By Jay F. Colinet, Andrew B. Cecala, Gregory J. Chekan, John A. Organiscak, Anita L. Wolfe, Department of Health and Human Services Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health
Compiled through the U.S. Dept of wellbeing and fitness and Human companies, CDC/NIOSH place of work of Mine defense and future health learn, this 2010 guide was once constructed to spot to be had engineering controls which could help underground and floor metal/nonmetal mining operations in decreasing employee publicity to respirable silica dirt. The controls mentioned during this guide variety from long-used controls that have constructed into criteria, to more recent controls, that are nonetheless being optimized
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Additional info for Best Practices for Dust Control in Metal-Nonmetal Mining
Rollback. The second dust source is from rollback under the dumping mechanism. This rollback occurs either under the bed of the haul truck or the bucket of the front-end loader. For a dust control system to be effective at the primary dump location, the dust generated from both billowing and rollback must be controlled. There are three methods to control the billowing of dust from the hopper (suppress, enclose, and filter) and one method to control rollback (a tirestop water spray system). Controlling Dust Billowing From Enclosure • Suppress.
These curtains are normally installed at the head and/or tail ends of the conveyor. In many instances, a LEV is tied into the enclosure at these conveyor dump or transfer locations to capture generated dust. It has been shown that the takeoff port to the LEV system should be a least 6 feet from the dump point to minimize the pickup of oversized particles [MAC 1980]. The air velocity at this exhaust port should also be kept below 500 fpm to avoid the pickup of larger particles [Yourt 1990]. • Belt scraper.
Enclose. Enclosures are an effective dust control technique for many applications within mineral processing plants if they are correctly designed and installed, and this principle also applies to conveyors. Enclosures for conveyor and transfer points can be either full or partial type [Zimmer 2003]. One of the most common partial types of enclosures is with the use of skirting, which keeps the material on the belt, especially immediately after it exits a loading chute. An inclined skirting design, in which the skirting belt is angled at approximately 30 degrees from vertical, is more advantageous over a standard vertical design because of wear issues.