Abstract
Silver (Ag) has countless medical and industrial applications, which makes it an attractive area of research. However, Ag, a by-product of gold (Au) extraction, is also a precious metal, which makes it expensive. Waste radiographic films contain significant amounts of Ag that can be recovered either by pyrometallurgy or hydrometallurgy. Current approaches to Ag recovery from waste radiographic films are not cost-effective and harmful to the environment. In this work, Ag particles were recovered from waste X-ray films using oxalic acid by stripping the gelatin layer. XRD and SEM results confirm that Ag was recovered in its metallic form. It was then found that increasing the temperature, oxalic acid concentration and stripping time generally improves the recovery of Ag. Reusability test confirmed that the stripping solution can be reused multiple times. However, the initial Ag recovery of 68.95% decreased to 28.21% after 3 cycles of reuse.
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