Experimental Study on Optimization of Phosphogypsum Suspension Decomposition Conditions under Double Catalysis
Phosphogypsum (PG) is not only a solid waste discharged from the phosphate fertilizer industry, but also a valuable resource. After high-temperature heat treatment, it can be decomposed into SO<sub>2</sub> and CaO; the former can be used to produce sulfuric acid, and the latter can be us...
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MDPI AG
2021-02-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/5/1120 |
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| author | Pinjing Xu Hui Li Yanxin Chen |
| author_facet | Pinjing Xu Hui Li Yanxin Chen |
| author_sort | Pinjing Xu |
| collection | DOAJ |
| description | Phosphogypsum (PG) is not only a solid waste discharged from the phosphate fertilizer industry, but also a valuable resource. After high-temperature heat treatment, it can be decomposed into SO<sub>2</sub> and CaO; the former can be used to produce sulfuric acid, and the latter can be used as building materials. In this paper, the catalytic thermal decomposition conditions of phosphogypsum were optimized, and the effects of the reaction temperature, reaction atmosphere, reaction time and carbon powder content on the decomposition of phosphogypsum were studied. The research shows that the synergistic effect of carbon powder and CO reducing atmosphere can effectively reduce the decomposition temperature of phosphogypsum. According to the results of the orthogonal test under simulated suspended laboratory conditions, the factors affecting the decomposition rate of phosphogypsum are temperature, time, atmosphere and carbon powder content in turn, and the factors affecting the desulfurization rate are time, temperature, atmosphere and carbon powder content in turn. Under laboratory conditions, the highest decomposition rate and desulfurization rate of phosphogypsum are 97.73% and 97.2%, and the corresponding reaction conditions are as follows: calcination temperature is 1180 °C, calcination time is 15 min, carbon powder content is 4%, and CO concentration is 6%. The results of thermal analysis of phosphogypsum at different temperature rising rates show that the higher the temperature rising rate, the higher the initial temperature of decomposition reaction and the temperature of maximum thermal decomposition rate, but the increase in the temperature rising rate will not reduce the decomposition rate of phosphogypsum. |
| first_indexed | 2024-03-09T06:16:52Z |
| format | Article |
| id | doaj.art-947b368160db4472bb90dbd03870d82f |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T06:16:52Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-947b368160db4472bb90dbd03870d82f2023-12-03T11:52:46ZengMDPI AGMaterials1996-19442021-02-01145112010.3390/ma14051120Experimental Study on Optimization of Phosphogypsum Suspension Decomposition Conditions under Double CatalysisPinjing Xu0Hui Li1Yanxin Chen2College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaCollege of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaCollege of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, ChinaPhosphogypsum (PG) is not only a solid waste discharged from the phosphate fertilizer industry, but also a valuable resource. After high-temperature heat treatment, it can be decomposed into SO<sub>2</sub> and CaO; the former can be used to produce sulfuric acid, and the latter can be used as building materials. In this paper, the catalytic thermal decomposition conditions of phosphogypsum were optimized, and the effects of the reaction temperature, reaction atmosphere, reaction time and carbon powder content on the decomposition of phosphogypsum were studied. The research shows that the synergistic effect of carbon powder and CO reducing atmosphere can effectively reduce the decomposition temperature of phosphogypsum. According to the results of the orthogonal test under simulated suspended laboratory conditions, the factors affecting the decomposition rate of phosphogypsum are temperature, time, atmosphere and carbon powder content in turn, and the factors affecting the desulfurization rate are time, temperature, atmosphere and carbon powder content in turn. Under laboratory conditions, the highest decomposition rate and desulfurization rate of phosphogypsum are 97.73% and 97.2%, and the corresponding reaction conditions are as follows: calcination temperature is 1180 °C, calcination time is 15 min, carbon powder content is 4%, and CO concentration is 6%. The results of thermal analysis of phosphogypsum at different temperature rising rates show that the higher the temperature rising rate, the higher the initial temperature of decomposition reaction and the temperature of maximum thermal decomposition rate, but the increase in the temperature rising rate will not reduce the decomposition rate of phosphogypsum.https://www.mdpi.com/1996-1944/14/5/1120phosphogypsumsuspended state decompositiondecomposition ratedesulfurization rate |
| spellingShingle | Pinjing Xu Hui Li Yanxin Chen Experimental Study on Optimization of Phosphogypsum Suspension Decomposition Conditions under Double Catalysis Materials phosphogypsum suspended state decomposition decomposition rate desulfurization rate |
| title | Experimental Study on Optimization of Phosphogypsum Suspension Decomposition Conditions under Double Catalysis |
| title_full | Experimental Study on Optimization of Phosphogypsum Suspension Decomposition Conditions under Double Catalysis |
| title_fullStr | Experimental Study on Optimization of Phosphogypsum Suspension Decomposition Conditions under Double Catalysis |
| title_full_unstemmed | Experimental Study on Optimization of Phosphogypsum Suspension Decomposition Conditions under Double Catalysis |
| title_short | Experimental Study on Optimization of Phosphogypsum Suspension Decomposition Conditions under Double Catalysis |
| title_sort | experimental study on optimization of phosphogypsum suspension decomposition conditions under double catalysis |
| topic | phosphogypsum suspended state decomposition decomposition rate desulfurization rate |
| url | https://www.mdpi.com/1996-1944/14/5/1120 |
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