Electro-oxidation as a pre-treatment for gold recovery

Metallurgical recovery of metals from electronic waste: A review

“…Several investigations have been undertaken to determine the effectiveness of chlorine [71][72][73][74][75]. However, chloride leaching of gold is more difficult to apply than cyanide extraction for two major reasons:…”

Characterization and treatment of artisanal gold mine tailings

“…The electroleaching process has several analogies with the electrodyalitic remediation [12]; however, the main objective of this process is the readily dissolution and recovery of the metals, thus it takes place in stirred tanks and often uses sodium chloride as electrolyte [13][14][15][16][17][18][19]. In the electroleaching process, at the anodic surface, the chloride ion (Cl − ) is oxidized to free chlorine (Cl 2 ) while in the cathodic surface, the water reduces with the production of hydrogen (H 2 ) and hydroxyl ions (OH − ).…”

Pretreatment of a refractory arsenopyritic gold ore using hydroxyl ion

“…The recovery of precious metals from refractory ores has been widely investigated due to depletion of the deposits from which gold can be easily leached (Abrantes and Costa, 1996;Ofori-Sarpong et al, 2011). There are numerous causes and degrees for refractory behavior: the presence of carbonaceous matter, passivating films, finely disseminated gold particles in solid solution with the matrix and encapsulated ultrafine gold (Browner and Lee, 1998;Cabri et al, 2000;Chryssoulis et al, 1989;Dunn and Chamberlain, 1997;Marsden and House, 2006).…”