Experimental study of the gold recovery from certain cyanidation tailings in Guizhou
Certain cyanide leaching tailings in Guizhou contain1.66 g/t of gold,primarily existing in the forms of exposed gold and sulfide-encapsulated gold.The tailings have a high fineness,with particles of-0.038 mm accounting for over 80%.Given the high slime content of the cyanidation tailings,a sand-slime separation process was employed.Cyclones are used for grading and flotation is performed for the recovery of the underflow and overflow separately.A closed-circuit test with roughing once,scavenging twice,and cleaning three times was conducted,with process parameters and reagent regimes tailored to the characteristics of the underflow and overflow.The sand-slime separation process achieved a concentrate with a gold grade of 12.42 g/t and a gold recovery rate of 50.13%,while the ungraded flotation process of the cyanidation tailings produced a gold concentrate with a grade of 9.49 g/t and a recovery rate of 38.10%.The results indicate that the sand-slime separation process improved the gold grade by approximately 2.9 g/t and the gold recovery rate by about 12 percentage points,effectively recovering gold from the cyanidation tailings.
万方数据
维普
