Abstract
The main chemical component of high-silicon iron tailings (HSITs) is SiO2; HSITs also include some oxides such as Al2O3 and CaO. Mechanical activation can reduce the particle size of HSITs and enhance their pozzolanic activity such that they can be used as a type of mineral admixture for cement-based materials (CBMs). This study aims to investigate the mechanical activation (ultrafine grinding) effects of HSITs, including physical and crystallization structure effects. The particle distribution, specific surface area, density, and solubility of HSITs were tested using laser particle size analysis and other routine physical testing methods. Their crystal structures were analyzed using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and differential scanning calorimetry-thermogravimetry (DSC-TG). Grinding reduced the particle size of HSIT particles and increased their specific surface area, wherein the minimum D50 was 5.75 μm, the maximum specific surface area was 7608 m2/kg, and the corresponding grinding time was 3.5 h. With an increase in grinding time, the solubility showed an increasing trend; however, the density showed a decreasing trend. The change was fast before 3.5 h or 4 h and then slowed down, but the final solubility was still higher than its initial level, while the final density was still lower than its initial level. Grinding reduced the degree of crystallization of the minerals in HSITs and increased the microscopic strain and disorder of its crystal structure. These changes were significant for a grinding time of 0–3.5 h, after which the changes tended to be slow. The symmetry and integrity of the SiO2 structure decreased with grinding. The activity index of the HSIT powder was higher than 0.6. Ultrafine grinding improves the particle size distribution of HSITs and reduces the crystallinity of their main minerals, which in turn increases their chemical reactivity. It can be said that ultra-finely ground HSIT powder is pozzolanic and can be used as a mineral admixture for CBMs, and its grinding limit can be inferred to be 3.5 h.
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Data Availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- HSITs:
-
high-silicon iron tailings
- CBMs:
-
cement-based materials
- DPI:
-
diffraction peak intensity
- FWHM:
-
full width at half maximum
- XRD:
-
X-ray diffraction
- FTIR:
-
Fourier transform infrared spectroscopy
- DSC-TG:
-
differential scanning calorimetry-thermogravimetry
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This work was supported by the National Natural Science Foundation of China (Grant No. 51874076)
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Conceptualization, Yun-hong Cheng; methodology, Yun-hong Cheng and Bai-qiang Tong; formal analysis and investigation, Yun-hong Cheng, Bai-qiang Tong, Xiao-hui Sun, and Jing-yu Zhang; writing — original draft preparation, Yun-hong Cheng; writing — review and editing, Yun-hong Cheng; funding acquisition, Yun-hong Cheng; resources, Bai-qiang Tong, Xiao-hui Sun, Jing-yu Zhang; supervision, Yun-hong Cheng.
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Cheng, Yh., Tong, Bq., Sun, Xh. et al. On the grinding effects of high-silicon iron tailings. Environ Sci Pollut Res 29, 73326–73340 (2022). https://doi.org/10.1007/s11356-022-20964-x
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DOI: https://doi.org/10.1007/s11356-022-20964-x