Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1972-08-22
1976-09-28
Vertz, Oscar R.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
96 50, 75118R, 75101R, 75108, 423 23, 423 42, 423 34, C22b 1100
Patent
active
039829324
ABSTRACT:
Silver is recovered from photographic waste liquids containing emulsified silver, silver compounds, and gelatin by reacting therewith a proteolytic enzyme while the reactants are maintained in an alkaline condition. Then the reactants are acidified to a pH of 4.2 or less by introducing an acid such as HCl or H.sub.2 SO.sub.4. Precipitation of gelatin-bound silver and silver compounds occurs upon acidification, and the precipitate is allowed to settle out in a settling tank. Supernatant liquid is removed from the top, neutralized and sent to sewer. Settled sludge is removed from the bottom and silver recovered, as by incineration. The operation can be conducted either batch-wise or continuously.
REFERENCES:
patent: 3748123 (1973-07-01), Bakker
M. Sramek, Chemical Abstracts, 4715g, (1963), Vol. 59.
Cross Ethel R.
Eastman Kodak Company
French William T.
Vertz Oscar R.
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