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Nano-microbubble flotation of fine and ultrafine chalcopyrite particles

International Journal of Mining Science and Technology 2014年第4期24卷 559-566页

作者： ahmadi Rahman khodadadi darban ahmad Abdollahy Mahmoud Fan Maoming Department of Mineral Processing Engineering Tarbiat Modares University EFD Eriez Manufacturing Co.

As is well known to mineral processing scientists and engineers, fine and ultrafine particles are difficult to float mainly due to the low bubble-particle collision efficiencies. Though many efforts have been made to improve flotation performance of fine and ultrafine particles, there is still much more to be done. In this paper, the effects of nano-microbubbles （nanobuhbles and microbubbles） on the flotation of fine （-38 ＋ 14.36 μm） and ultrafine （-14.36 ＋ 5μm） chalcopyrite particles were investigated in a laboratory scale Denver flotation cell. Nano-microbubbles were generated using a specially-designed nano- microbubble generator based on the cavitation phenomenon in Venturi tubes. In order to better under- stand the mechanisms of nano-microbubble enhanced froth flotation of fine and ultrafine chalcopyrite particles, the nano-microbubble size distribution, stability and the effect of frother concentration on nano- bubble size were also studied by a laser diffraction method. Comparative flotation tests were performed in the presence and absence of nano-microbubbles to evaluate their impact on the fine and ultrafine chalcopyrite particle flotation recovery. According to the results, the mean size of nano-microbubbles increased over time, and decreased with increase of frother concentration. The laboratory-scale flotation test results indicated that flotation recovery of chalcopyrite fine and ultrafine particles increased by approximately 16-21% in the presence of nano-microbubbles, depending on operating conditions of the process. The presence of nano-microbubbles increased the recovery of ultrafine particles （-14.36 ＋ 5 μm） more than that of fine particles （-38 ＋ 14.36 μm）. Another major advantage is that the use of nano-microbubbles reduced the collector and frother consumptions by up to 75% and 50%, respectively.

关键词： Nanobubbles Nano-microbubble Bubble size distribution Chalcopyrite Froth flotation Fine particles

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Enhancing recovery of uranium column bioleaching by process optimization and kinetic modeling

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Transactions of Nonferrous Metals Society of China 2017年第12期27卷 2691-2703页

作者： H. ZARE TAVAKOLI M. ABDOLLAHY S. J. ahmadI A. khodadadi darban Mining Engineering Department Tarbiat Modares University Tehran 14115116 Iran Nuclear Science and Technology Research Institute Tehran 113658486 Iran

This research aimed to enhance the column bioleaching recovery of uranium ore by Acidithiobacillus *** factors were examined for their significance on bioleaching using a Plackett-Burman factorial *** significant variables([Fe2+]initial,pH,aeration rate and inoculation percent)were selected for the optimization *** effect of these variables on uranium bioleaching was studied using a central composite design(CCD).The optimal values of the variables for the maximum uranium bioleaching recovery(90.27±0.98)%were as follows:[Fe2+]initial=2.89g/L,aeration rate420mL/min,pH1.45and inoculation6%(v/v).[Fe2+]initial was found to be the most effective *** maximum uranium recovery from the predicted models was92.01%.This value was in agreement with the actual experimental *** analysis of bioleaching residue of uranium ore under optimum conditions confirmed the formation of K-jarosite on the surface of *** using optimal conditions,uranium bioleaching recovery is increased at column and jarosite precipitation is *** kinetic model showed that uranium recovery has a direct relation with ferric ion concentration.

关键词： column bioleaching uranium ore screening optimization kinetic model Acidithiobacillus ferrooxidans

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