Recovery of silver@ from suspension after enzymatic sepn. from film waste - by acidifying, flocculating with sodium sulphite and precoat filtration

• Main Authors: ROSSMANN, RALPH, O-6908 JENA-WINZERLA, DE, ANGER, IMMO., O-6900 JENA, DE
• Format: Patent
• Language: English; German
• Published: 07.01.1993
• Subjects: AUXILIARY PROCESSES IN PHOTOGRAPHY; BEER; BIOCHEMISTRY; CHEMISTRY; CINEMATOGRAPHY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; ELECTROGRAPHY; ENZYMOLOGY; FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIREDCHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERSFROM A RACEMIC MIXTURE; FERROUS OR NON-FERROUS ALLOYS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HOLOGRAPHY; METALLURGY; MICROBIOLOGY; MUTATION OR GENETIC ENGINEERING; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES; PHOTOGRAPHY; PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHYSICS; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; SPIRITS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TREATMENT OF ALLOYS OR NON-FERROUS METALS; VINEGAR; WINE

Method involves acidifying a silver suspension to pH 4.5-5.5, treatment with 0.05-0.2 g/l Na2SO3 and filtration through a precoat layer after flocculation for 30-60 min.. The precoat layer pref. consists of acicular CaSO4.2H2O crystals with a length of 20-150 microns and width of 2-10 microns. USE/A...