Investigation of Al2O3 and Fe2O3 transmission and transformation during the decomposition of phosphogypsum

作     者：Jie Yang Bin Zhu Liping Ma Hongpan Liu 

作者机构：Faculty of Environmental Science and EngineeringKunming University of Science and TechnologyKunming 650500China School of Environmental Science & EngineeringHuazhong University of Science & TechnologyWuhan 430074China College of Materials and Chemical EngineeringChongqing University of Arts and SciencesChongqing 402160China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2019年第27卷第5期

页      面：1125-1131页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 

基　　金：Supported by the National Natural Science Foundation of China(21666016) 

主　　题：Phosphogypsum Reductive decomposition Simulation calculations Aluminum oxide Iron oxide Ternary diagram 

摘      要：Phosphogypsum(PG) is a solid waste produced in the phosphate fertilizer industry and is environmentally harmful.The decomposition of PG to recycle calcium and sulfur is a proper way to reutilize PG. Current work aims at enriching the basic theory of coal decomposition process of PG. The emphasis was laid on the exploration of impact of main impurities on the process. On the other hand, according to Reaction Module, Equilib Module, and Phase Diagram Module of FactS age, the simulation computation was done on the systems of pure gypsum mixed with coal,with or without impurities for avoiding other impurities interference. Later, possible reactions in the process were deduced. Additionally, experiments were conducted in a TG-DTA integrated thermal gravimetric analyzer and a tube furnace. The products from the experiments were characterized and analyzed to verify the accuracy of theoretical calculations. The results showed that these impurities can change the decomposition process of PG. For example, aluminum oxide was transformed to calcium sulfoaluminate, while iron oxide was transformed to dicalcium ferrite. Furthermore, the results help to further improve the basic theory of phosphogypsum decomposition.