Reducing and leaching inhibition effect of ground granulated blast-furnace slag and ground electric steel furnace slag on Cr (VI)

This work mainly contains the following three aspects: (1) investigation into the reducing effect of ground granulated blast-furnace slag (GGBFS) and ground electric steel furnace slag (GESFS); (2) assessment of their ability to reduce Cr(VI) in Cr(VI)-containing aqueous solution and prevent the leaching of Cr NO from hardened fly ashes which contain high content leachable Cr(VI); and (3) relation between the amount of Cr(VI) leached from hardened fly ash and Cr(VI) concentration in the pore solution of the hardened fly ash. The results indicate that the two slags possess excellent reducibility in respect to Cr(VI). With addition of the slags whether the concentration of Cr(VI) in aqueous solution or the leaching of Cr(VI) from hardened fly ashes is reduced, and the effect is kept stable during the investigated term. GESFS has better inhibition effect on the leaching of Cr(VI) from hardened fly ash than GGBFS.