Thermochemical decomposition of phosphogypsum with Fe-P slag via a solid-state reaction
| Autor: | Chunhui Luo, Quande Li, Yan Sun, Qiang Zhao, Xiushan Yang, Zhongjun Zhao, Lei Sun |
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| Rok vydání: | 2022 |
| Předmět: |
Environmental Engineering
Materials science Phosphide General Chemical Engineering Inorganic chemistry Thermal decomposition Slag Phosphogypsum General Chemistry Biochemistry Decomposition chemistry.chemical_compound Iron phosphide chemistry visual_art visual_art.visual_art_medium Phosphoric acid Roasting |
| Zdroj: | Chinese Journal of Chemical Engineering. 47:113-119 |
| ISSN: | 1004-9541 |
| DOI: | 10.1016/j.cjche.2021.06.025 |
| Popis: | Phosphogypsum is a solid waste sourced from the wet-process phosphoric acid industry, which causes severe environmental damages. Its utilization was limited by its high decomposition temperature and high energy consumption. Herein, an Fe-P slag, which is a solid waste that mainly comprises iron phosphide (FeP) and diiron phosphide (Fe2P), can dramatically decrease the decomposition temperature of phosphogypsum. It was found that the Fe-P slag and CaSO4 can react as shown in the following reaction equation: 2Fe1.5P+3CaSO4+6CO2→Ca3(PO4)2+Fe3O4+3SO2+6CO. Its reaction mecha-nism was further determined using the thermodynamic method. It was found that CaS was the key intermediate for this reaction. The CaSO4 conversion for this method can reach approximately 97% under the optimized roasting conditions: the molar ratio between Fe1.5P and CaSO4 of 2:3, roasting temperature of 900 °C, a roasting time of 8 h. |
| Databáze: | OpenAIRE |
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