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industrial slag
Waste formed as an upper, molten layer in the smelting of ores and refining of metals, notably iron and steel. It consists of impurities, oxides, and ash, with a limestone flux, and serves to remove unwanted substances and to protect the metal from oxidation. Solidified slag is used as aggregate, for road making, and as a phosphate fertilizer.

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   • blast furnace
   • open-hearth process

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