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| What is granulated blast furnace slag? | |||||||||
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In the
production of iron, iron ore, iron scrap, and fluxes (limestone and/or
dolomite) are charged into a blast furnace along with coke for fuel. The coke
is combusted to produce carbon monoxide, which reduces the iron ore to a molten
iron product. This molten iron product can be cast into iron products, but is
most often used as a feedstock for steel production. Blast furnace slag is a non-metallic coproduct produced in the process. It consists primarily of silicates, aluminosilicates, and calcium-alumina-silicates. The molten slag, which absorbs much of the sulfur from the charge, comprises about 20 percent by mass of iron production. Figure below presents a general schematic, which depicts the blast furnace feedstocks and the production of blast furnace coproducts (iron and slag):
Ground Granulated
Blast Furnace Slag If the molten slag is cooled and solidified by rapid water quenching to
a glassy state, little or no crystallization occurs. This process results in
the formation of sand size (or frit-like) fragments, usually with some friable
clinkerlike material. This is called granulated blast furnace slag. The physical structure and gradation of granulated slag
depend on the chemical composition of the slag, its temperature at the time of
water quenching, and the method of production.
When granulated blast furnace slag is crushed or milled to very
fine cement-sized particles, it is called (GGBFS) ground granulated blast furnace slagwhich has
cementitious properties. This makes it a suitable partial replacement for or
additive to Portland cement.
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