Recovery of lead and silver from minerals and process residues

Details Recovery of lead and silver from minerals and process residues Recovery of lead and silver from minerals and process residues

1981-05-20

1983-02-08

Hearn, Brian E.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75120, 75 77, 75 83, 423 38, 423 94, 423 98, 423593, 423619, C01G 2122, C22B 700, C22B 1300, C22B 1100

Patent

active

043727824

ABSTRACT:
Residues containing lead as lead sulphate and silver in the form of native silver or silver chloride, sulfide or sulphate, as well as silver complexes with other metals, and resulting from the roasting and leaching of sulfide concentrates containing lead, zinc, copper, and silver are treated to produce a high grade lead and silver product containing lead predominantly as calcium plumbate in a process wherein the residue is leached with brine, the resultant leach solution treated with lime to precipitate lead as oxychlorides, and the resultant lime-oxychloride precipitate is calcined to produce a mixture of calcium orthoplumbate and lead oxide. Residual chloride can be washed easily from this product which may then be treated in a lead blast furnace to recover lead and associated silver in their elemental state.

REFERENCES:
patent: 1549062 (1925-08-01), Christensen
patent: 2109755 (1938-03-01), Sessions
patent: 2142274 (1939-01-01), Kuss
patent: 4063933 (1977-12-01), Peters
patent: 4127639 (1978-11-01), Piret
Ermilov et al., Trudy Institut Metallurgii Obogashcheniia, vol. 30, (1969), p. 47.
Denev et al., Dokl. Bolg. Akad. Nauk, vol. 26, No. 11, (1973), p. 1485.

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