| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for producing metal Ti with high efficiency by a kroll process where TiCl<SB>4</SB>is reduced with Mg. <P>SOLUTION: A mixed molten salt comprising CaCl<SB>2</SB>and NaCl is held at≤600°C within a reaction tank 1. Na is introduced into the reaction tank 1, and further, TiCl<SB>4</SB>as a Ti raw material is introduced therein. The Na introduced into the reaction tank 1 is made into Ca, is dissolved into the molten salt and reduces the TiCl<SB>4</SB>introduced into the molten salt, thus Ti grains are produced. The produced Ti grains are introduced into a separation tank 2 together with the molten salt, and the Ti grains and Na are separated from the molten salt. The remaining molten salt is introduced into an electrolytic cell 3, and is electrolyzed at a high temperature of≥600°C to produce Na. The produced Na is returned to the reaction tank 1, and replenishes the Na consumed in the reaction tank 1. Utilizing the reverse reaction by the temperature change in the molten salt with 600°C as a critical point, Ca having high reactivity is not directly used but easily treatable Na is circularly used, thus the production of Ti by Ca reduction is economically performed. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
