"Determination Of Cyanide Using A Simple And Versatile Process Analyser"
Process Control Qual.
1992 Volume 3, Issue 1-4 Pages 173-183
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M.J.C. Taylor, D.E. Barnes, G.D. Marshall, D.R. Groot and S.J.S. Williams
Abstract:
The monitoring of available cyanide in the leaching and adsorption circuits of Au extraction plants is important to reduce cyanide consumption while ensuring efficient Au recovery. The development of a robust and compact process cyanide analyzer. from a bulky laboratory version is described. The detector cell consisted of a cyanide-selective AgI - Ag2S electrode and a miniaturized Ag - AgCl reference electrode and was used in conjunction with a sequential injection manifold. Filtered sample solution and carrier solution (19 mM sodium carbonate - 5 mM sodium hydrogen borate - 22 µM-ethylenediamine - 2.5 mg L-1 CN-) were drawn into a holding tube and the mixture was transferred to the detector cell. Free cyanide was determined in the range 1 to 200 mg L-1 with a detection limit of 0.5 mg L-1 and a coefficient of variation of 0.028 at 100 mg l-1. The sampling frequency was 45 h-1.
Cyanide
Process liquor
Process monitoring
Sequential injection
