PROCESSES FOR TREATING FLY ASHES
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United States of America Patent
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Issued Date -
Feb 4, 2016
app pub date -
Oct 15, 2015
filing date -
Mar 29, 2012
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There are provided processes for treating fly ash. For example, the processes can comprise leaching fly ash with HCl so as to obtain a leachate comprising aluminum ions and a solid, and separating the solid from the leachate; reacting the leachate with HCl so as to obtain a liquid and a precipitate comprising the aluminum ions in the form of AlCl3, and separating the precipitate from the liquid; and heating the precipitate under conditions effective for converting AlCl3 into Al2O3 and optionally recovering gaseous HCl so-produced.
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