| In order to improve the efficiency of resource utilization and realize the comprehensive utilization of secondary resources, the present tests were carried out to recover gold and silver effectively from lead-silver residue as a secondary resource. The content of gold and silver in the lead-silver residue was high, with the silver being at 245 g/t in the form of copper blue and silver sulfide minerals，and gold being at 1.52 g/t. Based on the state of silver, a hydrothermal leaching-flotation process was used. The involved condition experiments showed that a great enrichment rate of gold and silver in the slag was achieved when the liquid-solid ratio was 2:1 at 70℃ for 2 h in hydrothermal leaching procedure. The flotation included grinding, one roughing, two cleaning, one scavenging of aclosed-circuit process. The chemicals used in flotation procedure were T19 at a dose of 4000 g/t, copper sulfate at a dose of 600 g/t, ester-30 at a dose of 500 g/t. After leaching-flotation, silver was concentrated to a content of 3805 g/t with a recovery rate of 86.82% while gold to a content of 25.8 g/t with the recovery being up to 94.96%. |
