Effect of pH, air velocity and frother concentration on combustible recovery, ash and sulphur rejection using column flotation

Piñeres, Jorge; Barraza, Juan

doi:10.1016/j.fuproc.2012.01.004

Cited by 24 publications

(15 citation statements)

References 18 publications

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“…Only once these characteristics are well understood, effective strategies to reduce environmental risks could be addressed. Moreover, the USA, Japan, Colombia, South Africa, China, and Brazil, among other countries, routinely apply washing treatments for coal beneficiation (Okuyama et al 2009;Piñeres et al 2009;Taute et al 2009;Silva and Oliveria 2010), which suggests that CCR are not a local issue but an ever-growing worldwide concern. Thus, the main aims of this study are (1) to determine the geochemical and mineralogical characteristics of coal cleaning residues, (2) to assess the leaching potential of these wastes for an extensive list of elements, and (2) to provide new data for technical basis of further reclamation plans for the area affected by coal mining.…”

Section: Introductionmentioning

confidence: 99%

Leaching of potential hazardous elements of coal cleaning rejects

Silva

Izquierdo

Querol

et al. 2010

Environ Monit Assess

107

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The geochemical characteristics of coal cleaning rejects (CCR) in Santa Catarina State, Brazil, were investigated. Around 3.5 million ton/year of coal waste are dumped in Santa Catarina State. Coal beneficiation by froth flotation results in large amounts of CCR composed of coaly and mineral matter, the latter characterised by the occurrence of sulphide minerals and a broad array of leachable elements. The total and leachable contents of more than 60 elements were analysed. Atmospheric exposure promotes sulphide oxidation that releases substantial sulphate loads as well as Ca2+, K+, Mg2+, Cl- and Al3+. The metals with the most severe discharges were Zn, Cu, Mn, Co, Ni and Cd. Most trace pollutants in the CCR displayed a marked pH-dependent solubility, being immobile in near-neutral samples. The results highlight the complex interactions among mineral matter solubility, pH and the leaching of potentially hazardous elements.

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Section: Introductionmentioning

confidence: 99%

Leaching of potential hazardous elements of coal cleaning rejects

Silva

Izquierdo

Querol

et al. 2010

Environ Monit Assess

107

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“…This indicates that the coal sample used had a high degree of mineral matter release. Likewise, the flotation column had a bubble size distribution that promoted a good bubble-coal particle adhesion, thus proving the effectiveness and selectivity of test-rig loop flotation columns (Piñeres and Barraza, 2012). The results show that the mass yield tends to increase with the frother concentration increase for the two coal samples (Table 5).…”

Section: Resultsmentioning

confidence: 68%

“…The high mass yield obtained at high frother concentrations is due to the decrease in bubble diameter obtained under these conditions (increase in the frother concentration) as a consequence of water surface tension decrease (Fuerstenau and Pradip, 1982;Finch et al, 2008;Piñeres and Barraza, 2012). This effect may be attributed to mass transfer at the water-frother interface, which produces a surface tension gradient, thus generating spherical, small-sized air bubbles with a rigid surface (increase in available surface area of air bubbles) and, likewise, increasing air bubble hydrophobicity, favoring particle-bubble adhesion and increasing the mass yield.…”

Section: Resultsmentioning

confidence: 99%

“…During the flotation process, hydrophobic particles adhere to air bubbles, while hydrophilic particles remaining in the slurry. The successfulness of the mineral matter reduction present in coal is related to the difference in the grade of intrinsic hydrophobicity between the organic matter and the mineral matter present in the coal (Honaker et al, 1996;Polat and Chander, 2003;Piñeres and Barraza, 2012). Some authors determined the effects of frother mixture on froth flotation performance.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Diesel Oil and Mixture of Alcohol-Glycol Ether on Colombian Ultrafine Coal Cleaning Using a Test-Rig Closed-Loop Flotation Column

2021

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A test-rig closed-loop flotation column was used to observe the effect of diesel oil (collector) and Flomin F-425 (frother) on mass yield and ash content for two Colombian coals: Caypa (northern zone) and Guachinte (southwestern zone). The coal samples of less than 38 µm (-400 M) were processed in a collector concentration range of 0,32 to 1,60 kg/ton of coal, as well as a frother concentration range of 10 to 50 ppm. The response surface methodology was used for the experimental test runs. The results showed that the maximum mass yield obtained by Caypa coal was 98,39% at 1,28 kg of collector/ton of coal and 40 ppm of frother concentration, whereas Guachinte coal obtained a maximum mass yield of 94,71% at 0,96 kg of collector/ton of coal and 30 ppm of frother concentration. In general, for Caypa coal, the mass yield tends to increase (low ash removal) with the collector and frother concentration increase; while the mass yield tends to decrease (high ash removal) for Guachinte coal when the collector concentration increases (low ash removal) at high frother concentrations. It is worth highlighting that the ash content of 0,65% obtained for Caypa coal is the lowest value reported in the literature while employing a test-rig loop flotation column in a single stage, which is considered to be an ultra-clean coal obtained by a physical cleaning process.

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“…Many parameters affect the quality of the flotation process, such as particle size, air flow rate, gas hold-up, power input of flotation cells, and so on [1][2][3][4][5]. In coal flotation, an index of low concentrate ash content and a high yield with a low energy input are the objectives of the flotation process.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Power Input on the Fine Coal Flotation Rate Constant

Gui

Cao

Liu

et al. 2015

International Journal of Coal Preparation and Utilization

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To explore the effect of the power input on the fine coal flotation rate constant, an energy consumption test system was established for the fine coal. In this investigation, the fine coal investigated was anthracite obtained from the flotation feed of the Xuehu Coal Preparation Plant of the Shenhuo mine in the Henan Province of China. A total of 65 sets of flotation rate tests were carried out with different power inputs at different flotation times. The relationship between the flotation rate constant and the power input at different flotation times was obtained. The result showed that the flotation rate displayed a constant increase, whereas the power input increased at any time during the flotation process. With the continuous increase of the power input, the increasing trend exhibited by the flotation rate constant decreases after reaching a maximum value. The calculation conjecture of the flotation rate constants and the power input were obtained by imitating the calculation method of the flotation kinetics model. Determining the value of the flotation power input and the flotation time during the flotation process of the different fine coal characteristics would therefore be helpful.

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Effect of pH, air velocity and frother concentration on combustible recovery, ash and sulphur rejection using column flotation

Cited by 24 publications

References 18 publications

Leaching of potential hazardous elements of coal cleaning rejects

Leaching of potential hazardous elements of coal cleaning rejects

Effect of Diesel Oil and Mixture of Alcohol-Glycol Ether on Colombian Ultrafine Coal Cleaning Using a Test-Rig Closed-Loop Flotation Column

The Effect of Power Input on the Fine Coal Flotation Rate Constant

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