Recovery of non-ferrous metals from dross using plasma torch

Details Recovery of non-ferrous metals from dross using plasma torch Recovery of non-ferrous metals from dross using plasma torch

1989-12-27

1990-10-02

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 1021, C22B 402

Patent

active

049604600

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 soild 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: 1917856 (1933-07-01), Schmeller, Sr.
patent: 2768075 (1956-10-01), Sterental
patent: 3043678 (1962-07-01), Lowry et al.
patent: 3403211 (1968-09-01), Foex
patent: 4877448 (1989-10-01), Lindsay

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