关键词: 金银矿石, 浮选, 氰化浸出, 联合流程采

Abstract: A gold-silver ore contains gold 4.80 g/t and silver 565 g/t. The gold mineral is mainly native gold， which exists as the form of independent mineral. Some parts are in the form of microscopy or submicroscopy disseminated in limonite and quartz. Bare gold accounts for 72.29% of total gold， and gold wrapped in iron minerals and silicate minerals account for 22.08% and 5.63% of total gold， respectively； silver minerals mainly exist in the form of argentite with coarser grain size， and silver sulfide accounts for 91.33% of total silver. The contents of native silver and silver chloride are low， which account for only 6.55% and 2.12% of total silver， respectively. In order to realize the high-efficient exploitation and utilization of the gold-silver ores， flotation tests were carried out. The results showed that when the ore fineness is -0.074 mm 74.5%， concentrate with gold grade of 77.19 g/t， gold recovery of 75.58%， silver grade of 11 302 g/t， and silver recovery of 94.02% was obtained by using the one coarse four cleaning two sweeping， the tailing cleaning for one time returning to the flotation process after sweeping； The cyanidation leaching was carried out with the tailing which gold grade is of 1.23 g/t ， silver grade is of 35.45 g/t and a regrinding fineness is of -0.043 mm 86%. The grades of leaching residue are gold 0.10 g/t and silver 17.88 g/t， respectively， and the leaching rates of gold and silver for flotation tailings were 91.87% and 49.56%， respectively. The total recovery rate of gold and silver in the whole process reached 98.01% and 96.98%， respectively.

Key words: Gold-silver ores, Flotation, Cyanidation leaching, Combined process