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Slag

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. In some smelting processes, such as ilmenite smelting to produce titanium dioxide, the slag is the valuable product instead of the metal.

Ground granulated slag is often used in concrete in combination with Portland cement as part of a blended cement. Ground granulated slag reacts with a calcium byproduct created during the reaction of Portland cement 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 used as an insulation material called slag wool.

SPECIFICATION OF GRANULATED BLAST FURNACE SLAG

Sl. No Parameters/Composition Percentage
01. Moisture 12% Max
02. Calcium Oxide (CaO) 30-45%
03. Silicon di Oxide (SiO2) 30-35%
04. Aluminum Oxide (Al2O3) 12-20%
05. Ferric Oxide (Fe2O3) 1% Max
06. Magnesium Oxide (MgO) 5-9%
07. Sulphuric Anhydride (SO3) 1% Max
08. Insoluble Residue (IR) 0.50% Max
09. Loss on Ignition 1% Max
10. Glass Content 95% Min