Page 9 - Hub-4 Magazine Issue 58
P. 9

Cover story
This Portable Aggredry Wash Plant is equipped with a Guardian® Horizontal Screen to generate multiple products.
“The unique factor of the Aggredry is that it does not allow the material particles that go through the dewatering screen to be lost. Instead we use a simple device to eject the water and through particles back into the sand screw,” says Bennington.
Field-proven performance
In recent years, the Aggredry dewatering washer has become a popular choice in the U.S. for companies such as Milwaukee, Wisc.-based Wissota Sand & Gravel, an operation that’s realizing all the advantages of effective sand washing technology at a fraction of the typical costs per ton in its specific application.
When using their prior sand screws, the material was coming out at about 25-percent moisture content, causing material to stick to conveyor components, or slough off into the wheels of the radial stacker. Also, they had calculated a water loss of about 400-gallons per minute, with the water going to a part of the operation where it could not be recovered. Rather than locating some surface water that could be recovered; or pumping water from a deep well, Wissota decided to install the new Aggredry system.
The Aggredry system at Wissota features twin fine material washers combined with twin high frequency dewatering screens. Sand is coming off the two screens at 8-percent moisture content, requires no drying time, and is immediately saleable. The dry material is easy to convey even when the stacker is elevated to its full height, allowing the operation to manage its stockpiling
far more effectively. Most importantly, they are realizing a water savings of about 350- gallons per minute. Additionally, if they hit
a dirty spot in the pit, the Aggredry
allows them to process the dirtier material and still manage
the fines on the wash end of the plant, giving them more throughput without having to be so particular about the material coming from the primary circuit.
According to the Wissota management team, their attraction to the Aggredry stemmed from “its unique combination of two ‘tried-and-true’ technologies – sand screws and high frequency dewatering screens.”
Bennington explains that a traditional sand screw is a perfectly adequate technology on its own, but it does require additional real estate for drying time, as well as a plan for handling the water runoff. “The option of running a straight dewatering screen is also adequate,” he says, “but you will lose up to 4-percent of your finished material. In the end, either a screw or a dewatering screen can operate as a stand- alone, with some drawbacks; however, the innovative blend of both technologies positions the Aggredry as the standard washing solution for sand and gravel,” says Bennington.
Rock Face to Load Out® sustainability
Superior Industries designs, manufactures, and supports sustainable material processing solutions from rock face to load out - from feeding, crushing and screening, to washing, conveying, stockpiling, and loading. “Versus those manufacturers who rely upon outsourcing various plant components, Superior Industries manufactures equipment for every function of material processing, and this ensures the highest level of quality control,” says John Garrison, vice president of sales for Superior Industries.
“While some manufacturers merely launch a product, Superior is dedicated to supporting that product from within the local market,” says Garrison. “We’ve built successful distributor relationships worldwide, and we are developing additional dealer partners in Europe, the Middle East and Africa,” he says.
“Importantly, as a single-source provider, Superior is better able to package and customize solutions to meet each specific application, while helping producers gain greater sustainability.”
Patented fines recover technology returns a portion of lost fines to the screw saving them from a waste pond or pile.
www.hub-4.com September/October 2019 - Issue 58
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