Influence of gold content on copper oxidation from silver-gold-copper alloys |
| |
Authors: | D R Swinbourne G G Barbante A Strahan |
| |
Affiliation: | (1) Monash University, Melbourne, Australia |
| |
Abstract: | In the final stages of the smelting of copper anode slimes, a silver alloy, known as “doré,” is produced. Oxidation refining
is used to remove copper since this element interferes with subsequent electroparting of the small amounts of gold and platinum
group metals in the doré. The gold content of doré can be greatly increased by gold scrap additions and this may affect the
minimum achievable copper content of doré. In this work, silver-gold-copper alloys were oxidized by injecting pure oxygen
at 1100 °C in the absence of any slag cover. For the gold contents expected in practice, the equilibrium copper content of
the doré did not increase significantly as the gold content increased. However, at the other extreme of composition, the equilibrium
copper content was a very strong function of the silver content of the gold bullion. The activity coefficient of copper in
silver-gold alloys was calculated and compared to those predicted from a ternary subregular solution model of the system Ag-Au-Cu.
Satisfactory agreement was found. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|