反応媒体塩中のチタン塩化物の還元メカニズム

概要

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In order to facilitate better understanding of the mechanism of reduction of TiCl4 by Mg in a reaction mediator salt, TiCl4 was injected in to a molten salt mixture containing Dy2+ ions. The salt mixture was equilibrated with a Mg-Ag-Ni alloy kept in a tube and isolated from TiCl4. Fine titanium powder was produced in the molten salt without any physical contact between Mg reductant and TiCl4. During the reduction experiment, the oxidation-reduction potential(ORP) of the molten salt mediator, and the electrochemical potential of the injection tube relative to Mg/Mg2+ reference electrode were continuously monitored. Based on the result obtained, reaction pathways for titanium chloride in the salt mediator are discussed. The new concept of an electronically mediated reaction(EMR) is outlined with the aid of isothermal chemical potential diagrams. Although the overall reduction reaction can be represented in terms of neutral species, as in the conventional treatment of the Kroll process, the electrochemical analysis using the i-E diagram gives a better insight into the mechanistic aspects of the reduction involving the movement of ions and electrons.
1998-08-25