Flotation of coal particles in MgCl2, NaCl, and NaClO3 solutions in the absence and presence of Dowfroth 250

Kurniawan, Allen; Özdemir, Orhan; Nguyen, Anh V.; Ofori, Philip; Firth, Bruce

doi:10.1016/j.minpro.2010.11.003

Cited by 101 publications

(42 citation statements)

References 14 publications

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“…Many authors have investigated the influence of surfactant type and concentration on the flotation performance (e.g., [7,9,[31][32][33][34][35][36][37][38][39][40][41]). An example involving coal flotation is shown in Figure 16.…”

Section: Influence Of Frother Characterization Parameters On Flotationmentioning

confidence: 99%

Concentration at the Minimum Bubble Velocity (CMV) for Various Types of Flotation Frothers

2017

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This paper presents the determination of a concentration at the minimum bubble velocity (CMV) for different types of frothers, such as straight and branched alkyl chain aliphatic alcohols, 1,ω-diols, poly(propylene glycol) and poly(ethylene glycol) alkyl ethers, n-alkyltrimethylammonium bromides, commercial frothers and others. The values of terminal rise bubble velocity were reviewed from the experimental data published in the literature for two different types of columns, i.e., a short PAS (used in Polish Academy of Sciences) of height (35 cm) and a long McGill of height (350 cm). The obtained empirical equation is universal and allows one to rapidly and accurately determine the CMV for all surfactants. The proposed empirical model can also be used to predict the terminal bubble velocity-frother concentration curve by knowing the maximum and minimum terminal velocities, as well as the values of CMV. Assessment and usefulness of frother characterization parameters (i.e., concentration at the minimum bubble velocity (CMV), dynamic frothability index (DFI) and critical coalescence concentration (CCC)) were shown in the flotation of coal.

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Section: Influence Of Frother Characterization Parameters On Flotationmentioning

confidence: 99%

Concentration at the Minimum Bubble Velocity (CMV) for Various Types of Flotation Frothers

2017

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“…For instance, Quinn et al (2007) found that 23,400 ppm (= 0.4 M) NaCl could give a bubble size and a gas hold up similar to those of 10 ppm of MIBC, suggesting the importance of water quality on flotation performance and thus the need to investigate the interactions between frothers and inorganic electrolytes. There are a number of studies that have reported the interactions between different types of electrolytes and MIBC (Kurniawan et al, 2011;Castro et al, 2013;Bournival et al, 2014a) but none has addressed such interactions with MCHM.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

A comparative study of methyl cyclohexanemethanol and methyl isobutyl carbinol as frother for coal flotation

Park

Wang

2016

International Journal of Mineral Processing

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Methyl isobutyl carbinol (MIBC), an aliphatic alcohol, is widely used as a frothing reagent in coal flotation but it has safety concerns owing to its low flash point (approximately 40 °C). In the present work, we studied a cyclic alcohol, methyl cyclohexanemethanol (MCHM) with a high flash point (approximately 110 °C) and compared its coal flotation performance with that of MIBC. A bottom-driven mechanical flotation cell and two coking coals of distinct floatability, namely A and B, were used. Collectorless flotation tests were carried out with process water for coal A. Flotation tests with diesel as collector at 50 ppm were carried out with simulated process water (0.03 M NaCl solution) and highly saline water (0.5 M NaCl solution), respectively, for coal B. The flotation results showed that MCHM was an effective alternative to MIBC. The highly saline water produced sufficient frothing, obviating the necessity of adding MIBC or MCHM. To understand the effect of frother type and concentration and NaCl concentration on the coal flotation performance, we conducted surface tension measurement for the frother solutions, characterised the dispersion of air near bubble sparger, and measured the stabilities of froth, foam, and foam film. It was found that MCHM was more surface active and more capable of stabilizing froth and foam than MIBC.Foam film stability measured at a broad range of interface approach velocity followed a bellshaped trend and at a given NaCl concentration, the observed peak foam film stability of 15 ppm MCHM was higher than that of 15 ppm MIBC. Increasing NaCl concentration from 0.03 M to 0.5 M had the effect of stabilizing the froth and foam but destabilising the thin foam film.

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“…Bu etki kimya ve biyoloji de Hofmeister etkisi olarak da ifade edilir (Kunz et al 2004). Bu arada literatürde kömür gibi doğal hidrofobik minerallerin elektrolit solüsyonları içerisinde kollektör ve köpürtücü kullanmadan yüzdükleri bilinmektedir (Klassen and Mokrousov 1963;Yoon 1982;Ozdemir et al 2009b;Kurniawan et al 2011 (Mishra 1978;Arnold and Aplan 1986a;Quast et al 2008;Oats et al 2010). Bu tanelerin elek ya da hidroskilon ile kömürden uzaklaştırılmasıyla da flotasyon veriminin arttığı gözlenmiştir (Quast et al 2008;Oats et al 2010 Kömür yüzeyinin özellikleri hidrokarbon iskelete, sayısına, polar grupların tipine ve inorganik safsızlıklara bağlı olarak farklılık göstermektedir.…”

Section: Introductionunclassified

Flotation Behavior of Bituminous and Lignite Coals in Salty Water

Özdemir¹,

Çinku²,

Uslu³

et al. 2013

AKU-J. Sci. Eng.

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ÖzetYüksek konsantrasyondaki inorganik iyonların solüsyon ve ara yüzeyleri etkilediği, kabarcıklar ile taneler arasındaki kolloidal etkileşimleri değiştirdiği dolayısıyla da minerallerin flotasyonunu etkilediği öteden beri bilinmektedir. Bu çalışmada NaCl, KCl, CaCl 2 , MgCl 2 tuzları içerisinde Türk linyit ve taşkömürlerinin hiçbir flotasyon kimyasalı (kollektör ve köpürtücü) kullanılmadan yüzebilirliği araştırılmıştır. Bunun yanı sıra zeta potansiyel ve köpük stabilite testleri de yapılmıştır. Flotasyon deneyleri, taşkömürünün hiçbir kimyasal kullanılmadan sadece tuzlu su ortamında yüzmesinin mümkün olduğunu gösterirken linyit kömürünün yüzmesinin mümkün olmadığını ortaya koymuştur. Kullanılan tuzlar arasında en iyi yüzdürme özelliği olan tuzun MgCl 2 , en düşük yüzdürme özelliği olanın da KCl olduğu ortaya çıkmıştır. 1 M tuz konsantrasyonunda yapılan köpük stabilite deney sonuçları da flotasyonla benzer eğilim sergilemiştir. Bu sonuçlar Na Flotation Behavior of Bituminous and Lignite Coals in Salty Water Key words Flotation;Coal; Salt; Zeta potential; Froth Stability; Ion-specific effect AbstractHigh salt concentrations have a significant effect on bulk and interfacial water structure, and colloidal interactions between bubbles and particles hence affect flotation of minerals. In this study, the floatability of Turkish coals in the presence of NaCl, KCl, CaCl 2 , MgCl 2 salts without the use of any flotation chemicals (collector and frother) was investigated in detail. In addition, zeta potential and foam stability tests were performed. The flotation experiments showed that it is possible to float the natural hydrophobic coal in salt solutions in the absence of collector and frother. On the other hand, the flotation of lignite coals is generally difficult. Additionally, MgCl 2 and KCl solutions showed the highest and the lowest flotation performance improvements, respectively. The froth stability tests at 1 M salt concentration indicated that there is a correlation between the flotation recovery and froth stability. These results also clearly indicated that Na

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Flotation of coal particles in MgCl2, NaCl, and NaClO3 solutions in the absence and presence of Dowfroth 250

Cited by 101 publications

References 14 publications

Concentration at the Minimum Bubble Velocity (CMV) for Various Types of Flotation Frothers

Concentration at the Minimum Bubble Velocity (CMV) for Various Types of Flotation Frothers

A comparative study of methyl cyclohexanemethanol and methyl isobutyl carbinol as frother for coal flotation

Flotation Behavior of Bituminous and Lignite Coals in Salty Water

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