reactor, and receiving and melting at least one member comprising copper selected from the group consisting of oxidic slag and combustion residue to form a slag melt;
- transferring said slag melt into a fore-hearth;
- setting a temperature within said fore-hearth to above 1500°° C. and heating said slag melt in said fore-hearth to provide a copper melt;
- separating said copper melt from said slag melt by tapping said copper melt from said fore-hearth at said temperature while retaining in said fore-hearth a completely oxidized slag bath, said completely oxidized slag bath comprising iron oxide;
- discontinuously charging said completely oxidized slag bath into a reducing metal bath contained in a metal bath reactor, said reducing metal bath comprising an iron alloy including metals nobler than iron and having a redox potential adjusted such that reduction of iron oxide to iron is avoided;
- adding a member selected from the group consisting of Al, FeSi, and C to said reducing metal bath to control said redox potential;
- and
- maintaining said reducing metal bath at a carbon content of below 5% by weight.
5 more elements
Dependencies are inferred from the claim text.