2008, Alkaline hydrothermal conversion of fly ash precipitates into zeolites 3: the removal of mercury and lead ions from wastewater

Somerset V1, Petrik L, Iwuoha E

J Environ Manage. 2008 Apr;87(1):125-31. Epub 2007 Mar 19

https://www.ncbi.nlm.nih.gov/pubmed/17368920