Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1976-03-01
1977-11-08
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 21, 75 23, 75 77, C22B 1904, C22B 1308
Patent
active
040574229
ABSTRACT:
Disclosed is a process for extracting the following metals from ores containing same: iron, copper, zinc, arsenic, antimony, molybdenum, silver, and cadmium. In the process, the ore is concentrated and dehydrated prior to treating with a saturated hydrogen polysulfide or alkali metal polysulfide containing enough sulfur to sulfidize metals present in the ore in their nonsulfide forms and to completely oxidize the metals present in their sulfide form. This separates melt soluble sulfides (Cu, Fe, Mo, Sb, As) from melt-insoluble sulfides (Zn, Pb, Ag, Cd). The former are extracted with water to separate the water-soluble sulfides (Mo, As, Sb and any saturated polysulfide) from the water-insoluble sulfides (Cu, Fe,). The water-soluble sulfides are reacted with a more electropositive metal such as zinc to liberate them from their sulfur. The water-insoluble sulfides are dried and heated with a saturated hydrogen polysulfide or alkali metal polysulfide and the free metals are separated magnetically.
The melt-insoluble sulfides are heated with a saturated hydrogen polysulfide or alkali metal sulfide to liberate lead containing elemental silver. The lead is tapped off and some of the cadmium is distilled. The melt residues then are brought above the melting point of zinc under cover of an unsaturated hydrogen polysulfide or alkali metal polysulfide. The zinc is tapped and the polysulfide is reused.
REFERENCES:
patent: 3004846 (1961-10-01), Queneau
patent: 3057714 (1962-10-01), Back
patent: 3388870 (1968-06-01), Thumm
Kronman Albert F.
Rosenberg Peter D.
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