Experimental study on pressure oxidation-cyanide leaching for gold recovery from waste circuit boards
Experimental research was conducted on pressure oxidation-cyanide leaching for gold recovery from purchased waste circuit boards,investigating the effects of material fineness,material mass fraction,oxidation tempera-ture,oxidation time,etc.,on the effectiveness of pressure oxidation pretreatment.The experimental results showed that conducting pressure oxidation pretreatment under conditions of material fineness of-0.25 mm accounting for 80%,material mass fraction of 30%,oxygen partial pressure of 2.0 MPa,oxidation temperature of 200 °C,oxidation time of 3.0 h,sulfuric acid dosage of 90 kg/t,and oxidant dosage of 25 kg/t,followed by cyanide leaching under appropriate conditions,resulted in an average gold leaching rate of 92.52%.
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