McLanahan Fine Material Screw Washers Designed For Optimum Efficiency

McLanahan Fine Material Screw Washers feature several design advantages to provide optimum efficiency. These include a larger pool area, longer dry deck area and greater clearance between the flights and curved plate than other sand screw offerings.

Larger Pool Area

McLanahan Fine Material Screw Washers are designed with a large pool area, which provides a much more efficient classification of the material. The larger settling area provides higher retention of product-sized fines.

“That’s really where you can start seeing some savings,” said Rick Madara, Director of Sales – North America for McLanahan Corporation. “If you’re able to settle out one or two or three tons per hour more and add that to your product pile, it adds up pretty quickly. It’s also less material that is being sent to the waste stream or settling pond, so that's a huge advantage.” [CONTINUE READING]

How To Solve Your Biggest Issues with Washing and Dewatering Sand

Whether you're new to the wet processing side of aggregate production or you've been operating sand plants for years, here are solutions to some typical issues you may experience when washing and dewatering sand.

Before we get into the issues commonly faced when washing and dewatering sand, such as sand that is discharging to the product pile too wet, product sized sand being sent to waste, sand that isn't consistently in spec and too many hours spent cleaning out settling ponds, let's first address the types of equipment used to wash and dewater sand.

Several choices are available for washing and dewatering sand that is typically minus 5mm (4 mesh) and finer. These options range from simple to more complex and can vary in capital purchase price, operational cost (including wear parts) and electric power consumption.

Other factors, such as the range of moisture in the washed product discharge when the sand goes onto the finished stockpile, should also be reviewed when setting up a sand washing plant. [CONTINUE READING]

CASE STUDY: Luck Stone Sees As Low As 7% Moisture 

Combining a McLanahan Fine Material Screw Washer and Dewatering Screen Minimizes Drying Time For Faster ROI

Luck Stone is the largest privately held, family owned and operated producer of crushed stone, sand and gravel in the United States. Their 28 sites across Virginia, Maryland, Georgia and the Carolinas provide consistent, quality aggregate materials that serve as the foundation of roads, bridges and buildings.

At each new site Luck Stone develops, they extend their core operating principles of economic development, environmentally sound practices and values based leadership. They are committed to being a good neighbor and providing a positive impact on the communities in which they operate. 

Challenge

In 2002, Luck Stone purchased their Bull Run Plant in Chantilly, Va., to serve the growing Northern Virginia market. Started in the 1950s, the quarry was a low-volume, eight to 10-conveyor operation when Luck Stone began expansion efforts to meet the market demands. They moved a road to access more reserves and grew the site to approximately 70 conveyors that transport traprock from the quarry through the crushing and wet processing plants to the stockpiles.

The expansion efforts also included upgrading their asphalt sand processing plant to increase production.

“The main driver for the expansion of the sand plant here was just the demand in the market for sand products that needed to be clean,” said Craig Wiant, assistant plant manager at the Bull Run site. “At those volumes, we can’t afford to make a pile and let it decant before we sell it, so we really needed to be able to make it on the fly, ready to ship.”

The Bull Run Plant has a lot of stock turnover, so their sand needs to be ready to ship. They wanted a solution that would put the product on the ground as dry as possible.

“It’s really critical to us to have a lot of sand-making capacity but also to have a lot of sand on the ground that’s ready to sell,” shared Wiant.

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