Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1990-12-07
1992-05-12
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75713, 266170, 291637, C22B 302
Patent
active
051123908
ABSTRACT:
Equipment and methods for an efficient, low cost silver recovery apparatus for recovering silver from a silver-containing solution. The apparatus comprises a replaceable silver recovery subassembly, stackable container, lid, lock ring which is locked or sealed to make the container tamperproof, and an L-shaped connector by which an anodic silver reducing, hollow core metal coil in the replacement subassembly is releasibly connected to an effluent port of the recovery apparatus. The silver recovery subassembly comprises a mesh bag which is a carrier of the metal coil and containment filter for influent sludge and particulates produced during silver reduction. The mesh bag, with support by the container and lid provides a capturing net for incoming sludge as well as particulates which form during the silver reduction process. The top and bottom of the metal coil is sealed to permit only transverse flow of liquid through the sides of the coil and walls of the hollow core to produce a maximum path length for liquid across the metal matrix of the coil. The L-shaped connector comprises an orthogonal tubular path which insertably connects the core of the coil with the effluent port of the apparatus, said connection being height adjustable to provide a level upper horizontal leg for unimpeded effluent flow and for assured placement of an aperture or slit at the top of the horizontal leg which provides an emergency outlet when the coil and other fluid pathways are obstructed.
REFERENCES:
patent: 3630505 (1971-12-01), MacKay
patent: 3692291 (1972-09-01), MacKay
patent: 3744995 (1973-07-01), MacKay
patent: 3840217 (1974-10-01), MacKay
patent: 4130273 (1978-12-01), Woog
patent: 4240617 (1980-12-01), MacKay
patent: 4441697 (1984-04-01), Peterson et al.
patent: 5026029 (1991-06-01), Peterson
Apr. 1968 Bureau of Mines Report of Investigations 7117, "Silver Recovery from Waste Photographic Solutions by Metallic Displacement".
Andrews Melvyn J.
Foster Lynn G.
Pioneer Refining Services, Inc.
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