Download Best Practices for Dust Control in Coal Mining by Jay F. Colinet, James P. Rider, Jeffrey M. Listak, John A. PDF

By Jay F. Colinet, James P. Rider, Jeffrey M. Listak, John A. Organiscak, Anita L. Wolfe, Departmentof Health and human Services Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health

Compiled via the U.S. Dept of well-being and Human prone, CDC/NIOSH place of work of Mine protection and healthiness examine, this 2010 guide used to be built to spot on hand engineering controls that may support the decrease employee publicity to respirable coal and silica airborne dirt and dust. The controls mentioned during this guide diversity from long-utilized controls that experience built into criteria to more recent controls which are nonetheless being optimized. The rationale used to be to spot the easiest practices which are to be had to regulate respirable dirt degrees in underground and floor coal mining operations. This guide presents normal info at the keep watch over applied sciences besides wide references.

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Spray location impact on dust rollback. High-pressure sprays, installed at the rear corner of the shovel on the side opposite from the exhausting ventilation curtain, can sweep underboom dust toward the curtain. Extensive underground testing showed that the shovel sprays reduced coal dust exposures by 60% at the miner operator’s location while virtually eliminating exposures to respirable quartz dust [Schroeder et al. 1986]. The following practices have been shown to reduce dust exposures on continuous mining operations: • Dust rollback over the miner can be caused by high-pressure (>100 psi), wide-angle cone sprays [Jayaraman et al.

A German study [Breuer 1972] reported that the optimum velocity range may be increased to 700–900 fpm when the moisture content of the dust particles is 5%–8%. An MSHA study [Tomb et al. 1992] reported that as face air quantities increased, even beyond 1,200 fpm, respirable dust levels along the face decreased. As air velocities increase, it is important to ensure that sufficient wetting of the coal is provided to minimize the potential of increased entrainment with the higher air velocities. The higher velocities provide greater air quantities for better dilution of intake dust, as well as dust generated during shield support movement.

Good communication with shuttle car operators is essential because visibility can be a problem depending on where the continuous miner operator is standing. —Schematic of a blowing ventilation system. 54 • According to MSHA, when it is necessary for the operator to move from the clean air position (end of the curtain), the operator should allow the dust-laden air to clear the entry and stop the scrubber before moving. • According to MSHA, when aligning the continuous miner to square a face, the operator should position the machine and then return to the end of the curtain before coal cutting resumes.

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