• Cadmium Detoxification by Sintering with Ceramic Matrices

    Diyun Chen, Kaimin Shih, Minhua Su
    Hung-ping Tsao, Lawrence K Wang (see profile)
    Digital Books, Environmental Humanities, Sustainability, World-Ecology Research Network
    Science--Study and teaching, Technology--Study and teaching
    Item Type:
    Book chapter
    STEM, Science and technology studies (STS)
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    Su, M, Shih, K and Chen, D (2020). Cadmium detoxification by sintering with ceramic matrices. In: "Evolutionary Progress in Science, Technology, Engineering, Arts, and Mathematics (STEAM)", Wang, Lawrence K. and Tsao, Hung-ping (editors). Volume 2, Number 3, March 2020; 38 pages. Lenox Institute Press, Newtonville, NY, 12128-0405, USA. No. STEAM-VOL2-NUM3-MAR2020; ISBN 978-0-9890870-3-2. --------------- ABSTRACT: The use of various low-cost and attainable ceramic matrices (amorphous SiO2, γ-Al2O3, α-Fe2O3 and Fe3O4) to interact with Cd-containing waste is a promising method of Cd stabilization. Heating mixtures of cadmium oxide (CdO) and ceramic matrices at various molar ratios and temperatures (600-1000 degree C) for 3 h could achieve the goal of Cd incorporation. Phase transformation was assessed using X-ray diffraction (XRD), and the efficiency of Cd incorporation was quantified through Rietveld analysis of the obtained XRD patterns. The XRD results show that Cd can be crystallochemically incorporated into CdSiO3, Cd2SiO4, Cd3SiO5, CdAl4O7 and CdFe2O4 phases. The treatment temperature greatly affected the Cd incorporation reactions. The Cd incorporation efficiency was quantified and expressed as a transformation ratio according to the weight fractions of crystalline phases in the sintering products. To evaluate the metal stabilization effect of the Cd detoxification process, a series of constant-pH leaching tests was conducted. A remarkable reduction in Cd leachability was achieved by forming different Cd-hosting crystalline products, particularly spinel phase CdFe2O4. Overall, the efforts to stabilize Cd by sintering with ceramic matrices suggest a promising strategy for the detoxification of Cd in wastes.
    Keywords: Cadmium pollution control; Ceramic matrices; Detoxification; Leaching tests; Sintering; Thermal stabilization; XRD analysis, STEM, STEAM
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