Considering optimal fragmentation and less damage below the bench floor level, both theoretical and field studies indicated that the detonator position plays an important role in rock ...
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The optimization of blasting operations greatly benefits from the prediction of rock fragmentation. The main factors that affect fragmentation are rock mass characteristics, blast geometry, and explosive properties. This paper is a step towards the implementation of machine learning and deep learning algorithms for predicting the extent of fragmentation (in …
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An economic-oriented policy of rock fragmentation can reduce the additional costs due to undesirable rock fragmentation on blast downstream operations. Furthermore, an environment-oriented plan of undesirable blasting consequences is capable of decreasing the adverse impacts of fly-rock, toe problems, and back-break on the environment and mine ...
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In this paper, we propose a methodology for the prediction of the performance of hydraulic rock breakers in the excavation of a rock mass. The case study area is located in …
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Regarding such a situation, this article describes the effects of rock fragmentation by blasting on the energy consumption, productivity, minerals' recovery, operational costs in the whole size reduction chain from mining to mineral processing, and the sustainability of mining industry. ... a coarser fragmentation, a smaller crusher flow and ...
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Rock fragmentation is one of the most commonly optimized blasting outcomes due to its significant influence on the efficiency of downstream …
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Blasting and fragmentation are complex processes driven by the interaction of explosive energy, rock mechanics, and blast design parameters. Understanding these …
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The Swebrec function is a fragment size distribution function that links rock fragmentation by blasting and crushing. The function is used to help predict fragment size as a result of blasting. ... the JKMRC approach to describing crusher circuits, and the original natural breakage characteristic concept of material-specific size distribution ...
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The calibration of the mine-to-crusher model was based on rock fragmentation from the blasting phase through the primary crushing phase from an analysis of pictures of the fragmented pile. A reduction in cost was determined for an optimum 90% passing size (P90). The calibration was performed with technical and economic parameters from 2 years ...
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The rock fragmentation reflects the degree of control of blasting. Despite the accuracy of screening analysis to determine the size distribution of blasted rocks, this technique remains complex ...
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Crushers are widely used in the mining industry all over the world. Understanding fragmentation behaviour of rock under crushing process is fundamental to improved …
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Rock fragmentation is one of the most commonly optimized blasting outcomes due to its significant influence on the efficiency of downstream operations. This paper reviews the …
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In sharp contrast to prefabricated cracks, the damage to rock masses resulting from external disturbances such as excavation disturbances and tectonic movement varies substantially as to the incidence, density, and magnitude of defects. The growth ratio of the energy dissipation density proportion D(Rω (α)) of the damaged rock under impact loading is …
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Regarding such a situation, this article describes the efects of rock fragmentation by blasting on the energy consumption, productivity, minerals' recovery, operational costs in the whole size...
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Rock fragmentation can in principle be managed by means of two options: by increasing or reducing the specific consumption of explosives, or by modifying the drilling pattern. ... To optimize the efficiency of the crushing process, the primary crusher at the NCQ cement plant fed with fine to medium-sized rocks measuring less than 100 cm, while ...
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Digital image processing method was used for the assessment of the particle size distribution of blasted rock. The fragmentation results then were paired with the crusher throughput values, and ...
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Numerous researchers have applied numerical modeling to simulate the fragmentation of rock by TBMs. The prediction of the fragmentation process during rock cutting using various numerical methods was reviewed in detail by …
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The rock fragmentation in the pit was estimated as smaller sizes while that on the ROM pad was widely spread. Figure 15 shows the characteristics of the estimated size distribution of the rock fragments of the muckpile in pit and rockpile on the ROM pad compared to the expected rock fragment size from the blast (size requirement for the primary ...
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Rock fragmentation is one of the most commonly optimized blasting outcomes due to its significant influence on the efficiency of downstream operations. This paper reviews the influence of blast fragmentation on processing of metal ores. ... For comminution circuit employing primary crusher and semi-autogenous (SAG) mill, Michaux and Djordjevic ...
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In this paper, a theoretical estimation model of TBM thrust, torque, and power in the rock–soil interface (RSI) of mixed ground is developed, including a new force model for the drag cutter that ...
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Prediction of rock fragmentation due to blasting using artificial neural network. A Bahrami, M Monjezi, K Goshtasbi, A Ghazvinian. Engineering with computers 27, 177-181, 2011. 172: 2011: Combination of neural network and ant colony optimization algorithms for prediction and optimization of flyrock and back-break induced by blasting.
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The mechanism of rock fragmentation within crushers is dominated by compression at high strain rates. Research presented in this paper has investigated the relationship between strain rate, impact energy, the degree of fragmentation and energy efficiencies of fragmentation. For the investigation two laboratory test methods were used to generate ...
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During quarry design, most of the crushers selected at this stage are not appropriate for the muck-pile size ranges produced after rock fragmentation. Therefore, fragmentation performance, quality rating, and fragment size distribution prediction for suitable crusher selection were investigated to bridge the gap of mismatched crushers in quarries. Bulk …
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According to Kinyua et al.'s review work [8] on fragmentation's influence on downstream operations, the particle size of the run-of-mine ore and the degree of internal micro fracturing in the fragments induced by blasting have been identified as the two key aspects of rock fragmentation that influence downstream mineral processing operations.
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A new three-parameter fragment size distribution function has been found that links rock fragmentation by blasting and crushing. The new Swebrec© function gives excellent fits to hundreds of sets ...
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Jang, H. et al. Development of 3D rock fragmentation measurement system using photogrammetry. Int. J. Mining Reclam. Environ. 34, 294–305 (2020). Article Google Scholar
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In this study, the calibration of the mine-to-crusher model was based on rock fragmentation from the blasting phase. The costs of each mine operation phase were estimated for an optimum 80% passing size (P80). The calibration was conducted with the values of technical and economic parameters in 2019. By considering the structural lithologies of ...
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The size of rock fragmentation plays an important role in the economic efficiency of surface mining operations. It directly affects the costs associated with drilling, blasting, loading, and crushing. ... The percentage cumulative passing for gyratory crusher with the feed size of 1500 mm ranges between 92.8 to . The stiffness ratio, powder ...
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Following each blast, the much pile dimensions were documented and an optical fragmentation analysis was conducted throughout the excavation of the shot rock. The primary crusher throughput was also monitored. Previous studies have demonstrated a direct correlation between improved fragmentation and increased productivity.
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In hard rock mining, blasting is generally the first operation of rock fragmentation from its in-situ state. Therefore, blast design and geotechnical ore properties have a significant impact on downstream processes such as crushing and grinding. ... After entering crusher product PSD and A, b parameters to the SAG mill model and BWi values into ...
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Improvement of blast-induced fragmentation and crusher efficiency by means of optimized drilling and blasting in Aitik. ACKNOWLEDGMENTS The thesis project presented in this report was conducted in Boliden's Aitik mine; thereby I wish to gratefully thank Boliden Mines for their financial and technical support. I would like to express my very great appreciation to Ulf …
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After changes in the blasting practices the downtime was reduced, which improved the crushing plant utilization by 4.9%. The improved blasting practices and more consistent fragmentation decreased the average number of loads lost each month due to jaw crusher blockages from 9.2% to 3.9% of plant throughput.
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In hard rock mining, blasting is generally the first operation of rock fragmentation from its in-situ state. Therefore, blast design and geotechnical ore properties have a significant …
WhatsApp: +86 18221755073
The mechanism of rock fragmentation within crushers is dominated by compression at high strain rates. Research presented in this paper has investigated the relationship between strain rate, impact ...
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Rock fragmentation is the technique in which a part of rock mass is separated from the parent rock and broken into rock fragments during digging. In the eleventh century B.C. in China (the Shang Dynasty), copper adze and axe were used for breaking rock. In the fifth century B.C. (the Warring States Period), iron axe, hammer, and drill were used ...
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Crushing: Rock fragmentation in the first stage was calculated based on the feed for the primary gyratory crusher, with d 80 range of the feed equal to 1524–2260 mm . There are multiple methods used to determine the dimensions of over-fragment rock and boulder.
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Therefore, fragmentation performance, quality rating, and fragment size distribution prediction for suitable crusher selection were investigated to bridge the gap of mismatched crushers in quarries.
WhatsApp: +86 18221755073