Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Patent
1993-03-29
1994-11-15
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
75503, 75586, 75623, 75629, 75658, 75669, 75695, 75958, 588234, C21B 1100
Patent
active
053644476
ABSTRACT:
A smelting process for blending hazardous and non-hazardous inorganic industrial wastes with carbon or aluminum reducing agents to simultaneously recover metal alloys (reducible metals), metal oxides (volatile reducible metals), carbon dioxide and man-made vitreous fiber (non reducible metals). Wastes including hazardous wastes of U.S. EPA Series D, F, P, K, and U are pulverized and blended with liquids such as water or waste water to produce a homogeneous mass. The mass is formed into briquettes and melted in a cupola or plasma arc furnace in the presence of carbon or aluminum to reduce metals. Other types of furnaces such as an electric arc furnace may be used to avoid the steps of forming and curing briquettes. Reduction is carried out at temperatures between 1660 and 3100 degrees Fahrenheit. Calcium flux from calcium-stabilized wastes enhances mineral wool quality, lowers the sulfur content of metals and raises pH to facilitate metal reduction. Reducible metals are reduced and drawn off into molds. Substantial purity is obtained in the recovered reducible metals. Volatile metals are volatilized and reclaimed in the air pollution control system. Remaining slags mainly comprising oxides of non-reducible metals are used to produce mineral wool. Heavy solids and unspun shot particles are recycled into the system to eliminate waste.
REFERENCES:
patent: 4213779 (1980-07-01), Caswell
patent: 4673431 (1987-06-01), Bricmont
patent: 5198190 (1993-03-01), Philipp et al.
Philipp Carl T.
Sims Bobby H.
Andrews Melvyn J.
Carver Stephen D.
Enviroscience, Inc.
Keisling Trent C.
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