Nov 17, 2016· PRIMING OF EXPLOSIVES FOR EFFICIENT BLASTING. 1. INTRODUCTION: ... It is a specially manufactured explosive that can produce a high velocity of detonation (VOD) such as cast boosters that have VOD of 7,600 m/s. ... Doubleprimer placement was tested successfully in various mines by using electronic detonators, aiming to improve rock fragmentation.
Get PriceRules, Regulations, Research and Resources. The Federal Surface Mining Control and Reclamation Act of 1977 requires that coal mine blasting be limited based on the site conditions so as to prevent: injury to persons, damage to public or private property outside the permit area, adverse impacts on any underground mine, and change in the course, channel, or availability of surface or ground ...
Get PriceDetonation velocity is a primary quality characteristic in explosives. If an explosive does not provide sufficient power, it can have a considerable effect on blast results. The MREL HandiTrap II is an easytouse and affordable system for measuring detonation velocity for an explosive sample or blasting column in a single blasthole.
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Get PriceIn holes, the measurement of the velocity of detonation (VOD) helps in comparing and evaluating relative performance of explosives. In this paper a blast performance assessment was conducted based on the results obtained from the steady state VOD measurement of emulsion explosives HEF100 and degree of blast fragmentation conducted on an open pit blast.
Get PriceChapter 1: The Fundamentals of Blast Physics Proud Institute of Shock Physics Centre for Blast Injury Studies, Imperial College London, London, SW7 2AZ Overview The basis of blast injury lies in the effects of an explosion and by extension in the use of explosives.
Get PriceDetonation wave propagation in underground mine entries . Alex C. Smith Michael J. Sapko . National Institute of Occupational Safety and Health, USA . ABSTRACT: A series of explosive detonation experiments was conducted in NIOSH’s Bruceton and Lake
Get PriceDetonation An explosive reaction that moves through an explosive material at a velocity greater than the speed of sound in the material. Detonation Velocity The velocity at which a detonation progresses through an explosive. Detonator Any device containing any initiating or primary explosive that is used for initiating detonation.
Get PriceDec 01, 2012· Mining, Quarrying Prospecting: How to spoof ANFO into having …. Dec 17, 2010 · It is a well known fact that in blasting the best rock breakage occurs when the detonation velocity (DV) of the explosive matches the speed of sound … »More detailed
Get PriceMar 01, 2019· ANFO has found wide use in coal mining, quarrying, metal mining, and civil construction in undemanding applications where the advantages of ANFO’s low cost and ease of use matter more than the benefits offered by conventional industrial explosives, such as water resistance, high detonation velocity, and performance in small diameters.
Get Priceby the detonation of explosives. Prediction of the amount and concentration of blasting fumes is important for underground mines to provide enough ventilation to ensure worker safety. The production of toxic fumes in open pit mines is a significant hazard to workers and surrounding communities because
Get Priceresulted in the variation of detonation velocity from 3262 to 4624 m/s. Keywords: Blasted muckpile, detonation velocity, emulsion explosives density, opencast mines. THE primary objective of blasting in a mine is to properly fragment the rock mass so that the muckpile can be efficiently and economically excavated, loaded and trans
Get PriceEXPLOSION HAZARDS OF AMMONIUM NITRATE UNDER FIRE EXPOSURE by R. W. Von Doloh, 1 C. M. Moson, 2 F. Perzak, 3 J. E. Hay, 4 and D. R. Forshey5 ABSTRACT An attempt has been made in this investigation to define the conditions under which ammonium nitrate (AN) might detonate as a result of involvement in fire.
Get PriceDetonation pressure is important for fragmentation design. In hard, massive rock formations, it is better to use an explosive with a high detonation pressure for fracturing the rock, and a lower detonation pressure explosive in softer and more fractured rock masses. The detonation pressure can be calculated using the formula below:
Get PriceVelocity of detonation of AN base blasting agent with addition of hay and recycled rubber ... explosives and emulsion explosives due to satisfactory detonation properties make the bulk of ...
Get Pricemining industry this velocity varies from 1600 m/s even up to 7600 m/s for the explosives used in boosters and detonating cords. Since the detonation velocity strongly depends on the explosive’s diameter [5], the present paper gives test results revealing the influence of the explosive charge diameter on the velocity of detonation.
Get Pricesituations may also require the adoption of a higher velocity, more energetic explosive. Where drilling and blasting conditions are both severe, the operator should use premium explosives, at least in the bottom one third of the drill hole. Clearing the toe, and therefore contributing to a smoother floor, is a major asset to improve BLAST DESIGN
Get PriceDec 11, 2015· Blast Pattern Parameters Burden The BURDEN is the distance from a single row to the face of the excavation, or between rows in the usual case where rows are fired in sequence. The proper burden dimension to use in any given individual blast can be calculated by taking into account hole diameter, relative rock density, and…
Get Priceinitiate detonation) Varies with composition, diameter, temperature and pressure High Explosive () defined as sensitive to No 8 strength detonator or 25 gr/fr cord, Blasting Agent requires a booster for initiation Can be altered by incorrect use Some blasting …
Get Price46 AEL Intelligent Blasting PACKAGED EXPLOSIVES Magnum® Drygel is a doped Watergel explosive. The high content of TGAN results in a cartridge with a muchimproved rheology when compared with the rheology of traditional Watergel explosives.
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Get PriceRapid the detonation process, the quicker the energy release from explosives mass, in the form of a shockwave followed by gas pressure, is applied to the borehole wall. In other words, faster the detonation velocity of the explosive, quicker is the energy …
Get PriceThe Explosives Used in Mining . ... A single type of explosives was therefore used as a propellant for guns and for blasting purpose in any military, mining and civil engineering application. ... Two different kinds of reactions (deflagration and detonation) allow distinguishing between the …
Get PriceMar 01, 2019· The evolution of safety in mining is long and storied. Some notable examples; the ongoing development of large mining equipment, or electronic blast detonation systems, has a sweeping and dramatic effect on the industry. Safety also increases through strategy and technique.
Get Pricetypically used in surface coal mining to fracture the rock). After blasting, a dragline, shovels, trucks, or other heavy equipment remove the rocky overburden to expose the coal seam. CITIZENS GUIDE TO COAL MINE BLASTING IN INDIANA Indiana Department of Natural Resources Division of …
Get PriceA NonIdeal Detonation Model for Evaluating the Performance of Explosives in Rock Blasting By S. Esen Minerals Process Technology AsiaPacific, Brisbane, Australia Received June 14, 2006; accepted September 21, 2006 Published online December 5, 2006 SpringerVerlag 2006 Summary
Get PriceAug 28, 2014· MineSight at Goldcorp’s Penasquito mine, Zacatecas, Mexico A blasting sequence at Goldcorp’s Penasquito silvergold mine, where MineSight is integral to mine …
Get Pricebeen studied over the years and modern mining methods have risks of blasting under most conditions. ... The aim of this Code of Practice is to provide information and recommended guidelines to assist in the prevention and ... Gases generated by the detonation of explosives during blasting.
Get PriceExplosive velocity, also known as detonation velocity or velocity of detonation (VoD), is the velocity at which the shock wave front travels through a detonated data listed for a specific substance is usually a rough prediction based upon gas behavior theory [citation needed] (see ChapmanJouguet condition), as in practice it is difficult to measure [citation needed].
Get PriceNov 17, 2016· PRIMING OF EXPLOSIVES FOR EFFICIENT BLASTING. 1. INTRODUCTION: ... It is a specially manufactured explosive that can produce a high velocity of detonation (VOD) such as cast boosters that have VOD of 7,600 m/s. ... Doubleprimer placement was tested successfully in various mines by using electronic detonators, aiming to improve rock fragmentation.
Get PriceThe Influence of Time on the Density and Detonation Velocity of Bulk Emulsion Explosives – a Case Study from Polish Copper Mines Piotr Mertuszka, 1* Krzysztof Fuławka, Mateusz Pytlik,2 Jarosław Wincenciak,3 Andrzej Wawryszewicz3 1 KGHM Cuprum Ltd. Research and Development Centre, 28 Sikorskiego Street, 53659 Wrocław, Poland
Get PriceBlasting injuries in surface mining with emphasis on flyrock and blast area security Abstract Problem: Blasting is a hazardous component of surface mining. Serious injuries and fatalities result from improper judgement or practice during rock blasting.
Get PriceVelocity of detonation (VOD) is one of the most important properties of explosives and indicates performances of explosives in real time. With the development of blast monitoring systems, continuous VOD monitoring systems are recently available.
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