Coal Age

JUL 2015

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not on the rock dust functionality itself, allowing operators to only reapply when the other parameters are out of compliance. In the U.S., there are also some major compliance concerns about new regula- tions regarding respirable dust. In this light, added value with Imerys' marble-based rock dusts is that they contain less res- pirable dust than most limestone-based products. Even with a slight increase in the fine particle sizes for the new moisture-tol- erant product, Imerys' rock dust products still provide an improved option in compar- ison to many of the limestone-based prod- ucts currently on the market. Additionally, with the concerns about current rock dusts expressed by NIOSH and MSHA in mind, this new moisture-tolerant product was developed to meet or exceed the health and safety expectations of current rock dust products available within the U.S. Imerys also believes that the new mois- ture-tolerant dust with its enhanced perfor- mance can contribute to improved mine safety in the worldwide mining industry. What's Next? With the new moisture product heading for production and availability in late 2015, live mine trials are being undertaken to further explore the cost-savings impact of the prod- uct on coal mines and the industry overall. Imerys and others who have seen the mate- rial in action believe the product to be the beginning of a new era in rock dust func- tionality. Even with the respirable dust chal- lenges facing the U.S. coal mining industry today, the improved functionality provides a new level of safety for miners that might inspire a change in the way American coal miners look at rock dust usage. This article was written and submitted by Imerys. The research was supported by the National Institute for Occupational Safety and Health (NIOSH) under contract No. 200-2012-52496. The author acknowl- edges the contributions of NIOSH researchers from the Fires and Explosion Branch in providing information on the testing and mine conditions throughout the course of this contract. References *Table courtesy of NIOSH Elzbieta, Vogt (2010). Hydrophobized Limestone Powder as an Antiexplosive Agent, Faculty of Energy and Fuels, AGH – University of Sciences and Technology, A. Mickiewicza 30, 30 -059 Krakow, Poland. ASTM E1226 (2010). Standard Test Method for Explosibility of Dust Clouds, In Annual book of ASTM standards, vol. 14.02, West Conshohocken, PA: ASTM International. Cashdollar, KL (1996). Coal dust explosibility. J Loss Prev Process Ind 9:65-76. Cashdollar, KL (2000). Overview of dust explosibility characteristics. J Loss Prev Process Ind 13:183-199. Man, CK and Harris, ML (2014). Participation of large particles in coal dust explosions. J Loss Prev Process Ind 27:49-54. Mangulkar M. N., Dr. Jamkar S. S. (2013) Review of Particle Packing Theories Used For Concrete Mix Proportioning. International Journal of Scientific and Engineering Research. Vol 4, Issue 5 – May 2013. July 2015 www.coalage.com 55 o p e r a t i n g i d e a s c o n t i n u e d 32%R[%ODQG6WUHHW%OXHÀHOG:9 WI LQIR#EOXHÀHOGFKDPEHUFRPZZZEOXHÀHOGFKDPEHUFRP September 16 – 17 – 18, 2015 Brushfork Armory-Civic Center %OXHÀHOG:HVW9LUJLQLD © "A Coal Show For Coal People" Sponsored by:

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