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Micromorphology and physicochemical properties of hydrophobic blasting dust in iron mines

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Abstract

The micromorphology and physicochemical properties of hydrophobic blasting dust (HBD) from an iron mine were comprehensively analyzed by laser particle size analysis (LPSA), scanning electron microscopy (SEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The results show that the HBD particles can be classified into three types based on their particle size (PS): larger particles (PS > 10 µm), medium particles (1 µm ≤ PS ≤ 10 µm), and nanoparticles (PS > 1 µm). The cumulative volume of respirable dust (PS > 10 µm) was 84.45%. In addition, three shapes of HBD were observed by SEM: prism, flake, and bulk. In particular, the small particles were mostly flaky, with a greater possibility of being inhaled. Furthermore, the body and surface chemical compounds of HBD were determined by XRD and XPS, respectively. Ammonium adipate (C6H16N2O4) was the only organic compound in the body of HBD, but its mass fraction was only 13.4%. However, the content of organic C on the surface of HBD was 85.35%. This study demonstrated that the small-particle size and large amount of organic matter on the surface of HBD are the main reasons for its hydrophobicity, which can provide important guidance for controlling respirable dust in iron mines.

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Acknowledgements

This work is financially supported by the National Key Research and Development Program of China (No. SQ2017YFSF060069) and the National Natural Science Foundation of China (No. 51574017).

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Authors and Affiliations

  1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Jian-guo Liu, Long-zhe Jin, Jia-ying Wang, Sheng-nan Ou, Jing-zhong Ghio & Tian-yang Wang

  2. Key Laboratory of High-Efficient Mining and Safety of Metal Mines of the Ministry of Education, University of Science and Technology Beijing, Beijing, 100083, China

    Jian-guo Liu, Long-zhe Jin & Sheng-nan Ou

  3. Mine Emergency Technology Research Center, University of Science and Technology Beijing, Beijing, 100083, China

    Jian-guo Liu, Long-zhe Jin & Sheng-nan Ou

  4. College of Safety Engineering, North China Institute of Science and Technology, Yanjiao, 101601, China

    Jing-zhong Ghio

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Liu, Jg., Jin, Lz., Wang, Jy. et al. Micromorphology and physicochemical properties of hydrophobic blasting dust in iron mines. Int J Miner Metall Mater 26, 665–672 (2019). https://doi.org/10.1007/s12613-019-1793-x

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  • DOI: https://doi.org/10.1007/s12613-019-1793-x

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