Karaganda State Technical University, Republic of Kazakhstan:

R. T. Sherembaeva, Senior Lecturer, e-mail: rimkesh_62@mail.ru
N. K. Omarova, Assistant Professor
B. B. Akimbekova, Assistant Professor

Subsidiary of Zh. Abishev Chemical-Metallurgical Institute, Republic of Kazakhstan:
A. A. Mukhtar, Head of Ore-Dressing Laboratory

Laboratory investigations with definition of hydrophobic behavior of the surface of copper-sulfide minerals of bornite and chalcopyrite were carried out by differential-thermal analysis. IR spectrums of these mineral samples were investigated before and after experiments. Mineral hydrophobic behavior was investigated by differential-thermal analysis. Mineral samples (chalcopyrite and bornite), processed at the room temperature by reagents (water, butyl xanthate, anabasinium-O,O-dimethylthiophosphate, N-morpholinylvinegar acid N-phenylthiosemicarbazide) were taken for investigations. The best indicators of reagent adsorption on mineral surface may be defined by the type of infrared radiation absorption by copper sulfide minerals. Chalcopyrite surface processing by reagents (anabasinium-O,O-dimethylthiophosphate and N-morpholinylvinegar acid N-phenylthiosemicarbazide) defined the hydrogen bond weakening and adsorbed moisture evaporation. Processed chalcopyrite has such effect with lower temperature, in contrast to the experiments with the minerals, which were not processed by reagent. This corresponds about the increasing of hydrophobic behavior of chalcopyrite surface, in comparison with bornite. Nonfrothing flotation of monomineral fraction of sulfide minerals was investigated in Hallimond tube. Butyl xanthate, anabasinium-O,Odimethylthiophosphate and N-morpholinylvinegar acid N-phenylthiosemicarbazide were applied as flotation reagents. Monomineral fractions of bornite and chalcopyrite (coarseness is –0.074 mm; mass is 0.5 g) were investigated.

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