TMS 2010 Annual Meeting Supplemental Proceedings on Materials Processing and Properties, Washington, United States Of America, 14 - 18 February 2010, pp.473-478
A chemical processing scheme was adopted to recover silver from waste radiographic films. The films were subjected to 1 M nitric acid solution for 3.5 hours at 80 degrees C. The silver nitrate solution was then treated by two different methods. The first involved cementation with iron and zinc powders. These cementators were compared to each other with respect to purity of the final product and the recovery efficiency. The second method was sodium hydroxide precipitation. The treatment with Fe and Zn powders resulted in the formation of metallic silver in just one step; silver oxide obtained via NaOH precipitation was subsequently treated by a method: a treatment with a mixture of glucose and NaOH to yield metallic silver. With the exception of the powder produced by glucose reduction, all the other powders would easily find industrial application.