METHOD FOR RECOVERING SILVER
PURPOSE:To recover economically and efficiently silver from waste liquor contg. a silver salt by adjusting the waste liquor to a specified pH, adding a small amount of an alkali metallic hydridoaluminate, and carrying out solid-liq. separation. CONSTITUTION:Waste liquor contg. a silver salt such as...
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| creator | YAMAKAWA ISAO OHASHI HITOSHI FUJIWARA SAIJIRO HARADA KOICHI TAKASUGI TAKESHI KIYOTA TOYOAKI |
| description | PURPOSE:To recover economically and efficiently silver from waste liquor contg. a silver salt by adjusting the waste liquor to a specified pH, adding a small amount of an alkali metallic hydridoaluminate, and carrying out solid-liq. separation. CONSTITUTION:Waste liquor contg. a silver salt such as a spent photographic fixing soln. is adjusted to 4-=about 30min to carry out reduction treatment. After finishing reduction, precipitated silver is recovered by solid-liq. separation. |
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CONSTITUTION:Waste liquor contg. a silver salt such as a spent photographic fixing soln. is adjusted to 4-<8pH by adding a basic compound such as ammonia or NaOH, and at least one kind of compound selected among alkali metallic hydridoaluminates such as lithium aluminum hydride and alkali metallic hydridoborates potassium borohydride is added to the waste liquor by about 0.4-1.5mol per 1mol silver in the waste liquor. The waste liquor is then stirred at 5-100 deg.C for >=about 30min to carry out reduction treatment. 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CONSTITUTION:Waste liquor contg. a silver salt such as a spent photographic fixing soln. is adjusted to 4-<8pH by adding a basic compound such as ammonia or NaOH, and at least one kind of compound selected among alkali metallic hydridoaluminates such as lithium aluminum hydride and alkali metallic hydridoborates potassium borohydride is added to the waste liquor by about 0.4-1.5mol per 1mol silver in the waste liquor. The waste liquor is then stirred at 5-100 deg.C for >=about 30min to carry out reduction treatment. 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CONSTITUTION:Waste liquor contg. a silver salt such as a spent photographic fixing soln. is adjusted to 4-<8pH by adding a basic compound such as ammonia or NaOH, and at least one kind of compound selected among alkali metallic hydridoaluminates such as lithium aluminum hydride and alkali metallic hydridoborates potassium borohydride is added to the waste liquor by about 0.4-1.5mol per 1mol silver in the waste liquor. The waste liquor is then stirred at 5-100 deg.C for >=about 30min to carry out reduction treatment. After finishing reduction, precipitated silver is recovered by solid-liq. separation.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | AUXILIARY PROCESSES IN PHOTOGRAPHY CHEMISTRY CINEMATOGRAPHY ELECTROGRAPHY FERROUS OR NON-FERROUS ALLOYS HOLOGRAPHY METALLURGY 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 TREATMENT OF ALLOYS OR NON-FERROUS METALS TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE |
| title | METHOD FOR RECOVERING SILVER |
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