湿法磷酸微气浮除油技术研究  

Research on WPA micro air floatation oil removal technology

作　　者：赵彤 马航 薛河南 郎剑涛 厉华 傅英 何自博 万邦隆 ZHAO Tong;MA Hang;XUE Henan;LANG Jiantao;LI Hua;FU Ying;HE Zibo;WAN Banglong(R&D Center,Yunnan Yuntianhua Co.,Ltd.,Kunming 650228,China;Yunnan Tianan Chemical Co.,Ltd.,Kunming 650309,China)

机构地区：[1]云南云天化股份有限公司研发中心,云南昆明650228 [2]云南天安化工有限公司,云南昆明650309

出　　处：《生态产业科学与磷氟工程》2024年第8期35-38,59,共5页Eco-industry Science & Phosphorus Fluorine Engineering

摘　　要：有机溶剂萃取净化湿法磷酸过程中成品磷酸及萃余酸中均不可避免地残留有少量萃取剂及其他有机溶剂。采用压力溶气气浮技术对湿法磷酸中的有机物进行分离,考察磷酸浓度、杂质金属离子含量、萃取剂含量等因素对气浮过程的影响,对比溶气气浮与静置分离除油方案的区别。实验结果表明,磷酸浓度、杂质金属离子含量增加均引起分相时间延长。精制磷酸溶液中,w(H_(3)PO_(4))不宜大于60%;粗磷酸(MER值约0.13)体系中,w(H_(3)PO_(4))不宜大于40%。在w(H_(3)PO_(4))40%的磷酸溶液中,铁、铝、镁杂质离子总质量分数不宜高于3%。与静置分离相比,溶气气浮除油方案分相时间较短,效率较高,还可有效脱除澄清液中残留的絮状悬浮物。In the process of organic solvent extraction and purification of WPA,it is inevitable that a small amount of extractant and their organic solvent will remain in the finished phosphoric acid and residual acid.Using dissolved air flotation technology to separate organic matter in WPA,the influence of factors such as phosphoric acid concentration,impurity metal ion content and extraction content on the air flotation process is investigated,and the differences between dissolved air flotation and static separation oil removal schemes are compared.The experimental results indicate that an increase in phosphoric acid concentration and impurity metal ion content both cause an extension of phase separation time.In refined phosphoric acid solution,the concentration of phosphoric acid should not exceed 60%;In the crude phosphoric acid(MER of 0.13)system,the concentration of phosphoric acid should not exceed 40%.In a w(H_(3)PO_(4))40%solution,the total content of iron,aluminum and magnesium impurity ions should not exceed 3%.Compared with static separation,the dissolved air flotation oil removal scheme has a shorter separation time and higher efficiency,and can effectively remove residual flocculent suspended solids in the clarified liquid.

关 键 词：湿法磷酸 溶气气浮 微纳米气泡 除油 

分 类 号：TQ126.35[化学工程—无机化工]