The experimental study of the cemented filling of high sulfur tailings

Ordinary Portland cement(OPC) is extensively used for cemented paste backfill of high sulfur tailings, while the strength of specimen is low in early period and decline in later period. The appearance of specimen is expansion and crack mainly due to sulphate attack. In this study, ground granulated blast furnace slag with a few activator were prepared as alternative binder(KL stabilizer) to OPC for cemented paste backfill of high sulfur mill tailings. In the same conditions, the strengths of specimens were 2.3and 6.0times of OPC in 7dand 60 dstage, which were higher in early period and more stable in later period. The low alkali of KL made appropriate ettringite form in initial stage, which did not damage the structure formed by calcium silicate hydrate, in the same time, the ettringite could make the specimens denser by forming skeleton and decreasing porosity. The findings have revealed that the stabilizer prepared by ground granulated blast furnace slag is superior strength and durability in cemented paste backfill of high sulfur tailings as compared with OPC.