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Examination of water spray airborne coal dust capture with three wetting agents.

Authors
Organiscak-JA
Source
2013 SME Annual Meeting, February 24 - 27, Denver, Colorado, Preprint 13-022. Englewood, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2013 Feb; :1-6
Link
NIOSHTIC No.
20042605
Abstract
Water spray applications are one of the principal means of controlling airborne respirable dust in coal mines. Since many coals are hydrophobic and not easily wetted by water, wetting agents can be added to the spray water in an effort to improve coal wetting and assist with dust capture. In order to study wetting agent effects on coal dust capture, laboratory experiments were conducted with three wetting agents used by the coal industry on -325 mesh sized Pocahontas No. 3 coal dust. Significant differences in coal dust sinktimes were observed among the three wetting agents at water mixture concentrations of 0.05%, 0.1%, and 0.2%. The best wetting agent as identified by the coal dust sink test was only tested at the lowest 0.05% water mixture concentration and was found to have a negligible effect on spray airborne dust capture. Water spray airborne dust capture results for all three wetting agents tested at a 0.2% water mixture concentration showed that all three wetting agents exhibit similar but small improvements in dust capture efficiency as compared with water. These results indicate that the coal dust sink test may not be a good predictor for the capture of airborne dust. Additional research is needed to examine if the coal dust sink test is a better predictor of wetting agent dust suppression effects during cutting, loading, conveying, and dumping of coal products by comparison to airborne dust capture from sprays.
Keywords
Mining-industry; Underground-mining; Coal-mining; Safety-research; Air-contamination; Air-quality; Coal-dust; Respirable-dust; Spraying-equipment; Sprays; Hydrophobic-bonds; Dust-control; Dust-control-equipment; Dust-collection; Laboratory-testing; Control-methods; Airborne-dusts
Publication Date
20130224
Document Type
Conference/Symposia Proceedings
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
B20130531
NIOSH Division
OMSHR
Priority Area
Mining
Source Name
2013 SME Annual Meeting, February 24 - 27, Denver, Colorado, Preprint 13-022
State
PA; CO
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