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Carbochlorination of Fly Ash in a Fused Salt Slurry Reactor.
Mat Res Soc Symp Proc 1987 86:381-391
Carbochlorination of the metal oxides in fly ash by suspending the solid reactants in a nacl-alcl3 melt at 530 to 850 deg c and then sparging chlorine into the melt has been investigated. A mechanically agitated, semibatch reactor was used to test the effects of temperature, oxide and carbon loading, salt composition, and gas flow on the reaction rate. The process was modeled using the carbochlorination of pure alumina, the rate of which was found to be chemical reaction controlled at temperatures below about 650 deg c and gas-liquid mass transfer controlled at higher temperature. The carbochlorination rate of the mixed oxides in coal fly ash was also mass transfer controlled at higher temperatures when aluminum recoveries were less than about 50 pct. At higher aluminum recoveries, the overall rate was limited by the rate of ash dissolution into the melt. Research was done at Iowa state University under grant g1144119.
OP; Final Contract Report;
Mat. Res. Soc. Symp. Proc., V. 86, 1987, PP. 381-391
Iowa State University
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