Comprehensive recovery of a low grade polymetallic gold ore

A gold ore containing gold,silver,lead,iron elements is of the characteristics of complex relationship,fine dissemination grain sizes, low grades and high comprehensive utilization value. First, bulk flotation that grinding fineness was -0.074 mm 60% and xanthate(64g/t) and ammonium dibutyl dithiophosphate (13g/t) were used as collectors was applied and a bulk concentrate containing gold,silver,lead was obtained.Second, gold and silver were recoveried efficiently with the recovery of 67.24% and 38.30% respectively for run-of-mine with cyanide leaching from bulk concentrate on condition that the pH was 11,the pulp density was 40%,the dosages of sodium cyanide was 5kg/t and the leaching time was 36h.Third,while calcium oxide(1500g/t) as suppressant and diethyldithiocarbamate(40g/t) and ammonium dibutyl dithiophosphate(10g/t) as collectors were used,lead flotation test from leaching residue was conducted that lead concentrate (Grade: 45.32%, Recovery rate: 53.98%) was obtained and the recovery of gold,silver was 3.16% and 5.07% respectively and the corresponding total recovery was 70.40% and 43.37% respectively.Finally, magnetic separation from bulk flotation tailings was used through the processing of one stage roughing and one stage cleaning under the condition that magnetic intensity was 111kA/m and iron concentrate (Grade:56.30 %, Recovery rate 12.76%) was obtained. gold,silver,lead,iron elements were recoveried efficiently and separating index was fine through the mineral processing which provides important basis for developing the deposit.