Sometimes when processing a very dilute sand slurry, such as at a stone rinsing vibrating screen station, and needing to retain +200 mesh or 75 micron solids, a sand screw size selection may need to be larger than what appears to be required when the solids feed rate isn’t that much. If you look at a manufacturer’s tons per hour data, a machine’s water volume capacity may not meet your needs for fine sand solids retention based on the water volume capacity chart.
McLanahan Corporation offers a wider range of Fine Material Sand Screws than other manufacturers. High Water Volume Screw Washers are available sizes that allow the mixing and matching of a screw shaft size to handle a reduced capacity of sand solids with a washer box tub to handle a larger than normal water volume. This provides a lower cost option as compared to a larger standard sand screw. If the sand capacity is 50 tph with 1,000 gallons per minute of water, a 36” diameter screw shaft can be provided in a 54 “ washer box tub.
High Water Volume Screw Washers have been in operation since 2002, providing operators a proper alternative with increased product sized sand fines retention, as opposed to a standard machine selected incorrectly for just the tons per hour sand solids capacity.