Patent ID: 8246716
Filing Date: 2012-08-21
Classification: C21C,Y02P

Abstract:
1. A fluxing agent that can be used in production of steel, produced by a method that comprises: providing 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, 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, and wherein the fluxing agent contains (in % by weight): 20-30 Fe 20-80 CaF 4-10 Cr 1-4 NiO 8-12 CaO 1-3 SiO 0.1-15 CaSO 0.2-0.5 MnO 0.4-0.6 MgO max 0.02 C.