Recovery of precious metals from spent alumina-containing cataly

Details Recovery of precious metals from spent alumina-containing cataly Recovery of precious metals from spent alumina-containing cataly

1980-09-30

1982-06-29

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 10R, 75 65R, C22B 1100

Patent

active

043370853

ABSTRACT:
The invention relates to the recovery of precious metals which is accomplished by melting an alumina-containing spent catalyst having therein a minor amount of a precious metal. The melted alumina containing carrier material is heated to about 2100.degree. C. in an electric furnace. The alumina material is poured from the furnace for utilization in abrasives manufacture. The precious metal collects in the bottom of the furnace and is either poured off and allowed to solidify or allowed to solidify in the furnace. In one embodiment of the invention, the steps of melting spent catalyst and heating to form a molten mixture is repeated a multiplicity of times with pouring off of the molten carrier material. As a multiplicity of meltings and pourings are carried out, gradually there is an appreciable accumulation of the precious metals in the bottom of the furnace.

REFERENCES:
patent: 545001 (1895-08-01), Van Cleve
patent: 2828200 (1958-03-01), Nixon
patent: 2860045 (1958-11-01), Nixon
patent: 3469971 (1969-09-01), Leopard
patent: 3694190 (1972-09-01), Langston
patent: 3951648 (1976-04-01), Stern
patent: 4029495 (1977-06-01), Hirayama
patent: 4142871 (1979-03-01), Zeiringer
Cichy "Fused Aluminum Production", Electric Furnace Proceedings, pp. 162-175 (1971).

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