Application of kinetics models on gold cementation by zinc from tiosulphate and ammonia solutions
DOI:
https://doi.org/10.3989/revmetalm.2005.v41.iExtra.1001Keywords:
Gold, Zinc, Cementation, Tiosulphate, Ammonia, KineticsAbstract
Being thiosulphate leaching of gold one of the proposed alternatives to conventional cyanide leaching of several gold ores, different approaches for metal recovery from pregnant thisulphate solutions had been considered and from these, gold cementation by zinc had not been widely study. In the present work, several kinetics models had been tested on experimental results of gold cementation by powdered zinc, and under varying conditions results are best fitted to the passivation model. Overall, the cementation of the precious metal by zinc from ammoniacal thiosulphate solutions was concluded to be under mass transfer control, higher temperatures and pH/ammonia concentration were established to positively affect the rate of gold cementation.
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