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光谱、金相等分析的底板和照片在冲洗过程中,感光材料上75%的银盐被溶入定影液,每升充分使用过的这类废液可提取出2～3克纯银,其方法如下: 1 碱析法:用15%浓度的氢氧化钠调废液pH≈9时即出现白色絮状氢氧化银沉淀,加热煮沸,氢氧化银分解为黑色氧化银,后又被溶液中残存的硫代硫酸钠还原为黄白色粉末状单质银,过滤、洗涤,备用。 2 锌粉还原法:在每升废液中加入锌粉5～10克,用电动搅拌器或导人压缩空气搅拌3～4小时,滤
Spectral, gold analysis of the floor and photos In the process of washing, photosensitive materials, 75% of the silver salt is dissolved into the fixing solution, per liter of fully used such waste can be extracted 2 to 3 grams of silver, which The method is as follows: 1 Alkaline analysis: When the pH value of the waste liquor with 15% sodium hydroxide was adjusted to pH9, a white flocculent silver hydroxide precipitate appeared, heated and boiled, the silver hydroxide was decomposed into black silver oxide, Residual sodium thiosulfate is reduced to yellow-white powdery elemental silver, filtered, washed and reserved. 2 zinc powder reduction method: add zinc powder per liter of waste 5 to 10 grams, with electric mixer or guide the compressed air for 3 to 4 hours, filtered