Methods for removing silver from spent photoprocessing solution

Details Methods for removing silver from spent photoprocessing solution Methods for removing silver from spent photoprocessing solution

1996-05-16

1997-12-09

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

75417, 75635, 75713, 75722, 75723, 210715, 210727, 210738, 210803, 210804, 210912, C02F 156

Patent

active

056956452

ABSTRACT:
Spent solutions from photographic processors are fed into a conduit (18) to which subsequently are added precipitating agents from a first source (22) and flocculating agents from a second source (28); so that, well grown or ripened clumps of flocculated solids are formed along the conduit before being emptied into a gravity collecting vessel and shipping container (38) from which clarified liquids are displaced by a mass (50) of accumulated flocculated solids, typically through a filter (58, 142, 150, 158, 162, 166, 220)for removal of any unsettled fines. Many of the clumps of flocculated solids become enlarged enough to individually extend across and substantially fill a cross-sectional area of the conduit. As a result, the enlarged clumps substantially block passage of and strain from the solution remaining fine particles which then adhere to the clumps.

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