Kinetics of simultaneous recovering of Au and Ag from CTs by chloridizing volatilization methods

Cyanide tailings (CTs), which amount to hundreds of millions tons and pose significant a danger the environment's ecology, are regarded as hazardous waste. This study suggests an efficient environmentally favorable method for recovery gold silver from CTs. The influence calcium chloride dosage, silicon dioxide pellet moisture content, roasting temperature, duration on chloridizing volatilization Au Ag was investigated. simultaneous cyanide via heating with chlorination also It found that dosage temperature increase rates, while particle content decrease it. inter-diffusion through gangue layer served rate-limiting phase in kinetics, based shrinking core model. apparent activation energies (Ea) 24.01 kJ•mol-1 (Au) 24.62 (Ag) agreement this result. orders reaction corresponding various values dioxide, dosages were computed. Semi-empirical equations can be used describe rate diffusion-controlled processes.