Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (10): 913-916.doi: 10.3866/PKU.WHXB20031006

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Simulation Study on Ion Exchange Kinetics of Magnesium Ion in Demagging Liquor of Phosphate Ore

Wen Yan-Xuan;Wang Li-Sheng;Jin Zou-Mei   

  1. College of Materials Science and Engineer, South China University of Technology, Guangzhou 510640; College of Chemical Engineer, Sichuan University, Chengdu 610065
  • Received:2003-03-28 Revised:2003-05-28 Published:2003-10-15
  • Contact: Wen Yan-Xuan

Abstract: The ion exchange kinetics with changing bulk concentration of Mg2+ on strong acid resins(001×7×7) was studied. Increasing the initial concentration of Mg2+ and reducing the particle radius can accelerate the exchange rate of Mg2+ .After reaching 315 r•min-1,the stirring speed has little effect on the exchange rate. An integrating equation of moving boundary model was used to describe the kinetics with changing bulk concentration of Mg2+,and the overall kinetically equation was obtained. The ion exchange process of Mg2+ is controlled by ion diffusion through particles. The apparent activation energy is calculated to be 23.45 kJ•mol-1, and apparent reaction order of Mg2+ is 0.68.

Key words: Demagging waste solution of phosphate ore, Ion exchange, Kinetics