Method of recovering heavy metals

Details Method of recovering heavy metals Method of recovering heavy metals

1982-02-22

1983-09-13

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 25, 75 82, C22B 1500

Patent

active

044040270

ABSTRACT:
In a method of recovering heavy metals from filter residues containing metal oxides, metal hydroxides or metal carbonates, the residues are dried and reduced during heat supply in the presence of carbon-containing reducing agents. The metal-containing filter residues having a water content of 30 to 80% are dried in a three-compartment rotary drier (triplex drier), wherein a product having a grain size of 0.1 to 5 mm and a packing density of 0.4 to 1.2 kg/l results, which, after the addition of the carbon-containing reducing agents, is introduced into a crucible furnace at a filling height of 0.4 to 1.5 m. It is heated to a temperature above the melting point of the metal to be recovered. The filling height is kept approximately constant during the volume reduction of the material to be reduced occurring at an increased temperature by refilling the batch.

REFERENCES:
patent: 3793005 (1974-02-01), Kelly
patent: 3984232 (1976-10-01), Bell

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