Comparative study of the performance of conventional and column flotation when treating coking coal fines

Jena, M. S.; Biswal, S.K.; Das, Sarada Prasad; Reddy, P. R.

doi:10.1016/j.fuproc.2008.06.012

Cited by 61 publications

(13 citation statements)

References 13 publications

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“…Due to complex flow behavior in nature, the performance of column flotation is influenced by the flow characteristics of the process [4]. Previously, the research was carried out to evaluate the effect of the hydrodynamic parameters on the performance of the column flotation [5].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic study of two phase flow of column flotation using electrical resistance tomography and pressure probe techniques

Vadlakonda

Mangadoddy

2017

Separation and Purification Technology

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic study of two phase flow of column flotation using electrical resistance tomography and pressure probe techniques

Vadlakonda

Mangadoddy

2017

Separation and Purification Technology

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“…Increased surface hydrophobicity promotes recovery of coarse particles by reducing the probability of detachment [11]. Column flotation is a sophisticated froth flotation, which has been developed as an alternative to the conventional, mechanically agitation flotation and it has been claimed that column flotation gives higher recovery with lower ash content [12][13]. The main advantages of the column flotation cells over mechanical ones include excellent separation ability, low capital and operating cost, a less demand for plant space, simple circuit and efficient selfcleaning and adaptability to automatic control [8,14].…”

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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“…A majority of coking coal in China has an intergrowth of coal with gangue, which is difficult to clean to a low ash content [2]. Froth flotation is an effective separation method for fine coal cleaning utilizing the differences in the surface hydrophobicity between the organic and mineral matters [4][5][6] and has been widely used to treat Downloaded by [University of Nebraska, Lincoln] at 07: 13 10 June 2016 A c c e p t e d M a n u s c r i p t 3 fine coking coal [7][8][9][10]. However, floating of middlings and coarse particles and entrainment of fine minerals in the froth remains a problem [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…It has been reported that removing fine particles from coal samples by sieving or desliming with a hydrocyclone can improve coal flotation performance [20,21]. Additionally, column flotation obtains a lower ash content clean coal compared to conventional flotation [8,22,23].…”

Section: Introductionmentioning

confidence: 99%

Effective Beneficiation of a Fine Coking Coal Using a Novel Flotation Scheme

Gao

Cao³

et al. 2016

International Journal of Coal Preparation and Utilization

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Effective flotation of fine coal remains challenging due to flotation inefficiency of coarse,intergrowth particles and contamination due to fine particles. In this paper, a novel flotation scheme, named split-conditioning and bulk-flotation (SCBF) has been proposed to improve flotation efficiency of coarse and fine particles. The conditioning time and impellor speed of flotation machine for coarse and fine particles were optimized using the nine well-planed orthogonal experiments. The results demonstrated that using the SCBF approach, an increase of 12.43% recovery for +0.074 mm particles and a decrease of 2.42% ash content in the -0.074 mm Downloaded by [University of Nebraska, Lincoln] atA c c e p t e d M a n u s c r i p t 2 fractions were obtained compared to the conventional flotation. Based on the orthogonal experiments analysis, the optimal mixing conditions for +0.074 mm particles were the impellor speed of 2100 rpm and conditioning time of 240 s, whereas for the -0.074mm size particles impellor speed of 2100 rpm and conditioning time of 60 s were found to be the most important factor in the SCBF. It was found that for +0.074 mm particles higher impellor speed and longer conditioning time improved the recovery of coarse particles, and shorter conditioning time for -0.074 mm particles reduced the contamination in clean coal.

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Comparative study of the performance of conventional and column flotation when treating coking coal fines

Cited by 61 publications

References 13 publications

Hydrodynamic study of two phase flow of column flotation using electrical resistance tomography and pressure probe techniques

Hydrodynamic study of two phase flow of column flotation using electrical resistance tomography and pressure probe techniques

Fine coal beneficiation by pilot column flotation

Effective Beneficiation of a Fine Coking Coal Using a Novel Flotation Scheme

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