Method and apparatus for recovery of non-ferrous metals from dro

Details Method and apparatus for recovery of non-ferrous metals from dro Method and apparatus for recovery of non-ferrous metals from dro

1993-04-28

1995-06-06

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 1021, 75672, 266213, 373 20, 423111, C22B 700

Patent

active

054218500

ABSTRACT:
A method and apparatus for treating non-ferrous metal drosses in order to recover the free metal contained therein. The dross is heated by a plasma torch in a rotary furnace, preferably to a temperature above 800.degree. C. The plasma heating and rotary motion make it possible to recover metal from the dross without employing the conventional salt bath. This means that the gases exiting the furnace can be treated more easily to remove pollutants and the solid residues can be discarded without risk of causing environmental pollution. By controlling the speed of rotation of the furnace, large dross lumps can be accommodated and so the conventional grinding and screening procedure of the dross can advantageously be eliminated.

REFERENCES:
patent: 3043678 (1962-07-01), Lowry et al.
patent: 3403211 (1968-09-01), Foex
patent: 4952237 (1990-08-01), Dube
Yerouchalmi, D., "Developpement du four rotatif a haute temperature chauffe axialement par un plasma d'arcs et essais fusions d'oxydes ultra-refractaires," High Temperatures-High Pressures, 1971, vol. 3, pp. 271-286. & (English Translation).

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