Preparation of Na specific absorbent and application of sodium removal from ammonium tungstate solution

作者：Zhao, Zhong-wei^*; Yang, Mao-feng; He, Li-hua; Zhang, Jia-liang; Chen, Xing-yu; Liu, Xu-heng

来源：Transactions of Nonferrous Metals Society of China, 2014, 24(3): 854-860.

DOI：10.1016/S1003-6326(14)63135-6

• Na specific adsorbent
• sodium removal
• ammonium tungstate
• purification

An adsorbent, Na1.6Al0.6Ti1.4(PO4)(3) (or NATP), was prepared by controlled crystallization of glasses in the Na2O-Al2O3-CaO-TiO2-P2O5 system. The crystalline phases characterized by X-ray diffraction (XRD) show that the sample glasses crystallizes into two phases, i.e. NATP and Ca9Al(PO4)(7), while the Ca9Al(PO4)(7) phase can be leached selectively with HCl, leaving a massive number of pores in the material. Through the experimental research, the effects of contact time, solution pH, and the initial concentration of Na+ on the cation exchange properties were investigated. The batch sorption kinetics and equilibria can be described by Pseudo-second-order kinetic equations and Langmuir isotherm equations respectively. Furthermore, the experiments with an industrial solution show that the removal rate of sodium from industrial (NH4)(2)WO4 is higher than 97%. Cycle experiment also shows that the NATP has a good cyclic performance.

• 出版日期2014-3
• 单位中南大学