The invention relates to a
beneficiation process for increasing the
recovery rate of gold of
refractory gold ores. According to the process, a reselection-floatation-reselection combined procedure is adopted to increase the
recovery rate of the gold, and in other words, ores are ground till the particle size is -0.074 mm(60-80)%; a hydraulic power classifier is firstly utilized for classification, coarse gold concentrate is obtained from classified setting sand through a reselection method, and reselected
tailings return to a
ball mill to be ground
gain; and classified overflow adopts a total-
sulfur flotation method to recycle the gold, mustard gold concentrate is obtained, flotation
tailings are reselected through a Nilson centrifugal ore separator, and obtained reselected concentrate returns to the
ball mill to be ground
gain.
Early recovery and much
recovery of the gold can be achieved through the process, gold which cannot be recycled because the particle size is too large or too small in total-
sulfur flotation is effectively recycled, the purpose of selective ore
grinding is achieved through reselection-
ball mill closed cycle, the dissociation degree of the ores can be improved easily, the grade of the gold concentrate is remarkably improved, the
metal recovery rate is remarkably increased, and good
economic benefits can be brought to enterprises.