Study on Size and Density Distribution in Fine Coal Flotation

Gan, Cheng; Gui, Xiaohong; Liu, J. T.; Xu, Huirong; Wang, Y. T.; Zhang, Q. D.; Song, Chang

doi:10.1080/19392699.2013.763232

Cited by 18 publications

(5 citation statements)

References 2 publications

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“…Particles between -250 to +75 µm size accounts for 41.28% of the total mass of particles, which is suitable for flotation. As expected the fine particles contains high ash [3].…”

Section: Methodssupporting

confidence: 83%

The Effect of Grinding Time on Difficult-to-Float Coal

Gan

Huang

et al. 2013

AMR

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Coal is a valuable natural resource for economic development. Clean coal and gangue can be liberated through grinding to improve the recovery of the clean coal. In this study, the mineral composition, size distribution of the raw coal and the grinding time test were investigated. The results showed that the main gangue minerals in the raw coal were kaolinite, quartz, illite, and smectite. The cumulative yield of ash increased sequentially with increasing grinding time. A longer grinding time corresponded to a higher degree of dissociation.

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“…Particles between -250 to +75 µm size accounts for 41.28% of the total mass of particles, which is suitable for flotation. As expected the fine particles contains high ash [3].…”

Section: Methodssupporting

confidence: 83%

The Effect of Grinding Time on Difficult-to-Float Coal

Gan

Huang

et al. 2013

AMR

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“…As seen, the main gangue minerals of the samples were quartz and fraipontite. Quartz, however, dominated the mineral composition with characteristics such as soft texture, easy sliming, high adsorption ability, and the ability to easily pollute the clean coal [28,29]. The size distribution of the tailings is shown in Table 2.…”

Section: Analyses Of Tailingsmentioning

confidence: 99%

Optimization of Coal Washery Tailings by Flotation Process

2019

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Flotation tailings are by-products of coal preparation plants, which do not only occupy cultivated land but also cause pollution. The high ash content and low calorific value of tailings limit their applications. Deashing is the precondition for the reutilization of flotation tailings. However, it is more difficult to remove ash content from flotation tailings compared with raw coal. Based on the analysis of coal properties, the flotation performance of different collectors was compared in this study. Flotation flows and the mechanism of depressants were explored. The optimized flotation conditions were as follows: pulp concentration of 100 g/L, inflation rate of 0.25 m3/(m2·min), collector (C4) dosage of 300 g/t, frother dosage of 500 g/t, and revolving speed of 2200 rpm. The ash content of clean coal was also reduced by adding a depressant. The flotation performance was best when the amount of sodium hexametaphosphate (used as the depressant) was 4 kg/t; the recovery of clean coal was 71.88%, and the ash content was 10.64%.

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“…Coal flotation makes use of the natural hydrophobicity of the carbonaceous matter in coal [8]. Although coal is naturally hydrophobic, collectors have been used to enhance the hydrophobicity of coal in coal flotation [9]. The upper particle size limit for flotation using novel flotation reagents increases the yield [10].…”

Section: Introductionmentioning

confidence: 99%

Fine coal beneficiation by pilot column flotation

Vasumathi¹,

Vijayakumar²,

Prasad³

et al. 2018

J Min & Metal A Mining

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Beneficiation of coal fines with high ash content was attempted in an operating coal preparation plant by retrofitting a 0.5 m diameter pilot plant scale flotation column in the circuit. The collector and frother dosage were optimized as 0.680 kg/t and 0.058 kg/t respectively. At these reagent conditions the operating parameters of pilot scale flotation column were also optimized. The maximum yield of the froth obtained was 67.5% at the targeted ash level of 14% from a feed of 25% ash content. This was obtained at the operating parameters of 0.85 cm/s superficial air flow velocity, 0.57 cm/s superficial feed slurry velocity and 600 mm froth height. The performance of flotation column was found to be marginally better than that of the conventional flotation cells in the washery. Also, advantages such as low operational, maintenance and energy costs and operational flexibility in the case of flotation column could lead to financial accruals over a long run.

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Study on Size and Density Distribution in Fine Coal Flotation

Cited by 18 publications

References 2 publications

The Effect of Grinding Time on Difficult-to-Float Coal

The Effect of Grinding Time on Difficult-to-Float Coal

Optimization of Coal Washery Tailings by Flotation Process

Fine coal beneficiation by pilot column flotation

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