Effect of suspension chemistry onto voltage drop: Application to electro-flotation

Montes-Atenas, Gonzalo; García‐García, Francisco J.; Mermillod-Blondin, Raphaël; Montes, S.

doi:10.1016/j.powtec.2010.06.024

Cited by 12 publications

(6 citation statements)

References 32 publications

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“…Electroflotation has been applied extensively in mineral recovery . Moreover, EF has been found to be an effective method for separating oil and different types of diluted suspended particles in water and wastewater treatment .…”

Section: Methods To Induce Flotationmentioning

confidence: 99%

Flotation: A promising microalgae harvesting and dewatering technology for biofuels production

Ndikubwimana

Chang

Xiao

et al. 2016

Biotechnology Journal

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Microalgal biomass as renewable energy source is believed to be of great potential for reliable and sustainable biofuels production. However, microalgal biomass production is pinned by harvesting and dewatering stage thus hindering the developing and growing microalgae biotechnology industries. Flotation technology applied in mineral industry could be potentially applied in microalgae harvesting and dewatering, however substantial knowledge on different flotation units is essential. This paper presents an overview on different flotation units as promising cost-effective technologies for microalgae harvesting thus bestowing for further research in development and commercialization of microalgae based biofuels. Dispersed air flotation was found to be less energy consuming. Moreover, Jameson cell flotation and dispersed ozone flotation are believed to be energy efficient microalgae flotation approaches. Microalgae harvesting and dewatering by flotation is still at embryonic stage, therefore extended studies with the focus on life cycle assessment, sustainability of the flotation unit, optimization of the operating parameters using different algal species is imperative. Though there are a number of challenges in microalgae harvesting and dewatering, with well designed and developed cultivation, harvesting/dewatering, extraction and conversion technologies, progressively, microalgae technology will be of great potential for biological carbon sequestration, biofuels and biochemicals production.

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Section: Methods To Induce Flotationmentioning

confidence: 99%

Flotation: A promising microalgae harvesting and dewatering technology for biofuels production

Ndikubwimana

Chang

Xiao

et al. 2016

Biotechnology Journal

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“…The results (Figure 3) illustrate that the addition of electroly hances the microbubble-assisted flotation recovery, but when the NaCl con ceeds 0.1 Mม recovery decreases. The addition of an electrolyte to the slurry leads to an increase of the s potential of the bubbles,thus promoting repulsive forces between bubbles [52], however in cases of excess concentration of mineral salts during flota may have a suppressive effect on the recovery of some particles [53], while gation has also been observed [51]. Nevertheless, high electrolyte concent high electrical conductivity, which results in lower voltage values at the sam sity values.…”

Section: Effect Of Electrolyte Concentration On Combined Flotationmentioning

confidence: 99%

“…This leads to lower energy consumption [54]. The addition of an electrolyte to the slurry leads to an increase of the surface electric potential of the bubbles, thus promoting repulsive forces between bubbles and particles [51], however in cases of excess concentration of mineral salts during flotation, the pulp may have a suppressive effect on the recovery of some particles [52], while bubble aggregation has also been observed [50]. Nevertheless, high electrolyte concentration leads to high electrical conductivity, which results in lower voltage values at the same current density values.…”

Section: Effect Of Electrolyte Concentration On Combined Flotationmentioning

confidence: 99%

Enhancing Fines Recovery by Hybrid Flotation Column and Mixed Collectors

et al. 2023

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The froth flotation technique can be considered one of the most efficient methods for the separation of minerals. Prior to utilizing any physicochemical separation method, the size of the mined ore must be decreased to facilitate the release of the valuable materials. This practice, along with the increased exploitation of ores that carry fine mineral particles caused the production of fine and ultrafine particles which are difficult to recover with classical enrichment methods, due to their different characteristics compared to coarser particles. It is established that fine and ultrafine particles are difficult to float, leading to losses of valuable minerals, mainly due to their low collision efficiency with bubbles. Moreover, fine particles require higher reagent consumption due to the fact that have a higher specific area, and finally, their flotation is limited by low kinetic energy. Flotation of fines can be enhanced by either decreasing bubble diameter or increasing their apparent size, or moreover, by enhancing the collector’s adsorption (their hydrophobic behavior) using alternative reagents (non-ionic co-collectors). In the present research, flotation experiments on a hybrid electrolytic flotation column that can produce microbubbles (−50 μm), were carried out for recovering fine magnesite (−25 μm) particles. In addition, the synergistic effect of anionic/non-ionic collectors were studied for the enhancement of fines recovery. Experimental flotation results so far designate the enhancement of fine magnesite particle recovery by approximately 8% with the addition of microbubbles. Finally, the synergistic effect of anionic/non-anionic collectors led to the improvement of flotation recovery by almost 12%.

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“…This is mainly attributed to the fact that micro-bubbles generated by water electrolysis show lower buoyancy and thus longer residence time leading to increased probability of collision with fine particles [31]. However, electroflotation requires high electrical energy, raising the overall costs of the process [32] and rendering the technique restrictive for industrial applications. Alternative forms of energy (e.g., solar power) would lower the energy consumption costs.…”

Section: Introductionmentioning

confidence: 99%

A Hybrid Device for Enhancing Flotation of Fine Particles by Combining Micro-Bubbles with Conventional Bubbles

et al. 2021

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Flotation in the mining industry is a very significant separation technique. It is known that fine and ultra-fine particles are difficult to float, leading to losses of valuable minerals, mainly due to their low collision efficiency with bubbles. Flotation of fine particles can be enhanced either by increasing the apparent particle size or by decreasing the bubble size. Literature review reveals that electroflotation resulted in higher recoveries of ultrafine particles as compared with dispersed-air flotation, because electrolytic bubbles are smaller in size. To this end, the best practical approach is to combine conventional air bubbles and micro-bubbles from water electrolysis. Therefore, the design, fabrication, and operation of a bench-scale micro-bubble generator through water electrolysis is proposed. Moreover, this electrolysis unit is adapted in a mechanical Denver-type flotation cell. The resulting hybrid flotation device is capable of producing bubbles within a wide range of diameters. The significance of this process is that micro-bubbles, attached tothe surface of fine particles, facilitate the attachment of conventional-sized bubbles and subsequently increase the flotation recovery of particles. Experimental flotation results so far on the hybrid device indicate the enhancement of fine particle recovery by approximately 10% with the addition of micro-bubbles.

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Effect of suspension chemistry onto voltage drop: Application to electro-flotation

Cited by 12 publications

References 32 publications

Flotation: A promising microalgae harvesting and dewatering technology for biofuels production

Flotation: A promising microalgae harvesting and dewatering technology for biofuels production

Enhancing Fines Recovery by Hybrid Flotation Column and Mixed Collectors

A Hybrid Device for Enhancing Flotation of Fine Particles by Combining Micro-Bubbles with Conventional Bubbles

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