Removal of elements from coal fly ash
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United States of America Patent
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Jan 24, 2017
Grant Date -
Nov 28, 2013
app pub date -
May 23, 2013
filing date -
May 23, 2012
priority date (Note) -
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Abstract
A method for removing elements, including heavy metals, from fly ash and from fly ash resulting from removal of SOx/NOx from flue gas using Na2CO3/NaHCO3/trona, is described. An aqueous suspension of the fly ash and/or a solution of the leachate from the fly ash is treated with dissolved ferrous compounds, such as FeSO4.7H2O and/or FeCl2.4H2O, at a chosen initial acidic pH, and the precipitation of the ferrous ions as the solution basifies sequesters the trace elements.
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