Industrial pilot plant for gold extraction by ammonia-cyanide leaching process from sulphide ore

摘要

The operation of gold extraction from sulphide ore of Senjedeh mine which includes high grade of copper in ammonia- cyanide system was studied in industrial plant. Entrance feed involved pyrite and chalcopyrite behaves as the host ore of gold. The average of copper grade is 1700 ppm and 2.0 ppm for gold, the average of grind size is 63μ for <80%. The residence time for leaching and preparation is 48 hrs. Based on experimental findings, the consumption of cyanide, Ammonia (18%) and lime on the average is achieved 1.2kg/t , 8L/t and 4 kg/t respectively. The efficiency is obtained 85%. This plant has 30 t/hr tonnages as nominal.