Anion-exchange Behavior of Mo(V) and W(VI) in HCl Solutions

作者：Uchikoshi Masahito^*; Nagahara Tadasuke; Lim Jae Won; Kim Sang Bae; Mimura Kouji; Isshiki Minoru

来源：High Temperature Materials and Processes, 2011, 30(4-5): 345-351.

DOI：10.1515/HTMP.2011.055

• Purification
• anion-exchange
• distribution coefficient
• absorption spectrum

The distribution coefficients of Mo(V) and W(VI) on anion-exchange resin from hydrochloric acid solutions, the separation factor of W(VI) over Mo(V), and adsorption isotherm of Mo(V) at 30 degrees C were investigated as the fundamentals of chemical separation process of Mo and W. Prior to the acquiring the equilibrium distribution coefficients, the stability of Mo(V) oxy-chloro complex were examined using spectrophotometer and the solubility of WCl6 in HCl solution was determined. Molybdenum(V) adsorbs on anion-exchange resin strongly in >4 M HCl and slightly in <2 M HCl and the distribution coefficients of Mo(V) are always higher than those of W(VI). Taking both the distribution coefficients and the separation factors into consideration predicts that the optimum condition for the separation of Mo(V) and W(Vl) is in 2 M HCl at 30 degrees C. In addition, adsorption isotherm of Mo(V) shows that the distribution coefficients in 2 M HCl is independent of the concentration of Mo(V) in the solution phase.

• 出版日期2011-8