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During smelting, when the ore is exposed to high temperatures, these impurities are separated from the molten metal and can be removed.

Ferrous and non-ferrous smelting processes produce different slags.

A slag by-product of such workings was a colorful, glassy, vitreous material found on the surfaces of slag from ancient copper foundries.

It was primarily blue or green and was formerly chipped away and melted down to make glassware products and jewelry.

Concrete containing ground granulated slag develops strength over a longer period, leading to reduced permeability and better durability.

Since the unit volume of Portland cement is reduced, this concrete is less vulnerable to alkali-silica and sulfate attack.

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