Electrolytic mechanism of Al from chloride bath by Hot-Filament methode.

本研究采用热丝法和立体显微镜研究了用氯化物代替氟化物进行铝电解时金属雾的发生行为。 ALCL_3的低温电解在NaCL-ALCL_3或LiCL-ALCL_3浴中进行。铝沉积在NaCL-ALCL_3镀液中表现为树枝状晶体，而在LiCL-ALCL_3镀液中为针状或蓬松状。金属雾的显着现象是沉积铝在镀液中的再溶解，并且在LiCL-ALCL_3镀液中比NaCL-ALCL_3镀液更容易发生。 ALCL_3 的高温电解在 NaCL-LiCL-ALCL_3 浴中开始时呈液滴型，并在 30 60 秒时分层。在这种情况下，短时间内几乎观察不到金属雾。在坩埚法电解中，Al的回收比在电解槽中添加固体ALCL_3比添加气态ALCL_3更有优势。

This study was investigated the behaviour of occurrence of metal fog by the Hot-Filament methode and stereoscopic microscope on the aluminium electrolysis using chloride instead of fluoride. The low-temperature electrolysis of ALCL_3 was carried out in NaCL-ALCL_3 or LiCL-ALCL_3 bath. Apperance of aluminum deposition was shown the dendritic crystal in NaCL-ALCL_3 bath, but it in LiCL-ALCL_3 bath was needle or fluffy shape.The remarkable phenomena of metal fog is redissolution of depositted aluminum into bath, and it was easily ocurred in LiCL-ALCL_3 bath than NaCL-ALCL_3 bath. The high-temperature electrolysis of ALCL_3 was indicated a droplet type at start and layer at 30 60 sec in NaCL-LiCL-ALCL_3 bath. Inthis case, metal fog was observed hardly in short period of time.On the electrolysis in crusible methode, the recovery of Al has on advantege over the addition of vaporized ALCL_3 than the addition of solid ALCL_3 in the bath.