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

Lijuan Ni, Renxing Wang, Qingya Liu, Junfei Wu, Yue Pan and Zhenyu Liu
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Lijuan Ni: Beijing Advanced Innovation Center for Soft Matter Science and 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
Zhenyu Liu: Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Energies, 2021, vol. 14, issue 3, 1-10

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.

Keywords: calcium carbide; diffusion; Kirkendall effect; CaO; carbon; SiO 2 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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