http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Marta Marszałek,Ewa Knapik,Marcin Piotrowski,Katarzyna Chruszcz-Lipska 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
The production of cadmium-free phosphoric acid is crucial for the manufacturing of environmentallyfriendly fertilizers. One of the most promising methods for purification of phosphoric acid is ionexchange/adsorption. The article presents studies on the adsorption of cadmium from a 40 % phosphoricacid solution in the presence of chloride ions with the use of commercially available anion exchangeresins. Five borderline cases were examined in a batch system, as well as kinetic studies were performed. The effect of chloride (0.2–2.2 wt%) and cadmium (5–2500 mg/kg) concentration on adsorption with theuse of two best resins was studied in depth. The Amberlite PWA5 resin was selected for column tests andfor experiments with wet process phosphoric acid simulated solution (WPPA-SS) to prove the concept ofpractical application of the resin. The obtained results indicate that PWA5 has a number of advantagesover the resins tested so far, e.g., the resin is characterized by high cadmium adsorption efficiency(89 % in batch experiments with WPPA-SS and 95.5 % in column tests), the resin effectively adsorbs cadmiumin the presence of low chloride concentrations (0.2–0.5 wt%), and the column with this resin canwork properly even at high flow rates (40 BV/h).