Mechanism of Interaction between Morpholine Dithiocarbamate and Cyanoethyl Diethyldithiocarbamate Reagents and Low-Dimensional Gold on the Surface of Sulfide Minerals in Flotation of Difficult Gold-Bearing Ore
T. N. Matveeva, N. K. Gromova, L. B. Lantsova, O. I. Gladysheva
Academician Melnikov Research Institute of Comprehensive Exploitation of Mineral Resources, Moscow, Russia
Keywords: Sulfide gold-bearing ore, chalcopyrite, arsenopyrite, flotation, xanthate, morpholine dithiocarbamate, cyanoethyl diethyldithiocarbamate
Abstract
Using the methods of UV spectroscopy, potentiometry, laser and electron microscopy, the authors give a scientific ground and prove experimentally the mechanism of interaction between new complexing agents MDTC and CEDETC and low-dimensional gold on the surface of gold-bearing sulfides. The different surface coverage of sulfide minerals with CEDETC ensures selective hydrophobization and effective recovery of micro and nano gold from complex gold-bearing ore. The behavior of the chalcopyrite electrode potential confirms the active chemical adsorption of MDTC with the formation of the strong MDTC-Cu compound and the domination of CEDETC physisorption in the adsorption layer of minerals. The lab-scale testing of a gold-bearing ore sample from Olimpiada deposit shows that the use of MDTC and CEDETC in combination with butyl xanthate ensures the higher quality of the concentrate and the increased gold recovery by 6-7%.
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