SiO<sub>2</sub> Promoted CaO Diffusion to C Phase at 1500 and 1700 °C
To better understand the mass transfer behaviors in CaC<sub>2</sub> 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. Phys...
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MDPI AG
2021-01-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/3/587 |
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doaj-ba8f45bd21454951898d35cb7172a8332021-01-25T00:01:18ZengMDPI AGEnergies1996-10732021-01-011458758710.3390/en14030587SiO<sub>2</sub> Promoted CaO Diffusion to C Phase at 1500 and 1700 °CLijuan Ni0Renxing Wang1Qingya Liu2Junfei Wu3Yue Pan4Zhenyu Liu5Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaState Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaState Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaState Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaBeijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaBeijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, ChinaTo better understand the mass transfer behaviors in CaC<sub>2</sub> 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<sub>2</sub> in a high-ash graphite diffuses into CaO tablet and reacts with CaO to form Ca<sub>2</sub>SiO<sub>4</sub>, which then diffuses into the graphite tablet easily and leads to CaC<sub>2</sub> formation at 1700 °C.https://www.mdpi.com/1996-1073/14/3/587calcium carbidediffusionKirkendall effectCaOCarbonSiO<sub>2</sub> |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Lijuan Ni Renxing Wang Qingya Liu Junfei Wu Yue Pan Zhenyu Liu |
| spellingShingle |
Lijuan Ni Renxing Wang Qingya Liu Junfei Wu Yue Pan Zhenyu Liu SiO<sub>2</sub> Promoted CaO Diffusion to C Phase at 1500 and 1700 °C Energies calcium carbide diffusion Kirkendall effect CaO Carbon SiO<sub>2</sub> |
| author_facet |
Lijuan Ni Renxing Wang Qingya Liu Junfei Wu Yue Pan Zhenyu Liu |
| author_sort |
Lijuan Ni |
| title |
SiO<sub>2</sub> Promoted CaO Diffusion to C Phase at 1500 and 1700 °C |
| title_short |
SiO<sub>2</sub> Promoted CaO Diffusion to C Phase at 1500 and 1700 °C |
| title_full |
SiO<sub>2</sub> Promoted CaO Diffusion to C Phase at 1500 and 1700 °C |
| title_fullStr |
SiO<sub>2</sub> Promoted CaO Diffusion to C Phase at 1500 and 1700 °C |
| title_full_unstemmed |
SiO<sub>2</sub> Promoted CaO Diffusion to C Phase at 1500 and 1700 °C |
| title_sort |
sio<sub>2</sub> promoted cao diffusion to c phase at 1500 and 1700 °c |
| publisher |
MDPI AG |
| series |
Energies |
| issn |
1996-1073 |
| publishDate |
2021-01-01 |
| description |
To better understand the mass transfer behaviors in CaC<sub>2</sub> 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<sub>2</sub> in a high-ash graphite diffuses into CaO tablet and reacts with CaO to form Ca<sub>2</sub>SiO<sub>4</sub>, which then diffuses into the graphite tablet easily and leads to CaC<sub>2</sub> formation at 1700 °C. |
| topic |
calcium carbide diffusion Kirkendall effect CaO Carbon SiO<sub>2</sub> |
| url |
https://www.mdpi.com/1996-1073/14/3/587 |
| work_keys_str_mv |
AT lijuanni siosub2subpromotedcaodiffusiontocphaseat1500and1700c AT renxingwang siosub2subpromotedcaodiffusiontocphaseat1500and1700c AT qingyaliu siosub2subpromotedcaodiffusiontocphaseat1500and1700c AT junfeiwu siosub2subpromotedcaodiffusiontocphaseat1500and1700c AT yuepan siosub2subpromotedcaodiffusiontocphaseat1500and1700c AT zhenyuliu siosub2subpromotedcaodiffusiontocphaseat1500and1700c |
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