Removal of Iron(III) and Aluminum Ions from Phosphoric Acid–Nitric Acid Solutions by S957 Chelation Resin: Kinetics, Dynamic Adsorption, and Elution

• Published in: Industrial & engineering chemistry research 2019-11, Vol.58 (47), p.21641-21648
• Main Authors: Lv, Rui, Hu, Yingyuan, Jia, Zehui, Li, Rui, Zhang, Xiaochao, Liu, Jianxin, Fan, Caimei, Feng, Junqiang, Zhang, Lingyun, Wang, Zhihua
• Format: Article
• Language: English
• ISSN: 0888-5885; 1520-5045
• DOI: 10.1021/acs.iecr.9b04682

Removal of iron­(III) and aluminum ions from phosphoric acid–nitric acid (PA-NA) solutions including their batch adsorption kinetics on the sulfonic/monophosphonic acid chelation resin (S957) and the dynamic adsorption–elution process at the different operating parameters is studied. The results reveal that Fe­(III) and Al­(III) ions in PA-NA solutions on S957 resin present the slow batch adsorption rate. Their adsorption equilibriums are reached at 60 and 40 min contact times, respectively. The dynamic adsorption process of Fe­(III) and Al­(III) ions is dependent on the feed flow rate through the fixed-bed column, and at the 0.5 mL·min–1 flow rate, Fe­(III) and Al­(III) ions can be greatly removed from PA-NA solutions. In the dynamic elution process, the flow rate shows a little effect on the elution process of Fe­(III) and Al­(III) ions. The better regeneration solution for the dynamic elution process is HCl solution, and the optimized concentration of HCl solution is 8 mol·L–1.