Method in connection with steel production
AssigneeOutokumpu Oyj
InventorsSven-Eric Lunner, Ye Guozhu
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Abstract
A method of producing a fluxing agent that can be used in production of steel, preferably stainless steel, employs as a raw material a hydroxide sludge that results from neutralization of metal-contaminated pickling liquid from a pickling step for a steel and contains at least one fluoride-containing compound. The hydroxide sludge is calcined. Steel, preferably stainless steel, is produced by decarburizing a steel heat, whereby a slag is formed on top of the steel heat, and adding a fluxing agent to the slag.
Claims6
A method of producing a fluxing agent that can be used in production of steel, preferably stainless steel, wherein as a raw material for the production of said fluxing agent is used a hydroxide sludge resulting from neutralisation of metal-contaminated pickling liquid from a pickling step for a steel, said hydroxide sludge containing at least one fluoride-containing compound, the method comprising:
- heating said hydroxide sludge to a temperature from 1000° C. to 1300° C.,
- allowing the hydroxide sludge to cool to ambient temperature, and
- crushing the cooled hydroxide sludge.
Dependencies are inferred from the claim text.