Explosives Research and Testing Experimental Coal Mine and Dust Explosions Research This circular summarizes the research and technologic activities and publications of the Federal Bureau of Mines Division of Explosives Technology during fiscal year 1959 July 1 1958 June 30 1959 Part I briefly describes the programs that were active
Get Price1 Introduction Float coal dust presents a major explosion hazard in underground coal mines Modern mining methods have been shown to produce finer coal dust than in the 1920s Sapko Cashdollar Green 2007 order to mitigate this risk pulverized rock dust is required to be applied generously to the intake return and belt airways/entries
Get PriceThe Coal Mines Precautions Against Inflammable Dust Regulations 1956 set out requirements for the maintenance of incombustible matter in mine roadway dust including sampling sample analysis type of analysis and keeping records of analyses The regulations also contain requirements relating to barriers to the extension of flame
Get PriceAmerican standard practice for rock dusting underground bituminous coal and lignite mines to prevent coal dust explosions ASA Standard M13 1 1960 UDC 622 81 By United States Bureau of Mines
Get PriceYour Rock Dusting Solution For Mitigating Coal Dus Your rock dusting solution for mitigating coal dust explosions the potential for coal dust explosions in underground coal mines must be mitigated by a generous application of rock dust usually in the form of limestone if an explosion does occur the rock dust disperses and mixes with the
Get PriceApply Liberal Quantities of Rock Dust Generous applications of rock dust can prevent the propagation of coal dust explosions The law requires that all areas of a coal mine that can be safely traveled must be kept adequately rock dusted to within 40 feet of all working faces These are minimum requirements REMEMBER
Get PriceCoal dust explosions in underground coal mines are prevented by generous application of rock dust usually limestone If an explosion should occur the rock dust disperses mixes with the coal dust and prevents flame propagation by acting as a thermal inhibitor or heat sink
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Get PriceRecommendations for a New Rock Dusting Standard to Prevent Coal Dust Explosions in Intake Airways Kenneth L Cashdollar Michael J Sapko Eric S Weiss Marcia L Harris Chi Keung Man P Harteis and Gregory M Green DEPARTMENT OF HEALTH AND HUMAN SERVICES Centers for Disease Control and Prevention
Get PriceThe workings of a bituminous coal mine produce explosive coal dust for which adding rock dust can reduce the potential for explosions Accordingly guidelines have been established by the Mine Safety and Health Administration MSHA about the relative proportion of rock dust that must be present in a mine s intake and return airways
Get Pricetechnical reports and regulatory standards relating to coal dust explosions and 1 Stone dusting or rock dusting is the application to roadway surfaces of an inert dust usually limestone dust in amounts that render any coal dust incombustible
Get PriceCoal dust explosions occur when fine coal particles become airborne and are ignited by some means In a coal mine the precursor to a coal dust explosion is usually the ignition and explosion of a quantity of methane explosive in the range of 5 to 15 Due to the confinement of the roadway a pressure wave is created which causes fine coal
Get PriceMitigating coal dust explosions in modern underground coal mines In Panigrahi DC ed Proceedings of the Ninth International Mine Ventilation Congress New Delhi India pp Harris ML Weiss ES Man C Harteis SP Goodman GV Sapko MJ 2010 Rock dusting considerations in underground coal mines
Get PriceProper rock dusting practices have proven to be an effective means of preventing coal dust explosions Rock dust generally pulverized limestone dust serves as a heat sink material that prevents or suppresses a propagating coal dust explosion through the absorption of thermal energy from the heated gases and absorption of radiant energy which reduces the preheating of unburned coal particles
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Get PriceRock dusting to prevent coal dust explosions has been in widespread use in U S underground coal mines since the early 1900s out of bulk solution and depositing on the dust surface when the
Get PriceRecommendations for a New Rock Dusting Standard to Prevent Coal Dust Explosions in Intake Airways 5/1/2010Reports of Investigations This NIOSH report presents the results of extensive in mine coal dust particle size surveys of dust samples collected from intake airways in 61 U S coal mines representing all 10 MSHA bituminous Coal Mine
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Get PriceCurrent practices of protection against coal dust explosions propagating through mines are examined and found to be basically methods of cooling flames below the temperature limits for flame propagation Such is the case with rock stone dusting and with passive barriers extinguishant dispersed by the explosion using rock dust or water
Get Priceof fine sized float coal dust on the floor ribs and roof of mine entries and returns coupled with the intermittent application of rock dust has resulted in stratified layers of dust Sapko Weiss Watson 1987a Over the years changes in mining technology have produced increased amounts of finer float coal dust which has compounded
Get PriceIf your assistant knows all the nuances of material design and essay help Recommendations For A New Rock Dusting Standard To Prevent Coal Dust Explosions In Intake Airways National Institute For Occupational Safety And Health is not too difficult for a professional then the end Recommendations For A New Rock Dusting Standard To Prevent Coal
Get PriceAs an explosion control measure rock dusting has been used in underground coal mines in many major coal producing countries with different standards The effectiveness of the rock dust in reducing explosion intensity has been proven by historic events and laboratory experiments The main functions of rock dust in controlling mine explosions i e isolator physical heat sink and chemical
Get PriceThis report summarises the findings of assessments undertaken in relation to the risk of coal dust explosion in underground coal mines These assessments commenced in October 2016 and to date have been completed at 16 mines The targeted assessment is an in depth look at the control measures for coal dust explosion and their implementation
Get PriceRecommendations for a new rock dusting standard to prevent coal dust explosions in intake airways by Kenneth L Cashdollar 2010 Department of Health and Human Services Centers for Disease Control and Prevention National Institute for Occupational Safety and Health Office of Mine Safety and Health Research edition in English
Get PriceTo further reduce the risk of flour dust explosions it is important to make physical modifications to the equipment and factory For instance factories are encouraged to improve their ventilation and install a dust extraction system A major part of this is using a HEPA vacuum to efficiently clean up 99 8 of the combustible dust
Get PriceDust Explosions occur when all five of the legs of the Dust Explosion Pentagon are present 1 FuelCombustible Dusts serve as fuel for combustion Examples include grain dust plastics cornstarch coal wood dust and metals 2 OxygenAir is the most common oxidizing medium O 2 must be present in
Get PriceResearch on those methods for mitigating coal dust explosions is less extensive than the volume of research available on more typical rock dust applications PARTICLE SIZE DISTRIBUTIONS OF ROCK DUST Most of the commercially available rock dust is composed of limestone or marble although regulations allow for other materials see Table 2 1 As the particle size distribution of rock dust is important for its ability to mitigate coal dust explosions
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Get PriceFor higher rates of coal dust fallout the optimum stone dust application rates required to achieve satisfactory inerting were found greatly depending upon the total rate of coal dust fallout and the strategy of stone dusting employed Typical values in the order of 1000kg/ktonne may be required for mines with very high coal dust makes
Get PriceRecommendations for a New Rock Dusting Standard to Prevent Coal Dust Explosions in Intake Airways Sapko Michael J Weiss Eric S Harris Marcia L Amazon Books
Get Price1 Introduction Coal dust explosions in underground coal mines are among the deadliest mining disasters The Mine Health and Safety Administration MSHA classifies any mining accident that claims 5 or more lives as a mining disaster Since 1970 21 coal mine disasters have occurred in the United States 15 of these have been categorized as explosions this accounts for 71 of all coal mine
Get PriceKenneth L Cashdollar is the author of Recommendations for a New Rock Dusting Standard to Prevent Coal Dust Explosions in Intake Airways 0 0 avg rating
Get PriceWet rock dusting is performed by mixing rock dust with water and spraying it on the roof and ribs However once the wet mixture dries the rock dust may cake preventing it from being adequately dispersed to inert a propagating explosion
Get PriceDust explosions represent a serious concern to chemical processing and manufacturing industries This chapter reviews dust explosion loss history throughout the United States Europe and Asia Illustrative dust explosion incidents are highlighted in grain handling food processing coal mining wood processing metal working and pharmaceutical
Get Pricegiven as well to shed light on the dusting process together with rock dust surface chemistry modification KEYWORDS Rock Dust Surface Chemistry Modification Coal Mine Explosion Mitigation Dispersibility Date Author s name Qingqing Huang 04/28/2016
Get PriceRock Dusting Definition of Rock dust Pulverized limestone dolomite gypsum anhydrite shale adobe or other inert material preferably light colored 100 percent of which will pass through a sieve having 20 meshes per linear inch and 70 percent or more of which will pass through a sieve having 200 meshes per linear inch the particles of which when wetted and dried will not cohere to form
Get PricePDF As an explosion control measure rock dusting has been used in underground coal mines in many major coal producing countries with different Find read and cite all the research you need
Get PriceNIOSH Report of Investigations 9679 Recommendations for a New Rock Dusting Standard to Prevent Coal Dust Explosions in Intake Airways K L Cashdollar et al May 2010 Federal Register Vol 76 No 119/June 21 2011/Rules and Regulations p 35 968 NIOSH Hazard ID Non Conforming Rock Dust HID 16 October 2011
Get Pricesize coal dust <38 m and the coarsest mine size coal dust <850 m required 90 and 72 rock dust inertant respectively for suppressing the coal dust explosion
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