Gold Recovery Process from Primary and Secondary Resources Using Bioadsorbents

Abstract

Bioadsorbents were prepared in a simple manner only by treating in boiling concentrated sulfuric acid from various biomass materials such as various polysaccharides, persimmon tannin, cotton, paper and biomass wastes such as orange juice residue and microalgae residue after extracting biofuel. These bioadsorbents exhibited high selectivity only to gold over other metals and extraordinary high loading capacity for gold(III), which were elucidated to be attributable to the selective reduction of gold(III) ion to elemental gold due to its highest oxidationreduction potential of gold(III) of metal ions, catalyzed by the surface of bioadsorbents prepared in boiling sulfuric acid. By using these biosorbents, recovery of gold from actual samples of printed circuit boards of spent mobile phones and Mongolian gold ore was investigated. Recovery of trace concentration of gold(I) from simulated spent alkaline cyanide solution was also investigated using the bioadsorbent. Application of bioadsorbents to some recovery processes of gold from cyanide solutions was proposed.

Production of a Highly Concentrated Gold Solution from Aqua Regia Gold Leachate Using Sugarcane Bagasse Nanoparticles

“…polysaccharides, cotton, paper and biomass wastes. Adsorbents generated from these sources have been utilized in gold(III) recovery and are more highly selective when recovering gold compared to other metals [7]. It is highly likely that a nanoparticle (NP) generated from sugarcane (Saccharum Officinarum) bagasse will selectively adsorb gold(III) ions more efficiently than the typically used adsorption gels or activated carbon, probably because the total surface area to volume ratio of the NPs is very high [8].…”