Iranian researchers have managed to produce green cement from slag for the first time.
The green cement designed by Iranian researchers in Isfahan Province, central Iran, can be used for 100 hundred years, while ordinary cements can be used at most for 25 years. The newly-produced cement is also of higher resistance comparing to the old one.
Green cement can be used in building bridges, dams, wharf and other advanced structures.
Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. However, slags can contain metal sulfides and elemental metals.
While slags are generally used to remove waste in metal smelting, they can also serve other purposes, such as assisting in the temperature control of the smelting, and minimizing any re-oxidation of the final liquid metal product before the molten metal is removed from the furnace and used to make solid metal.