It is the most desirable to recover the valuables from coal ash and to utilize all the coal ash with the treated residue, regarding coal ash produced in large quantity in the future as ground mineral materials already delivered in factory.
For the above purpose, I reviewed the various metal (Al, Fe, Ti) recovery processes from coal ash, and compared their features on the basis of the literature. And I discribed briefly present technical status in Japan.
As the process which seems to be economical, I can list up Direct Acid Leaching process, Hichlor process, Fluorination process, and Calcinter process. Considering technical maturity degree, pollution problem, and site condition for delivery of lime, EPRI's DAL process is thought to be the most easy to commercialize.
I introduced briefly DAL process on the basis of the report of the study results, and explained the remarkable feature.
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