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

Add time:07/19/2019    Source:sciencedirect.com

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 m2·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 °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.

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