Experimental study on the utilization of steel slag for cemented ultra-fine tailings backfill

To improve the properties of cemented ultra-fine tailings backfill (CUTB), the authors intend to outline the framework of the effect of steel slag (SS) on the properties of CUTB. Therefore, flowability, unconfined compressive strength (UCS), hydration products, and pore structure were used to invest...

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Bibliographic Details
Published in:Powder technology 2020-09, Vol.375 (C), p.284-291
Main Authors: Yingliang, Zhao, Zhengyu, Ma, Jingping, Qiu, Xiaogang, Sun, Xiaowei, Gu
Format: Article
Language:English
Subjects:
Backfill
Cemented paste backfill
Cementing
Compressive strength
Diameters
Environmental performance
Film thickness
Hydration
Leaching
Mercury
Mine tailings
Pore structure
Porosity
Properties (attributes)
Slag
Steel slag
Thermodynamic models
Thermogravimetry
Toxicity
Ultra-fine tailings
Unconfined compressive strength
Water film
X-ray diffraction
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Summary:To improve the properties of cemented ultra-fine tailings backfill (CUTB), the authors intend to outline the framework of the effect of steel slag (SS) on the properties of CUTB. Therefore, flowability, unconfined compressive strength (UCS), hydration products, and pore structure were used to investigate the properties of CUTB samples. The results showed that the incorporation of SS increased the flow spread by increasing the water film thickness (WFT). Unconfined compressive strength (UCS) was observed to be enhanced when the content of SS did not exceed 20 wt%. Hydration phase evolution tested by X-ray diffraction, thermogravimetry, and thermodynamic modeling indicated the additional formation of hydrotalcite-like phases (Ht). This contributed to a denser microstructure. Besides, lower total porosity and critical pore diameter (dcr) obtained by mercury intrusion porosimeter tests were observed in samples with SS addition, which could favor the strength development. On the other hand, toxicity characteristic leaching procedure (TCLP) results indicated that the CUTB exhibited good environmental performance. [Display omitted] •Adding SS increased the flowability of UCTB slurry through enhancing the WFT value.•The addition of SS increased the UCS of UCTB samples after curing for 28 days.•Incorporating SS reduced the C-S-H formation but increased the Ht generation.•Refined pore structure due to the addition of SS was observed.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2020.07.052