A Process for Producing Aluminum and Silicon Alloys.
Sullivan-TA; Singleton-EL; Johnson-ML
U S Pat 3 798 140 1974 Mar; :
A method is provided for separating aluminum from al-si alloys produced by smelting aluminum silicate ores. The anode residue is leached to produce metallurgical-grade silicon. Thus, 50.0 Al-45.8 Si-0.3 pct fe was processed by using a nacl-kcl-alcl3 electrolyte at 750 deg. C. The electrolyte was an equimolar mixture of nacl and kcl to which 10 pct alcl3 was added to provide the al carrier ion. Al (99.98 pct) was prepared. An al recovery of 82 pct and a cathode efficiency of 98 pct was achieved. In theory, the process involves selective electrooxidation of al from the al-si anode and simultaneous reduction of al at the cathode.
U.S. Pat. 3,798,140; Mar. 19, 1974; Chem. Abstr. 81:28,105J