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Effects of Alkali on Water Soluble Hexavalent Chromium in Ordinary Portland Cement

Author

Listed:
  • Fan Shi

    (School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)

  • Dehong Jiang

    (Chongzuo South Cement Co., Ltd., Chongzuo 532200, China)

  • Junrong Ji

    (Chongzuo South Cement Co., Ltd., Chongzuo 532200, China)

  • Jinsheng Yan

    (Chongzuo South Cement Co., Ltd., Chongzuo 532200, China)

  • Huxing Chen

    (School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

Due to the toxicity and mobility of chromium, the disposal of chromium-containing waste is a pressing issue. Co-processing of chromium-containing waste in a cement kiln is currently one of the most effective methods. However, the presence of water-soluble hexavalent chromium (Cr(VI)) in cement limits the use of this method. In this study, Na 2 CO 3 was used to simulate alkali in industrial raw materials to investigate the pattern of influence of alkali content on water-soluble hexavalent chromium. The mechanisms associated with the oxidation and dissolution of chromium were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma emission spectrometry (ICP-OES). The proportion of Cr(VI) in the clinker detected by XPS increased rapidly with increasing alkali content. In the cement slurry system, alkali promotes more hexavalent chromium leaching by influencing pH and other ion concentrations (Ca 2+ , SO 4 2− ). Therefore, the addition of alkali to either the raw meal or to the cement slurry system will favour an increase in the water-soluble Cr(VI) content. This study may provide theoretical guidance for the preparation and use of clinkers containing chromium.

Suggested Citation

  • Fan Shi & Dehong Jiang & Junrong Ji & Jinsheng Yan & Huxing Chen, 2022. "Effects of Alkali on Water Soluble Hexavalent Chromium in Ordinary Portland Cement," IJERPH, MDPI, vol. 19(8), pages 1-12, April.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:8:p:4811-:d:794671
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    References listed on IDEAS

    as
    1. Adriana Estokova & Lenka Palascakova & Maria Kanuchova, 2018. "Study on Cr(VI) Leaching from Cement and Cement Composites," IJERPH, MDPI, vol. 15(4), pages 1-13, April.
    2. Marina Tumolo & Valeria Ancona & Domenico De Paola & Daniela Losacco & Claudia Campanale & Carmine Massarelli & Vito Felice Uricchio, 2020. "Chromium Pollution in European Water, Sources, Health Risk, and Remediation Strategies: An Overview," IJERPH, MDPI, vol. 17(15), pages 1-25, July.
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