Nanobubble-Assisted Flotation of Apatite Tailings: Insights on Beneficiation Options

Chipakwe, Vitalis; Jolsterå, Rickard; Chelgani, S. Chehreh

doi:10.1021/acsomega.1c01551

Cited by 22 publications

(13 citation statements)

References 31 publications

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“…The highest S.E can be observed when starch and PGA were 50 and 300 g/t, respectively. The observed improvements in flotation separation corroborate findings reported elsewhere on the beneficial effects of a narrow particle size distribution 27 , 28 and surface roughness 39 , 40 . Besides the superior properties observed from using PGA, surface analyses were considered to assess PGA interaction with mineral surfaces.…”

Section: Resultssupporting

confidence: 89%

“…Understanding and controlling any GA-separation reagent interactions is critical to ensure that the required downstream process efficiency and integrity of the whole value chain are maintained. Such an understanding would be essential, particularly for flotation separation, where the separation could be efficient in the specific particle size range (mainly −100 + 25 µm) 27 , 28 .…”

Section: Introductionmentioning

confidence: 99%

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Beneficial effects of a polysaccharide-based grinding aid on magnetite flotation: a green approach

Chipakwe

Karlkvist

Rosenkranz

et al. 2022

Sci Rep

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Grinding is the most energy-intensive step in mineral beneficiation processes. The use of grinding aids (GAs) could be an innovative solution to reduce the high energy consumption associated with size reduction. Surprisingly, little is known about the effects of GAs on downstream mineral beneficiation processes, such as flotation separation. The use of ecofriendly GAs such as polysaccharide-based materials would help multiply the reduction of environmental issues in mineral processing plants. As a practical approach, this work explored the effects of a novel polysaccharide-based grinding aid (PGA) on magnetite's grinding and its reverse flotation. Batch grinding tests indicated that PGA improved grinding performance by reducing energy consumption, narrowing particle size distribution of products, and increasing their surface area compared to grinding without PGA. Flotation tests on pure samples illustrated that PGA has beneficial effects on magnetite depression (with negligible effect on quartz floatability) through reverse flotation separation. Flotation of the artificial mixture ground sample in the presence of PGA confirmed the benefits, giving a maximum Fe recovery and grade of 84.4 and 62.5%, respectively. In the absence of starch (depressant), PGA resulted in a separation efficiency of 56.1% compared to 43.7% without PGA. The PGA adsorption mechanism was mainly via physical interaction based on UV–vis spectra, zeta potential tests, Fourier transform infrared spectroscopy (FT-IR), and stability analyses. In general, the feasibility of using PGA, a natural green polymer, was beneficial for both grinding and reverse flotation separation performance.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Beneficial effects of a polysaccharide-based grinding aid on magnetite flotation: a green approach

Chipakwe

Karlkvist

Rosenkranz

et al. 2022

Sci Rep

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“…[1,2] The addition of reagents during NB generation has been reported to improve flotation performance . [3,[18][19][20] Nazari et al, [19] during coarse flotation of pure quartz found MIBC to be more effective compared to pine oil and dodecyl amine (DDA) when added during the nanobubble generation. This is due to the decrease in surface tension of the liquid, which translates into production of finer bubbles .…”

Section: Discussionmentioning

confidence: 99%

“…A higher selectivity index S extrapolates better selectivity for the process . [17,18] The flotation rate constant k, for each scenario, was calculated using the firstorder equation 2. [5] Pure quartz (Single) -−100 + 48 µm 23% mass recovery [6] Pure quartz (Single) MIBC −425 + 106 µm +5-20% mass recovery [7] Pure quartz (Single) A65 −425 + 106 µm + 15-20% mass recovery [7] Apatitic ore -−75 µm +8.9% recovery, −1.9% grade [6] Phosphate ore Flo-Y-S −38 µm +35.4% recovery, +3.4% grade [8] Hematite ore TD-II −150 µm +16.0% recovery, -grade [9]…”

Section: Flotationmentioning

confidence: 99%

Nanobubble assisted flotation separation of complex Pb–Cu–Zn sulfide ore – Assessment of process readiness

Chipakwe

Sand

Chelgani

2021

Separation Science and Technology

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A considerable difference exists between the flotation separation of artificial minerals and real lowgrade ores processing where selectivity would be the main issue. Nanobubble-assisted (NB) flotation investigations have been mostly examined with pure materials and a narrow particle size range, less on complex sulfide ores. This study considered NB flotation for processing complex Pb-Cu-Zn sulfide ore in two different size ranges and various conditions to assess the process readiness. Metallurgical NB flotation responses (recovery, grade, kinetics, and selectivity index) were determined, compared to conventional tests. Outcomes revealed that an inclusive size fraction (−150 µm) could result in a higher selective process than a fine fraction (-38 µm). In contrast, mass recovery and kinetics were higher for the fine one. In general, adding NBs compared to the conventional (CB) could improve the flotation metallurgical responses; however, the way NBs were generated would be key. NBs generated in the presence of frother (NBF) could produce higher mass and water recoveries while decreasing selectivity. In general, different setups' flotation products showed the following selectivity order of Pb-Cu sulfides: NB>NBF>CB. These results opened a new approach for considering different NB generation conditions when they are going to use in various flotation stages.

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“…The other part relates to the cell drawbacks including the inability to produce small bubbles, short retention time for such fine particles, and poor and inefficient turbulence. To overcome these obstacles, researchers either enlarged particle size using flocculation-flotation processes (Yin et al, 2011;Li et al, 2021), applied micro/nano-bubble assisted flotation (Fan et al, 2012;Chipakwe et al, 2021), or utilized intensified cell turbulence (Schubert, 2008;Safari et al, 2014;Testa et al, 2017;Hoseinian et al, 2019). Researchers changed the cell hydrodynamics and invented reactor-separator flotation cells creating remarkable gas hold-up, small bubble sizes, and intensive turbulences (Imhof 2006;Jameson, 2010;Cole et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Introducing key advantages of intensified flotation cells over conventionally used mechanical and column cells

Hassanzadeh¹,

Safari²,

Khoshdast³

et al. 2022

Physicochem. Probl. Miner. Process.

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The present paper introduces the key advantages of Imhoflot TM , Jameson TM , and Reflux TM flotation cells over the conventionally used mechanical and column cells from different perspectives. The impact of slurry mean retention time, bubble size distribution, and energy input was studied for all cell types. The mean retention time in laboratory-scale Imhoflot TM (V030-cell) and Reflux TM flotation cells (RFC100) were measured experimentally using KCl as a tracer. Also, initially a statistical and practical overview of previously installed Imhoflot TM , and Jameson TM cells was presented in this work. It was found that more industrial data is available for the Jameson TM cell. The diagnostic results showed that Reflux TM , Jameson TM , and Imhoflot TM functionally operate similarly based on providing intensive turbulence in the downcomer. They were initially applied to the Australian and the UK coal industries and installed in the cleaning stage of flotation circuits, while there are now more applications in a wide variety of minerals across the world in different flotation stages. First pilot trials on a Russian gold ore were reported operating both Jameson TM and Imhoflot TM cells at the rougher-scalper and cleaner stages providing superior results using the Imhoflot TM cell as rougher-scalper and the Jameson TM at the cleaner. Formation of sub-micron and micron-sized bubbles, effective hydrodynamic characteristics, and low capital and operating costs were reported as major advantages of intensified flotation cells over the conventionally used ones in improving the recoverability of ultra-fine particles. Literature data showed that these cells provide greater gas-hold-up values (40-60%) over the mechanical (5-20%) and column cells (5-25%) with substantially lower power inputs. It was indicated that low mean slurry retention time could lead to a potential enhancement in their throughputs, but further industrial measurements are required to prove this statement. The Reflux TM cell showed a plug-flow mixing regime, while Imhoflot TM V-Cell followed perfect mixing dispersion regime.

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Nanobubble-Assisted Flotation of Apatite Tailings: Insights on Beneficiation Options

Cited by 22 publications

References 31 publications

Beneficial effects of a polysaccharide-based grinding aid on magnetite flotation: a green approach

Beneficial effects of a polysaccharide-based grinding aid on magnetite flotation: a green approach

Nanobubble assisted flotation separation of complex Pb–Cu–Zn sulfide ore – Assessment of process readiness

Introducing key advantages of intensified flotation cells over conventionally used mechanical and column cells

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