Abstract
To develop a novel recycling process for titanium (Ti) metal scrap by utilizing chloride wastes generated from the Kroll process or any other process, some fundamental studies on the reactions between Ti and iron chlorides (FeClx) were carried out. Prior to the experiments, thermodynamic analyses on the Ti–Fe–Cl–O system were carried out to enable a discussion on the feasibility of the recycling of Ti metal scrap by FeClx. Based on the thermodynamic analyses, a metallic Ti sample placed in a quartz tube filled with argon (Ar) gas was reacted with iron chloride (FeCl2) gas at elevated temperatures (900–1200 K), and the reaction product was analyzed. During the experiment, the formation of TiCl4 gas was visually observed. Black residue containing metallic Fe and Ti was obtained after the experiment, and the reaction ratio of Ti reached 99% under certain experimental conditions. The reaction ratio of Ti and the reaction speed were largely dependant on the morphology of the starting material and could be improved by increasing the reaction temperature over the range of 900–1200 K. The results show that metallic Ti can be recovered in the form of TiCl4 by utilizing FeCl2, and the reaction products of TiCl4 and Fe can easily be recovered separately.
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