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Manufacture and quality management of iron and steel slag products are carried out for a broad range of applications. These products have cleared environmental standards, and the majority of them are now provided to the market either as JIS (Japan Industrial Standard) equivalent products or as designated procurement items under the Green Purchasing Law. As a result, iron and steel slag products are fulfilling important functions as construction materials for roads, ports, airports, and other infrastructure across Japan, and also as an environmental material for restoring or improving marine, soil, and other environments.
As we now work toward resolving the problem of global warming, first steps have been taken to create a low-carbon society, and there are growing demands for conserving resources, saving energy, and reducing CO2 emissions. Here we will introduce some iron and steel slag products that can help to meet these demands by applying their superior characteristics as environmental materials.
The area where demand is largest for iron and steel slag products is cement. Approximately 60% of blast furnace slag is used as a raw material for this purpose. |
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Concrete aggregate manufactured using iron and steel slag as a raw material include blast furnace slag aggregate and electric arc furnace oxidizing slag aggregate. |
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Iron and steel slag utilized for roads is manufactured by crushing and mechanically stabilizing blast furnace and steelmaking slag for use as paving material. |
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Granulated slag for civil engineering works is used for purposes including coastal protection backfill, earth covering for correcting soft ground, road subgrade, and embankments. |
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Compared with the use of natural sand, the use of iron and steel slag for ground improvement can reduce the cost of ground preparation for construction and other uses. |
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Because blast furnace slag includes fertilizer components CaO, SiO2, and MgO, it is used in rice cultivation as a calcium silicate fertilizer. |
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To make rock wool used as thermal insulation, molten slag is formed into fibers, and then processed into sheets or other shapes. |
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