ANALYSIS OF SLOWLY COOLED BLAST FURNACE SLAG WITH DIFFERENT ORIGIN, TREATMENT METHOD, AND AGING PERIOD

摘要

The chemical compositions of slowly cooled blast furnace slag are similar to those of granulated blast furnace slag. The fluctuation of main chemical compositions such as SiO_2, CaO, Al_2O_3 and MgO of slowly cooled blast furnace slag is small. As aging period became longer, SO_3 quantity in the sulfur component tended to increase and S quantity tended to decrease. The cause of this phenomenon was considered due to that S was oxidized during aging. The content of water-soluble sulfurs in slowly cooled blast furnace slag was much larger than that in granulated blast furnace slag. Among them, the ratio of thiosulfate ion to sulfate ion was affected by aging period. The main composition of water-soluble cations in slowly cooled blast furnace slag was Ca~(2+). The elution quantity of Na~+ and K~+ from this slag was much smaller than that from portalnd cement.