Engineering & Mining Journal

JUN 2018

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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Page 102 of 115

JUNE 2018 • E&MJ 101 PROCESSING SOLUTIONS BUILD A HYDRAULIC DRILL FEED EASILY. Doofor feed system component kit helps building a hydraulic drill feed easily, economically and quickly. The kit includes a Doofor drifter, aluminum feed, a hydraulic valve and other components according to your needs. The feed can be installed on number of platforms such as excavators, mini-loaders and can be used as a part of a drill rig. IT'S A MATCH! An era of easiness starts with Doofor! DOOFOR INC. Talttakatu 8 FI-37150 Nokia, Finland Tel. +358 3 343 0747 • Train workers on silica risks and how to limit exposures – Workers should be able to identify to OSHA inspectors the dust control supervisor and the compli- ance details when asked. • In the U.S., non-compliance could re- sult in fi nes, disruption in produc- tion, and legal action by federal or state agencies or workers. If PEL readings are at or above the permissible exposure level, plants must take action with isola- tion or engineered controls. Engineering Controls and Isolation Engineering controls are retrofi tted equip- ment or newly designed systems that re- duce or eliminate exposure to RCS. An example of this, according to Martin Engineering, is its conveyor-transfer- chute design, which shapes the fl ow of cargo, controls transfer speed and mini- mizes disruption. Isolation to control dust exposure entails enclosing the material handling system through the transfer and sealing in particles to help prevent them from escaping. On a fast moving, high volume conveyor, air fl ow through the settling zone should be controlled to minimize its escape. An effective transfer zone slows the air down, allowing the material and dust time to settle. New modular struc- tures deliver the versatility to adapt to virtually any material transfer, enabling the construction of a transfer chute and settling zone of varying heights and lengths to meet specifi c needs. Special- ly confi gured dust curtains can also be installed to promote quick settling, and top-mounted dust bags release excess air while capturing particles that remain in the air stream. For heavy-duty applications with short- ducting runs that exceed the volume of a dust bag, an integrated air cleaner is a compact-dust collector located directly above the conveyor transfer point. It cap- tures agitated dust in a fi lter, then uses a reverse pulse of air to return dust to the main cargo stream. The system is not sealed if the chute skirting doesn't retain contact with the belt. Mounted on the outside of the chute with optional quick release clamps for safer access and maintenance, Martin Engineering said its ApronSeal double skirting provides a dual seal to further re- duce the escape of fi nes and dust. The patented design features a secondary sealing strip that rides the belt to deliver an extra layer of protection against dust emissions and spillage. For hydrophobic materials, the com- pany's Surfactant Dust System can apply dust-suppressing surfactant and crusting agents using strategically placed spray nozzles and a fully automated system to avoid waste. The sprayed surfactant agents reduce the surface tension of water, improving its ability to wet sur- faces and form fi ne droplets that reduce dust emissions. Another concern operators should be aware of is carryback. Without thorough discharge of bulk materials from the head pulley, fi nes can stick to the belt or get caught in cracks and divots, dropping off randomly and potentially creating fugitive dust along the entire return path. Having the proper primary and secondary clean- ers is key to reducing carryback.

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