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PURIFICATION OF AlCl3 -KC1-NaCI MELTS The purification procedure for IuC13, described in our earlier report, was modified by producing finely divided A1 in situ in order to reduce the ionic iron con- tent of the melt before evaporation of the A1C13. A quartz rack containing three electrodes (an A1 wire in the center, an A1 sheet cylinder as counterelectrode, and a Pt wire electrode) and a baffle were introduced into a 2- kettle which was sur- rounded by a heating mantle and which contained a Teflon-coated, magnetic stirring bar. A 1500-g salt mixture of AlC13 -KCl-NaCl ( 67.5- 13.38- 19.1 wt %) was intro- duced into the vessel. Between I30and 14 "C, the resulting melt had only a mod- erate AlCls vapor pressure. By using a high current (-fQ A) between the A1 electrodes, dendrites were formed at the wire electrode and partially separated from the electrode upon current reversal. Thus, hi surface A1 was produced in situ. The melt was kept under constant stirring at 0 "C for 24 to 36 hr. The progress of the exchange of Fe3+for A13+was monitored by cyclic poten- tial sweeps at the Pt wire electrode. A reduction in the ionic iron of more than a factor of 25was obtained. This procedure was then followed by raising rhe temper- ature and evaporating the AlCls into an aircooled, 1-1 reaction kettle placed upside down on top of the reaction vessel, as described earlier.PDF Image | NASA ALUMINUM CHLORINE BATTERY
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