INVESTIGATION OF HIGH-TEMPERATURE MOLTEN- SALTS PREDOMINANTLY COMPOSED OF CHLORIDE FOR ALUMINUM-ELECTROREFINING

Citation
M. Ueda et al., INVESTIGATION OF HIGH-TEMPERATURE MOLTEN- SALTS PREDOMINANTLY COMPOSED OF CHLORIDE FOR ALUMINUM-ELECTROREFINING, Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 63(7), 1995, pp. 664-668
Citations number
7
Categorie Soggetti
Electrochemistry
ISSN journal
03669297
Volume
63
Issue
7
Year of publication
1995
Pages
664 - 668
Database
ISI
SICI code
0366-9297(1995)63:7<664:IOHMSP>2.0.ZU;2-T
Abstract
For electrorefining of Al from aluminum scraps by using a bipolar elec trode system, characteristics of BaCl2-NaCl, less-corrosive melts to c ell materials than fluoride melts, were investigated. Measuring the de nsities as a function of their compositions showed that melts containi ng BaCl2 over 50 mol% had higher densities than that of liquid Al (2.3 5 g . cm(-3) at 800 degrees C) and were applicable as a base melt to t he bipolar electrode system. Next, methods for adding aluminum compone nts into the BaCl2-NaCl were examined in terms of their solubilities a nd stabilities. Only by feeding double salts of 40 similar to 43 mol% AlF3-NaF, a significant concentration of aluminum components was attai ned in the BaCl2-NaCl. The proposed melt for the bipolar electrode sys tem is as follows, 10 mol% AlF3 15 mol% NaF-41 mol% BaCl2-34 mol% NaCl . The low corrosivity of this melt against quartz materials has also b een confirmed.