Re-extraction of gold in the concentrate from waste tailings by flotation method
DOI:
https://doi.org/10.31643/2018/6445.25Keywords:
gold, stale tails, flotation, flotation concentrate, grinding, extraction, material composition.Abstract
Actualization of the work on processing of dead tailings, based on modern methods of enrichment, hydrometallurgy, on the involvement in processing of mineral resources of man-made origin. Currently, the Maikai enrichment,in order to expand the raw materials base and increase the complexity of the use of natural raw materials, conduct intensive geological prospecting for the extraction of gold from hard-to-refractory raw materials. However, due to the fact that the gold-bearing technogenic mineral formation of this field is classified as stubborn, the problem of extracting gold and other precious metals is significant. The results of the study of the material composition of the stale tails of the technogenic mineral formation of the Maikai enrichment factory are presented. It was found that the sample contained 1.46 g / t Au. The content of sulfide minerals is 28.2%, the main sulphides are pyrite (10 %). A significant part of gold (42 %) is in a thin-grained state in sulfides, and also in rock-forming minerals of 12.7%. Optimum reagent flotation regime for sulphide test: the main flotation of butyl xanthate is 120 g / t, T-80 is 72 g / t, control flotation of butyl xanthate is 60 g / t. For the production of flotation concentrates, the most optimal option is the grinding size of 97.02 % of the class -0.040 mm for 20 minutes. Studies on the enrichment by flotation methods have shown that as a result of tailings enrichment in the optimum reagent regime, a concentrate with a gold content of 9.39 g / t is obtained with 82.39 % recovery.
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