Recovery of non-ferrous metals from dross

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

1994-07-15

1995-11-28

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22B 704

Patent

active

054703760

ABSTRACT:
A process of recovering a non-ferrous metal from a dross containing the same. The process involves introducing into a rotary furnace the dross and a fluoride compound which becomes substantially molten above the melting point of the metal, heating the dross and fluoride compound to a maximum temperature above the melting point of the metal, using a heating device which substantially maintains a non-oxiding atmosphere in the furnace, rotating the furnace until the dross reaches the maximum temperature, removing the molten metal thereby separated from a solid dross residue and removing the solid dross residue from the furnace. The fluoride compound, which may be, for example, cryolite, recovered cryolite, AlF.sub.3 or NaF, or a mixture thereof, is such that it remains in the dross during the process and does not make the dross become sticky. The use of the fluoride improves the rate of recovery of the metal content of the dross without producing environmental difficulties either during the heating operation or during the disposal or use of the dross residue.

REFERENCES:
patent: 2481591 (1949-09-01), Heilman et al.
patent: 3043678 (1962-07-01), Lowry
patent: 4033760 (1977-07-01), Lance
patent: 4040820 (1977-08-01), Loach
patent: 4673591 (1987-01-01), McMahon

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