Recovery of cyanide in gold leach waste solution by volat

SETTORE
VARIE
Autori
Gonen N., Kabasakal O. S., Ozdil G.
Titolo
"Recovery of cyanide in gold leach waste solution by volatilization and absorption"
Rivista/Periodico
Journal of Hazardous Materials, 113 (1 - 3) (2004) 233.
Abstract
In this study, the effects of pH, time and temperature in regeneration of cyanide in the leaching
waste solution of gold production from disseminated gold ore by cyanidation process were
investigated and the optimum conditions, consumptions and cyanide recovery values were
determined.
The sample of waste solution containing 156 mg/l free CN– and 358 mg/l total CN–, that was
obtained from Gumushane - Mastra/Turkey disseminated gold ores by cyanidation and carbon - in
- pulp (CIP) process under laboratory conditions was used in the experiments. Acidification with
H2SO4, volatilization of hydrogen cyanide (HCN) with air stripping and absorption of HCN in a basic
solution stages were applied and under optimum conditions, 100% of free cyanide and 48% of
complex cyanide and consequently 70% of the total cyanide in the liquid phase of gold leach
effluent are recovered.
Keywords
Gold leach; cyanide waste solution; cyanide removal; cyanide recovery; regeneration.
Riassunto
In questo studio sono analizzati gli effetti di pH, tempo e temperatura nel recupero dei cianuri dalle
soluzioni di scarto per la produzione dell’oro a partire da minerali auriferi tramite processi di
cianurazione. Vengono individuate le condizioni ottimali e determinate le quantità di cianuro
recuperato. Con questo metodo sono stati recuperati il 100% del cianuro libero e il 48% di quello
complessato con una resa totale del 70%.
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