[Formation of the third phase and spectroscopic research of the loading organic phases in the gold extraction].

The formation of the third phase during the gold extraction from cyanide solution by quaternary ammonium, tetradecyldimethylbenzylammonium chloride (TDMBAC) was studied by 198Au tracer method. The microstructure of the organic phases was investigated by FTIR, 31P-NMR. With the increasing of gold concentration, aggregations were formed in the gold-loaded organic phase. With the further increasing of gold concentration, the organic phase turned into two layers. Gold, water, and tri-n-butyl phosphate (TBP) were mainly in the down organic phase. In the down layer, distinct O-H stretching vibration peak was found by FTIR; the frequency of P=O stretching vibration shifted to the low frequency; 31P-NMR chemical shift was markedly shifted to the high frequency field. The radius of aggregation was measured by the dynamic laser scattering (DLS) method.