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- W2610073841 abstract "The knowledge of gold deportment in host gangue minerals provides key fundamental understanding of the ores refractoriness, and for the development of apt processing route to enhance productivity and profitability. In this paper, the deportment of gold in two south-eastern Birimian biooxidised flotation concentrates, one noted to display markedly lower gold recovery than the other after cyanidation, has been investigated. The results showed that both feeds are mineralogically complex and comprise mixtures of oxides (quartz, rutile), silicates (muscovite, illite, chamosite, ephesite, larnite), sulphides (pyrite, arsenopyrite), and sulphates (bassanite, gypsum, jarosite) in differing amounts. They remained complex after elimination of selected mineral phases during each diagnostic leaching stage. Whilst sodium carbonate treatment eliminated only the sulphate minerals during diagnostic leaching, nitric acid treatment removed chamosite and larnite alongside the residual sulphide minerals. Furthermore, roasting eliminated ephesite and carbonaceous matter. Alkaline cyanide leaching over 24 h revealed that gold extraction in the concentrates displaying higher and lower gold recoveries were = 69 and = 22 wt.%, respectively. The diagnostic leaching results also showed that the main causes of refractoriness in the lower gold recovery concentrate is the presence of refractory sulphate minerals (jarosite and gypsum) which prevented the recovery of over 40 wt.% Au from the concentrate. Furthermore, both concentrates displayed preg-robbing characteristics which were more pronounced in the concentrate with higher gold recovery. From the results, suppression of secondary sulphate mineral formation during biological oxidation or their elimination thereafter could significantly improve gold extraction efficacy of the present bio-oxidised flotation concentrates." @default.
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- W2610073841 date "2016-01-01" @default.
- W2610073841 modified "2023-09-26" @default.
- W2610073841 title "Unravelling deportment of gold in refractory bio-oxidised flotation concentrates by diagnostic leaching" @default.
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