Process for smelting lead refinery dross

Details Process for smelting lead refinery dross Process for smelting lead refinery dross

1978-03-24

1979-09-18

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 44S, 75 77, C22B 404, C22B 1306

Patent

active

041681550

ABSTRACT:
Lead refining drosses are fed to a furnace containing molten slag that is heated to at least about 1200.degree. C. by the resistance to electric current flowing between at least two electrodes immersed in the slag. The drosses are smelted to separate matte and metal phases which are tapped from the furnace.
The process is particularly advantageous for smelting drosses containing significant amounts of nickel or cobalt and arsenic which react to form speisses. The speisses have densities between that of the matte and the metal and melting points that are high compared to the matte and metal. Resistance heating of the slag insures that any speiss formed is maintained in the molten state thereby minimizing precipitation of the speiss on the furnace walls.

REFERENCES:
patent: 3395010 (1968-07-01), Shoeld
patent: 4030916 (1977-06-01), Liniger
C. Hayward, "How to Smelt Battery-Plate Scrap", Engineering and Mining Journal, pp. 80-83, vol. 145, No. 3, (Mar., 1944).

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