DBPapers
DOI: 10.5593/sgem2011/s04.113

GOLD EXTRACTION FROM HYDROCHLORIC SOLUTION BY DBC: KINETICS PARAMETERS

AUTHOR/S: S. JAVANSHIR, M. ABDOLLAHY, H. ABOLGHASEMI
Monday 1 August 2011 by Libadmin2011

11th International Multidisciplinary Scientific GeoConference SGEM2011, www.sgem.org, SGEM2011 Conference Proceedings/ ISSN 1314-2704, June 20-25, 2011, Vol. 1, 1147-1154 pp

ABSTARCT

Modern hydrometallurgical techniques have been adopted to produce high-purity gold.
Many extractants were used for the extraction of gold from synthetic solution but
Dibutyl Carbitol (DBC) had a unique superiority. In this paper, the influence of kinetics
parameters such as agitation time, [AuCl4]- and DBC concentration, temperature,
stirring speed and interfacial area , type of impeller on the gold extraction were
investigated in Lewis cell (L.C.) technique. The results indicated that gold recovery
could reach to 95% at 150 rpm during 10 minutes. Also the effects of two types of
impeller (2-blad, 4-blade) on extraction were compared. It was clear that in the same
conditions, extraction percent has been increased at least 8 % more by 4- blade with
respect to 2- blade. Studying of species concentration such as gold in aqueous feed
solution and Dibutyl Carbitol in the organic phase showed that gold extraction percent
was increased from 15% to 25% in 6 minutes when the gold concentration changed
more than 5 times because of high loading capacity of DBC. In addition, the extraction
was increased by increasing of DBC concentration due to the effect of the interfacial
tension within two phases, regularly. The influence of temperature was studied and
activation energy, Ea, was calculated (14.27 kJ mol/l) by using Van’t hoff theory. Ea
value (<20.9 kJ/mol) indicates that the extraction of gold (III) in the investigated system
is controlled by diffusion process. Also it was concluded that improving the gold
extraction by increasing impeller speed and interfacial area confirmed the diffusion
process.

Keywords: Extraction, Gold, DBC, Synthetic solution, Leach solution.

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