Heyl & Patterson Blog

Coal Ash Drying and Beneficial Reuse

Posted by H&P Blog on Wed, Apr 29, 2015 @ 09:34 AM

According to the U.S. Environmental Protection Agency (EPA), the two largest beneficial uses of encapsulated coal combustion residuals (CCR) -- commonly known as coal ash -- are as substitutes for portland cement in concrete, and for gypsum in wallboard.  The EPA concluded that these uses of coal ash are most appropriate because they are comparable to the original materials, or below the agency’s health and environmental benchmarks.  Concrete and wallboard account for nearly half of the total amount of coal ash that is reused.  The extraction of raw minerals consumes energy, impacts the environment, limits the availability of natural resources and has a detrimental effect on water resources. The recycling and reuse of waste materials helps decrease these unfortunate impacts.

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Tags: industrial dryers, rotary dryers, fluid bed dryers, calciners, coal ash, tailing ponds

Top 10 Heyl & Patterson Blog Posts of 2014: The Year in Review

Posted by H&P Blog on Tue, Dec 30, 2014 @ 08:50 AM

The Heyl & Patterson Blog, or simply the H&P Blog as it is known on social media, has been posting articles regularly since 2010.  At Heyl & Patterson, our goal is to educate and inform you about the latest developments in your industries.  This forum has covered topics as varied as the industries we serve, from explaining the inner workings of conduction dryers to examining how a railway across Colombia could compete with the Panama Canal.  As the author of this blog, I've never broken the fourth wall, but I'd like to thank all of our subscribers for following us, and if you haven't yet read the Heyl & Patterson Blog, this is a good time to start.

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Tags: Heyl & Patterson, barge unloaders, industrial dryers, torrefaction, process equipment, H&P Process Spotlight, calciners, sand, continuous barge unloader (cbu), oil sands, coal ash, tailing ponds, activated carbon, upgrades, dust collection, algae, biomass

Drying Waste Materials From Tailing Ponds

Posted by H&P Blog on Wed, Jul 09, 2014 @ 10:08 AM

A tailings pond is a temporary storage area for the leftover by-product materials from oil sands, shale gas and coal ash operations, and is often a discontinued mine pit that has been re-engineered with a dam and dyke system.  The contents of the pond is a slurry, with large volumes of water, sand, clay, residual hydrocarbons, heavy metals, naphtha diluents and naphthenic acids, which are known as tailings.  The various materials settle to different depths, but they can all be dredged and dried to reduce their volume and eliminate moisture.

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Tags: rotary dryers, dewatering, oil sands, coal ash, tailing ponds