Mechanism and kinetics study on removal of Iron from phosphoric acid by cation exchange resin

作者：Leng, Xinke; Zhong, Yanjun; Xu, Dehua; Wang, Xinlong; Yang, Lin^*

来源：Chinese Journal of Chemical Engineering, 2019, 27(5): 1050-1057.

DOI：10.1016/j.cjche.2018.09.012

• Purification of wet-process phosphoric acid
• Cation exchange resin
• Kinetics models
• Diffusion models

Iron element is one of the main impurities in wet-process phosphoric acid and it has a significant impact on the subsequent phosphorus chemical products. This paper studied the feasibility of using Sinco-430 cation exchange resin for iron removal from phosphoric acid. The specific surface area and the total exchange capacity of resin were 8.91 m(2).g(-1) and 5.18 mmol.g(-1), respectively. The sorption mechanism was determined by FTIR and XPS and the results indicated that iron was combined with -SO3H in resin. The removal process was studied as a function of temperature, H3PO4 content and mass ratio between resin and solution. The unit mass of resin to remove iron was 0.058 g.g(-1) resin when the operating parameters were T = 50 degrees C, H3PO4 content = 27.61 wt% and S/L = 0.1, respectively. Kinetics study demonstrated that pseudo-second-order reaction model fits this study best and the calculated activation energy of overall reaction is 29.10 kJ.mol(-1). The overall reaction process was mainly controlled by pore diffusion.

• 出版日期2019-5
• 单位四川大学