Differences in bulk and microscale yttrium speciation in coal combustion fly ash

doi:10.1039/C8EM00264A

Title: Differences in bulk and microscale yttrium speciation in coal combustion fly ash

Abstract

Coal combustion ash is a promising alternative source of rare earth elements (REE; herein defined as the 14 stable lanthanides, yttrium, and scandium). Efforts to extract REE from coal ash will depend heavily on the location and speciation of these elements in the ash. This study sought to identify the major chemical forms of yttrium (Y), as a representative REE in coal fly ash samples selected from major coal sources in the United States. Y speciation was evaluated using both bulk scale analyses (sequential extractions, Y K-edge X-ray absorption near-edge spectroscopy – XANES) and complementary analyses at the micron scale (micro-focus X-ray fluorescence and micro-XANES). Sequential selective extractions revealed that the REE were primarily in the residual (unextracted fraction) of coal fly ash samples. Extraction patterns for yttrium resembled those of the lanthanides, indicating that these elements were collectively dispersed throughout the aluminosilicate glass in fly ash. Bulk XANES analysis indicated that Y coordination states resembled a combination of Y-oxides, Y-carbonate, and Y-doped glass, regardless of ash origin. However, in the microprobe analysis, we observed “hotspots” of Y (~10–50 μm) in some samples that included different Y forms (e.g., Y-phosphate) not observed in bulk measurements. Overall, this study demonstrated thatmore »« less

Authors:

Taggart, Ross K. ^[1];

^[1];

^[2];

^[2]; Borschneck, Daniel ^[2];

^[3];

^[1]

Department of Civil and Environmental Engineering, Duke University, Durham, USA
Aix Marseille Univ, CNRS, IRD, INRA, Coll France
Center for Applied Energy Research, University of Kentucky, Lexington, USA

Publication Date:: 2018-10-17

Research Org.:: Duke Univ., Durham, NC (United States)

Sponsoring Org.:: USDOE Office of Fossil Energy (FE)

OSTI Identifier:: 1474753

Alternate Identifier(s):: OSTI ID: 1483484

Grant/Contract Number:: FE0026952

Resource Type:: Published Article

Journal Name:: Environmental Science: Processes & Impacts

Additional Journal Information:: Journal Name: Environmental Science: Processes & Impacts Journal Volume: 20 Journal Issue: 10; Journal ID: ISSN 2050-7887

Publisher:: Royal Society of Chemistry (RSC)

Country of Publication:: United Kingdom

Language:: English

Subject:: 36 MATERIALS SCIENCE

Citation Formats


                    Taggart, Ross K., Rivera, Nelson A., Levard, Clément, Ambrosi, Jean-Paul, Borschneck, Daniel, Hower, James C., and Hsu-Kim, Heileen. Differences in bulk and microscale yttrium speciation in coal combustion fly ash.  United Kingdom: N. p., 2018. 
        Web.  doi:10.1039/C8EM00264A.

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                    Taggart, Ross K., Rivera, Nelson A., Levard, Clément, Ambrosi, Jean-Paul, Borschneck, Daniel, Hower, James C., & Hsu-Kim, Heileen. Differences in bulk and microscale yttrium speciation in coal combustion fly ash.  United Kingdom.  doi:10.1039/C8EM00264A.

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                    Taggart, Ross K., Rivera, Nelson A., Levard, Clément, Ambrosi, Jean-Paul, Borschneck, Daniel, Hower, James C., and Hsu-Kim, Heileen. Wed .  
        "Differences in bulk and microscale yttrium speciation in coal combustion fly ash".  United Kingdom.  doi:10.1039/C8EM00264A.

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@article{osti_1474753,

  title        = {Differences in bulk and microscale yttrium speciation in coal combustion fly ash},

  author       = {Taggart, Ross K. and Rivera, Nelson A. and Levard, Clément and Ambrosi, Jean-Paul and Borschneck, Daniel and Hower, James C. and Hsu-Kim, Heileen},

  abstractNote = {Coal combustion ash is a promising alternative source of rare earth elements (REE; herein defined as the 14 stable lanthanides, yttrium, and scandium). Efforts to extract REE from coal ash will depend heavily on the location and speciation of these elements in the ash. This study sought to identify the major chemical forms of yttrium (Y), as a representative REE in coal fly ash samples selected from major coal sources in the United States. Y speciation was evaluated using both bulk scale analyses (sequential extractions, Y K-edge X-ray absorption near-edge spectroscopy – XANES) and complementary analyses at the micron scale (micro-focus X-ray fluorescence and micro-XANES). Sequential selective extractions revealed that the REE were primarily in the residual (unextracted fraction) of coal fly ash samples. Extraction patterns for yttrium resembled those of the lanthanides, indicating that these elements were collectively dispersed throughout the aluminosilicate glass in fly ash. Bulk XANES analysis indicated that Y coordination states resembled a combination of Y-oxides, Y-carbonate, and Y-doped glass, regardless of ash origin. However, in the microprobe analysis, we observed “hotspots” of Y (~10–50 μm) in some samples that included different Y forms (e.g., Y-phosphate) not observed in bulk measurements. Overall, this study demonstrated that yttrium (and potentially other REEs) are entrained in the glass phase of fly ash and that microscale investigations of individual high-REE regions in fly ash samples do not necessarily capture the dominant speciation.},

  doi          = {10.1039/C8EM00264A},

  journal      = {Environmental Science: Processes & Impacts},

  number       = 10,

  volume       = 20,

  place        = {United Kingdom},

  year         = {2018},

  month        = {10}

}

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DOI: 10.1039/C8EM00264A

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Nano-Scale Rare Earth Distribution in Fly Ash Derived from the Combustion of the Fire Clay Coal, Kentucky
journal, March 2019

Hower, James; Qian, Dali; Briot, Nicolas
Minerals, Vol. 9, Issue 4
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Title: Differences in bulk and microscale yttrium speciation in coal combustion fly ash

Abstract

Citation Formats

Trace elements in coal and their behaviour during combustion in a large power station journal, March 1995

ATHENA , ARTEMIS , HEPHAESTUS : data analysis for X-ray absorption spectroscopy using IFEFFIT journal, June 2005

Association characteristic study and preliminary recovery investigation of rare earth elements from Fire Clay seam coal middlings journal, March 2018

Metalliferous coals: A review of the main genetic and geochemical types journal, December 2008

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Application of sequential extraction and the ICP-AES method for study of the partitioning of metals in fly ashes journal, June 2002

Location of Cerium in Coal-Combustion Fly Ashes: Implications for Recovery of Lanthanides [English] journal, January 2003

Application of methods (sequential extraction procedures and high-pressure digestion method) to fly ash particles to determine the element constituents: A case study for BCR 176 journal, April 2009

Leaching behaviour of elements from coal combustion fly ash: An overview journal, May 2012

Preparation of well-defined colloidal particles by thermal decomposition of metal chelates. I. Iron oxides journal, April 1980

Coal deposits as potential alternative sources for lanthanides and yttrium journal, May 2012

Elemental distribution in coal fly ash particles journal, September 1980

Monitoring the species of arsenic, chromium and nickel in milled coal, bottom ash and fly ash from a pulverized coal­fired power plant in western Canada journal, January 2001

Effects of roasting additives and leaching parameters on the extraction of rare earth elements from coal fly ash journal, August 2018

Lanthanide, yttrium, and zirconium anomalies in the Fire Clay coal bed, Eastern Kentucky journal, March 1999

Distribution of rare earth elements in coal combustion fly ash, determined by SHRIMP-RG ion microprobe journal, November 2017

Rare earth elements in fly ashes created during the coal burning process in certain coal-fired power plants operating in Poland – Upper Silesian Industrial Region journal, November 2010

Petrology, Mineralogy, and Chemistry of Size-Fractioned Fly Ash from the Jungar Power Plant, Inner Mongolia, China, with Emphasis on the Distribution of Rare Earth Elements journal, January 2014

A Review of the Occurrence and Promising Recovery Methods of Rare Earth Elements from Coal and Coal By-Products journal, July 2015

Coal as a promising source of critical elements: Progress and future prospects journal, February 2018

Sequential extractions for determination of cadmium distribution in coal fly ash, soil and sediment samples journal, November 1999

A technique for sequential leaching of coal and fly ash resulting in good recovery of trace elements journal, March 2010

Use of a certified reference material for extractable trace metals to assess sources of uncertainty in the BCR three-stage sequential extraction procedure journal, March 1999

Notes on Contributions to the Science of Rare Earth Element Enrichment in Coal and Coal Combustion Byproducts journal, March 2016

Arsenic and Mercury Partitioning in Fly Ash at a Kentucky Power Plant journal, July 2003

Elemental characterization of coal ash and its leachates using sequential extraction techniques journal, May 1995

An investigation into six coal fly ashes from the United Kingdom and Poland to evaluate rare earth element content journal, March 2014

Trends in the Rare Earth Element Content of U.S.-Based Coal Combustion Fly Ashes journal, May 2016

Enrichment of rare earth elements from coal and coal by-products by physical separations journal, July 2017

Rare Earth Element Distribution in Fly Ash Derived from the Fire Clay Coal, Kentucky journal, January 2017

Aqueous acid and alkaline extraction of rare earth elements from coal combustion ash journal, July 2018

Distribution of rare earth elements in eastern Kentucky coals: Indicators of multiple modes of enrichment? journal, April 2016

Coal deposits as promising sources of rare metals for alternative power and energy-efficient technologies journal, April 2013

Impact of coal properties on coal combustion by-product quality: examples from a Kentucky power plant journal, August 2004

Major and Minor Element Distribution in Fly Ash from a Coal-Fired Utility Boiler in Kentucky journal, January 2006

A critical evaluation of the three-stage BCR sequential extraction procedure to assess the potential mobility and toxicity of heavy metals in industrially-contaminated land journal, May 1998

Comparison of original and modified BCR sequential extraction procedures for the fractionation of copper, iron, lead, manganese and zinc in soils and sediments journal, February 2003

Influence of trace metal distribution on its leachability from coal fly ash journal, August 2008

Evaluation of a sequential extraction procedure for the determination of extractable trace metal contents in sediments journal, January 1994

Coal fly ash as a resource for rare earth elements journal, January 2015

Behavior of natural radionuclides in western coal-fired power plants journal, April 1978

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Distribution and speciation of rare earth elements in coal combustion by-products via synchrotron microscopy and spectroscopy journal, July 2018

Evaluating Rare Earth Element Availability: A Case with Revolutionary Demand from Clean Technologies journal, February 2012

Characterization of fly ash from Kentucky power plants journal, March 1996

Size-Dependent Variations in Fly Ash Trace Element Chemistry: Examples from a Kentucky Power Plant and with Emphasis on Rare Earth Elements journal, December 2016

Rare earth element-bearing coals from the Russian Far East deposits journal, June 1996

Determination of the host phase of rare earth elements in natural carbonate using X-ray absorption near-edge structure journal, January 2009

Overview of trace element partitioning in flames and furnaces of utility coal-fired boilers journal, August 1994

Chemistry and petrology of paired feed coal and combustion ash from anthracite-burning stoker boilers journal, July 2017

Nano-Scale Rare Earth Distribution in Fly Ash Derived from the Combustion of the Fire Clay Coal, Kentucky journal, March 2019

Trace elements in coal and their behaviour during combustion in a large power station
journal, March 1995

ATHENA , ARTEMIS , HEPHAESTUS : data analysis for X-ray absorption spectroscopy using IFEFFIT
journal, June 2005

Association characteristic study and preliminary recovery investigation of rare earth elements from Fire Clay seam coal middlings
journal, March 2018

Metalliferous coals: A review of the main genetic and geochemical types
journal, December 2008

Rare earth elements as critical raw materials: Focus on international markets and future strategies
journal, March 2013

Ponded and Landfilled Fly Ash as a Source of Rare Earth Elements from a Kentucky Power Plant
journal, January 2017

Chemical Composition, Speciation, and Elemental Associations in Coal Fly Ash Samples Related to the Kingston Ash Spill
journal, January 2015

Application of sequential extraction and the ICP-AES method for study of the partitioning of metals in fly ashes
journal, June 2002

Location of Cerium in Coal-Combustion Fly Ashes: Implications for Recovery of Lanthanides [English]
journal, January 2003

Application of methods (sequential extraction procedures and high-pressure digestion method) to fly ash particles to determine the element constituents: A case study for BCR 176
journal, April 2009

Leaching behaviour of elements from coal combustion fly ash: An overview
journal, May 2012

Preparation of well-defined colloidal particles by thermal decomposition of metal chelates. I. Iron oxides
journal, April 1980

Coal deposits as potential alternative sources for lanthanides and yttrium
journal, May 2012

Elemental distribution in coal fly ash particles
journal, September 1980

Monitoring the species of arsenic, chromium and nickel in milled coal, bottom ash and fly ash from a pulverized coalfired power plant in western Canada
journal, January 2001

Effects of roasting additives and leaching parameters on the extraction of rare earth elements from coal fly ash
journal, August 2018

Lanthanide, yttrium, and zirconium anomalies in the Fire Clay coal bed, Eastern Kentucky
journal, March 1999

Distribution of rare earth elements in coal combustion fly ash, determined by SHRIMP-RG ion microprobe
journal, November 2017

Rare earth elements in fly ashes created during the coal burning process in certain coal-fired power plants operating in Poland – Upper Silesian Industrial Region
journal, November 2010

Petrology, Mineralogy, and Chemistry of Size-Fractioned Fly Ash from the Jungar Power Plant, Inner Mongolia, China, with Emphasis on the Distribution of Rare Earth Elements
journal, January 2014

A Review of the Occurrence and Promising Recovery Methods of Rare Earth Elements from Coal and Coal By-Products
journal, July 2015

Coal as a promising source of critical elements: Progress and future prospects
journal, February 2018

Sequential extractions for determination of cadmium distribution in coal fly ash, soil and sediment samples
journal, November 1999

A technique for sequential leaching of coal and fly ash resulting in good recovery of trace elements
journal, March 2010

Use of a certified reference material for extractable trace metals to assess sources of uncertainty in the BCR three-stage sequential extraction procedure
journal, March 1999

Notes on Contributions to the Science of Rare Earth Element Enrichment in Coal and Coal Combustion Byproducts
journal, March 2016

Arsenic and Mercury Partitioning in Fly Ash at a Kentucky Power Plant
journal, July 2003

Elemental characterization of coal ash and its leachates using sequential extraction techniques
journal, May 1995

An investigation into six coal fly ashes from the United Kingdom and Poland to evaluate rare earth element content
journal, March 2014

Trends in the Rare Earth Element Content of U.S.-Based Coal Combustion Fly Ashes
journal, May 2016

Enrichment of rare earth elements from coal and coal by-products by physical separations
journal, July 2017

Rare Earth Element Distribution in Fly Ash Derived from the Fire Clay Coal, Kentucky
journal, January 2017

Aqueous acid and alkaline extraction of rare earth elements from coal combustion ash
journal, July 2018

Distribution of rare earth elements in eastern Kentucky coals: Indicators of multiple modes of enrichment?
journal, April 2016

Coal deposits as promising sources of rare metals for alternative power and energy-efficient technologies
journal, April 2013

Impact of coal properties on coal combustion by-product quality: examples from a Kentucky power plant
journal, August 2004

Major and Minor Element Distribution in Fly Ash from a Coal-Fired Utility Boiler in Kentucky
journal, January 2006

A critical evaluation of the three-stage BCR sequential extraction procedure to assess the potential mobility and toxicity of heavy metals in industrially-contaminated land
journal, May 1998

Comparison of original and modified BCR sequential extraction procedures for the fractionation of copper, iron, lead, manganese and zinc in soils and sediments
journal, February 2003

Influence of trace metal distribution on its leachability from coal fly ash
journal, August 2008

Evaluation of a sequential extraction procedure for the determination of extractable trace metal contents in sediments
journal, January 1994

Coal fly ash as a resource for rare earth elements
journal, January 2015

Behavior of natural radionuclides in western coal-fired power plants
journal, April 1978

Rare earth element associations in the Kentucky State University stoker ash
journal, March 2018

Distribution and speciation of rare earth elements in coal combustion by-products via synchrotron microscopy and spectroscopy
journal, July 2018

Evaluating Rare Earth Element Availability: A Case with Revolutionary Demand from Clean Technologies
journal, February 2012

Characterization of fly ash from Kentucky power plants
journal, March 1996

Size-Dependent Variations in Fly Ash Trace Element Chemistry: Examples from a Kentucky Power Plant and with Emphasis on Rare Earth Elements
journal, December 2016

Rare earth element-bearing coals from the Russian Far East deposits
journal, June 1996

Determination of the host phase of rare earth elements in natural carbonate using X-ray absorption near-edge structure
journal, January 2009

Overview of trace element partitioning in flames and furnaces of utility coal-fired boilers
journal, August 1994

Chemistry and petrology of paired feed coal and combustion ash from anthracite-burning stoker boilers
journal, July 2017

Nano-Scale Rare Earth Distribution in Fly Ash Derived from the Combustion of the Fire Clay Coal, Kentucky
journal, March 2019