Abstract: Form or pressed bodies, such as briquettes, are made of a mixture including at least two components. A first component is formed by at least one fine grained solid material which does not soften below 800.degree. C. A second component is formed by at least one binding agent that is pyrolytically decomposable. Each of the components has a mean mixing and deformation temperature such that the mean temperature of the first component is above a standard mixing and deforming temperature while the mean temperature of the second component is below the standard temperature. The standard temperature is such that a pyrolysis and degassing performed at the standard temperature does not destroy the binding ability of the second component. The second component constitutes about 15% by weight to about 50% by weight of the total mixture. Further, the second component is at least partly a liquified bituminous material having a mean CCT-value above 20%.

Abstract: According to the instant invention fine and very fine granular zinc- and lead-containing oxidic byproducts are mixed with thermally inert additives and are hot briquetted with caking coal as a binder at a temperature of 490.degree..+-.40.degree. C. using sufficient carbon to reduce all of the metallic components in the byproducts. Then this mixture is briquetted and heated to more than 700.degree. C. and is maintained at this high temperature for a predetermined time to reduce, that is deoxidize, most of the oxidic components of the briquets, especially zinc, lead, and iron oxides. When the byproducts are not dry, which is standard with a wet scrubbing system for cleaning stack gases, the resultant slurry must be dried before it can be treated according to this invention. The carbon according to the invention is added as fine-granular caking coal in portions of at least 20% by weight. Preferably the portion is between 25% and 35% and up to 40%.