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Samples of "ground granulated blast furnace slag" (left) and "granulated blast furnace slag" (right) Ground granulated blast-furnace slag (GGBS or GGBFS) is obtained by quenching molten iron slag (a by-product of iron and steel-making) from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder.
Slag can also be used to create fibers used as an insulation material called slag wool. Slag is also used as aggregate in asphalt concrete for paving roads. A 2022 study in Finland found that road surfaces containing ferrochrome slag release a highly abrasive dust that has caused car parts to wear at significantly greater than normal rates. [14]
Rotating abrasive wheel on a bench grinder. Pedal-powered grinding machine, Russia, 1902. A grinding machine, often shortened to grinder, is any of various power tools or machine tools used for grinding. It is a type of material removal using an abrasive wheel as the cutting tool. [1]
The first sale outside the MIM Holdings group also occurred in 1995, with the sale of three smaller "M1000" IsaMills to Kemira for grinding calcium sulfate at one of its Finnish operations. [ 6 ] A fifth M3000 IsaMill was installed in the McArthur River concentrator in 1998 and six more in the Mount Isa lead–zinc concentrator in 1999.
Once the state grid supplied power, this generator continued to supply power to all the continuous processes on the site, such as the retorts, the blast furnace and the townsite. The supply grid powered the sawmills and the ore crushing equipment. Two diesel generators were available on stand-by.
The granulated slag (<3 mm size fraction) has both insulating and drainage properties which are usable to avoid ground frost in winter which in turn prevents pavement cracks. The usage of this slag reduces the usage of primary materials as well as reduces the construction depth which in turn reduces energy demand in building.