利用Fe-P-N-H_(2)O体系E-pH图对硝磷酸体系合成磷酸铁的热力学分析研究  

E-pH diagram of Fe-P-N-H_(2)O system for thermodynamic analysis on synthesis of ferric phosphate by nitro-phosphoric acid system

作　　者：谷任权 吴俊虎 杨秀山[1,2] 张志业 许德华[1,2] 钟本和 GU Ren-quan;WU Jun-hu;YANG Xiu-shan;ZHANG Zhi-ye;XU De-hua;ZHONG Ben-he(School of Chemical Engineering,Sichuan University,Chengdu 610065,China;Ministry of Education Engineering Research Center for Comprehensive Utilization and Clean Processing of Phosphorus Resources,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]教育部磷资源综合利用与清洁加工工程研究中心,四川成都610065

出　　处：《现代化工》2024年第S02期290-295,302,共7页Modern Chemical Industry

摘　　要：硝磷酸法合成磷酸铁新工艺因生产流程简单、磷源成本低、设备投资小、能耗较低、绿色环保而具有很强的竞争力。利用FactSage和HSC等热力学软件中已有的热力学数据并运用E-pH图的绘制原理,得到Fe-P-N-H_(2)O体系不同浓度、298~473 K的E-pH关系图。研究表明,在水溶液中,磷酸铁具有较大的热力学稳定区域,能够很好地解释现有的液相沉淀法制备磷酸铁的实际操作条件。此外,从E-pH图中获得了共沉淀法合成磷酸铁的合适条件:温度为363 K左右、高氧化还原电位为0.5 V、适宜pH为1~3、浓度为0.01 mol/L,该工艺为硝磷酸体系共沉淀法合成磷酸铁提供了热力学理论依据。The new process for synthesizing ferric phosphate via the nitro-phosphoric acid method presents strong competitiveness due to its simple production process,low cost of phosphorus sources,small equipment investment,lower energy consumption,and environmentally friendly characteristics.E-pH relationship diagram is established for Fe-P-NH_(2)O system at various concentrations in 298-473 K through utilizing thermodynamic data available in software such as FactSage and HSC,and applying the constructing principles of E-pH diagrams.Research indicates that ferric phosphate has a large thermodynamically stable region in aqueous solution,which explains well the practical conditions of the existing liquid phase precipitation method for preparing ferric phosphate.Furthermore,suitable conditions for the coprecipitation synthesis of ferric phosphate obtained from E-pH relationship diagram are as follows:a temperature around 363 K,a high oxidation-reduction potential of 0.5 V,an optimal pH of 1 to 3,and a concentration of 0.01 mol·L^(-1).This process provides a thermodynamic theoretical basis for the synthesis of ferric phosphate by co-precipitation in the nitrophosphoric acid system.

关 键 词：Fe-P-N-H_(2)O体系 磷酸铁 热力学 

分 类 号：TM911[电气工程—电力电子与电力传动]