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Fundamental Studies on Fused Salt Electrolysis Process of Titanium Which Is Electrowon in Molten State.

熔融态电沉积钛熔盐电解过程的基础研究。

基本信息

批准号：
62470054
负责人：
YAMAUCHI Chikabumi
金额：
$ 3.84万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

项目摘要

Two kinds of fundamental studies performed in order to establish the fused salt electrolysis process of titanium which is electrowon in molten state by being alllowed to dissolve into molten zinc. (1) Separation of zinc by vaporization from zinc-titanium alloy:There are several kinds of matallic compounds in the zinc-titanium system. In order to obtain clean titanium by separating zinc from zinc-titanium alloy, it is desired that the metallic compounds can be thermally decomposed at a temperature as low as possible. For this reason the vaporization separatuin bahaviors of zinc from zinc-titanium alloy containing 7.5% titanium by weight were examined at various constant temperatures in an argon atmosphere of 0.1 MPa by using a thermobalance. From this experiment it was found that TiZn_3 remained as it was without being thermally decomposed at temperatures lower than 600゜C, while at temperatures higher than 620゜C it was thermally decomposed to produce metallic titanium. It became also ev … More ident that the vaporization rate of zinc was determined by mass transfer in gas phase. (2) Clarification of electrolytic reduction process of trivalent titanium ions: This is a fundamental study required to design the fused salt electrolysis cell. From (i) voltammetric analysis of BaCl_2-CaCl_2-NaCl fused salt containing TiCl_3, (ii) reduction of TiCl_3 in BaCl_2-CaCl_2-NaCl fused salt by magnesium-zinc alloy or metallic titanium,and (iii) thermodynamic consideration of titanium-chlor potential diagram, it was found that trivalent titanium ion in chloride electrolyte was electrolytically reduced via divalent titanium ion to metallic titanium, This suggests that partitions should be arranged in the electrlysis cell. Further problems are to examine (i) supplying procedure and dissolution rate of TiCl_4 into the fused salt, (ii) factors controlling the balance of dissolution rate of TiCl_4 with electrodeposition rate of titanium, (iii) dissolution rate of electrodeposited titanium into molten zinc, etc. Less

为了建立熔盐电解钛的工艺，进行了两类基础性研究。(1)锌钛合金中锌的蒸发分离：锌钛体系中存在多种金属化合物。为了通过从锌-钛合金中分离锌来获得清洁的钛，期望金属化合物能够在尽可能低的温度下热分解。为此，用热天平在0.1MPa的氩气气氛中，在不同的恒温条件下，研究了锌从含钛7.5%（重量）的锌钛合金中的蒸发分离过程。从该实验中发现，TiZn_3在低于600 ℃的温度下保持原样而不热分解，而在高于620 ℃的温度下热分解以产生金属钛。它也成为ev ...更多信息证明锌的蒸发速率是由气相中的传质决定的。(2)三价钛离子电解还原过程的澄清：这是设计熔盐电解槽所需的基础研究。通过对含TiCl_3的BaCl_2-CaCl_2-NaCl熔盐体系的伏安分析、镁锌合金或金属钛对BaCl_2-CaCl_2-NaCl熔盐体系中TiCl_3的还原以及钛-氯电位图的热力学分析，发现氯化物电解液中的三价钛离子经二价钛离子电解还原为金属钛，这表明电解槽中应设置隔板。进一步的问题是研究（i）TiCl_4在熔盐中的加入程序和溶解速率，（ii）控制TiCl_4溶解速率与钛电沉积速率平衡的因素，（iii）电沉积钛在熔融锌中的溶解速率等。