Recovery of metals from sulphidic material

Details Recovery of metals from sulphidic material Recovery of metals from sulphidic material

1994-05-04

1995-01-10

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

423 27, C22B 1508

Patent

active

053803540

ABSTRACT:
A process for recovering zinc and iron from zinc- and iron-containing sulphidic material, which also contains lead and silver, in which the sulphidic material is leached under oxidizing conditions in a two stage countercurrent pressure leach to produce a zinc-containing solution from which zinc can be recovered by conventional means such as electrowinning, followed by a reducing leach to produce a lead- and silver-bearing product containing substantially all of the lead and a substantial portion of the silver present in the zinc-containing sulphidic materials, and a high strength iron bearing solution having the iron in the ferrous state from which substantially pure, saleable or environmentally acceptable iron residue in the form of hematite which contains the majority of the soluble iron present in the zinc-containing sulphidic materials is produced.

REFERENCES:
patent: 3954450 (1976-05-01), Kuhn
patent: 4606763 (1986-08-01), Weir
patent: 4614543 (1986-09-01), Duyvesteyn
patent: 4671945 (1987-06-01), Thomassen
patent: 4676828 (1987-06-01), Andre

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