Analysis of Surface of Sulfides during Interaction with Pseudomonas Japonica
N. K. Algebraistova1, E. S. Ananenko1, M. I. Teremova2, I. S. Plotnikov1, I. V. Prokop’ev3
1Siberian Federal University, Krasnoyarsk, Russia
2Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia
3North-Eastern Federal University, Yakutsk, Russia
Keywords: Sulfide mienrals, arsenopyrite, antimonite, flotation, hydrophobic properties, bacteria Pseudomonas Japonica, biotechnology, selection
Abstract
The modified surface of sulfide minerals (arsenopyrite and antimonite) after bio-treatment with bacteria Pseudomonas Japonica is studied using electroacoustic spectrometer Dispersion DT-310, scanning electron microscope Tescan Vega II SBH, digital technologies and DSA20 EasyDrop unit. It is found that bio-treatment leads to substantial hydrophilization of the mineral surface, which is confirmed by an increase in the wetting angle by 40-50° and in the work of adhesion by 2 times. It is found that the electrochemical properties of the mineral surface also change, including the sign reversal of the ζ -potential and the increase of the electric conductance by an order of magnitude. The scanning electron microscopy proved adsorption of the bacterial cells at the mineral surface. The proof tests confirmed efficiency of the bio-treatment and show reduction in flotation of sulfides by 15-17% in their joint feed with xanthate. The studies display the promising nature of the micro-biological treatment of sulfides before selective flotation.
|
