Slag is a partially
vitreousby-product of
smeltingore to separate the
metal fraction from the unwanted fraction. It can usually be considered to be a mixture of metal
oxides and
silicon dioxide. However, slags can contain metal
sulfides (see also
matte) and metal
atoms in the elemental form. While slags are generally used as a waste removal mechanism in metal smelting, they can also serve other purposes, such as assisting in the
temperature control of the smelting; and also 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.
Slag run-off from one of the open hearth furnaces of a steel mill, Republic Steel, Youngstown, Ohio. Slag is drawn off the furnace just before the molten steel is poured into ladles for ingotting.Ore smelting
In nature, the ores of metals such as
iron,
copper,
lead,
aluminium, and other metals are found in impure states, often
oxidized and mixed in with
silicates of other metals. During smelting, when the ore is exposed to high temperatures, these impurities are separated from the molten metal and can be removed. The collection of compounds that is removed is the slag. In many smelting processes, oxides are introduced to control the slag chemistry, assisting in the removal of impurities and protecting the furnace
refractory lining from excessive wear. In this case, the slag is termed
synthetic. A good example is steelmaking slag:
quicklime and
magnesite are introduced for refractory protection, neutralising the
alumina and
silica separated from the metal, and assist in the removal of sulfur and phosphorus from the steel.
Ferrous and
non-ferrous smelting processes produce different slags. The smelting of copper and lead in non-ferrous smelting, for instance, is designed to remove the iron and silica that often occurs with those ores, and separates them as iron-silicate-based slags. Slag from
steel mills in ferrous smelting, on the other hand, is designed to minimize iron loss and so mainly contains oxides of
calcium,
silicon,
magnesium, and aluminium. Any sandy component or quartz component of the original ore automatically carries through the smelting process as silicon dioxide.
As the slag is channeled out of the furnace, water is poured over it. This rapid cooling, often from a temperature of around
2,600 °F(1,430 °C), is the start of the granulating process. This process causes several chemical reactions to take place within the material, and gives the slag its cementitious properties.
The water carries the slag in its slurry format to a large agitation tank, from where it is pumped along a piping system into a number of gravel based filter beds. The filter beds then retain the slag granules, while the water filters away and is returned to the system.
When the filtering process is complete, the remaining slag granules, which now give the appearance of coarse beach sand, can be scooped out of the filter bed and transferred to the grinding facility where they are ground into particles that are finer than Portland cement.
Ancient slag useDuring 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.
[1]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'.
[2]Modern slag usesGround 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.
[3] The slag can also be used to create fibers which can be used as an insulation material named
slag wool.
Basic slagBasic slag is a byproduct of
steelmaking by the basic version of the
Bessemer process or the
Linz-Donawitz process. It is largely
limestone or
dolomite which has absorbed
phosphate from the iron ore being smelted. Because of the slowly-released phosphate content, as well as for its
liming effect, it is valued as
fertilizer in gardens and farms in steelmaking areas. According to the American Association of Plant Food Control Officials, basic slag must contain at least 12% total
phosphoric acid (P
2O
5) or be labeled "low phosphate".
[4]See alsoReferences- ^"The chemical composition of glass in Ancient Egypt by Mikey Brass (1999)". Retrieved 2009-06-18.
- ^www.oldandsold.com/articles02/glass-g.shtml
- ^"High Performance Cement for High Strength and Extreme Durability by Konstantin Sobolev". Archived from the original on 2009-08-03. Retrieved 2009-06-18.
- ^"Part V - Soil Acidity and Liming". Retrieved 2008-05-26.
Further reading- Dimitrova, S.V. (1996). "Metal sorption on blast-furnace slag". Water Research30 (1): 228–232. doi:10.1016/0043-1354(95)00104-S.
- Roy, D.M. (1982). "Hydration, structure, and properties of blast furnace slag cements, mortars, and concrete". ACI Journal Proceedings79 (6).
- Fredericci, C.; Zanotto, E.D., Ziemath, E.C. (2000). "Crystallization mechanism and properties of a blast furnace slag glass". Journal of Non-Crystalline Solids273 (1-3): 64–75. doi:10.1016/S0022-3093(00)00145-9.