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US Steel has received the required permit to move ahead with a $100 million slag recycler at its Edgar Thomson steelworks in Braddock, Pennsylvania, clearing a key regulatory milestone for the Mon Valley Works site. The permit was awarded on February 20, and the company says site prep will begin immediately, with construction expected to start this summer.
The project is designed to modernize how blast-furnace slag is handled. Instead of cooling and storing slag in open pits, the new recycler will collect and cool slag in a closed system, a change US Steel says can reduce slag-processing emissions by up to 50% annually compared with existing methods.
Beyond lowering environmental impact, the recycler supports a stronger circular-economy pathway for steel by turning a major by-product into a more consistent input for downstream markets—especially cement production, where slag is widely used as a performance-enhancing ingredient.
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