Updated 3/25/20: All U.S. Minerals facilities are operational during COVID-19 shelter-in-place directives. Read more. 

What is coal slag?

Coal slag, also known as boiler slag, is a recycled product produced by coal-burning plants. When coal is “fired” at over 2,500 degrees, it melts and produces a by-product called slag. The slag is cooled through a process called vitrification which causes it to solidify and form sharp, angular granules in a variety of sizes. This slag is then reclaimed, dried, crushed, and the remaining granules are sorted into seven different grades of blasting abrasives.


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