湿法磷酸深度净化工艺的研究  

Advanced Purification Process of Wet-Process Phosphoric Acid

作　　者：季家友[1] 张贺贺 马航 刘文彪 王奋钰 李少平 JI Jiayou;ZHANG Hehe;MA Hang;LIU Wenbiao;WANG Fenyu;LI Shaoping(School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,China;Research and Development Center of Yunnan Yuntianhua Co.,Ltd,Kunming 650228,China;Hubei Three Gorges Laboratory,Yichang 443007,China)

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430205 [2]云南云天化股份有限公司研发中心,云南昆明650228 [3]湖北三峡实验室,湖北宜昌443007

出　　处：《武汉工程大学学报》2022年第5期504-508,共5页Journal of Wuhan Institute of Technology

基　　金：湖北三峡实验室开放基金(SK212002);湖北省重点研发项目(2020BCA075)。

摘　　要：针对湿法磷酸原料杂质多、产品附加值不高的问题,研究以湿法磷酸为原料,采用预处理工艺结合二级膜过滤的集成深度净化工艺,成功制得了食品级磷酸。结果表明:预处理工艺中,脱砷率可达89.7%,脱硫率可达98%,脱氟率可达95.2%;二次脱砷工艺中,脱砷率可达93.3%;两级膜工艺中,碳化硅超滤膜平均通量达595 L/(h·m^(2));一次纳滤平均通量为6.4 L/(h·m^(2));二次纳滤平均通量为12.9 L/(h·m^(2));二次纳滤后的湿法磷酸中w(Fe)=2.26 mg/kg、w(Pb)=0.29 mg/kg、w(Cd)=0.15 mg/kg;经浓缩处理后达到食品级磷酸标准。The raw materials of wet-process phosphoric acid contain many impurities with little added value.The food-grade phosphoric acid was successfully prepared from wet-process phosphoric acid by the integrated advanced purification process of pretreatment and secondary membrane filtration.The results show that the arsenic removal rate is 89.7%,the desulfurization rate is 98%,and the defluorination rate is 95.2%,while the arsenic removal rate can reach 93.3%in the secondary arsenic removal process.In the process of secondary membrane filtration,the average flux of silicon carbide ultrafiltration membrane is 595 L/(h·m^(2));the average fluxes of primary and secondary nanofiltration are 6.4 L/(h·m^(2))and 12.9 L/(h·m^(2)),respectively.The ions content of iron,lead and cadmium in wet process phosphoric acid after secondary nanofiltration is reduced to 2.26 mg/kg,0.29 mg/kg and 0.15 mg/kg,respectively.After concentration treatment,the phosphoric acid reaches the standard of food-grade.

关 键 词：湿法磷酸 预处理工艺 两级膜过滤 食品级磷酸 

分 类 号：TQ126.3[化学工程—无机化工]