· The Page Description. Sample of reported job titles: Blaster, Explosive Technician, Powderman,, to demolish structures or to loosen, remove, or displace earth, rock, or other materials, drill cuttings, admit water into boreholes, and tamp material to compact charg, Air compressors — Portable air compressors; Ammeters — Digital …
Read More· Wherever there are traces of explosives, even as small as a few picograms, there will be black spots. Trogler says that the advantage of this system is that the results can be interpreted visually ...
Read More· The detonation of a spherical charge in an infinite rock medium results in three major zones: (1) explosion cavity zone-where energy is liberated and the process is hydrodynamic; (2) transition...
Read More· One of these methods that has recently seen a dramatic increase in use is portable Raman spectroscopy, a vibrational spectroscopic method. It has been more than 5 years since the last reports on portable Raman spectroscopy for field detection of explosives [ 4 – 6 ], and there have been recent dramatic advances in portable Raman devices.
Read More· The amount of explosive needed greatly depends on the rock size. A range of 0.5 to 2 lb per cubic yard is a good estimate for use. Regulations in many states prevent initiating more than 10 lb at a time, but this amount should never be approached when blasting in the crusher. Multiple charges should not be necessary either.
Read More· The Non-Explosive Rock Breaking (NERB) research programme at the Mandela Mining Precinct aims to find a solution that will overcome this very inefficient way of mining and instead find ways of …
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Read More· The use of excessive explosives at a m ine site will result in full damage of the rock structure s and cause unwanted caving and large increases in support costs. 3.1 Factors of Blast design :
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Read Moreexplosive, any substance or device that can be made to produce a volume of rapidly expanding gas in an extremely brief period. There are three fundamental types: mechanical, nuclear, and chemical. A mechanical explosive is one that depends on a physical reaction, such as overloading a container with compressed air. Such a device has some …
Read More· Explosives spectral libraries are available for some of the portable Raman systems investigated—some are built in, and some must be purchased. A preferred long …
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Read More· A new, easy to use explosives detector developed by RedXDefense of Rockville, MD, could provide a quick, simple visual diagnostic for the plastic explosives favored by terrorists like Reid. The...
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Read MoreBlaster's Training Modules - Module 1 - Explosives. detonate, whereas "low explosives" deflagrate or burn. A high-explosives detonation provides both shock, which fractures (or …
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Read More· Powder factor can be defined as the quantity of explosives (kg) required to break a unit volume or tonne (t) of rock. The prospect of excavating rocks by blasting is characterized by a specific ...
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Read More· Gunpowder also known as black powder was the first generation of explosives used in all applications. About 1000 years ago, the Chinese invented these explosives, with the first European sources manufactured …
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Read More· The amount of explosive needed greatly depends on the rock size. A range of 0.5 to 2 lb per cubic yard is a good estimate for use. Regulations in many states prevent …
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Read More· Explosive A generates a compressive stress of 78 kbar at the blasthole wall whereas explosive B generates only 39 kbar. The variations of peak stress with …
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