Chemistry of inorganic compounds – Carbon or compound thereof – Elemental carbon
Patent
1989-02-21
1990-11-27
Straub, Gary P.
Chemistry of inorganic compounds
Carbon or compound thereof
Elemental carbon
423460, 423DIG20, 423119, C04B 1814
Patent
active
049734644
ABSTRACT:
A process for the treatment of ground, spent potlinings generated during the production of metallic aluminum to reduce cyanide content to environmentally nonhazardous levels. Potlinings are ground or otherwise suitably reduced in size to a particle size of not greater than about 2 inches in any dimension and roasted in a stream of air or nitrogen at a temperature between about 500.degree. F. and 1400.degree. F. Roasting for an appropriate time-temperature interval reduces cyanide content to desired levels without combustion of a major portion of carbonaceous material, resulting in an end product rich in carbon and fluorine which may be salable because of this content.
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"Laboratory Feasibility Studies for the Fluidized-Bed Combustion of Spent Potlinings from Aluminum Reduction," Kim et al., Report No. EPA-600/2-84-064, Mar. 1984.
Kalinchak Stephen G.
Ogden Environmental Services
Straub Gary P.
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