SiO2 Promoted CaO Diffusion to C Phase at 1500 and 1700 °C

Lijuan Ni; Renxing Wang; Qingya Liu; Junfei Wu; Yue Pan; Zhenyu Liu

LAPSE

Living Archive for Process Systems Engineering

LAPSE:2023.34464

Published Article

LAPSE:2023.34464

SiO2 Promoted CaO Diffusion to C Phase at 1500 and 1700 °C

Lijuan Ni, Renxing Wang, Qingya Liu, Junfei Wu, Yue Pan, Zhenyu Liu

April 27, 2023

To better understand the mass transfer behaviors in CaC2 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. SiO2 in a high-ash graphite diffuses into CaO tablet and reacts with CaO to form Ca2SiO4, which then diffuses into the graphite tablet easily and leads to CaC2 formation at 1700 °C.

Record ID

LAPSE:2023.34464

Keywords

calcium carbide, CaO, Carbon, diffusion, Kirkendall effect, SiO2

Subject

Materials

Suggested Citation

Ni L, Wang R, Liu Q, Wu J, Pan Y, Liu Z. SiO2 Promoted CaO Diffusion to C Phase at 1500 and 1700 °C. (2023). LAPSE:2023.34464

Author Affiliations

Ni L: 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,
Wang R: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Liu Q: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Wu J: State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Pan Y: 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,
Liu Z: Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Journal Name

Energies

Volume

14

Issue

3

First Page

587

Year

2021

Publication Date

2021-01-24