초록 ▼

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 dime

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°F. and 1400°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.

대표청구항 ▼

A method for the treatment of spent potlinings used in aluminum production, which method comprises: reducing spent potlinings to particles having a size of not greater than about 2 inches in any dimension; and roasting said particulate potlinings in a nitrogen-containing atmosphere at a temperature

A method for the treatment of spent potlinings used in aluminum production, which method comprises: reducing spent potlinings to particles having a size of not greater than about 2 inches in any dimension; and roasting said particulate potlinings in a nitrogen-containing atmosphere at a temperature of at least about 500°F. but below 1400°F., for a time sufficient to substantially reduce the cyanide content thereof without incurring substantial combustion thereof.