Abstract
With the increasing demand for Ti, the amount of Ti scrap is expected to increase. Hence, a new process to efficiently remove oxygen in Ti directly from Ti scrap should be developed to recycle Ti scrap. However, it is difficult to remove oxygen directly from solid Ti, and no effective deoxidation method for Ti scrap has been developed on an industrial scale. In this study, we developed new techniques to remove dissolved oxygen directly from Ti through thermochemical or electrochemical reactions using rare earth metals and/or molten salts. Based on the thermodynamic analysis and experimental verifications, we found that it is possible to remove oxygen in Ti and Ti alloys below 100 mass ppm level directly from high-oxygen-containing metals. This technology is expected to be a new process to remove oxygen directly and efficiently from Ti scrap. Furthermore, the proposed deoxidation technique can be applied to a new smelting process of Ti based on the direct reduction of Ti from oxide feeds.
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