Some effects of accurate delay time on rock fragmentation have been examined numerically using a newly developed continuum damage model. Stress wave collision created by simultaneously initiating a continuous explosive column from opposite ends is simulated in both an axisymmetric environment and in bench blasting.
fragmentation on the ROM pad and the impact of rock fragmentation on the performance of the primary crusher. Traditionally, blast performance assessment in terms of fragmentation analysis have always been …
The effect of explosive type and delay between rows on fragmentation; M.S. Stagg et al. Effects on accurate delays on fragmentation for single-row blasting in a 6.7-m (22-ft) bench; R.F. Chiappetta Precision detonators and their applications in improving fragmentation, reducing ground vibrations and increasing reliability—A look into the future
This study presents an empirical method to determine the target fragmentation for efficient loading and crushing at the Aitik mine in Sweden. In the study, the loading efficiency of …
Geometric fragmentation effects have rarely been explicitly studied because theoreticians and empiricists have mostly focused on demographic fragmentation effects, while geometric effects are often qualitatively invoked, usually with references to habitat heterogeneity and the resulting beta diversity, to explain observed positive …
Effects of Habitat Fragmentation The multiple impacts of habitat fragmentation may significantly impact the resilience and efficiency of ecosystems. To counteract the adverse effects on ecosystem and biodiversity functioning, conservation activities must be directed at habitat restoration, wildlife corridor creation, and adopting sustainable ...
The effects of fragmentation on species will also be very different if one study is investigating different aspects of fragmentation—e.g., one examining "number of patches" and the other "edge density"—despite the fact that the two variables are often used interchangeably to describe fragmentation. The effects of habitat degradation ...
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 …
Blast-induced fragmentation has a significant influence on the operational efficiency of open pit mines, especially on loading and crushing, the two immediate tasks after blasting, according to this study. Blast-induced fragmentation has a significant influence on the operational efficiency of open pit mines, especially on loading and …
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 …
There are two major effects of blasting on fragmentation: (i) size distribution of the muckpile fragments and (ii) creation of microfractures in the fragments (Asgari and Farshad, 2015, Khademian et al., 2017, Shehu and Hashim, 2020, Ouchterlony, 2003). The former effect is seen and can be estimated directly by sieve analysis or image analysis ...
There are two major effects of blasting on fragmentation: (i) size distribution of the muckpile fragments and (ii) creation of microfractures in the fragments (Asgari and …
jaw crusher was recorded after each blasted rocks are fed. These measurements consisted of analysis of the particle size distribution of each muckpile after shots, and the …
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.
Ecologists agree that habitat destruction is detrimental to the maintenance of biodiversity, but they disagree—often strongly—on the extent to which fragmentation itself is to blame (4, 5).Early hypotheses based on the …
The fragmentation results then were paired with the crusher throughput values, and series of regression analysis were done in order to understand the effects of blast fragmentation on crusher ...
The effect of fragmentation on loading operations is significant. Ever since the 1980s, different researchers have tried to formulate or create models to find the effects of muck pile on loading. It was MacKenzie who first introduced a conceptual graph to illustrate the dependence of mining unit operations on fragmentation, and mentioned …
In this regard, the rock fragmentation distribution (RFD) caused by blasting was considered the main determinative criterion for providing the optimum conditions for the blasting operation at ...
the operation, including loading and crushing. The effects of fragmentation are first seen in loading; no matter what type of machinery is used, fragmentation plays a leading role in loading efficiency. A well-swollen muckpile with a fragmentation tailored to the type and size of the machinery will yield fewer passes and smoother, more ...
Forest fragmentation risk to birds. Short-winged birds are especially vulnerable to the effects of forest fragmentation. Because of their limited capacity to travel through gaps between wooded patches in search of mates and food, many species accustomed to living deep within rainforests perish in fragmented forestlands Weeks, T. …
The effects of blasting on crushing, grinding efficiency and energy consumption are discussed. The size of fragments is important …
The fragmentation rate and particle size distribution of the muckpile after blasting have important influences on the performance of subsequent mining activities …
Rock Quality Designation parameter has little effect on mill performance. • A method for estimating the crusher model parameters based on Axb value was introduced. Abstract. 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 ...
The observed effects of fragmentation on BEF relationships can be affected by the choice of temporal scale. On one hand, habitat fragmentation has a time delayed effect on biodiversity loss (Helm et al. 2006), where some tree species can still survive in forest fragments but there is no seedling recruitment in the understory (Cordeiro et al. 2009).
The block size index shows the average size of blocks at a given blast site before blasting. The resulting fragmentation (average fragment size, K 50) is compared with the original block size index I b.Ozkahraman [7] showed that there is a good linear correlation between K 50 and I b for the same type of limestones.. After the trial blasts, …
Fragmentation, the most common method for assessing blast efficiency, provides significant benefits to post-blast operations. The most important parameter affecting fragmentation in blasting is geological formation characteristics. This study aimed to investigate the blasting efficiency on different geological units in the blasting area …
As a common physical process in mining and other rock engineering industries, rock fragmentation is mainly induced by mechanical loading. To optimize the rock fragmentation process, many methods have been proposed to pre-condition the rock material. Heat-treatment is one such rock conditioning method to facilitate rock …
Since the efficiency of each crusher depends on the specific characteristics of its feed in terms of particle size distribution, ... Lourens, H. Measuring the effect of blasting fragmentation on hard rock quarrying operations. In Rock Fragmentation by Blasting; Mohanty, B., Ed.; CRC Press: London, UK, 1996; pp. 353–359. [Google Scholar]
Oversize fragments, or boulders, are the most undesired rock fragmentation in the mining industry. An oversize rock fragment can be defined as 'any fragment produced from primary blasting, that ...
