Optimizing Silver Extraction Potential from Waste X-Ray Films Using Acid and Alkaline Leaching Agents

G. Adie, Hakeem O. Shoneye, P. Iniaghe
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引用次数: 1

Abstract

Abstract In this study, the silver extraction potential from waste x-ray films using sodium hydroxide and nitric acid was studied. Sodium hydroxide and nitric acid of different concentrations were used as stripping solutions to determine the optimum leaching concentration. Optimum leaching time and leaching temperature were also investigated by varying the time and temperatures, respectively. The stripped solutions were analysed for silver concentration using Flame Atomic Absorption Spectrophotometer. Results obtained revealed that, for sodium hydroxide stripping, 26.6 mg kg−1 of silver ion was obtained at an optimum leaching concentration, time and temperature of 1.5 M, 900 minutes and 30 °C. For nitric acid stripping, a maximum concentration of 9830.6 mg kg−1 was obtained at optimum concentration, time and temperature of 4 M, 1,440 minutes and 30 °C. The result revealed that the concentration of leaching agent was a significant factor affecting silver recovery, with nitric acid possessing a much higher recovery rate compared to sodium hydroxide.
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酸碱浸出剂对废x射线胶片银萃取潜力的优化
摘要研究了氢氧化钠和硝酸对废x射线胶片中银的萃取潜力。以不同浓度的氢氧化钠和硝酸作为溶出液,确定最佳浸出浓度。通过改变浸出时间和浸出温度,探讨了最佳浸出时间和浸出温度。用火焰原子吸收分光光度计对剥离液中银的浓度进行分析。结果表明,在最佳浸出浓度、浸出时间、浸出温度为1.5 M、900 min、30℃时,氢氧化钠浸出银离子可得26.6 mg kg−1;在最佳浓度、时间、温度为4 M、1440 min、30℃条件下,硝酸溶出的最大浓度为9830.6 mg kg−1。结果表明,浸出剂浓度是影响银回收率的重要因素,硝酸的银回收率远高于氢氧化钠。
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