A Rotating Disc Study on Silver Dissolution in Concentrate HNO3 Solutions

C. Özmetin

Abstract
In this study, a semi-empirical model was derived for dissolution process of metallic silver in nitric acid solutions. Rotating disc technique was used to study silver dissolution in nitric acid solution as a function of rotating disc speed, reaction temperature, nitric acid concentration and rotating disc surface area. It was determined that the dissolution of silver increased with increasing rotating speed, temperature and disc surface area while it decreased with increasing nitric acid concentration. The activation energy for the dissolution process was found to be 25.552 kJ mol–1. The following semi-empirical model for the process controlled by diffusion was developed by statistical methods: x = 1.7739 ⋅ 10–2 ⋅ ω0.52 ⋅ c–2.4079 ⋅ A0.95 ⋅ e–25552/RT ⋅ t

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Keywords
Rotating disc technique, silver dissolution, nitric acid