DETERMINATION OF THE OPTIMUM CONDITIONS FOR RECOVERY OF GOLD FROM ZARSHURAN REFRACTORY GOLD SULFIDE ORE

The orthogonal array design has been used to determine the optimum conditions for gold recovery from Zarshuran refractory gold sulfide ore (Iran) by direct cyanidation and roasting-cyanidation. The Taguchi method was used as the experimental design to determine the optimum conditions of dissolution behavior of gold with cyanidation and roasting-cyanidation from Zarshuran refractory gold ore . The experimental conditions were studied in the range of ۱۰–۱۲ for pH, ۲۰-۴۰ for time(h), ۴۰۰-۱۲۰۰ for cyanide content (g/ton) and ۳۰ -۴۰ for percent solid(%). Orthogonal array (OA) L۹ (۳۴) consisting of four parameters each with three levels, was chosen. From this study for direct cyanidation the total optimum gold dissolution (۳۰.۱۱%) obtained at pH (۱۰), Time (۴۰ h), Cyanide content (۸۰۰g/ton) and Percent solid (۳۰%). Also for roasting- cyanidation the total optimum gold dissolution (۳۴.۹۶%) obtained at pH (۱۲), Time (۴۰ h), Cyanide content (۱۲۰۰g/ton) and Percent solid (۳۵%).

Keywords:

Refractory gold ore , Cyanidation , roasting , Taguchi method