Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Explosion temperatures of metals and other elemental dust clouds.

Authors
Cashdollar-KL; Zlochower-IA
Source
Proceedings of the Sixth International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions, Halifax, NS, Canada, August 27 - September 1, 2006. Halifax, Canada: Dalhousie University, 2006 Aug; 1:98-113
Link
NIOSHTIC No.
20031124
Abstract
The Pittsburgh Research Laboratory of the National Institute for Occupational Safety and Health conducted a study of the explosibility of various metals and other elemental dusts, dispersed in air, with a focus on the experimental explosion temperatures. The data are useful for understanding the basics of dust cloud combustion, as well as for evaluating the explosion hazards in the minerals and metals processing industries. The dusts studied included boron, carbon, magnesium, aluminum, silicon, sulfur, titanium, chromium, iron, nickel, copper, zinc, niobium, molybdenum, tin, hafnium, tantalum, tungsten, and lead. The dusts were chosen to cover a wide range of physical properties - from the more volatile materials such as magnesium, aluminum, sulfur, and zinc to the highly "refractory" (very low volatility) elements such as carbon, niobium, molybdenum, tantalum, and tungsten. These flammability studies were conducted in a 20-L chamber, using strong pyrotechnic ignitors. The experimental data obtained included the minimum explosible concentrations, maximum explosion pressures, and maximum explosion temperatures. A unique multiwavelength infrared pyrometer was used to measure the temperatures. For the elemental dusts studied, all ignited and burned as air-dispersed dust clouds except for nickel, copper, molybdenum, and lead. The measured maximum explosion temperatures ranged from 1550 K for tin and tungsten powders to 2800 K for aluminum, magnesium, and titanium powders. The measured temperatures are compared to the calculated, adiabatic flame temperatures. In general, the dusts whose experimental temperatures were closer to the adiabatic values were those with the finer particle sizes, those that were more easily vaporized, and/or those that were intrinsically more reactive.
Keywords
Mining-industry; Particulates; Particulate-dust; Dust-particles; Analytical-processes; Explosive-dusts; Explosion-prevention; Metal-dusts; Metal-mining; Metallic-dusts
Contact
Kenneth L. Cashdollar, NIOSH, Pittsburgh Research Laboratory, P.O. Box 18070, Cochrans Mill Road, Pittsburgh, PA 15236
CAS No.
7440-44-0; 7439-95-4; 7429-90-5; 7704-34-9; 7440-32-6; 7439-89-6; 7440-02-0; 7440-50-8; 7440-66-6; 7439-98-7; 7440-31-5; 7440-58-6; 7439-92-1; 7440-42-8; 7440-47-3; 7440-03-1; 7440-21-3; 7440-25-7; 7440-33-7
Publication Date
20060827
Document Type
Conference/Symposia Proceedings
Email Address
KCashdollar@cdc.gov
Fiscal Year
2006
NTIS Accession No.
NTIS Price
NIOSH Division
PRL
Source Name
Proceedings of the Sixth International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions, Halifax, NS, Canada, August 27 - September 1, 2006
State
PA
TOP