Poducts>understanding and controlling coal damage during cast blasting including
understanding and controlling coal damage during cast blasting including
Modeling Coal Seam Damage in Cast Blasting UNT Digital
08/05/2020· It is also refereed to as coal damage. Chilling is caused during a blast by a combination of explosive shock energy and movement of the adjacent rock. Chilling can be minimized by leaving a buffer zone between the bottom of the blastholes and the coal seam or by changing the blast design to decrease the powder factor or by a combination of both. Blast design in coal mine cast blasting is usually a compromise between coal damage
Modeling Coal Seam Damage in Cast Blasting (Conference
It is also refereed to as coal damage. Chilling is caused during a blast by a combination of explosive shock energy and movement of the adjacent rock. Chilling can be minimized by leaving a buffer zone between the bottom of the blastholes and the coal seam or by changing the blast design to decrease the powder factor or by a combination of both. Blast design in coal mine cast blasting is usually a compromise between coal damageОнлайн-запрос
Controlling Block Movement of Coal During Overburden Blasting
THAT PROMOTE COAL LOSS DURING OVERBURDEN BLASTING WERE IDENTIFIED AND GUIDELINES TO MINIMIZE MOVEMENT WERE DEVELOPED . Large open pit coal mines consume a significant volume of explosives in removing the overburden above thecoal. Many mines use cast blasting to reduce the quantity of waste material handled by draglines. This technique utilizes theОнлайн-запрос
Cast Blast Design MiningInfo
Cast blasting is a type of blast design which utilizes the surplus explosive energy to move overburden material across the pit. It is most frequently employed in coal mines to remove overburden...Онлайн-запрос
Development and Application of Blast Casting Technique in
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Controlling the Adverse Effects of Blasting
Controlling the Adverse Effects of Blasting This module addresses the control of offsite impacts that result from blasting, local levels and applied to non -coal blasting operations such as quarrying and construction. Part I: Ground Vibrations, Airblast, and Flyrock . Explosive energy is used to break rock. However, the use of this energy is not 100-percent efficient. Some of the energyОнлайн-запрос
Measurement of blast damage Office of Surface Mining
ing and understanding the damage and its genesis. Few mines practice routine damage monitoring and qual ity control. Mining-induced damage and its impact Damage to a rock mass is consid ered to be the reduction in its integ-There is no straightforward and systematic method for adequately measuring blast damage in on-go ing mining operations. This paper considers various techniques availОнлайн-запрос
Recovering Revenue Through Coal Loss Protection
overburden blasting, specifically cast blasting increases the likelihood of coal damage and loss, leading to a negative economic impact on operations. In December 2002 DynoConsult, the consulting arm of Dyno Nobel Explosives, was awarded the ACARP Project C11051 – Controlling Block Movement of Coal During Overburden Blasting.Онлайн-запрос
Case Study Cast Blasting Orica Mining Services
Larger diameter (229mm) is better suited for cast blasting for improved cast and cost. Cost analysis showed that designs with larger diameter blast holes lead to reduced mining cost and faster coal uncovery rate. The overall result of the first cast shot was excellent and Peabody Wilkie Creek Mine is continuing to see benefits of this project.Онлайн-запрос
Understanding Blast Vibration and Airblast, their Causes
Understanding Blast Vibration and Airblast, their Causes, and their Damage Potential Author: Wesley L. Bender This document was originally presented at the Spring 2006 and Fall 2007 workshops of the Golden West Chapter of the International Society of Explosives Engineers and has been updated and revised to include new material.Онлайн-запрос
Blasting Impact Simulation Test and Fragmentation
Compared with the cost of coal mining in an open-pit coal mine, the cost of dust control (including economic cost and time cost) is much larger. Therefore, the final effect of blasting requires that dust pollution in pits be reduced as much as possible. Thus, the percentage of powder fragment mass should be controlled within a reasonable range of 10%. Based on the above two principles, thisОнлайн-запрос
Health and environmental impact of the coal industry
During combustion, the reaction between coal and the air produces oxides of carbon, including carbon dioxide (CO 2, an important greenhouse gas), oxides of sulfur (mainly sulfur dioxide, SO 2), and various oxides of nitrogen (NO x).Because of the hydrogenous and nitrogenous components of coal, hydrides and nitrides of carbon and sulfur are also produced during the combustion of coal in air.Онлайн-запрос
Blasting Safety – Revisiting Site Security
In a coal mine blast, flyrock traveled 900 feet and landed beyond the permit boundary causing a fatal injury [MSHA, 1990a]. During a construction blasting operation near Marlboro, NY, flyrock was showered on passing motorists on Route 9 W about 180 feet from the blast pit. This incident resulted in property damage and injury.Онлайн-запрос
An Analysis and Prevention of Flyrock Accidents in Surface
consumption of explosives and blasting agents during the year 2002 was about 5.53 billion pounds. Flyrock is always a major concern for the blaster. Flyrock from surface blasting operations has caused serious injury and death to employees and other persons. Injuries due to flyrock and the lack of blast area security accounted for over two-thirds of all blasting -related injuries in surfaceОнлайн-запрос
Citizen's Guide to Coal Mine Blasting in Indiana
may be available to accompany the citizen during the review of the records. Cast Blasting Cast blasting is a type of blast design that uses the explosive energy to move overburden material across the pit. This technique allows approximately 25% to 50% of the rock to be moved without the use of mine equipment. This is a major cost savings to theОнлайн-запрос
Protecting Workers from the Hazards of Abrasive Blasting
equipment (PPE), including respiratory protection, and training to protect workers involved in abrasive blasting activities. Engineering controls, such as substitution, isolation, containment, and ventilation are the primary means of preventing or reducing exposures to airborne hazards during abrasive blasting operations. Administrative controls, including the use of good work and personalОнлайн-запрос
JAn 203 1 of 21 Surface Blasting Safety Procedures
Surface Blasting Safety Procedures I PurPose Control risks related to storage, transportation, handling and use of explosives, blasting accessories and agents. 2 scoPe This procedure applies to all Surface operating areas and all employees and contractors. 3 DefInItIons Attended The presence of an individual to prevent unauthorized entry or access. Authorized Personnel Those employees thatОнлайн-запрос
Blasting and Explosives Quick Reference Guide 2010
Presplit blasting Spacing = Hole diameter x 12 Burden = 0.5 x production blast burden (B) Uncharged length at top = 10 x D Powder factor = 0.5kg per square metre of face Do not stem holes. Fire all holes on the same delay, or in groups of ≥ 5 holes Smooth Blasting Spacing = 15 x Hole diameter (hard rock) 20 x Hole diameter (soft rock)Онлайн-запрос
explosives – Mining and Blasting
There may not be a perfect answer, but electronic blasting will reduce damage. When electronic blasting accuracy is applied by expert engineers, vibration at the highwall can be dramatically reduced. The underlying stability problems that develop into fall of ground can effectively be prevented. This, too, is an engineering control; and when combined with best practice geotechnical design andОнлайн-запрос
Drill and Blast Method railsystem.net
Drill and Blast Method. Drill and blast method is mostly used method for the excavation throughout the world. The method can be used in all types of rocks and the initial cost is lower than the mechanical method like TBM. This tunneling method involves the use of explosives. Compared with bored tunneling by Tunnel Boring Machine, blasting generally results in higher duration of vibrationОнлайн-запрос
JAn 203 1 of 21 Surface Blasting Safety Procedures
Surface Blasting Safety Procedures I PurPose Control risks related to storage, transportation, handling and use of explosives, blasting accessories and agents. 2 scoPe This procedure applies to all Surface operating areas and all employees and contractors. 3 DefInItIons Attended The presence of an individual to prevent unauthorized entry or access. Authorized Personnel Those employees thatОнлайн-запрос
Abrasive blasting: Know the hazards | 2017-02-26 | Safety
Abrasive blasting also creates large amounts of dust, which may be toxic depending on the materials used. Commonly used abrasive materials include silica, coal slag, crushed glass or glass beads, and steel grit. Inhalation of silica dust can result in silicosis, lung cancer and other breathing problems; coal slag may result in lung damage; andОнлайн-запрос
Maritime Guidance Documents | Abrasive Blasting Hazards
Control measures to prevent these injuries include: (1) never pointing a blast nozzle at a person; (2) using a dead-man control device at the nozzle end of the blasting hose; (3) ensuring, where possible, that only one employee operates each blast nozzle; (4) installing guards to protect the operator from high-speed particles; (5) conducting abrasive blasting in a blasting enclosure or an areaОнлайн-запрос
Environmental Impacts of Blasting and Mitigating
The coal mine gas has a positive role in the coal blast damage. Near the blasting area, the blast wave is the main reason of blast damage, which makes the blast damage decrease rapidly. HoweverОнлайн-запрос
4 Coal Mining and Processing | Coal: Research and
During this time, coal The likelihood of deeper mines in the future means that there has to be increased attention to methane control (including methane capture before, during, or after mining), dust control, ignition sources, fires, and explosions. Recent disasters have shown that there are major knowledge gaps and technology needs in the areas of escape and survival, and emergencyОнлайн-запрос
How Coal Works | Union of Concerned Scientists
15/12/2017· While coal mining has long caused environmental damage, the most destructive mining method by far is a relatively new type of surface mining called mountaintop removal, or MTR. Currently practiced in southern West Virginia, southwestern Virginia, and eastern Kentucky, MTR requires stripping all trees from a mountaintop and blasting away the top several hundred feet with explosives.Онлайн-запрос
(PDF) Environmental and social impacts of mining and their
scientific control blasting technique to reduce . its impact on the environment in opencast . and underground mining activities of Jharia . coalfields of Dhanbad, India Several studies . haveОнлайн-запрос
COURSE OUTLINE engineering.unsw.edu.au
o open pit coal blasting o underground blasting o special blasting techniques management of blast damage cast blasting secondary blasting o blast fragmentation and analysis o environmental management o relevant legislation and standards . COURSE OUTLINE 4 MINE3630 ROCK BREAKAGE 3. AIMS, LEARNING OUTCOMES & GRADUATE ATTRIBUTES Course Aims This course aims toОнлайн-запрос
Drill and Blast Method railsystem.net
Drill and Blast Method. Drill and blast method is mostly used method for the excavation throughout the world. The method can be used in all types of rocks and the initial cost is lower than the mechanical method like TBM. This tunneling method involves the use of explosives. Compared with bored tunneling by Tunnel Boring Machine, blasting generally results in higher duration of vibrationОнлайн-запрос
explosives – Mining and Blasting
There may not be a perfect answer, but electronic blasting will reduce damage. When electronic blasting accuracy is applied by expert engineers, vibration at the highwall can be dramatically reduced. The underlying stability problems that develop into fall of ground can effectively be prevented. This, too, is an engineering control; and when combined with best practice geotechnical design and