Method for recycling oily mill scale

Details Method for recycling oily mill scale Method for recycling oily mill scale

1981-10-23

1986-04-29

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 56, C21C 7068

Patent

active

045854750

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 external mechanical pressure. The agglomerated shapes are introduced 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 introduction into the molten metal, and all processing of the mill scale is conducted under ambient conditions of temperature, pressure and atmosphere. The agglomerated shapes may be aged prior to introduction into the molten metal.

REFERENCES:
patent: 1994378 (1935-03-01), Williams et al.
patent: 3189436 (1965-06-01), Burstlein
patent: 3340044 (1967-09-01), MacAfee et al.
patent: 3762886 (1973-10-01), Triska
patent: 4029497 (1977-06-01), Nixon
patent: 4148627 (1979-04-01), Haley
Perry, R. H. et al; Chemical Engineers' Handbook, McGraw Hill Book Company, p. 9--9, TP155 P4 (1973).

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