Reaction mechanism and rates were determined from 803 to 1,073 K for the carbochlorination of Al2O3 and of Al, Si, and Fe-mixed oxides using Cl2 and C slurried in a stirred melt of NaCl--AlCl3. Alumina chlorination rates of 0.33-2.0 X 10-8 kmol/s were obtained using C:melt weight ratios between 1:21 and 1:42. The reaction rate was proportional to C loading at temperatures below 923 K, while gas-liquid mass transfer was rate controlling at higher temperatures. Carbochlorination of the combined oxides in coal fly ash at 923 K and oxide conversions less than about 50 pct was also gas-liquid mass-transfer-controlled. At higher conversions, dissolution became the rate-controlling factor. A 40 pct (molar) AlCl3 melt was more effective than a 48 pct AlCl3 melt for the selective chlorination of Al2O3 over SiO2. Research was done at Iowa State University under Grants G1144119 and G1154119.