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Recovery of Rare Earth Elements from...

Taggart, Ross Kenneth.

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Recovery of Rare Earth Elements from Coal Combustion Ash: Survey, Extraction, and Speciation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Recovery of Rare Earth Elements from Coal Combustion Ash: Survey, Extraction, and Speciation./
作者:	Taggart, Ross Kenneth.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2018,
面頁冊數:	183 p.
附註:	Source: Dissertations Abstracts International, Volume: 79-11, Section: B.
Contained By:	Dissertations Abstracts International79-11B.
標題:	Environmental engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10748863
ISBN:	9780355907209

Recovery of Rare Earth Elements from Coal Combustion Ash: Survey, Extraction, and Speciation.
Taggart, Ross Kenneth.

Recovery of Rare Earth Elements from Coal Combustion Ash: Survey, Extraction, and Speciation. - Ann Arbor : ProQuest Dissertations & Theses, 2018 - 183 p.

Source: Dissertations Abstracts International, Volume: 79-11, Section: B.

Thesis (Ph.D.)--Duke University, 2018.

This item is not available from ProQuest Dissertations & Theses.

This research explores the beneficial reuse of coal combustion fly ash as a source of rare earth elements (REE). We characterized fly ashes of varied geological origin, tested several extraction methods and parameters, and investigated REE location and speciation in fly ash. Total REE content in a broad sample of U.S. fly ashes were quantified using HF/HNO3 digestion, Na2O2 sintering, and HNO3 digestion. If was found that Appalachian Basin coal ashes had significantly higher total REE content than Illinois Basin or Powder River Basin ashes. However, Powder River Basin ashes had higher HNO3-extractable REE content. Sinter-based extraction methods were tested for REE recovery from fly ash. Optimal sintering conditions were found to be a 1:1 NaOH-ash ratio and 1-2 M HNO3 leaching solution. Bulk and microscale Y speciation in fly ash were compared using sequential selective extractions and x-ray absorption spectroscopy. Bulk speciation suggested Y entrained in the aluminosilicate glass phase while microscale speciation resembled trace yttrium minerals.

ISBN: 9780355907209Subjects--Topical Terms:

548583
Environmental engineering.

Recovery of Rare Earth Elements from Coal Combustion Ash: Survey, Extraction, and Speciation.
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520 $a This research explores the beneficial reuse of coal combustion fly ash as a source of rare earth elements (REE). We characterized fly ashes of varied geological origin, tested several extraction methods and parameters, and investigated REE location and speciation in fly ash. Total REE content in a broad sample of U.S. fly ashes were quantified using HF/HNO3 digestion, Na2O2 sintering, and HNO3 digestion. If was found that Appalachian Basin coal ashes had significantly higher total REE content than Illinois Basin or Powder River Basin ashes. However, Powder River Basin ashes had higher HNO3-extractable REE content. Sinter-based extraction methods were tested for REE recovery from fly ash. Optimal sintering conditions were found to be a 1:1 NaOH-ash ratio and 1-2 M HNO3 leaching solution. Bulk and microscale Y speciation in fly ash were compared using sequential selective extractions and x-ray absorption spectroscopy. Bulk speciation suggested Y entrained in the aluminosilicate glass phase while microscale speciation resembled trace yttrium minerals.
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