What is coal slag?

It’s boiler slag, which is a recycled product from coal-burning plants. When coal is “fired” at over 2,500 degrees, it melts and produces a by-product called slag. When the slag is cooled through a process called vitrification, it solidifies, forming sharp, angular granules in a variety of sizes. We reclaim this slag, dry it, crush it, screen it, and then size the remaining granules into seven different grades.

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