Recovery of non-ferrous metals from dross

Details Recovery of non-ferrous metals from dross Recovery of non-ferrous metals from dross

1988-12-19

1990-09-25

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 1021, C22B 2100

Patent

active

049591002

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.

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patent: 3999980 (1976-12-01), Montagna
patent: 4137073 (1979-01-01), Singleton
patent: 4583229 (1986-04-01), Yu

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