METHOD OF UPGRADING OF THE SULFIDE POLYMETALLIC GOLD-CONTAINING ORES AND THE PRODUCTS Russian patent published in 2008 - IPC B03D1/02 

FIELD: gold-mining industry; methods of minerals dressing.

SUBSTANCE: the invention is pertaining to the method of the minerals dressing and may be used at reprocessing of the sulfide polymetallic gold-containing ores and at the additional recovery of the precious and non-ferrous metals from the stored wastes of the ore-dressing and processing enterprises. The method allows to exclude the losses of gold with pyrite. The method provides for the collective sulfide flotation in the alkaline condition in the presence of the xanthogenate and the foaming agent with production of the collective concentrate and the tailings, the subsequent selective flotation of the collective concentrate with production of the commercial concentrates and the pyrite product. The tailings of the collective sulfide flotation and-or the pyrite product of the selective flotation are categorized in the three-product hydrocyclone with the re-grinding of the sands of the hydrocyclone, then exercise in the presence of the xanthogenate at рН=5.4-5.6 the flotation of the reground sands and the middle drain of the hydrocyclone at concentration of xanthogenate up to 6 mg/l. The foam product produced as the a result of the flotation is routed for reprocessing for extraction of the gold from it.

EFFECT: the invention allows to exclude the gold with pyrite losses.