Abstract
The high-temperature chlorination of the aluminium fraction in Alberta coal ash was investigated experimentally using a gas-fluidized bed reactor. With carbon (fluid coke) and carbon monoxide present as reducing agents, about 25% of aluminium in ash could be chlorinated in 2 h at temperatures above 900 C. By using standard statistical technique, it was discovered that the chlorination of aluminium above 900 C was unaffected by a variation in temperature. On the other hand, reducing the particle size and increasing the Cl/sub 2//CO ratio did have beneficial effects. Global reaction rate data indicate two very distinct reaction regions. In the first 10 min a high chlorination rate was observed (i.e., about 9 g of aluminium chlorinated/kg of initial Al-min). This was followed by a second region (10-120 min) where the global rate was reduced by a factor of about 7 and reached a constant value. Reasons for the changing reaction conditions are also discussed.
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