Calcination pretreatment effects on acid leaching characteristics of rare earth elements from middlings and coarse refuse material associated with a bituminous coal source

Zhang, Wencai; Honaker, Rick

doi:10.1016/j.fuel.2019.03.063

Title: Calcination pretreatment effects on acid leaching characteristics of rare earth elements from middlings and coarse refuse material associated with a bituminous coal source

Abstract

The pretreatment of middlings and coarse refuse material collected from a Pocahontas No.3 coal source using calcination was investigated for the potential of improving the leaching recovery of rare earth elements. Calcination at 600 °C significantly and preferentially improved light REE (LREE) recovery to values in the range of 80-90% using 1.2 M HCl. The positive effect was due to the increased pore diameter and volume as well as thermal decomposition of the minerals associated with the LREEs. Heavy REE recovery was not increased after calcination at 600 °C due to the need for higher temperatures for the thermal decomposition of HREE minerals. Furthermore, some HREEs were also associated with sulfide minerals (e.g., pyrite) which were transformed into low-solubility oxides (e.g., hematite) after roasting at 600 °C. Based on the leaching characteristics of the major elements (Fe, Al, Ca and Mg) and REEs along with SEM EDX data, it was concluded that REEs in the two samples mainly occurred as phosphate minerals. In the middlings, some of the minerals were completely encapsulated by kaolinite, which was less apparent in the coarse refuse. In addition, it was found that a portion of the REEs (10-25%) in the samples were associated withmore »« less

Authors:

Zhang, Wencai ^[1]; Honaker, Rick ^[1]

University of Kentucky, Lexington, KY (United States)

Publication Date:: Mon Mar 25 00:00:00 EDT 2019

Research Org.:: Marshall Miller & Associates, Inc., Bluefield, VA (United States)

Sponsoring Org.:: USDOE Office of Fossil Energy and Carbon Management (FECM); USDOE

OSTI Identifier:: 1614355

Alternate Identifier(s):: OSTI ID: 1547599

Grant/Contract Number:: FE0029956

Resource Type:: Accepted Manuscript

Journal Name:: Fuel

Additional Journal Information:: Journal Volume: 249; Journal Issue: C; Journal ID: ISSN 0016-2361

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 01 COAL, LIGNITE, AND PEAT; Energy & Fuels; Engineering; Coal; Rare earth elements; Calcination; Leaching recovery; Mineralogy

Citation Formats


                    Zhang, Wencai, and Honaker, Rick. Calcination pretreatment effects on acid leaching characteristics of rare earth elements from middlings and coarse refuse material associated with a bituminous coal source.  United States: N. p., 2019. 
Web.  doi:10.1016/j.fuel.2019.03.063.

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                    Zhang, Wencai, & Honaker, Rick. Calcination pretreatment effects on acid leaching characteristics of rare earth elements from middlings and coarse refuse material associated with a bituminous coal source.  United States.  https://doi.org/10.1016/j.fuel.2019.03.063

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                    Zhang, Wencai, and Honaker, Rick. Mon .  
"Calcination pretreatment effects on acid leaching characteristics of rare earth elements from middlings and coarse refuse material associated with a bituminous coal source".  United States.  https://doi.org/10.1016/j.fuel.2019.03.063.  https://www.osti.gov/servlets/purl/1614355.

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@article{osti_1614355,

  title        = {Calcination pretreatment effects on acid leaching characteristics of rare earth elements from middlings and coarse refuse material associated with a bituminous coal source},

  author       = {Zhang, Wencai and Honaker, Rick},

  abstractNote = {The pretreatment of middlings and coarse refuse material collected from a Pocahontas No.3 coal source using calcination was investigated for the potential of improving the leaching recovery of rare earth elements. Calcination at 600 °C significantly and preferentially improved light REE (LREE) recovery to values in the range of 80-90% using 1.2 M HCl. The positive effect was due to the increased pore diameter and volume as well as thermal decomposition of the minerals associated with the LREEs. Heavy REE recovery was not increased after calcination at 600 °C due to the need for higher temperatures for the thermal decomposition of HREE minerals. Furthermore, some HREEs were also associated with sulfide minerals (e.g., pyrite) which were transformed into low-solubility oxides (e.g., hematite) after roasting at 600 °C. Based on the leaching characteristics of the major elements (Fe, Al, Ca and Mg) and REEs along with SEM EDX data, it was concluded that REEs in the two samples mainly occurred as phosphate minerals. In the middlings, some of the minerals were completely encapsulated by kaolinite, which was less apparent in the coarse refuse. In addition, it was found that a portion of the REEs (10-25%) in the samples were associated with micro-dispersed material in the organic matrix and was released after calcination and easily recovered using 0.1M (NH4)2SO4 solution at pH 5. In conclusion, Scandium primarily occurred in mineral forms with minimum amounts associated with ion-adsorbed clays and organic association.},

  doi          = {10.1016/j.fuel.2019.03.063},

  journal      = {Fuel},

  number       = C,

  volume       = 249,

  place        = {United States},

  year         = {Mon Mar 25 00:00:00 EDT 2019},

  month        = {Mon Mar 25 00:00:00 EDT 2019}

}

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Works referenced in this record:

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

Zhang, Wencai; Yang, Xinbo; Honaker, Rick Q.
Fuel, Vol. 215
DOI: 10.1016/j.fuel.2017.11.075

Analysis, origin and significance of mineral matter in coal: An updated review
journal, August 2016

Ward, Colin R.
International Journal of Coal Geology, Vol. 165
DOI: 10.1016/j.coal.2016.07.014

Recovery of Rare Earth Elements and Yttrium from Passive-Remediation Systems of Acid Mine Drainage
journal, July 2016

Ayora, Carlos; Macías, Francisco; Torres, Ester
Environmental Science & Technology, Vol. 50, Issue 15
DOI: 10.1021/acs.est.6b02084

Melting Temperatures of Monazite and Xenotime
journal, October 1987

Hikichi, Yasuo; Nomura, Tsuyoshi
Journal of the American Ceramic Society, Vol. 70, Issue 10
DOI: 10.1111/j.1151-2916.1987.tb04890.x

Reaction process of monazite and bastnaesite mixed rare earth minerals calcined by CaO-NaCl-CaCl2
journal, August 2007

Wu, Wen-yuan; Bian, Xue; Wu, Zhi-ying
Transactions of Nonferrous Metals Society of China, Vol. 17, Issue 4
DOI: 10.1016/S1003-6326(07)60189-7

Conception of an integrated flowsheet for rare earth elements recovery from coal coarse refuse
journal, June 2018

Honaker, Rick Q.; Zhang, Wencai; Yang, Xinbo
Minerals Engineering, Vol. 122
DOI: 10.1016/j.mineng.2018.04.005

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

Lin, Ronghong; Howard, Bret H.; Roth, Elliot A.
Fuel, Vol. 200
DOI: 10.1016/j.fuel.2017.03.096

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

King, Jack F.; Taggart, Ross K.; Smith, Ryan C.
International Journal of Coal Geology, Vol. 195
DOI: 10.1016/j.coal.2018.05.009

Scandium (Sc) geochemistry in coals (Siberia, Russian Far East, Mongolia, Kazakhstan, and Iran)
journal, May 2014

Arbuzov, S. I.; Volostnov, A. V.; Mezhibor, A. M.
International Journal of Coal Geology, Vol. 125
DOI: 10.1016/j.coal.2014.01.008

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

Hower, James C.; Eble, Cortland F.; Dai, Shifeng
International Journal of Coal Geology, Vol. 160-161
DOI: 10.1016/j.coal.2016.04.009

Kinetics of Roasting Decomposition of the Rare Earth Elements by CaO and Coal
journal, June 2017

Yuan, Shuai; Yang, He; Xue, Xiang-Xin
Metals, Vol. 7, Issue 6
DOI: 10.3390/met7060213

The technology of extracting vanadium from stone coal in China: History, current status and future prospects
journal, September 2011

Zhang, Yi-Min; Bao, Shen-Xu; Liu, Tao
Hydrometallurgy, Vol. 109, Issue 1-2
DOI: 10.1016/j.hydromet.2011.06.002

Mineralogy and geochemistry of boehmite-rich coals: New insights from the Haerwusu Surface Mine, Jungar Coalfield, Inner Mongolia, China
journal, May 2008

Dai, Shifeng; Li, Dan; Chou, Chen-Lin
International Journal of Coal Geology, Vol. 74, Issue 3-4
DOI: 10.1016/j.coal.2008.01.001

Estimations of Clarkes for Carbonaceous biolithes: World averages for trace element contents in black shales and coals
journal, April 2009

Ketris, M. P.; Yudovich, Ya. E.
International Journal of Coal Geology, Vol. 78, Issue 2
DOI: 10.1016/j.coal.2009.01.002

Dynamics in the Global Market for Rare Earths
journal, October 2012

Hatch, G. P.
Elements, Vol. 8, Issue 5
DOI: 10.2113/gselements.8.5.341

Rare earth minerals in a “no tonstein” section of the Dean (Fire Clay) coal, Knox County, Kentucky
journal, June 2018

Hower, James C.; Berti, Debora; Hochella, Michael F.
International Journal of Coal Geology, Vol. 193
DOI: 10.1016/j.coal.2018.05.001

Leaching behavior of rare earth elements in Fort Union lignite coals of North America
journal, April 2018

Laudal, Daniel A.; Benson, Steven A.; Addleman, Raymond Shane
International Journal of Coal Geology, Vol. 191
DOI: 10.1016/j.coal.2018.03.010

Thermal treatment for the separation of phosphate and recovery of rare earth metals (REMs) from Korean monazite
journal, January 2015

Kumari, Archana; Panda, Rekha; Jha, Manis Kumar
Journal of Industrial and Engineering Chemistry, Vol. 21
DOI: 10.1016/j.jiec.2014.03.039

Quantification of the modes of occurrence of 42 elements in coal
journal, January 2018

Finkelman, Robert B.; Palmer, Curtis A.; Wang, Peipei
International Journal of Coal Geology, Vol. 185
DOI: 10.1016/j.coal.2017.09.005

Study on Roasting Decomposition of Mixed Rare Earth Concentrate in CaO-NaCl-CaCl2
journal, December 2006

Wenyuan, Wu; Xue, Bian; Shuchen, Sun
Journal of Rare Earths, Vol. 24, Issue 1
DOI: 10.1016/S1002-0721(07)60313-5

The analysis of ion exchange resin adsorb Li from ash solution
journal, June 2017

Nie, Xiang; Zhao, Shanshan; Li, Yanheng
World Journal of Engineering, Vol. 14, Issue 3
DOI: 10.1108/WJE-07-2016-0023

Pre-concentration of vanadium from stone coal by gravity separation
journal, June 2013

Zhao, Yunliang; Zhang, Yimin; Liu, Tao
International Journal of Mineral Processing, Vol. 121
DOI: 10.1016/j.minpro.2013.02.014

High temperature dephosphorization behavior of monazite concentrate with charred coal
journal, December 2010

Xing, Peng-fei; Zhuang, Yan-xin; Tu, Gan-feng
Transactions of Nonferrous Metals Society of China, Vol. 20, Issue 12
DOI: 10.1016/S1003-6326(10)60660-7

Thermal decomposition of pyrite
journal, October 1992

Music, S.; Popović, S.; Ristić, M.
Journal of Radioanalytical and Nuclear Chemistry Articles, Vol. 162, Issue 2
DOI: 10.1007/BF02035382

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

Seredin, Vladimir V.; Dai, Shifeng
International Journal of Coal Geology, Vol. 94
DOI: 10.1016/j.coal.2011.11.001

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

Franus, Wojciech; Wiatros-Motyka, Małgorzata M.; Wdowin, Magdalena
Environmental Science and Pollution Research, Vol. 22, Issue 12
DOI: 10.1007/s11356-015-4111-9

Effect of calcination condition on the microstructure and pozzolanic activity of calcined coal gangue
journal, January 2016

Cao, Zhao; Cao, Yongdan; Dong, Hongjuan
International Journal of Mineral Processing, Vol. 146
DOI: 10.1016/j.minpro.2015.11.008

Leaching kinetics of rare earth elements and fluoride from mixed rare earth concentrate after roasting with calcium hydroxide and sodium hydroxide
journal, November 2017

Huang, Yukun; Dou, Zhihe; Zhang, Ting-an
Hydrometallurgy, Vol. 173
DOI: 10.1016/j.hydromet.2017.07.004

Influence of NaCl-CaCl2 on Decomposing REPO4 with CaO
journal, December 2007

Shuchen, Sun; Zhiying, Wu; Xue, Bian
Journal of Rare Earths, Vol. 25, Issue 6
DOI: 10.1016/S1002-0721(08)60024-1

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

Kolker, Allan; Scott, Clint; Hower, James C.
International Journal of Coal Geology, Vol. 184
DOI: 10.1016/j.coal.2017.10.002

Chlorination kinetics of fluorine-fixed rare earth concentrate
journal, July 2003

Zhu, G.; Chi, R.; Shi, W.
Minerals Engineering, Vol. 16, Issue 7
DOI: 10.1016/S0892-6875(03)00129-8

Coal-Mining Tailings as a Pozzolanic Material in Cements Industry
journal, January 2018

Yagüe, Santiago; Sánchez, Isabel; Vigil de la Villa, Raquel
Minerals, Vol. 8, Issue 2
DOI: 10.3390/min8020046

Selective recovery of rare earth elements from aqueous solution obtained from coal power plant ash
journal, December 2016

Ponou, Josiane; Dodbiba, Gjergj; Anh, Ji-Whan
Journal of Environmental Chemical Engineering, Vol. 4, Issue 4
DOI: 10.1016/j.jece.2016.08.019

Occurrence, abundance and origin of minerals in coals and coal ashes
journal, August 1996

Vassilev, Stanislav V.; Vassileva, Christina G.
Fuel Processing Technology, Vol. 48, Issue 2
DOI: 10.1016/S0378-3820(96)01021-1

Effects of calcination temperature and the addition of ZnO on coal waste activation: A mineralogical and morphological evolution
journal, December 2017

de la Villa, Raquel Vigil; García, Rosario; Martínez-Ramírez, Sagrario
Applied Clay Science, Vol. 150
DOI: 10.1016/j.clay.2017.08.031

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

Alonso, Elisa; Sherman, Andrew M.; Wallington, Timothy J.
Environmental Science & Technology, Vol. 46, Issue 6
DOI: 10.1021/es203518d

Effect of Pre-reaction Ball Milling on Kinetics of Lanthanum Phosphate Roasting with Sodium Carbonate
journal, April 2018

Burgess, Ward A.; Keller, Murphy J.; Lekse, Jonathan W.
Industrial & Engineering Chemistry Research, Vol. 57, Issue 18
DOI: 10.1021/acs.iecr.8b00249

An overview on membrane strategies for rare earths extraction and separation
journal, May 2018

Chen, Li; Wu, Yilin; Dong, Hongjun
Separation and Purification Technology, Vol. 197
DOI: 10.1016/j.seppur.2017.12.053

Rare earth elements recovery using staged precipitation from a leachate generated from coarse coal refuse
journal, July 2018

Zhang, Wencai; Honaker, Rick Q.
International Journal of Coal Geology, Vol. 195
DOI: 10.1016/j.coal.2018.06.008

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

Zhang, Wencai; Rezaee, Mohammad; Bhagavatula, Abhijit
International Journal of Coal Preparation and Utilization, Vol. 35, Issue 6
DOI: 10.1080/19392699.2015.1033097

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

Seredin, V. V.
International Journal of Coal Geology, Vol. 30, Issue 1-2
DOI: 10.1016/0166-5162(95)00039-9

Recycling of rare earths: a critical review
journal, July 2013

Binnemans, Koen; Jones, Peter Tom; Blanpain, Bart
Journal of Cleaner Production, Vol. 51
DOI: 10.1016/j.jclepro.2012.12.037

Mechanochemical decomposition of monazite to assist the extraction of rare earth elements
journal, November 2009

Kim, Wantae; Bae, Inkook; Chae, Soochun
Journal of Alloys and Compounds, Vol. 486, Issue 1-2
DOI: 10.1016/j.jallcom.2009.07.015

Dissolution of Rare Earth Elements from Coal Fly Ash Particles in a Dilute H₂SO₄ Solvent
journal, January 2013

Kashiwakura, Shunsuke; Kumagai, Yuichi; Kubo, Hiroshi
Open Journal of Physical Chemistry, Vol. 03, Issue 02
DOI: 10.4236/ojpc.2013.32009

Study of the Dissolution Behavior of Muscovite in Stone Coal by Oxygen Pressure Acid Leaching
journal, December 2015

Xue, Nan-nan; Zhang, Yi-min; Liu, Tao
Metallurgical and Materials Transactions B, Vol. 47, Issue 1
DOI: 10.1007/s11663-015-0524-6

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Title: Calcination pretreatment effects on acid leaching characteristics of rare earth elements from middlings and coarse refuse material associated with a bituminous coal source

Abstract

Citation Formats

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

Analysis, origin and significance of mineral matter in coal: An updated review journal, August 2016

Recovery of Rare Earth Elements and Yttrium from Passive-Remediation Systems of Acid Mine Drainage journal, July 2016

Melting Temperatures of Monazite and Xenotime journal, October 1987

Reaction process of monazite and bastnaesite mixed rare earth minerals calcined by CaO-NaCl-CaCl2 journal, August 2007

Conception of an integrated flowsheet for rare earth elements recovery from coal coarse refuse journal, June 2018

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

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

Scandium (Sc) geochemistry in coals (Siberia, Russian Far East, Mongolia, Kazakhstan, and Iran) journal, May 2014

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

Kinetics of Roasting Decomposition of the Rare Earth Elements by CaO and Coal journal, June 2017

The technology of extracting vanadium from stone coal in China: History, current status and future prospects journal, September 2011

Mineralogy and geochemistry of boehmite-rich coals: New insights from the Haerwusu Surface Mine, Jungar Coalfield, Inner Mongolia, China journal, May 2008

Estimations of Clarkes for Carbonaceous biolithes: World averages for trace element contents in black shales and coals journal, April 2009

Dynamics in the Global Market for Rare Earths journal, October 2012

Rare earth minerals in a “no tonstein” section of the Dean (Fire Clay) coal, Knox County, Kentucky journal, June 2018

Leaching behavior of rare earth elements in Fort Union lignite coals of North America journal, April 2018

Thermal treatment for the separation of phosphate and recovery of rare earth metals (REMs) from Korean monazite journal, January 2015

Quantification of the modes of occurrence of 42 elements in coal journal, January 2018

Study on Roasting Decomposition of Mixed Rare Earth Concentrate in CaO-NaCl-CaCl2 journal, December 2006

The analysis of ion exchange resin adsorb Li from ash solution journal, June 2017

Pre-concentration of vanadium from stone coal by gravity separation journal, June 2013

High temperature dephosphorization behavior of monazite concentrate with charred coal journal, December 2010

Thermal decomposition of pyrite journal, October 1992

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

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

Effect of calcination condition on the microstructure and pozzolanic activity of calcined coal gangue journal, January 2016

Leaching kinetics of rare earth elements and fluoride from mixed rare earth concentrate after roasting with calcium hydroxide and sodium hydroxide journal, November 2017

Influence of NaCl-CaCl2 on Decomposing REPO4 with CaO journal, December 2007

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

Chlorination kinetics of fluorine-fixed rare earth concentrate journal, July 2003

Coal-Mining Tailings as a Pozzolanic Material in Cements Industry journal, January 2018

Selective recovery of rare earth elements from aqueous solution obtained from coal power plant ash journal, December 2016

Occurrence, abundance and origin of minerals in coals and coal ashes journal, August 1996

Effects of calcination temperature and the addition of ZnO on coal waste activation: A mineralogical and morphological evolution journal, December 2017

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

Effect of Pre-reaction Ball Milling on Kinetics of Lanthanum Phosphate Roasting with Sodium Carbonate journal, April 2018

An overview on membrane strategies for rare earths extraction and separation journal, May 2018

Rare earth elements recovery using staged precipitation from a leachate generated from coarse coal refuse journal, July 2018

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

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

Recycling of rare earths: a critical review journal, July 2013

Mechanochemical decomposition of monazite to assist the extraction of rare earth elements journal, November 2009

Dissolution of Rare Earth Elements from Coal Fly Ash Particles in a Dilute H2SO4 Solvent journal, January 2013

Study of the Dissolution Behavior of Muscovite in Stone Coal by Oxygen Pressure Acid Leaching journal, December 2015

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

Analysis, origin and significance of mineral matter in coal: An updated review
journal, August 2016

Recovery of Rare Earth Elements and Yttrium from Passive-Remediation Systems of Acid Mine Drainage
journal, July 2016

Melting Temperatures of Monazite and Xenotime
journal, October 1987

Reaction process of monazite and bastnaesite mixed rare earth minerals calcined by CaO-NaCl-CaCl2
journal, August 2007

Conception of an integrated flowsheet for rare earth elements recovery from coal coarse refuse
journal, June 2018

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

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

Scandium (Sc) geochemistry in coals (Siberia, Russian Far East, Mongolia, Kazakhstan, and Iran)
journal, May 2014

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

Kinetics of Roasting Decomposition of the Rare Earth Elements by CaO and Coal
journal, June 2017

The technology of extracting vanadium from stone coal in China: History, current status and future prospects
journal, September 2011

Mineralogy and geochemistry of boehmite-rich coals: New insights from the Haerwusu Surface Mine, Jungar Coalfield, Inner Mongolia, China
journal, May 2008

Estimations of Clarkes for Carbonaceous biolithes: World averages for trace element contents in black shales and coals
journal, April 2009

Dynamics in the Global Market for Rare Earths
journal, October 2012

Rare earth minerals in a “no tonstein” section of the Dean (Fire Clay) coal, Knox County, Kentucky
journal, June 2018

Leaching behavior of rare earth elements in Fort Union lignite coals of North America
journal, April 2018

Thermal treatment for the separation of phosphate and recovery of rare earth metals (REMs) from Korean monazite
journal, January 2015

Quantification of the modes of occurrence of 42 elements in coal
journal, January 2018

Study on Roasting Decomposition of Mixed Rare Earth Concentrate in CaO-NaCl-CaCl2
journal, December 2006

The analysis of ion exchange resin adsorb Li from ash solution
journal, June 2017

Pre-concentration of vanadium from stone coal by gravity separation
journal, June 2013

High temperature dephosphorization behavior of monazite concentrate with charred coal
journal, December 2010

Thermal decomposition of pyrite
journal, October 1992

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

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

Effect of calcination condition on the microstructure and pozzolanic activity of calcined coal gangue
journal, January 2016

Leaching kinetics of rare earth elements and fluoride from mixed rare earth concentrate after roasting with calcium hydroxide and sodium hydroxide
journal, November 2017

Influence of NaCl-CaCl2 on Decomposing REPO4 with CaO
journal, December 2007

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

Chlorination kinetics of fluorine-fixed rare earth concentrate
journal, July 2003

Coal-Mining Tailings as a Pozzolanic Material in Cements Industry
journal, January 2018

Selective recovery of rare earth elements from aqueous solution obtained from coal power plant ash
journal, December 2016

Occurrence, abundance and origin of minerals in coals and coal ashes
journal, August 1996

Effects of calcination temperature and the addition of ZnO on coal waste activation: A mineralogical and morphological evolution
journal, December 2017

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

Effect of Pre-reaction Ball Milling on Kinetics of Lanthanum Phosphate Roasting with Sodium Carbonate
journal, April 2018

An overview on membrane strategies for rare earths extraction and separation
journal, May 2018

Rare earth elements recovery using staged precipitation from a leachate generated from coarse coal refuse
journal, July 2018

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

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

Recycling of rare earths: a critical review
journal, July 2013

Mechanochemical decomposition of monazite to assist the extraction of rare earth elements
journal, November 2009

Dissolution of Rare Earth Elements from Coal Fly Ash Particles in a Dilute H₂SO₄ Solvent
journal, January 2013

Study of the Dissolution Behavior of Muscovite in Stone Coal by Oxygen Pressure Acid Leaching
journal, December 2015