Thermal analysis kinetics of non-free water removal in nickel laterite
Differential scanning calorimetric(DSC) data during non-free water removal in nickel laterite were determined with a NETZSCH STA 449 C thermal analyzer. Experiments were carried out at four heating rates of 10,15,20 and 25℃·min-1. According to these DSC curves at different heating rates,the activati...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | zho |
| Published: |
Science Press
2015-08-01
|
| Series: | 工程科学学报 |
| Subjects: | |
| Online Access: | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2015.08.004 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1850184715972116480 |
|---|---|
| author | LIU Mei LÜ Xue-wei BAI Chen-guang DENG Qing-yu SONG Jing-jing |
| author_facet | LIU Mei LÜ Xue-wei BAI Chen-guang DENG Qing-yu SONG Jing-jing |
| author_sort | LIU Mei |
| collection | DOAJ |
| description | Differential scanning calorimetric(DSC) data during non-free water removal in nickel laterite were determined with a NETZSCH STA 449 C thermal analyzer. Experiments were carried out at four heating rates of 10,15,20 and 25℃·min-1. According to these DSC curves at different heating rates,the activation energies were calculated by five different calculation methods of conversion rate,namely the Flynn-Wall-Ozawa(FWO),Hu-Gao-Zhang(Hu GZ),Boswell,Starink,and Friedman-Reich-Levi(Friedman)methods. The pre-exponential factor(A) and the most probable mechanism function were determined by the Malek method,then the relationship between reaction degree and time under an isothermal condition was derived and the energy consumptions at different temperatures were analyzed and compared. The average activation energy of non-free water removal in nickel laterite is 181.50 k J·mol-1. The average lnA is 21.95 min-1. The most probable mechanism function fits the Zhuralev-Lesokin-Tempelman(Z-L-T)equation well. The non-free water removal is controlled by three-dimensional diffusion. The average power decreases with increasing temperature. |
| format | Article |
| id | doaj-art-16892103b5ef4206b650b1d45f4d811a |
| institution | OA Journals |
| issn | 2095-9389 |
| language | zho |
| publishDate | 2015-08-01 |
| publisher | Science Press |
| record_format | Article |
| series | 工程科学学报 |
| spelling | doaj-art-16892103b5ef4206b650b1d45f4d811a2025-08-20T02:16:59ZzhoScience Press工程科学学报2095-93892015-08-0137899499910.13374/j.issn2095-9389.2015.08.004Thermal analysis kinetics of non-free water removal in nickel lateriteLIU Mei0LÜ Xue-wei1BAI Chen-guang2DENG Qing-yu3SONG Jing-jing41. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China;2. Chongqing Academy of Metrology and Quality Inspection, Chongqing 401121, ChinaDifferential scanning calorimetric(DSC) data during non-free water removal in nickel laterite were determined with a NETZSCH STA 449 C thermal analyzer. Experiments were carried out at four heating rates of 10,15,20 and 25℃·min-1. According to these DSC curves at different heating rates,the activation energies were calculated by five different calculation methods of conversion rate,namely the Flynn-Wall-Ozawa(FWO),Hu-Gao-Zhang(Hu GZ),Boswell,Starink,and Friedman-Reich-Levi(Friedman)methods. The pre-exponential factor(A) and the most probable mechanism function were determined by the Malek method,then the relationship between reaction degree and time under an isothermal condition was derived and the energy consumptions at different temperatures were analyzed and compared. The average activation energy of non-free water removal in nickel laterite is 181.50 k J·mol-1. The average lnA is 21.95 min-1. The most probable mechanism function fits the Zhuralev-Lesokin-Tempelman(Z-L-T)equation well. The non-free water removal is controlled by three-dimensional diffusion. The average power decreases with increasing temperature.http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2015.08.004nickel lateritedewateringthermal analysiskineticsactivation energy |
| spellingShingle | LIU Mei LÜ Xue-wei BAI Chen-guang DENG Qing-yu SONG Jing-jing Thermal analysis kinetics of non-free water removal in nickel laterite 工程科学学报 nickel laterite dewatering thermal analysis kinetics activation energy |
| title | Thermal analysis kinetics of non-free water removal in nickel laterite |
| title_full | Thermal analysis kinetics of non-free water removal in nickel laterite |
| title_fullStr | Thermal analysis kinetics of non-free water removal in nickel laterite |
| title_full_unstemmed | Thermal analysis kinetics of non-free water removal in nickel laterite |
| title_short | Thermal analysis kinetics of non-free water removal in nickel laterite |
| title_sort | thermal analysis kinetics of non free water removal in nickel laterite |
| topic | nickel laterite dewatering thermal analysis kinetics activation energy |
| url | http://cje.ustb.edu.cn/article/doi/10.13374/j.issn2095-9389.2015.08.004 |
| work_keys_str_mv | AT liumei thermalanalysiskineticsofnonfreewaterremovalinnickellaterite AT luxuewei thermalanalysiskineticsofnonfreewaterremovalinnickellaterite AT baichenguang thermalanalysiskineticsofnonfreewaterremovalinnickellaterite AT dengqingyu thermalanalysiskineticsofnonfreewaterremovalinnickellaterite AT songjingjing thermalanalysiskineticsofnonfreewaterremovalinnickellaterite |