Use of Aqueous NaOH Solutions to Recover Silver from Radiographic Films

7th International Conference on Advanced Materials and Structures

Cânda, L.^1 ; Ardelean, E.^1 ; Hepu, T.^1 ; Ardelean, M.^1

Politehnica University of Timisoara, Departament Engineering and Management, Revolutiei street no.5, Hunedoara, Romania^1

关键词: Laboratory conditions;    Metallic silver;    Monitored parameters;    NaOH solutions;    Radiographic films;    Silver nitrates;    Silver recovery;    Sodium hydroxide solutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/416/1/012097/pdf
DOI  :  10.1088/1757-899X/416/1/012097

来源: IOP

【 摘 要 】

Radiographic films fall into the category of medical waste, and their management is subjected to special regulations. Still widely used in Romania, radiographic films, are subsequently stored in large quantities; at minimum values of 2g Ag recovered per kilogram of radiographic film, a silver recovery of at least 300kg/year is estimated. In the literature, numerous methods of silver recovery from exposed radiographic films have been approached, of which: leaching by sodium hydroxide solution, using reducing agents in a two steps process and silver nitrate cementation with more active metals. The paper presents the results obtained under laboratory conditions on the recovery of silver using aqueous NaOH solution, running a complete flow of processing, from radiographic films to metallic silver production. There are also presented correlations between the monitored parameters, expressed both analytically and graphically.