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http://dx.doi.org/10.4150/KPMI.2018.25.3.232

Study on the Recovery Silver and Nanoparticles Synthesis from LTCC By-products of Lowly Concentrated Silver  

Joo, Soyeong (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE))
Ahn, Nak-Kyoon (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE))
Lee, Chan Gi (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE))
Yoon, Jin-Ho (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE))
Publication Information
Journal of Powder Materials / v.25, no.3, 2018 , pp. 232-239 More about this Journal
Abstract
In this paper, the recovery and nanoparticle synthesis of Ag from low temperature co-fired ceramic (LTCC) by-products are studied. The effect of reaction behavior on Ag leaching conditions from the LTCC by-products is confirmed. The optimum leaching conditions are determined to be: 5 M $HNO_3$, a reaction temperature of $75^{\circ}C$, and a pulp density of 50 g/L at 60 min. For the selective recovery of Ag, the [Cl]/[Ag] equivalence ratio experiment is performed using added HCl; most of the Ag (more than 99%) is recovered. The XRD and MP-AES results confirm that the powder is AgCl and that impurities are at less than 1%. Ag nanoparticles are synthesized using a chemical reduction process for recycling, $NaBH_4$ and PVP are used as reducing agents and dispersion stabilizers. UV-vis and FE-SEM results show that AgCl powder is precipitated and that Ag nanoparticles are synthesized. Ag nanoparticles of 100% Ag are obtained under the chemical reaction conditions.
Keywords
Silver; Recovery; Leaching process; Silver nanoparticle; Chemical Reduction Method;
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