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Preparation of Pure Silver Powders by using Mechanochemical Process  

Lee, Jaer-Yeong (Div. of Minerals and Materials Processing Korea Institute of Geoscience and Mineral Resources)
Tung Le, M. (Graduate School of Engineering, Chung-Nam National University)
Ahn, Jong-Gwan (Div. of Minerals and Materials Processing Korea Institute of Geoscience and Mineral Resources)
Kim, Jong-Oh (Graduate School of Engineering, Chung-Nam National University)
Chung, Hun S. (Div. of Minerals and Materials Processing Korea Institute of Geoscience and Mineral Resources)
Kim, Byoung-Gyu (Div. of Minerals and Materials Processing Korea Institute of Geoscience and Mineral Resources)
Publication Information
Resources Recycling / v.15, no.5, 2006 , pp. 33-37 More about this Journal
Abstract
An equal-molar mixture of silver chloride (AgCl) and copper (Cu) was ground in atmosphere conditions using a planetary ball mill to investigate mechanochemical (MC) reaction for preparation of silver powders. The reaction causes the mixture of AgCl and Cu to change the composition of the mixture, such as silver (Ag) and cuprous chloride (CuCl). Through the leaching with ammonium hydroxide solution (1 mol), CuCl can be separated from MC product, so that pure Ag powders can be obtained as the final product. Moreover, polyvinylpyrrolidone (PVP) was used as the additive not only to improve dispersion of Ag pow- der during MC process, but also to control surface oxidation of Ag powders, prepared as the final product.
Keywords
Mechanochemical process; Silver powder; Polyvinylpyrrolidone; Ammonium hydroxide;
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