PDF Rock breaking methods to replace blasting
Static expansion agent is a non-explosive po llution-free broken in the other broken rock method for crushing operations. Comparison of various non-explosive blast ing characteristics.
PAPER OPEN ACCESS Numerical simulation of rock fragmentation
rock fragmentation. The mean fragment size of rock should not too high or too low. This is because oversize rock and very fines rock will occur. Rock fragmentation plays a critical role in large-scale quarrying operations because of its direct effects on the costs of drilling blasting secondary blasting and crushing 1 2 3 .
Comparative analysis of hydraulic drop ball and secondary
Oversized rock fragmentation techniques are many but can be broadly classified into two: Ratan 2005 . i Those without the aid of explosives ii Those with the aid of explosives. The traditional method of secondary brakeage using explosive are popping and plaster blasting Smith 1999 . Popping consists of drilling a blast hole in the block
Day 2 1110 Explosive Characteristics Explosive Products SG V1.ppt
zVoD is a guide to determining the efficiency of the explosive. 9Comparison of VoD results should be done within the context of the ppg yp articular blasting situation i.e. same mine same rock type . For Example ANFO VoDs vary from 2500 to 4500 m/s 8200-14700 ft/s depending on hole diameter in the same rock.
Demolition Techniques - YouTube
Demolition Techniques: Non-Explosive Demolition Agent High Reach Arm Crane and Ball Implosion Saw Cutting Thermal Lance and Water Jet Enjoy the video
Blasting approaches to decrease greenhouse gas emissions in
The process requires knowledge of the exact lo ion of the coal seams and of the rock properties at the roof and floor of the coal seams to ascertain stand-off distances and the correct explosive energy where required. Coal seams as thin as 160 mm have been successfully recovered by careful blast design and adopting suitable excavation techniques.
Drilling and blasting - Wikipedia
Drilling and blasting is the controlled use of explosives and other methods such as gas pressure blasting pyrotechnics to break rock for excavation.It is practiced most often in mining quarrying and civil engineering such as dam tunnel or road construction.
Best practices: Drilling and blasting : Pit and Quarry
We really think quarries should manage these two activities as one. When these two are managed separately you are likely to get non-uniform rock fragmentation. If you combine the processes you can achieve a more uniform gradation that will make the crushing process easier down the production line.
Selection of inter-hole and inter-row timing for surface
where ERI is the explosive-rock interaction term; ρe is the density of the explosive g/cm3 ; D is the ac-tual non-ideal detonation velocity km/s ; vp is the P–wave velocity of the intact rock km/s and DCJ is the CJ detonation velocity km/s . In Equation 1 there are two fitting constants namely a and b. For the current database they are
CDC - Mining - Electrical Equipment Explosion Protection
Explosive Atm. hrs/year IEC/ISA and US NEC 505. Techniques Allowable. U.S. Mining Industry. Lo ion designation U.S. Mining Industry. Techniques required. Zone 0. Greater than 1000. IS - 2 fault Encapsulation. Inby last open. IS - 2 fault Explosion Proof XP Zone 1. Between 100 and 1000. IS - 1 fault Flameproof XP Powder Fill
a comparison of non explosive rock breaking techniques
Shape Memory Alloy Rock Splitters SMARS A Non-Explosive Method for Fracturing Planetary Shape Memory Alloy Rock Splitters SMARS —A Non-Explosive A comparison of these SMA -based methods and other techniques such as blasting for breaking rock can be found in Table 1 and Table 2 respectively.
Blaster& 39;s Training Modules - Module 1 - Explosives
1Many factors can cause an explosive to degrade. For example water in a borehole can corrupt an explosive like ammonium-nitrate fuel oil which isn’t water-resistant ammonium nitrate is hydroscopic and will dissolve in water . In a deep borehole pressure in the bottom can alter an explosive’s density by causing micro-balloons to be crushed.
Rock-breaking mechanism and experimental analysis of confined
The borehole surrounding rock is subjected to crushing damage when the high-pressure shock wave in the confined medium directly acts on the wall surface of borehole. At this stage the radius of compacting or crushing zones of borehole surrounding rock under the action of shock wave is concluded by Zhang and Dai : 1 r c = 2 σ c ξ 1 / 3 Cp
rock crushing techniques - schoonwatervoormozambique.nl
The Crushing action of a cone comes from eccentric motion of the shaft or head There are two basic cone types bushing or bearing The bearing cones run cooler and more efficient thus putting more of the applied Hp to work crushing rock rather than creating heat. Get Price A Comparison Of Non explosive Rock crushing Techniques
1 A COMPARISON OF NON-EXPLOSIVE ROCK BREAKING TECHNIQUES
The comparison study is aimed towards quarry and mining personnel intending to use a non-explosive product for rock breakage but not sure which product suits their situation best. Each product works on a slightly different principle but the main similarity is that they all use high pressure gas with which to break the rock.
Controls on explosive-effusive volcanic eruption styles
Despite a range of different techniques used to estimate these ascent or decompression rates Fig. 5 and Supplementary data 1 there is a distinction between rates of effusive versus explosive
Blasting and Explosives Quick Reference Guide 2010
Blasted tonnes T = V x Density of rock in t/m3 Volume of blasthole Vb = π x D2/4000 x L Mass of explosive per hole kg = Volume of hole length charged x Explosive density PF 3 kg/m = Total explosives in the blast/volume of rock blasted for kg/Tonne divided by blasted tonnes T RWS = AWS of explosive/AWS of ANFO x 100
The Static Breaking Technique for Sustainable and Eco
However due to the prohibition of utilizing the explosive device for rock breaking in the goaf of highly gassy mine it is inappropriate to tackle the issue in this way. In this paper the static crushing technique is first introduced to provide solution to the issue of top tray.
Comparison of elemental analysis techniques - advantages of
Each of these techniques has a number of advantages and disadvantages giving the analyst the flexibility to choose which technology suits best. When the required limits of quantifi ion are above 1 ppm µg/g or when the non-destructive analysis is required XRF is a very attractive technique that should be considered especially when
A COMPARISON OF NON-EXPLOSIVE ROCK BREAKING TECHNIQUES
a range of situations. The comparison study is aimed towards quarry and mining personnel intending to use a non-explosive product for rock breakage but not sure which product suits their situation best. Each product works on a slightly different principle but the main similarity is that they all use high pressure gas with which to break the rock.
A comparison of non-explosive rock breaking techniques
The University of Queensland& 39;s institutional repository UQ eSpace aims to create global visibility and accessibility of UQ’s scholarly research.
Thermal influences on spontaneous rock dome exfoliation
A comparison of 2 years of our temperature data daily averages from Onset Hobo pendent-type data loggers recording near-surface rock temperature at Twain Harte Dome with that from the Sonora
rock crushing techniques - rndi.it
Rock Crusher Techniques saraswathielamakkaraorginRock Crusher Techniques anreximin crusher rock crusher techniqu a crusher is a machine designed to reduce large rocks into smaller rocks gravel or rock Portable Rock Crushers Patriot mining and equipmentPortable Rock Crushers contact us copies of my design I offer technical support and parts If you buy one of my units I offer free advice
BULK EMULSION EXPLOSIVE - A STUDY - MAFIADOC.COM
More powerful explosive in the drillholes gives for example finer fragmentation and a faster flow of rock through the loadinghauling-crushing operation. After many years of experience in huge operations with large hole diameters up to 12 1/4" Nitro Nobel now also has systems available for small diameter blastholes down to 64 mm .
Drilling Techniques for Mining Exploration - Equipment
View the complete article here. By its very nature mineral exploration involves drilling to discover what is below the surface. While there have been a number of advances in drilling technologies in drilling techniques in the petroleum and geo-thermal sector in mining there have been no significant advances in mineral drilling technology for decades.
3 Technologies in Exploration Mining and Processing
Comminution i.e. the breaking of rock to facilitate the separation of ore minerals from waste combines blasting a unit process of mining with crushing and grinding processing steps . In-situ mining which is treated under a separate heading in this chapter is a special case that combines aspects of mining and processing but does not
Drilling and Blasting - an overview ScienceDirect Topics
Sand and gravel or rock rubble at the mine face are transported by truck or conveyor to a processing plant. The material is crushed passed over a screening device and sorted according to size Fig. 9.2 . The crushing screening and sorting process is repeated until the proper mix of particle sizes is reached.
Expansive Rock Breaking Non-Explosive Demolition Agent
Using a non-explosive product for rock and concrete breaking completely eliminates flyrock noise vibration from blasting human discomfort and structural damage related to air blast overpressure. Compared with conventional concrete and rock breaking methods Expanding Grout is safe easy-to-use and cost-effective.
Non-explosive rock breaking system - YouTube
CO2 liquid-gas expansion to crack rocks non-explosive excavation a tube can break hard-rocks 50-80m cube suitable for foundation pit excavation mountain excavation valued metal ore etc
- oreballmills output/index.html
a comparison of non explosive rock crushing techniques