Improved comminution efficiency through controlled blasting during mining

Chi, G.; Fuerstenau, M. C.; Bradt, R. C.; Ghosh, Amitava

doi:10.1016/0301-7516(95)00098-4

Cited by 16 publications

(9 citation statements)

References 10 publications

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“…Impact velocities in most comminution equipment is about 10 m s À1 while in blasting, the impact produces shock waves in all directions that move through the rock with velocities of 2 km s À1 or greater [15][16]. In order to study comminution in this higher velocity regime [17][18][19][20], an apparatus to measure the quantitative parameters of impact velocity on aggregated rock samples has been developed.…”

Section: Higher-velocity Impact Comminutionmentioning

confidence: 99%

Influence of impact velocity on fragmentation and the energy efficiency of comminution

Sadrai

Meech

Ghomshei

et al. 2006

International Journal of Impact Engineering

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Section: Higher-velocity Impact Comminutionmentioning

confidence: 99%

Influence of impact velocity on fragmentation and the energy efficiency of comminution

Sadrai

Meech

Ghomshei

et al. 2006

International Journal of Impact Engineering

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“…Unfortunately, the energy efficiency is extremely low in mining operations. For instance, the energy efficiency is about 10% in percussive rock drilling (Carrol 1985), 3-5% in rock crushing (Prasher 1987), 1% in ball and rod milling (or grinding) (Chi et al 1996;Alvarado et al 1998;Fuerstenau and Abouzeid 2002), and about 6% in rock blasting (Ouchterlony et al 2003;Sanchidrián et al 2007). These low energy efficiencies result in a huge amount of energy wastage and make mining operations much worse than other industrial sectors in terms of energy utilization.…”

Section: Introductionmentioning

confidence: 99%

Energy Requirement for Rock Breakage in Laboratory Experiments and Engineering Operations: A Review

Zhang

Ouchterlony

2021

Rock Mech Rock Eng

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Based on the review of a wide range of literature, this paper finds that: (1) the average specific surface energy of various single crystals is only 0.8 J/m2. (2) The average specific fracture energy of the rocks with a pre-crack under static cleavage tests is 4.6 J/m2. (3) The average specific fracture energy of the rocks with a pre-cut notch but with no pre-crack under static tensile fracture (mode I) tests is 4.6 J/m2. (4) The average specific fracture energies of regular rock specimens with neither pre-made crack nor pre-cut notch are 26.6, 13.9 and 25.7 J/m2 under uniaxial compression, tension and shear tests, respectively. (5) The average specific fracture energy of irregular single quartz particles under uniaxial compression is 13.8 J/m2. (6) The average specific fracture energy of particle beds under drop weight tests is 74.0 J/m2. (7) The average specific fracture energy of multi-particles in milling tests is 72.5 J/m2. (8) The average specific energy of rocks in percussive drilling is 399 J/m3, that in full-scale cutting is 131 J/m3, and that in rotary drilling is 157 J/m3. (9) The average energy efficiency of milling is only 1.10%. (10) The accurate measurements of specific fracture energy in blasting are too few to draw reliable conclusions. In the last part of the paper, the effects of inter-granular displacement, loading rate, confining pressure, surface area measurement, premade crack, attrition and thermal energy on the specific fracture energy of rock are discussed.

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“…For example, during the cutting and drilling, only about 10% of the input energy is used for the effective crushing, while most of the input energy is dissipated in heat or other forms [8]; during the blasting, the energy utilization rate for rock crushing is only about 5%-15% [9]. Chi et al concluded that less than 1% of the input energy is used to crush rock and form a new fracture surface [10]. Therefore, further quantitative study on the energy dissipation law and fragment distribution characteristics of coal samples under dynamic tensile failure are of great significance for the dynamic disaster prevention, resource recovery rate, and energy efficiency in coal mines.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bedding Structure on the Energy Dissipation Characteristics of Dynamic Tensile Fracture for Water-Saturated Coal

et al. 2021

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The analysis of energy dissipation characteristics is a basic way to elucidate the mechanism of coal rock fragmentation. In order to study the energy dissipation patterns during dynamic tensile deformation damage of coal samples, the Brazilian disc (BD) splitting test under impact conditions was conducted on burst-prone coal samples using a split Hopkinson pressure bar (SHPB) loading system. The effects of impact velocity, bedding angle, and water saturated on the total absorbed energy density, total dissipated energy density, and damage variables of coal samples were investigated. In addition, the coal samples were collected after crushing to produce debris with particle sizes of 0-0.2 mm and 0.2-5 mm, and the distribution characteristics of different size debris were compared and analyzed. The results show that the damage variables of natural dry coal samples increase approximately linearly with the increase of impact velocity; however, the overall damage variables of saturated coal samples increase exponentially as a function of impact velocity. Compared with air-dry samples, the number of fragments with the particle size of 0-0.2 mm of saturated samples decreases by 14.1%-31.3%, and the number of fragments with the particle size of 0.2-5 mm decreases by 33.7%-53.0%. However, when the bedding angle is 45°, the percentage of fragment mass of saturated samples is larger than that of air-dry samples. The conclusions provide a theoretical basis for understanding the deterioration mechanism of coal after water saturation and the implementation of water injection dust prevention technology in coal mines.

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Improved comminution efficiency through controlled blasting during mining

Cited by 16 publications

References 10 publications

Influence of impact velocity on fragmentation and the energy efficiency of comminution

Influence of impact velocity on fragmentation and the energy efficiency of comminution

Energy Requirement for Rock Breakage in Laboratory Experiments and Engineering Operations: A Review

Effect of Bedding Structure on the Energy Dissipation Characteristics of Dynamic Tensile Fracture for Water-Saturated Coal

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