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Separation of Ag(I) by Ion Exchange and Cementation from a Raffinate Containing Ag(I), Ni(II) and Zn(II) and Traces of Cu(II) and Sn(II)

1
Department of Advanced Material Science & Engineering, Institute of Rare Metal, Mokpo National University, Jeollanamdo 534-729, Korea
2
Department of Chemical and Biomolecular Engineering, Seonam University, Chonbuk 31556, Korea
*
Author to whom correspondence should be addressed.
Processes 2018, 6(8), 112; https://doi.org/10.3390/pr6080112
Received: 10 July 2018 / Revised: 20 July 2018 / Accepted: 29 July 2018 / Published: 1 August 2018
(This article belongs to the Section Chemical Systems)
Ion exchange and cementation experiments were done to separate silver(I) from a raffinate containing silver(I), nickel(II), and zinc(II) and small amounts of copper(II) and tin(II). The raffinate resulted from the recovery of gold(III), tin(II) and copper(II) by solvent extraction from a leaching solution of anode slime. Ion exchange with anionic resins was not effective in separating silver(I) because tin(II) and zinc(II) were selectively adsorbed into the anionic resins. It was possible to separate silver(I) by cementation with copper sheet. Treatment of the cemented silver with nitric acid solution increased the purity of silver(I) in the solution from 50.9% to 99.99%. Adjusting the pH of the AgNO3 solution to higher than 6, followed by adding ascorbic acid as a reducing agent, led to the synthesis of silver particles with micron size. View Full-Text
Keywords: silver; ion exchange; cementation; copper sheet; silver particles silver; ion exchange; cementation; copper sheet; silver particles
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Xing, W.D.; Lee, M.S.; Choi, S.H. Separation of Ag(I) by Ion Exchange and Cementation from a Raffinate Containing Ag(I), Ni(II) and Zn(II) and Traces of Cu(II) and Sn(II). Processes 2018, 6, 112.

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