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首页> 外文会议>Materials processing fundamentals 2018 >Leaching Recovery of Silver from Used Radiographic Films
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Leaching Recovery of Silver from Used Radiographic Films

机译：从用过的射线照相胶片中浸出回收银

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A preliminary leaching recovery of silver metal from waste radiographic films with potassium hydroxide (KOH) in a water bath was investigated. The rinsed and cleansed films were sized into squares before being dried in an oven at 20 °C for 30 min. Silver oxide was precipitated with potassium hydroxide at varying concentrations at 90 °C in a water bath by agitated leaching. The leach solutions were filtered and the filtrates obtained analyzed for silver with Atomic Absorption Spectrophotometer. The results obtained showed that the leach liquors assayed 648.27, 984.86 and 1017.82 mg/L for KOH solutions of molar concentrations 0.02, 0.5 and 1.0 M, respectively. The silver oxide precipitate obtained after filtration was also thermally decomposed at 450 °C. Future research will include analysis for the silver content of the residue resulting from thermal decomposition. The study showed that silver metal in waste radiographic films can be leached with potassium hydroxide in a water bath at 90 °C and thus further confirm waste radiographic films as a secondary resource for silver recovery.
机译：研究了在水浴中用氢氧化钾（KOH）从放射线照相胶片中初步浸出回收银金属的方法。将冲洗和清洗过的薄膜定尺寸为正方形，然后在20°C的烤箱中干燥30分钟。在水浴中，通过搅拌浸出，在90°C下用不同浓度的氢氧化钾沉淀氧化银。过滤浸出溶液，并用原子吸收分光光度计分析所得滤液中的银。所得结果表明，对于摩尔浓度为0.02、0.5和1.0 M的KOH溶液，浸出液的含量分别为648.27、984.86和1017.82 mg / L。过滤后获得的氧化银沉淀物也在450℃下热分解。未来的研究将包括分析热分解产生的残留物中的银含量。研究表明，可以在90°C的水浴中用氢氧化钾浸提废放射线照相胶片中的银金属，从而进一步证实废放射线照相胶片是回收银的第二资源。

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