Analysis of Complexing and Adsorption Properties of Dithiocarbamates Based on Cyclic and Aliphatic Amines for Gold Ore F
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MINERAL DRESSING
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Analysis of Complexing and Adsorption Properties of Dithiocarbamates Based on Cyclic and Aliphatic Amines for Gold Ore Flotation T. N. Matveevaa*, N. K. Gromovaa, and L. B. Lantsovaa a
Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Moscow, 111020 Russia *e-mail: [email protected] Received March 16, 2020 Revised March 18, 2020 Accepted April 10, 2020
Abstract—The authors find that morpholine dithiocarbamate (MDTC) and S-cyanoethyl N, N-diethyl dithiocarbamate (CEDETC) are capable to form stable compounds with gold in the solution and to form an adsorption layer on the surface of gold-bearing sulphides, which points at them as new selective collectors for gold recovery from rebellious ore. The coating area of MDTC on the surface of chalcopyrite, arsenopyrite and pyrite, with new discrete growths is quantitatively assessed. CEDETC improves floatability of chalcopyrite by 1.5–2.0 times as against butyl xanthate at low consumption of reagents, while difference in floatability of chalcopyrite and arsenopyrite considerably grows, which is indicative of a beneficial effect on production of Au–Cu concentrates with lower As content by flotation. Keywords: Gold ore, chalcopyrite, arsenopyrite, flotation, dithiocarbamates, adsorption, complexing. DOI: 10.1134/S1062739120026745
INTRODUCTION
New types of mineral raw materials involved into operation and more complete recovery of valuable components from complex gold-bearing ores is possible when creating up-to-date technologies, which provide a cost-effective increase in the production of noble metals. Creation of effective reagents and flotation modes for processing fine classes of gold and selective reagents for depressing associated minerals has been recognized as an innovative solution to increasing the recovery of noble metals by flotation concentration. The investigations are carried out using X-ray phase and spectral analyses, UV-spectroscopy, potentiometry, measuring the force of an air bubble separation from mineral surface, scanning electron and laser microscopy, monomineral and ore flotation on natural and artificially concentrated gold-bearing minerals. The possibility of more complete recovery of gold and nonferrous metals into concentrates while reducing their losses with waste concentration products is relevant for creating new effective reagents [1–8]. The studies on the development of new reagents conducted at the Institute of Comprehensive Exploitation of Mineral Resources, RAS showed that DMDC and DEDC were effective collectors for gold recovery from rebellious ore. The reagents belonging to this dithiocarbamate class are more selective than xanth
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