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Study on the Effect of Ultrasonic for Elution of Gold from Gold-loaded Carbon
Author(s): 
Pages: 32-36
Year: Issue:  3
Journal: Precious Metals

Keyword:  physical chemistrygold-loaded carbonethanolultrasonicelutionradicals;
Abstract: Based on the system of ethanol distillation elution without adding cyanide, ultrasonic was used to desorb gold from gold-loaded carbons to explore the function of ultrasonic on the process of gold desorption. The results indicated that mechanical and physical functions of ultrasonic have little effects on desorption of gold. At the mild condition (temperature<70℃), ethanol and NaOH could significantly accelerate the formation of radicals. It might promote the production of radicals in desorption solution, and ethanol and NaOH formed the secondary radicals by capturing the primary radicals leading to the reduction of dissolved oxygen and the increase of reductibility in elution solution. When the temperature is close to the boiling temperature of eluting solution, both ethanol and NaOH could not promote the rate of gold elution, and it indicates that the ultrasonic and temperature increase have similar effects on the desorption process of gold.
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