Dry Granulation and Solidification of Molten Blast Furnace Slag

In order to develop a process of both recovering the heat retained in molten blast furnace slag and producing aggregate for concrete making, characteristics of molten slag in granulation and solidification were investigated. The newly developed method of dry granulation, consisted in making the molten slag collide with a hard surface that was insulated with a thin coat of oil or water, was found to have several advantages, such as (1) low power consumption for granulation, (2) low heat loss during granulation, and (3) relatively short range of dispersion of the slag granules. In the solidification study, slag granules of 5 mm diameter were sub-