Microwave Drying Kinetics of Chromium-Rich Electroplating Sludge
Chromium-rich electroplating sludge (CRES) is a hazardous solid waste with a high content of moisture requiring efficient drying before subsequent treatment. In this study, the microwave drying kinetics of CRES were examined. The results showed that CRES had good microwave absorptivity, contributing...
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| Format: | Article |
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MDPI AG
2022-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/13/1/87 |
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| author | Jian Zhang Zhiwei Peng Guanwen Luo Ran Tian Mingjun Rao |
| author_facet | Jian Zhang Zhiwei Peng Guanwen Luo Ran Tian Mingjun Rao |
| author_sort | Jian Zhang |
| collection | DOAJ |
| description | Chromium-rich electroplating sludge (CRES) is a hazardous solid waste with a high content of moisture requiring efficient drying before subsequent treatment. In this study, the microwave drying kinetics of CRES were examined. The results showed that CRES had good microwave absorptivity, contributing to a much shorter drying time and better drying performance compared with conventional drying. In comparison with conventional drying at 105 °C, the time of microwave drying at 600 W for total moisture removal was reduced by 98.5%. Compared to load mass and particle size, microwave power played a more important role in microwave drying. Based on the kinetics analysis, the microwave drying process of CRES could be divided into three successive stages, in which the drying rates were limited by external diffusion (before 110 s), both external diffusion and chemical reaction (between 110 s and 160 s), and chemical reaction (after 160 s), respectively. The Danish model was found to have the best fit with the microwave drying process of CRES. |
| first_indexed | 2024-03-09T11:42:36Z |
| format | Article |
| id | doaj.art-80792149894248b5af9506d92e125d03 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-09T11:42:36Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-80792149894248b5af9506d92e125d032023-11-30T23:30:33ZengMDPI AGMetals2075-47012022-12-011318710.3390/met13010087Microwave Drying Kinetics of Chromium-Rich Electroplating SludgeJian Zhang0Zhiwei Peng1Guanwen Luo2Ran Tian3Mingjun Rao4School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaSchool of Minerals Processing and Bioengineering, Central South University, Changsha 410083, ChinaChromium-rich electroplating sludge (CRES) is a hazardous solid waste with a high content of moisture requiring efficient drying before subsequent treatment. In this study, the microwave drying kinetics of CRES were examined. The results showed that CRES had good microwave absorptivity, contributing to a much shorter drying time and better drying performance compared with conventional drying. In comparison with conventional drying at 105 °C, the time of microwave drying at 600 W for total moisture removal was reduced by 98.5%. Compared to load mass and particle size, microwave power played a more important role in microwave drying. Based on the kinetics analysis, the microwave drying process of CRES could be divided into three successive stages, in which the drying rates were limited by external diffusion (before 110 s), both external diffusion and chemical reaction (between 110 s and 160 s), and chemical reaction (after 160 s), respectively. The Danish model was found to have the best fit with the microwave drying process of CRES.https://www.mdpi.com/2075-4701/13/1/87microwave dryingelectroplating sludgechromium hydroxidepermittivitykinetic model |
| spellingShingle | Jian Zhang Zhiwei Peng Guanwen Luo Ran Tian Mingjun Rao Microwave Drying Kinetics of Chromium-Rich Electroplating Sludge Metals microwave drying electroplating sludge chromium hydroxide permittivity kinetic model |
| title | Microwave Drying Kinetics of Chromium-Rich Electroplating Sludge |
| title_full | Microwave Drying Kinetics of Chromium-Rich Electroplating Sludge |
| title_fullStr | Microwave Drying Kinetics of Chromium-Rich Electroplating Sludge |
| title_full_unstemmed | Microwave Drying Kinetics of Chromium-Rich Electroplating Sludge |
| title_short | Microwave Drying Kinetics of Chromium-Rich Electroplating Sludge |
| title_sort | microwave drying kinetics of chromium rich electroplating sludge |
| topic | microwave drying electroplating sludge chromium hydroxide permittivity kinetic model |
| url | https://www.mdpi.com/2075-4701/13/1/87 |
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