Effect of Mechanical Activation on the Kinetics of Ammoniacal Thiosulfate Leaching of a Refractory Oxide Gold Ore

سال انتشار: 1398
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 118

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شناسه ملی سند علمی:

JR_IJMSEI-16-2_007

تاریخ نمایه سازی: 1 اسفند 1401

چکیده مقاله:

The effect of mechanical activation on the kinetics of ammoniacal thiosulfate leaching of a refractory oxide gold ore containing ۲.۸ ppm Au was investigated. The gold extraction of ۹۹.۸۱% was achieved by ۱۶ h leaching of a sample mechanically activated for ۶۰ minutes. The gold extraction observed for a similar reference sample without mechanical activation was only ۵۵%. Studies revealed that leaching progresses at two different rates depending on the leaching time (۰-۲ h and ۲-۱۶ h). It was observed that diffusion through an ash layer as a dominant mechanism controls the leaching of samples mechanically activated up to ۴۵ minutes during total leaching time, while reaction control and liquid film diffusion are dominant mechanisms for leaching of a sample mechanically activated for ۶۰ minutes during ۰-۲ h and ۲-۱۶ h, respectively. The extraction observed during the ash diffusion step depends significantly upon mechanical activation time.  Mechanical activation of ۶۰ minutes results in high gold extraction in this step which when combined with subsequent chemical reaction gives close to ۱۰۰% gold extraction in a ۱۶ hour leach.  Mechanical activation for up to ۴۵ minutes leads to a modest improvement in overall gold extraction compared with the reference test without mechanical activation

نویسندگان

E. Mohammadi

Hamedan University of Technology

M. Pourabdoli

Hamedan University of Technology

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