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REMOVAL OF HIGH-CONCENTRATION FLUORIDE WASTEWATER BY CALCINED HYDRATED CALCIUM ALUMINATE WITH A TWO-STEP PROCESS.

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Title: REMOVAL OF HIGH-CONCENTRATION FLUORIDE WASTEWATER BY CALCINED HYDRATED CALCIUM ALUMINATE WITH A TWO-STEP PROCESS.
Authors: GUANGHONG SHENG1 shenggh@ahut.edu.cn, WEIJIAN LIANG1, SHIYU LUO1, SHISHENG WANG1, YIYUN LIU1, LEPING LIU1
Source: Environment Protection Engineering. 2025, Vol. 51 Issue 3, p83-100. 18p.
Subject Terms: *Wastewater treatment, *Adsorption (Chemistry), Calcium aluminate, Ion exchange (Chemistry), Fluorite, Electrostatic interaction, Precipitation (Chemistry)
Abstract: Hydrated calcium aluminate for fluoride removal of high-concentration fluoride-containing wastewater was prepared by thermal activation. X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), The Fourier transform infrared spectrometry (FT-IR) were used to study the adsorption process. The results showed that the main component of the modified calcium aluminate cement (CAC) was 12CaO·7Al2O3 (C12A7), and a large amount of calcium and aluminum ions were released during the fluoride removal process. The calcination of hydrated calcium aluminate improved the removal rate of fluoride. After a two-step treatment, adsorption and pH modification, the concentration of fluoride-containing solution from 300 mg/dm3 was reduced to less than 1 mg/dm3. Fluoride removal relies primarily on adsorption at low concentrations, whereas chemical precipitation dominates at high concentrations. The process involves three mechanisms: chemical precipitation, ion exchange, and electrostatic interaction. [ABSTRACT FROM AUTHOR]
Copyright of Environment Protection Engineering is the property of Oficyna Wydawnicza Politechniki Wroclawskiej and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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PubType: Academic Journal
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  Label: Title
  Group: Ti
  Data: REMOVAL OF HIGH-CONCENTRATION FLUORIDE WASTEWATER BY CALCINED HYDRATED CALCIUM ALUMINATE WITH A TWO-STEP PROCESS.
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  Data: <searchLink fieldCode="AR" term="%22GUANGHONG+SHENG%22">GUANGHONG SHENG</searchLink><relatesTo>1</relatesTo><i> shenggh@ahut.edu.cn</i><br /><searchLink fieldCode="AR" term="%22WEIJIAN+LIANG%22">WEIJIAN LIANG</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22SHIYU+LUO%22">SHIYU LUO</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22SHISHENG+WANG%22">SHISHENG WANG</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22YIYUN+LIU%22">YIYUN LIU</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22LEPING+LIU%22">LEPING LIU</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Environment+Protection+Engineering%22">Environment Protection Engineering</searchLink>. 2025, Vol. 51 Issue 3, p83-100. 18p.
– Name: Subject
  Label: Subject Terms
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  Data: *<searchLink fieldCode="DE" term="%22Wastewater+treatment%22">Wastewater treatment</searchLink><br />*<searchLink fieldCode="DE" term="%22Adsorption+%28Chemistry%29%22">Adsorption (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Calcium+aluminate%22">Calcium aluminate</searchLink><br /><searchLink fieldCode="DE" term="%22Ion+exchange+%28Chemistry%29%22">Ion exchange (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Fluorite%22">Fluorite</searchLink><br /><searchLink fieldCode="DE" term="%22Electrostatic+interaction%22">Electrostatic interaction</searchLink><br /><searchLink fieldCode="DE" term="%22Precipitation+%28Chemistry%29%22">Precipitation (Chemistry)</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Hydrated calcium aluminate for fluoride removal of high-concentration fluoride-containing wastewater was prepared by thermal activation. X-ray fluorescence spectroscopy (XRF), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), The Fourier transform infrared spectrometry (FT-IR) were used to study the adsorption process. The results showed that the main component of the modified calcium aluminate cement (CAC) was 12CaO·7Al2O3 (C12A7), and a large amount of calcium and aluminum ions were released during the fluoride removal process. The calcination of hydrated calcium aluminate improved the removal rate of fluoride. After a two-step treatment, adsorption and pH modification, the concentration of fluoride-containing solution from 300 mg/dm3 was reduced to less than 1 mg/dm3. Fluoride removal relies primarily on adsorption at low concentrations, whereas chemical precipitation dominates at high concentrations. The process involves three mechanisms: chemical precipitation, ion exchange, and electrostatic interaction. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Environment Protection Engineering is the property of Oficyna Wydawnicza Politechniki Wroclawskiej and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.37190/EPE/207494
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      – Code: eng
        Text: English
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        PageCount: 18
        StartPage: 83
    Subjects:
      – SubjectFull: Wastewater treatment
        Type: general
      – SubjectFull: Adsorption (Chemistry)
        Type: general
      – SubjectFull: Calcium aluminate
        Type: general
      – SubjectFull: Ion exchange (Chemistry)
        Type: general
      – SubjectFull: Fluorite
        Type: general
      – SubjectFull: Electrostatic interaction
        Type: general
      – SubjectFull: Precipitation (Chemistry)
        Type: general
    Titles:
      – TitleFull: REMOVAL OF HIGH-CONCENTRATION FLUORIDE WASTEWATER BY CALCINED HYDRATED CALCIUM ALUMINATE WITH A TWO-STEP PROCESS.
        Type: main
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            NameFull: GUANGHONG SHENG
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            NameFull: WEIJIAN LIANG
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            NameFull: SHIYU LUO
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            NameFull: SHISHENG WANG
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            NameFull: YIYUN LIU
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            – D: 01
              M: 07
              Text: 2025
              Type: published
              Y: 2025
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              Value: 51
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          Titles:
            – TitleFull: Environment Protection Engineering
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