|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Aluminum Reduction Technology
||Stability of Chlorides in Cryolitic Electrolyte
||Luis H Espinoza-Nava, Xiangwen Wang
|On-Site Speaker (Planned)
Chloride is considered one of the most important contaminants in cryolitic electrolyte system for aluminum smelting. Chloride salts such as NaCl, MgCl2 and others have also been chosen for potential additives to change the electrolyte physical chemical properties for smelting efficiency improvement. This paper studied the chloride stability in the cryolitic electrolyte system. The behavior of NaCl and MgCl2 was investigated when there is a moisture present with or without electrolysis or when there is anode effect. HCl will be generated along with HF during a normal electrolysis even when chloride in the electrolyte is at a low level. CF3Cl gas is generated along with CF4 and C2F6 when anode effect occurs. The results confirm that even though chlorides (NaCl/MgCl2) are considered the most important contaminants, the level of the contaminants remains relatively low in the smelting electrolyte without obvious accumulation over time.
||Planned: Light Metals