武汉工程大学学报2025，Vol.47Issue(5)：502-507,515,7.DOI:10.19843/j.cnki.CN42-1779/TQ.202503005
膜技术在萃余酸梯级利用中的应用研究
Application of membrane technology in the cascade utilization of raffinate acid
摘要
Abstract
To address the resource utilization challenges of raffinate acid in the phosphate extraction industry—caused by its high solid content,residual organic extractants,and enrichment of heavy metal ions—this study designed a three-stage integrated purification process including pretreatment,ultrafiltration(UF),and nanofiltration(NF).Specifically,this process used air flotationand plate-and-frame filter press in the pretreatment stage,40 nm silicon carbide(SiC)ceramic membrane UF and acid-resistant membrane NF units to remove impurities and achieve cascade separation of components in the raffinate acid.The results demonstrated that the pretreatment stage effectively separated particles larger than 100 mm via sedimentation while simultaneously removing 44.37%of the organic solvents.The SiC ultrafiltration membrane unit achieved a phosphorus recovery rate exceeding 95%.The retentate showed solid content below the detection limit and no detectable tributyl phosphate(TBP)residues,with a stable average flux of 500 L/(h·m2).The nanofiltration unit further enhanced cumulative total phosphorus recovery rate to over 53.5%,achieving an average flux of 6.4 L/(h·m2)and reducing the critical mass ratio of sesquioxides to P2O5 to 0.02.The combined pretreatment and membrane separation process enables high-value conversion and comprehensive utilization of valuable components in raffinate acid.The resulting products can be used to manufacture high-value products such as diammonium phosphate.关键词
萃余酸/湿法磷酸/纳滤/超滤/高值化利用Key words
raffinate acid/wet-process phosphoric acid/nanofiltration/ultrafiltration/value-added utilization分类
化学化工引用本文复制引用
张贺贺,郎剑涛,马航,刘文彪,李亮,季家友..膜技术在萃余酸梯级利用中的应用研究[J].武汉工程大学学报,2025,47(5):502-507,515,7.基金项目
国家自然科学基金区域创新发展联合基金重点项目(U24A20554) （U24A20554）
湖北省重点研发专项(2023BAB100) （2023BAB100）
贵州省重大专项(黔科合重大专项字[2024]012) （黔科合重大专项字[2024]012）
