Pit & Quarry, May 2016
AIR ClAssIFYInG Whirlwind remake An air classifier installed in 1961 has been refurbished and is still making sand and aglime at Rockydale Quarries in Virginia ockydale Quarries Corp has operated in the Roanoke Valley since 1932 and continues to provide a wide variety of aggregates agricultural lime and bio mix soils to serve the needs by Carl Emigh of many industries in Virginia and the Carolinas A 12 ft air classifier installed at Rockydales Roanoke Va operation in 1961 is still making agricultural lime and minus 1 4 in sand for asphalt production The machine was refurbished by Rockydale with parts supplied by the manufacturer in 2015 after more than 53 years of continuous operation The refurbishing cost was 40 percent of the cost of a completely new machine We worked closely with the manufacturer Sturtevant throughout the refurbishing process says Rockydale Vice President of Operations Gary Hubbard Refurbishment was an option because the basic design of the unit hasnt changed much The air classifier is a Whirlwind model and essential parts such as the fans distributors and cones were readily replaceable which eased the refurbishing process Most of the original rotating parts did not need to be replaced including the heavy duty drive mechanism Rockydale also utilizes a 16 ft Sturtevant Whirlwind air classifier to produce aglime and minus 5 mesh sand for concrete production That machine was installed in 1985 and replaced in 2007 by another 16 ft Whirlwind when it was damaged by fire OPeRATIOn deTAIls Our crushing and screening system utilizes a 42 48 jaw crusher four cone crushers and seven screens to produce riprap gabion 3 in x 1 in 57s 8s and 10s Hubbard says We use the air classifiers exclusively to produce agricultural lime and the concrete and asphalt products One circuit produces 70 tph the other produces 50 tph The classifiers have no The Sturtevant 16 ft Whirlwind air classifier produces aglime and concrete sand 24 PIT QUARRY May 2016 pitandquarry com Photos courtesy of rockydale quarries R
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