C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/4, 53/75
C22B 1/244 (2006.01)
Patent
CA 1154595
ABSTRACT Oily mill scale recovered from steel manufacturing operations downstream of a refining stage for molten steel is recycled to the refining stage. Coarse particles of mill scale are removed in a pre-screening operation, the mill scale is mixed and blended with a binder, and the mixture is agglomerated into shapes, such as briquettes, using exter- nal mechanical pressure. The agglomerated shapes are intro- duced into molten metal containing excessive carbon, where the shapes act as a coolant and the iron oxide in the mill scale reacts with some of the carbon. The oily mill scale is neither deoiled nor ground more finely prior to intro- duction into the molten metal, and all processing of the mill scale is conducted under ambient conditions of temper- ature, pressure and atmosphere. The agglomerated shapes may be aged prior to introduction into the molten metal.
374730
Inland Steel Company
Ridout & Maybee Llp
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