Alloys or metallic compositions – Containing over 50 per cent metal but no base metal – Iron containing
Patent
1990-12-21
1993-03-30
Andrews, Melvyn J.
Alloys or metallic compositions
Containing over 50 per cent metal but no base metal
Iron containing
75586, 75654, 75958, 423DIG18, C22C 3304
Patent
active
051981904
ABSTRACT:
A method of recycling hazardous and non-hazardous industrial wastes to reclaim valuable metals, metal alloys, and metal oxides, and to produce mineral wool. Wastes including hazardous wastes of USEPA Series D, F, P, K, and U are pulverized and blended with liquids such as water or wastewater to produce a homogeneous mass. Calcium from calcium-stabilized wastes is used to enhance the quality of the mineral wool, lower the sulfur content, remove phosphorous, and raise pH to facilitate metal reduction. The mass is formed into briquettes and melted in a cupola or shaft 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. 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 comprising principally oxides of non-reducible metals are used to produce mineral wool. Exhausts, heavy solids, and unspun shot particles are recycled into the system to eliminate waste.
REFERENCES:
patent: 4381938 (1983-05-01), Claflin
patent: 4495054 (1985-01-01), Claflin
patent: 4529446 (1985-07-01), Valenti
Philipp Carl T.
Sims Bobby H.
Andrews Melvyn J.
Carver Stephen D.
Enviroscience, Inc.
LandOfFree
Method of recycling hazardous waste does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of recycling hazardous waste, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of recycling hazardous waste will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1279612