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Effect of additives on stabilization and inhibition of mercury re-emission in simulated desulphurization slurry

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Abstract

The introduction of additives into desulfurization slurry may inhibit the mercury re-emission from slurry and improve the stabilization of mercury in slurry. In this paper, the effect of common additives, such as sodium sulfide (Na2S), 2,4,6-trimercaptotriazine trisodium (TMT-18), sodium dithiocarbamate (DTCR-2) and Fenton reagent, on mercury distribution in gas–liquid–solid phase was investigated under typical operating conditions. Meanwhile, the effect of different additive dosages on the inhibition performance of mercury re-emission was studied. Furthermore, the inhibition mechanisms of different additives were also discussed. The experimental results showed that Na2S, TMT-18, DTCR-2 and Fenton reagent could inhibit the mercury re-emission from desulfurization slurry and some mercury that might reemit into the gas phase before would be restrained in the solid phase. For additives such as Na2S, TMT-18 and DTCR-2, with the increase in additive dosages, the inhibition performances of mercury re-emission were improved, but the enhancing effects tended to level off. More mercury could be restrained in the solid phase by forming HgS, Hg-TMT and Hg-DTCR. However, for additives such as Fenton reagent, the inhibition performance of mercury re-emission was first increased and then decreased with the proportion of Fe2+ and H2O2 in Fenton reagent increasing. There existed an optimal proportion. The oxygenated free radical generated by Fenton reagent with Fe2+ as catalysis was the main reason for the inhibition of mercury re-emission, and more mercury would be oxidized and then restrained in solid phase due to the formation of HgSO4 and Fe(OH)3.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 51676101) and the Natural Science Foundation of Jiangsu (No. BK20161558).

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Authors and Affiliations

  1. School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing, 210042, China

    H. Wu & H. Yang

  2. Engineering Laboratory of Energy System Process Conversion and Emission Reduction Technology of Jiangsu Province, Nanjing, 210042, China

    J. Sun

  3. Jiangsu Provincial Key Laboratory of Materials Cycling and Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing, 210042, China

    C. Zhou

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  1. H. Wu
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  2. J. Sun
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  3. C. Zhou
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  4. H. Yang
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Correspondence to H. Yang.

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Editorial responsibility: Senthil Kumar Ponnusamy.

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Wu, H., Sun, J., Zhou, C. et al. Effect of additives on stabilization and inhibition of mercury re-emission in simulated desulphurization slurry. Int. J. Environ. Sci. Technol. 16, 7705–7714 (2019). https://doi.org/10.1007/s13762-019-02301-x

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  • DOI: https://doi.org/10.1007/s13762-019-02301-x

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