"During the Bronze Age of the Mediterranean there were a vast number of differential metallurgical processes in use. 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.
It was also ground into powder to add to glazes for use in ceramics.
Some of the earliest such uses for the by-products of slag have been found in ancient Egypt.
Historically, the re-smelting of iron ore slag was common practice as improved smelting techniques permitted greater iron yields
- in some case exceeding that which was originally achieved. During the early 20th century, iron ore slag was also ground to a powder and used to make 'Agate Glass', also known as 'Slag Glass'."
"Ground granulated slag is often used in concrete in combination with Portland cement as part of a blended cement.
Ground granulated slag reacts with water to produce cementitious properties. 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.
This previously unwanted recycled product is used in the manufacture of high performance concretes
, especially those used in the construction of bridges and coastal features, where its low permeability and greater resistance to chlorides and sulfates can help to reduce corrosive action and deterioration of the structure. The slag can also be used to create fibers which can be used as an insulation material named slag wool."
I agree! Put a use to slag