Method for removing chrome and/or nickel from liquid slags

Details Method for removing chrome and/or nickel from liquid slags Method for removing chrome and/or nickel from liquid slags

2005-02-15

2005-02-15

Andrews, Melvyn (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C075S629000, C420S590000

Reexamination Certificate

active

06855189

ABSTRACT:
In a method for removing chromium oxide and nickel oxide, and combinations thereof, from liquid slags or slag mixtures, in which the liquid slag is A charged onto a metal bath, in particular an iron bath, and reduced by feeding carbon or carbon carriers, the carbon feed into the metal bath is effected until a decrease of the Cr and/or Ni oxide contents of the slag to a value of between 0.8 wt.-% and 0.2 wt.-%. As the pregiven Cr and/or Ni oxide content range of the slag is reached, reductants having higher reduction potentials such as, e.g., Al, Ca, Si, Fe—Si or Ca—Si are added in order to lower the Cr and/or Ni oxide contents to below 0.15 wt.-%, preferably below 0.08 wt.-%.

REFERENCES:
patent: 4001012 (1977-01-01), Rote et al.
patent: 5302184 (1994-04-01), Batterham et al.
patent: 6409793 (2002-06-01), Edlinger
patent: 6679931 (2004-01-01), Gotzinger et al.
patent: 54-158313 (1979-12-01), None

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