Preparation and characterization of a new alkali-activated binder for superfine-tailings mine backfill

Sun, Yong; Zhao, Yingliang; Qiu, Jingping; Zhang, Shiyu; Sun, Xiaogang; Gu, Xiaowei

doi:10.1007/s11356-022-20746-5

Cited by 7 publications

(1 citation statement)

References 52 publications

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“…After being physically or chemically activated, a few typical industrial wastes, such as blast furnace slag (BFS) (Appendix A), steel slag, carbide slag (CS), fly ash, etc., have potential activity and can be used as cementing materials [20]. Sun et al [21] created a novel binder by using calcined quarry dust and NaOH at a mass ratio of 1:1 to activate slag, which significantly increased the uniaxial compressive strength (UCS) of the CPB. The rheological and mechanical properties of cemented backfill materials are influenced by factors such as the cement-tailings (C/T) ratio, mass concentration, curing temperature and time [22].…”

Section: Introductionmentioning

confidence: 99%

Additivity Effect on Properties of Cemented Ultra-Fine Tailings Backfill Containing Sodium Silicate and Calcium Chloride

Wang,

Gan,

Yang

et al. 2024

Minerals

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Tailings from gold mines gradually approach ultra-fine, making mine backfill costs higher and strength lower, which poses a serious threat to the safety of underground personnel and equipment. It is well known that suitable chemical admixtures can enhance the working properties of mortar materials. Therefore, in order to achieve the purpose of reducing the cost of ultra-fine tailings backfill and improving the working performance of ultra-fine tailings filling slurry, this paper provides a study on the effect of sodium silicate and calcium chloride on the properties of ultra-fine tailings cemented backfill materials. The results of experimental studies through rheology, strength, and microstructural tests, etc., showed that the optimal proportioning parameters of cementitious materials are 76.92% blast furnace slag, 19.24% carbide slag, and admixtures of 2.88% sodium silicate and 0.96% calcium chloride. The 3, 7, and 28-day uniaxial compressive strength of the ultra-fine tailings cemented paste backfill with the newly formulated blast furnace slag-based cementitious material increased by 124%, 142%, and 14%, respectively, compared to that of the ultra-fine tailings cemented paste backfill with the P. O42.5 cement. The setting time for ultra-fine tailings cemented backfill slurry is shortened by the addition of admixtures, and the shear stress of the slurry is correlated with the amount of hydration product generation and its formation of flocculating structure. Moreover, the cost of the newly prepared cementitious material is much lower than that of traditional cement, which lays a good foundation for the cemented filling of ultra-fine tailings.

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Section: Introductionmentioning

confidence: 99%