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Towards to Extraction of Nanodispersed Noble Metals From Natural Black Graphite Shales

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Author(s): Victor G. Zavodinsky | Alexander I. Khanchuk | Elena A. Mikhailenko

Journal: European Researcher
ISSN 2219-8229

Issue: 1;
Start page: 12;
Date: 2012;
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Keywords: noble metals | graphite shales | accumulation | ab initio simulation

ABSTRACT
A theoretical approach based on the density functional theory and the pseudopotential method was applied to consider diffusion and accumulation of Au, Pt, and Pd in graphite. It is shown that Pt atoms migrate easily inside graphite. They can stop at structure defects and accumulate there, attracting each other and forming plate clusters. Atoms of gold do not penetrate into graphite but link with edge atoms of broken graphite crystallites, forming three-dimensional metallic particles. Palladium behavior is intermediate between platinum and gold. Addition of silicon into graphite can promote the extraction of noble metals because Si atoms force out Pt, Pd, and Au atoms from their bonded states. Last effect can be used as a mechanism of striking off metals from graphite and their extraction from shales
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