Nano-microbubble flotation of fine and ultrafine chalcopyrite particles
By R. Ahmadi, D. Khodadadi, M. Abdollahy, M. Fan. 2014
225 citations recorded by the source corpus.
Abstract 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 (nanobubbles and microbubbles) on the flotation of fine (−38 + 14.36 μm) and ultrafine (−14.36 + 5 μm) 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 understand 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 nanobubble 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.
Subfields: Biomedical Engineering, Mechanical Engineering, Water Science and Technology
View Paper: https://www.semanticscholar.org/paper/a10ead9fcc5f54bada0578f4a30ead6c6ebe6e9f
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In Biomedical Engineering
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Citations in the corpus
- Nanobubbles: Generation using a multiphase pump, properties and features in flotation (2017, background): “Their technological potential in several areas is now recognized, including advanced flotation to remove aqueous pollutants and enhance mineral fines values (Ahmadi et al., 2014; Fan et al., 2012, 2010a, 2010b; Sobhy and Tao, 2013).”
- Flotation of quartz particles assisted by nanobubbles (2015, background): “In addition, a number of recent studies have reported some advantages in mineral flotation in the presence of nanobubbles (Fan and Tao, 2008; Fan et al., 2010a, 2010b, 2010c, 2013; Rahman et al., 2014; Sobhy, 2013; Sobhy and Tao, 2013a, 2013b).”