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Title: Acid digestion processes for recovery of rare earth elements from coal and coal byproducts

Abstract

A system for recovering rare earth elements from coal ash includes a leaching reactor, an ash dryer downstream of the leaching reactor, and a roaster downstream of the ash dryer that is cooperatively connected to both the leaching reactor and the ash dryer. Coal ash is mixed with an acid stream such that rare earth elements present in the coal ash are dissolved in the acid stream, thereby creating (i) a leachate containing the rare earth elements and (ii) leached ash. The leachate is heated to obtain acid vapor and an acid-soluble rare earth concentrate. Mixing of the coal ash with the acid stream can occur in a leaching reactor and heating of the leachate can occur in a roaster. The acid-soluble rare earth concentrate can be fed to a hydrometallurgical process to separate and purify the rare earth elements.

Inventors:
; ; ; ; ;
Issue Date:
Research Org.:
Battelle Memorial Inst., Columbus, OH (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1650792
Patent Number(s):
10626482
Application Number:
15/617,589
Assignee:
Battelle Memorial Institute (Columbus, OH)
Patent Classifications (CPCs):
C - CHEMISTRY C22 - METALLURGY C22B - PRODUCTION AND REFINING OF METALS
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
DOE Contract Number:  
FE0027012
Resource Type:
Patent
Resource Relation:
Patent File Date: 06/08/2017
Country of Publication:
United States
Language:
English

Citation Formats

Peterson, Rick, Heinrichs, Michael, Gadkari, Vinay V., Taha, Rachid, Winecki, Slawomir, and Argumedo, Darwin. Acid digestion processes for recovery of rare earth elements from coal and coal byproducts. United States: N. p., 2020. Web.
Peterson, Rick, Heinrichs, Michael, Gadkari, Vinay V., Taha, Rachid, Winecki, Slawomir, & Argumedo, Darwin. Acid digestion processes for recovery of rare earth elements from coal and coal byproducts. United States.
Peterson, Rick, Heinrichs, Michael, Gadkari, Vinay V., Taha, Rachid, Winecki, Slawomir, and Argumedo, Darwin. Tue . "Acid digestion processes for recovery of rare earth elements from coal and coal byproducts". United States. https://www.osti.gov/servlets/purl/1650792.
@article{osti_1650792,
title = {Acid digestion processes for recovery of rare earth elements from coal and coal byproducts},
author = {Peterson, Rick and Heinrichs, Michael and Gadkari, Vinay V. and Taha, Rachid and Winecki, Slawomir and Argumedo, Darwin},
abstractNote = {A system for recovering rare earth elements from coal ash includes a leaching reactor, an ash dryer downstream of the leaching reactor, and a roaster downstream of the ash dryer that is cooperatively connected to both the leaching reactor and the ash dryer. Coal ash is mixed with an acid stream such that rare earth elements present in the coal ash are dissolved in the acid stream, thereby creating (i) a leachate containing the rare earth elements and (ii) leached ash. The leachate is heated to obtain acid vapor and an acid-soluble rare earth concentrate. Mixing of the coal ash with the acid stream can occur in a leaching reactor and heating of the leachate can occur in a roaster. The acid-soluble rare earth concentrate can be fed to a hydrometallurgical process to separate and purify the rare earth elements.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {4}
}

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Works referenced in this record:

Recovery of rare earth elements and compounds from coal ash
patent, March 2015


Recovery and recycle of molybdenum values from coal liquefaction residue
patent, February 1983


Process for recovering rare metals from the combustion residue of coal by digestion
patent, March 1987


Munitions treatment by acid digestion
patent, January 2000


Recovery of rare earth elements and compounds from coal ash
patent, July 2016