Cyanide analysis for complex cyanide solutions

CIM Journal, Vol. 4, No. 2, 2013
W. van der Merwe Measurement and Control Division, MINTEK Randburg, South Africa P. Breuer Parker CRC for Integrated Hydrometallurgy Solutions, CSIRO Minerals Down Under National Research Flagship, CSIRO Process Science and Engineering, Australia

With the gold industry processing more complex ores, the online
measurement and control of cyanide addition to the gold leaching circuit has
become more critical.  This paper
compares the two commonly employed ‘free’ cyanide online analysis methods
(amperometric and potentiometric endpoint silver nitrate titration) with the
rhodanine endpoint silver nitrate titration and ion selective electrode methods
common at site laboratories.  Measurement differences between these
methods are presented and discussed for cyanide solutions containing copper and
zinc with varying cyanide to metal ion ratios.  The resulting cyanide available to leach
gold is also compared using these measurement techniques.
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