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Characterization and solidification/stabilization of iron-ore sintering gas cleaning residue

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Abstract

With the air pollution control standards getting increasingly stricter, gas cleaning processes with higher capture efficiency of pollutants in iron-ore sintering gas cleaning were applied in China, and fine residue, an emerging hazardous waste containing high content of heavy metals as well as Polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) were produced. Disposal of the residues in secure landfill after adequate solidification/stabilization was the main solution. The feasibility of solidification/stabilization process using cement and chelating agent was investigated in this study. Leaching concentration of Lead (Pb) and Selenium (Se) exceeded the identification limit, and the content of PCDD/Fs was rather low, so the immobilization of Pb and Se was the main objective of solidification/stabilization. The result showed that leaching concentrations of Pb in the solidified products were lower than 5 mg/L when the addition of cement was 20 % or chelating agent 1 %. However, leaching concentration of Se fluctuated between 0.6 and 0.8 mg/L even the cement addition reached 45 % or chelating agent 3 %. Geochemical modelling using PHREEQC indicated that Se in the residue mainly existed as highly soluble SeO4 2−.

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Acknowledgments

This research was financially supported by the Siemens CKI project.

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Authors and Affiliations

  1. School of Environment, Tsinghua University, Beijing, 100084, China

    Minying Song, Jianguo Liu & Shiqin Xu

  2. Key Laboratory for Solid Waste Management and Environment Safety Ministry of Education of China, Beijing, 100084, China

    Minying Song, Jianguo Liu & Shiqin Xu

Authors
  1. Minying Song
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  2. Jianguo Liu
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  3. Shiqin Xu
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Correspondence to Jianguo Liu.

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Song, M., Liu, J. & Xu, S. Characterization and solidification/stabilization of iron-ore sintering gas cleaning residue. J Mater Cycles Waste Manag 17, 790–797 (2015). https://doi.org/10.1007/s10163-014-0312-4

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  • DOI: https://doi.org/10.1007/s10163-014-0312-4

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