Production of Liquid Alloy of Titanium by Electrodeposition

电沉积法生产液态钛合金

• 批准号: 63470046
• 负责人: ISHIKAWA Tatsuo
• 金额: $ 3.39万
• 依托单位: Hokkaido 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: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-63470046/
• 关键词: Electrowinning of titanium; Electrodeposition; Bipolar electrode cell; Al_3Ti; Titanium tetrachloride; Al_3Ti dispersed aluminum; Molten salt electrolysis; Galvanic displacement; 溶融塩内反応; 塩化アルミニウム; 撹拌効果; 溶融塩; 合金電析; 金属間化合物

An attempt to produce liquid Al-base alloy of Ti was carried out by electrodeposition of Ti on liquid Al and its alloy from a equimolar NaCl-KC1 melt containing TiCl_4 at 750 C. To recover Ti as a liquid alloy has great advantage comparing with its recovery as a solid state; the problems related with crystalline morphology are eliminated and the disproportionation reaction is also avoided due to the low activity of Ti on the alloy surface.The results are as follows: 1) The Ti concentration of 7 % as the maximum value is achieved in a stacked bipolar electrode cell composed of Al-Cu alloy cathodes. 2) The experiment on solubility of Ti in the alloys shows that solid particles of intermetallic compound of Al_3Ti deposit in the Al-Ni and Al-Cu alloys in the concentration range over 0.3 % Ti. It also shows that employing pure.Al as a cathode is advisable to obtain high concentration of Ti in the liquid alloy. 3) The electrolysis experiments in a cell composed of a unit cathode-anode system show that the mechanical stirring of alloy is effective to precipitate Al_3Ti particles in the bottom of the liquid electrode. 4) A spiral type supplier of TiCl_4 was developed to contact TiCl_4 gas with the melt sufficiently and it achieves high concentration of TiCl_4. Liquid Al in the melt also reacts with TiCl_4 to produce Al_3Ti. 5) The rate of reaction producing Al_3Ti increases with the concentration of AlCl_3 in the melt. The particles of Al_3Ti are dispersed homogeneously into the liquid Al by perturbation of Al surface by Ar gas bubbling.Above results show that electrowinning of Ti as a liquid alloy from TiCl_4 can be an attractive process for the new usage of Ti component.

在750℃等摩尔的含TiCl4的氯化钠-氯化钾熔体中，通过在液态铝及其合金上电沉积钛来制备液态钛。与固态回收相比，液态钛的回收具有很大的优势；由于钛在合金表面的低活性，消除了与结晶形态有关的问题，并避免了歧化反应。结果如下：1)在由铝-铜合金阴极组成的堆叠式双极电极单元中，钛的最大浓度为7%。2)钛在合金中的溶解度实验表明，Al-Ni和Al-Cu合金中沉积的Al_3Ti金属间化合物固体颗粒的浓度范围均在0.3%以上。研究还表明，采用纯铝作为阴极，可以获得较高的钛含量。3)在由阴阳极单元组成的电解槽中进行的电解实验表明，合金的机械搅拌能有效地将Al_3Ti颗粒析出在液体电极底部。4)开发了螺旋式TiCl4供应器，使TiCl4气体与熔体充分接触，获得了高浓度的TiCl4。熔体中的液态Al还与TiCl4反应生成Al_3Ti。5)反应生成Al_3Ti的速率随熔体中AlCl3浓度的增加而增加。在Ar气泡作用下，Al表面发生扰动，使Al_3Ti颗粒均匀地分散在Al液中。结果表明，从TiCl4中以液态合金的形式电沉积钛是一种极具吸引力的新工艺。