Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1997-12-09
1999-11-30
Willis, Prince
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75419, C22B 520
Patent
active
059935120
ABSTRACT:
A method and system for recycling byproduct streams from metal processing operations introduces a flow of a molten mixture of salts, metal and metal oxides from a melting vessel into a flow of water. The molten salts dissolve into the water. The metal oxides, and any metal entrapped in the molten mixture, instantly fragment into small particles. The slurry of brine and small particles flows into a storage tank and from there the brine can be separated from the small particles by employing a series of known liquid-solid separation techniques which preferably utilize cyclones, centrifuges, thickeners, and filters. In the case of aluminum processes, an antioxidant is preferably provided in the holding tank. To increase the settling rate of the solids, a flocculent can be added in the thickener. Salt can be recovered by spraying the brine onto the exterior surface of a rotating drum which is heated to high temperatures such that the water in the brine instantly evaporates and deposits a thin layer of salt on the drum which can be scraped off and prepared for sale. The drum is preferably heated by offgas from existing high temperature metal processing operations. The metal particles can be separated from the metal oxides using known techniques. The separated metals can be charged back into the melting vessel for final recovery. The metal oxides can be either sold or re-used in metal processing operations. Thus, all byproducts are completely recycled and no wastes are landfilled.
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Mazanek Mark S.
Pargeter John K.
Zuck Dale A.
AllMetTechnologies, Inc.
McGuthry-Banks Tima
Willis Prince
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