Filter process for silver recovery from polymeric films

Details Filter process for silver recovery from polymeric films Filter process for silver recovery from polymeric films

1986-07-28

1988-08-23

Michl, Paul R.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

528488, C22B 1104

Patent

active

047658355

ABSTRACT:
Silver is removed from polymeric film chips such as photographic and X-ray film in a caustic treatment bath which dissolves or separates the saran and gelatin layer from the polymer, particularly polyester, layer. The silver is captured for recovery in a diatomaceous filter medium through which the treatment bath liquid is passed. Preferably liquid passed to the filter is silver-rich liquid skimmed from the top of the treatment bath. Chips and other debris are seived or screened from the liquid before filtering.

REFERENCES:
patent: 3647422 (1972-03-01), Wainer
patent: 4392889 (1983-07-01), Grout
patent: 4585561 (1986-04-01), Zlokarnik
patent: 4612057 (1986-09-01), Buser

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