Leaching behavior of butanedionedioxime as gold ligand①
(1. The Research Center ofEnvironmental Engineering and Chemical Hi-tech,
Xiangtan Polytechnic University, Xiangtan 411201, P.R.China;
2. Central South University of Technology, Changsha 410083, P.R.China)
Xiangtan Polytechnic University, Xiangtan 411201, P.R.China;
2. Central South University of Technology, Changsha 410083, P.R.China)
Abstract: Butanedionedioxime, a small organic compound with low-toxicity and good chemical stability, has been proposed as an effective gold ligand in gold extraction. The result of experiment shows that: 1) highly effective gold lixiviant can be composed of butanedionedioxime (BDM) with many oxidants, especially potassium permanganate; 2)in the leaching system of BDM-KMnO4the suitable Ox/Lig(ratio of oxidants to gold ligands) range is 0.20~0.50, optimally 0.25~ 0.45 at the pH range of 7~11; 3) BDM-KMnO4extraction of gold from an oxide ore is similar to cyanide(cyanide-O2) extraction, but the leaching rate of gold by BDM-KMnO4is faster than that by cyanide-O2; 4) gold may readily be recovered by carbon adsorption and zinc precipitation.
Key words: gold; leaching; lixiviation