Minimization of fines generation in size reduction of coals by impact crusher

Eswaraiah, C.; Gupta, Anshul; Nagarajan, R.; Rajavel, M.; Nandakumar, K.

doi:10.1016/j.fuproc.2008.01.001

Cited by 14 publications

(5 citation statements)

References 11 publications

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“…Previous discussions on the effects of a on breakage distribution, and the values given in Table 3 suggests that the preferential generation of relatively smaller progenies can be either due to the breakage of smaller or harder particle. The same is in good agreement with the reported literature [5,7,56].…”

Section: Modelingsupporting

confidence: 94%

A novel and direct approach for modeling and simulation of impact grinding

Soni

Eswaraiah

Mishra

2015

Advanced Powder Technology

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Section: Modelingsupporting

confidence: 94%

A novel and direct approach for modeling and simulation of impact grinding

Soni

Eswaraiah

Mishra

2015

Advanced Powder Technology

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“…A similar situation obtains with fluid beds, though the desired size range is smaller (2–6 mm), and similar work has taken place to define how one can minimize fines generation during the process of size reduction with an impact crusher . The study determined that the rotational speed of the crusher is a relevant though weak parameter over which the operator does have some control, but recognizes that the quality of the feed coal to a crushing system is the most important factor.…”

Section: Gasification Research and Developmentmentioning

confidence: 94%

Advances in Coal Gasification, Hydrogenation, and Gas Treating for the Production of Chemicals and Fuels

Higman¹,

2013

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“…1,2 The presence of coal fines in processes that rely on a closely sized feed can reduce the process efficiency. 3,4 The presence of fines in a beneficiated product can also have financial implications for the suppliers as many contracts specify penalties for product that does not meet specifications. 1,2,[5][6][7] Fine coal is also hard to clean, relying on wet processes like flotation, spirals and dense medium cyclones to wash the coal.…”

Section: Introductionmentioning

confidence: 99%

“…20,22,23 Over the years, various studies have tried to shed some light on the effect that physical properties have on the breakage characteristics of coal. 1,3,4,7,8,[22][23][24][25] The effect of comminution machine properties on the breakage characteristics of coal has also been studied. 2,6,7,13,22,24,25 For the impact breakage of coal it has been found that the drop height (impact energy) increases coal degradation.…”

Section: Introductionmentioning

confidence: 99%

“…1,7,22,23,25,26 This is due to bigger particles having more inherent weaknesses, and is referred to as the particle size effect. 4,23,[25][26][27] For samples containing multiple particles and subjected to multiple drops, the removal of fines after each drop increased the total fines generation when compared to the same amount of drops without removal of the fines. This is referred to as cushioning.…”

Section: Introductionmentioning

confidence: 99%

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The qualification of coal degradation with the aid of micro-focus computed tomography

Viljoen¹,

Campbell²,

Roux³

et al. 2015

S. Afr. J. Sci.

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The production of unwanted coal fines during the handling and utilisation of coal is a serious problem in processes that rely on large or closely sized particles. Coal degradation occurs at many different steps within the beneficiation or utilisation processes and through many different mechanisms, none of which are understood thoroughly. In an effort to describe the degradation mechanisms, the changes within a number of coal particles were tracked using micro-focus X-ray computed tomography (µ-CT). The observed changes were caused by impact loading, compressive loading and thermal shock. The resolution of the µ-CT tomograms enabled the identification and tracking of changes in the coal microstructure. A comparison of the tomograms taken before, during and after breakage and fracture showed that the microstructure of coal had an influence on the breakage characteristics. For impact-and compressive loading as well as during thermal treatment, the biggest structural contributor was shown to be the network of pre-existing cracks and cleats within a particle. Lower density macerals contributed more to breakage than the higher density macerals and any structure (pre-existing cracks, lithotypes boundaries and mineral boundaries) present within the particles had the potential to either act as a crack initiation site, change the direction of a propagating crack or arrest crack propagation. The direction of the applied loads during compressive-and impact loading was the biggest contributor to the directionality of newly formed cracks. For thermal treatment, the vitrinite rich microlithotypes showed more new crack formation compared to the other microlithotypes present. The particles also showed no evidence of devolatilisation (an increase in the porosity of the particle) but did show evidence of thermal drying (new cracks formed perpendicular to existing cracks).

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Minimization of fines generation in size reduction of coals by impact crusher

Cited by 14 publications

References 11 publications

A novel and direct approach for modeling and simulation of impact grinding

A novel and direct approach for modeling and simulation of impact grinding

Advances in Coal Gasification, Hydrogenation, and Gas Treating for the Production of Chemicals and Fuels

The qualification of coal degradation with the aid of micro-focus computed tomography

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