Effect of Gangue Minerals on Hydrophobic Recovery of Gold

Autor:	Jamidu H. Y. Katima, Henry T. Kimweri, Anderson E. L. Mlaki
Rok vydání:	2013
Předmět:	Gold mining business.industry Potassium chemistry.chemical_element Mineralogy engineering.material chemistry.chemical_compound chemistry Reagent engineering Gangue Pyrite Xanthate business Quartz Nuclear chemistry Lime
Zdroj:	Engineering. :316-321
ISSN:	1947-394X 1947-3931
DOI:	10.4236/eng.2013.53043
Popis:	In this paper, the effect of gangue minerals on the hydrophobic recovery of gold is being investigated using ores obtained from the active small scale gold mining sites in Tanzania. Gold ores of different gangue contents were tested. The effects of silica gangue and high sulphide gangue on gold attachment were examined including the effect of surface activators (potassium amyl xanthate) and the possibility of depressing the effects of gangue using reagents. The results were evaluated in terms of gold recovery, volumes and grade of concentrates formed. There was no change in gold recoveries when the amount of oxide gangue (quartz) in the ore was increased, indicating absence of competition between gold and quartz gangue. High sulphide contents in the ore above 6% reduced gold recoveries considerably. It was noted that potassium amyl xanthate surfactants increased the attachment of both gold and the sulphide gangue. Using lime at pH 10 it was possible to depress the sulphide gangue which is mainly pyrite and hence increased gold recoveries considerably.
Databáze:	OpenAIRE
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