B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
53/165, 23/360
B01D 50/00 (2006.01) B01D 33/00 (2006.01) B01D 36/00 (2006.01) B01D 53/46 (2006.01) C01G 17/02 (2006.01) C03B 37/014 (2006.01) C03B 37/018 (2006.01)
Patent
CA 1220616
- 25 - METHODS OF RECOVERING A CONSTITUENT OF A PROCESS EFFLUENT Abstract This invention is a process of recovering a constituent of a process effluent, such as an effluent of a process for making a preform from which an optical fiber is drawn. The effluent is directed into a scrubber (40) of a loop (20) where it is treated with an aqueous solution to provide a solvent mixture which comprises particulates and a solvent solution including the constituent, e.g., germanium. Subsequently, the solvent mixture is moved into a first filter system (55) which provides a filtrate free of particulates above a first size that is returned to the scrubber for reuse and a residue. Then the residue from the first filter system is moved into a second filter system (80) which provides a filtrate free of particulates larger than a second size that is smaller than the first size and a residue. The filtrate from the second filter system also is returned to the scrubber for reuse while the residue from the second filter system is recirculated therethrough. When the constituent, e.g., germanium, concentration reaches a predetermined level, portions of the residue from the second filter system are withdrawn and subsequently treated with a precipitating agent to recover the constituent, e.g., germanium. (FIG. 1).
472580
Gill Roger F.
Narasimham Pundi L.
American Telephone And Telegraph Company
Kirby Eades Gale Baker
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