Comparison Of Different Extraction Methods To Determine Gold In Geological Samples

Páginas: 2 (484 palabras) Publicado: 2 de julio de 2012
Journal of Scientific & Industrial Research
Vol. 65, January 2006, pp. 65-67

Comparison of different extraction methods to determine gold in
geological samples
P V Sunder Raju*
NationalGeophysical Research Institute, Hyderabad 500 007
Received 03 May 2005; revised 25 August 2005; accepted 14 October 2005
Different petro-chemically varied lithological samples were collected from theChitradurga schist belt, Karnataka, to
identify auriferous zones. The efficiencies of gold estimation at very low levels by different extraction methods were
compared. The extraction methods werefire-assay (FA), cyanide leach, and methyl isobutyl ketone (MIBK) solvent
extraction. The rock samples include banded iron formations (silicate, oxides, carbonate and sulphide facies), ferruginous
cherts,massive milky white quartz veins and highly sheared fractured translucent dark grey to bluish grey quartz veins.
After separation and pre-concentration of gold, MIBK solvent extraction procedureshave been studied using flame atomic
absorption spectrophotometer (F-AAS).
Keywords: Chitradurga, F-AAS, MIBK
IPC Code: C22B11/00

Introduction
In nature, gold occurs as native or refractory type.Refractory gold ores are not free milling and cannot
be leached without some form of physical, chemical
or pyro metallurgical pretreatment. Refractory gold is
found in association with sulphides(pyrite,
arsenopyrite and chalcopyrite), whereas native gold is
associated with tellurides, bismuthides, silver,
antimony and copper. In general, fire-assay (FA),
cyanide leach, open aquaregia andmicrowave
(closed) are some of the important extraction
methods. The present study is an attempt to find any
difference in the Au content of the splits of large
sample after crushing, tounderstand the efficiency of
the analytical methods based on aquaregia leach,
NaCN leach and methyl isobutyl ketone (MIBK)
extraction, and compare these methods with the
classical and widely accepted...
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