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Thermal treatment and utilization of Al-rich waste in high calcium fly ash geopolymeric materials

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Abstract

The Al-rich waste with aluminium and hydrocarbon as the major contaminant is generated at the wastewater treatment unit of a polymer processing plant. In this research, the heat treatment of this Al-rich waste and its use to adjust the silica/alumina ratio of the high calcium fly ash geopolymer were studied. To recycle the raw Al-rich waste, the waste was dried at 110°C and calcined at 400 to 1000°C. Mineralogical analyses were conducted using X-ray diffraction (XRD) to study the phase change. The increase in calcination temperature to 600, 800, and 1000°C resulted in the phase transformation. The more active alumina phase of active γ-Al2O3 was obtained with the increase in calcination temperature. The calcined Al-rich waste was then used as an additive to the fly ash geopolymer by mixing with high calcium fly ash, water glass, 10 M sodium hydroxide (NaOH), and sand. Test results indicated that the calcined Al-rich waste could be used as an aluminium source to adjust the silica/alumina ratio and the strength of geopolymeric materials. The fly ash geopolymer mortar with 2.5wt% of the Al-rich waste calcined at 1000°C possessed the 7-d compressive strength of 34.2 MPa.

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Authors and Affiliations

  1. Sustainable Infrastructure Research and Development Center, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen, 40002, Thailand

    Prinya Chindaprasirt

  2. Department of Chemistry, Faculty of Sciences, Burapha University, Chonburi, 20131, Thailand

    Ubolluk Rattanasak & Pimdao Vongvoradit

  3. Applied Science Department, Faculty of Sciences, Chandrakasem Rajabhat University, Bangkok, 10900, Thailand

    Supichart Jenjirapanya

Authors
  1. Prinya Chindaprasirt
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  2. Ubolluk Rattanasak
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  3. Pimdao Vongvoradit
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  4. Supichart Jenjirapanya
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Correspondence to Ubolluk Rattanasak.

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Chindaprasirt, P., Rattanasak, U., Vongvoradit, P. et al. Thermal treatment and utilization of Al-rich waste in high calcium fly ash geopolymeric materials. Int J Miner Metall Mater 19, 872–878 (2012). https://doi.org/10.1007/s12613-012-0641-z

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  • DOI: https://doi.org/10.1007/s12613-012-0641-z

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