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Study on diffusion dialysis process of high concentration nitric acid solution

Authors： Zhao Zongliang, Guo Hongxia,Lin Yuqun,Wang Baoguo, Guo Chunyu

Units： 1. Beijing University of technology, Faculty of materials and manufacturing, Institute of Eco-environmental Materials and Technology, Beijing 100124; 2. Department of chemical engineering, Tsinghua University, Beijing 100084; 3. JINDA Tec electronic systems (Beijing) Co., Ltd., Beijing 100095

KeyWords： diffusion dialysis; nitric acid recovery; ion exchange membrane; diffusion rate in membrane

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2022,42(1):110-114

Abstract：

the diffusion dialysis process of high concentration nitric acid solution containing metal ions was studied by using ion exchange membrane with good acid resistance to recover nitric acid. The effects of feed liquid flow rate, nitric acid concentration and acid water flow rate ratio on acid recovery and metal ion rejection were investigated. The results show that the recovery rate of nitric acid first increases and then decreases with the increase of feed liquid flow rate, decreases with the increase of nitric acid concentration in feed liquid, and increases with the increase of acid water flow rate ratio. When the concentration of nitric acid in feed solution is 7 mol / L, the flow rate is 10.0 ml / min, and the ratio of acid to water is 1:1, the recovery rate of nitric acid and the rejection rate of Fe3+ are 73% and 92%, respectively. According to the diffusion rate of nitric acid in the given ion exchange membrane, combined with Fick's law to regress the parameters of the mathematical model, the reliability of the mathematical model is verified by comparing the calculated results of the model with the actual measured values, which provides a basis for further industrial process design.

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AuthorIntro：

赵宗良（1995—），男，山东枣庄人，硕士研究生，研究方向为离子交换膜扩散渗析研究方向

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