Quantitative Analysis of Titanium Ions in the Equilibrium with Metallic Titanium in NaCl-KCl Equimolar Molten Salt

The equilibrium between titanium ions (Ti2+, Ti3+) and metallic titanium (Ti) in NaCl-KCl equimolar molten salt was investigated using TiCl3 and Ti. Equilibrium experiments were carried out in metal container of titanium or stainless-steel at 740 degrees C. The concentrations of titanium ions were determined by chemical methods consisting of continuous three steps. Ti2+ and Ti were quantitated by H-2 evolution method. Ti3+ was quantitated with titration by Fe3+. As the result, the concentration of Ti2+ was higher than that of Ti3+. The concentration quotient, K-c = (x(Ti3+))(2)/(x(Ti2+))(3), depends on the concentration of Ti2+. The value of K-c at 740 degrees C is recommended to be 5.9 at x(Ti2+) = 0.02 and 2.6 at x(Ti2+) = 0.07 respectively. [doi:10.2320/matertrans.M2010238]