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SiO 2 Promoted CaO Diffusion to C Phase at 1500 and 1700 °C

Author

Listed:
  • Lijuan Ni

    (Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
    State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China)

  • Renxing Wang

    (State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China)

  • Qingya Liu

    (State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China)

  • Junfei Wu

    (State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China)

  • Yue Pan

    (Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
    State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China)

  • Zhenyu Liu

    (Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China)

Abstract

To better understand the mass transfer behaviors in CaC 2 production from CaO and coke, this paper studies the diffusion behaviors of CaO and graphite, with or without ash, at 1500 and 1700 °C. CaO and graphite are pressed into tablets and heated alone or in close contact. Physical and chemical changes in these tablets are analyzed by XRD and SEM+EDX. In some experiments, thin Mo wires are placed between the closely contacted CaO and graphite tablets to identify the diffusion direction. It is found that the diffusion between CaO and low-ash graphite is very limited. SiO 2 in a high-ash graphite diffuses into CaO tablet and reacts with CaO to form Ca 2 SiO 4 , which then diffuses into the graphite tablet easily and leads to CaC 2 formation at 1700 °C.

Suggested Citation

  • Lijuan Ni & Renxing Wang & Qingya Liu & Junfei Wu & Yue Pan & Zhenyu Liu, 2021. "SiO 2 Promoted CaO Diffusion to C Phase at 1500 and 1700 °C," Energies, MDPI, vol. 14(3), pages 1-10, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:587-:d:486060
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