<正> 电解TiCl_4制取海绵钛和粗钛电解精炼的过程中,低价钛浓度和价比,以及温度、电流密度、杂质等,对钛的电结晶有直接的影响。Ануфриева,Alpert,TadanTomonari等人分别对低价钛浓度和价比的影响进行过研究。本文拟进一步探讨它们对钛的电结晶大小影响的原因,并结合电解TiCl_4的实际,加以分析讨论。
The effects of concentration and average valence of titanium subchlorides onthe electrocrystallization of titanium in a NaCl-KCl melt have been investigated.When the Ti ion concentration was about 2% and the average valence was nothigher than 2.4, the crystals obtained were coarse. A possible explanation of thisphenomenon is as follows: In NaCl-KCl melts, complex ions of Ti will form, andchemically, the Ti~(2+) complex ions are less stable as compared to the Ti~(3+) complexions. This will lead to comparatively small overpotential in electrodeposition. There-fore, lower average valence is conductive to the formation of rather coarsercrystals. With a view to improving the current efficiency and the quality of Tiin the electrolysis of TiCl_4 by basket cathode, measures which can raise theconcentration of titanium subchlorides as well as lower the average valence, suchas adding Ti to the gas-melt interface in the basket should be adopted.
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