Recovery of Rare Earth Elements (REEs) from Coal Ash with ... · 3/22/2017 · 2017 Rare Earth...
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3/22/20171
Recovery of Rare Earth Elements (REEs) from Coal Ash with a Closed Loop Leaching Process2017 Rare Earth Elements Portfolio Review
DE-FE-0027012
Period of Performance March 1, 2016 – August 31, 2017Principal Investigator: Rick Peterson, P.E.
Mike HeinrichsJustin Glier, Ph.D.Rachid Taha, Ph.D.Slawek Winecki, Ph.D.Kathryn JohnsonJackie Gerst
Battelle Memorial Institute505 King AvenueColumbus, OH 43201
March 22, 2017
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Project Goals and Objectives
• Validate economic viability of recovering Rare Earth Elements (REE) from coal byproducts using Battelle’s closed loop Acid Digestion Process Analyze and assess potential sources of coal byproducts as process feedstocks
Perform a techno-economic assessment based upon preliminary laboratory testing and process modeling
• Design a bench scale closed loop process for REE recovery from coal byproducts
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Presentation Outline
Project Overview
Sampling and Characterization Results
Preliminary Laboratory Testing Results
Feasibility Study Results
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Project Overview• Battelle proposed demonstration of a bench-scale
technology to economically separate, extract, and concentrate mixed REEs from coal and coal byproducts (AOI 1) Uses a closed loop acid leaching process incorporating the
Acid Digestion Process for acid recovery
Targets coal sources with >300 ppm REE by weight
Target concentration of >2% by weight for recovered REEs
• Award No. DE-FE0027012 $900,014 ($710,000 Federal;
$190,014 OCDO)
PoP = March 1, 2016 to August 31,2017
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Project Partners
• Battelle has identified project partners with the ability to support identification and procurement of high REE content coal samples The Ohio Coal Development Office includes key strategic partners such as AEP and can provide
access to coal ash samples and critical information for the economic feasibility assessment
Pennsylvania Bureau of Topographic and Geologic Survey will provide coal samples from their inventory for characterization
West Virginia Geological and Economic Survey will similarly provide coal samples from their inventory for characterization
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Source: Rare Earth Elements in Coal Deposits – a Prospectivity Analysis
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Technical Approach• Proposed technology: concentration of rare earth oxides
and recovery of leach acid • Patented Acid Digestion Process previously demonstrated
for metal leaching and acid recovery at 70 lb/hr• Synergistic with current DOE/OCDO Project for direct coal
liquefaction
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Rare earth oxides
Commercial separation and
purification processes
ConcentrationOhio coal ash- Fly Ash- Low Temperature Ash- Liquefaction Ash
Leach
Acid recovery
Makeup acid
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Sampling and Characterization Results
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Three Coal Ash Sources were Investigated
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High Temperature
Ash
ICP-MSMineralogy
ICP-MSMineralogy
Low Temperature
AshLiquefaction
Residual
ICP-MS
Densities:High, Medium,
Low
ICP-MSMineralogy
Particle Sizes: High, Medium,
Low
ICP-MSMineralogy
Coal
Sample Sources:• Pulverized Coal
Combustor (PCC) – 4 operating plants
• Fluidized Bed Combustor (FBC) – 1 plant
• Direct Coal to Liquids (CTL) – 1 pilot run
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PCC Fly Ash Tended to Have Higher REE+Y+Sc Concentrations than Bottom Ash
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REE (ppm) REE+Y+Sc (ppm) HREE+Y (ppm) LREE+Sc (ppm)
ppm
PCC Fly Ash
Plant A Fly Ash Plant B Fly Ash Plant C Fly Ash Plant D Fly Ash
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200
300
400
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REE (ppm) REE+Y+Sc (ppm) HREE+Y (ppm) LREE+Sc (ppm)
ppm
PCC Bottom Ash
Plant A Bottom Ash Plant B Bottom Ash Plant C Bottom Ash Plant D Bottom Ash
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Fluidized Bed Combustor Ash was Diluted in Calcium
Calcium Total REE
Total REE+Y+Sc
HREE+Y
LREE+Sc
HREE/LREE
Weight Percent (%) ppm ppm ppm ppm RatioFluidized Bed Combustor Fly Ash 18.1% 147.5 188.1 38.6 149.5 0.26Fluidized Bed Combustor Bottom Ash 13.7% 121.4 153.2 30.5 122.7 0.25
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The low REE concentration in FBC is diluted in Limestone used to precipitate SO2, Reduce NOx and improve the heat transfer
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Higher Temperatures Lead to Formation of Refractory Phases
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Sample Percent Crystallinity
Middle Kittanning Coal
5%
Liquefaction Residual
7%
800°C Ash 35%1200°C Ash 42%
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Battelle’s Direct Coal To Liquids (CTL) Separates Organic and Mineral Material
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Coal Liquefaction Increased TREE Concentration Over the Feed Coal on an Ash Basis
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Lu Sc Ce Dy Er Eu Gd Ho La Nd Pr Sm Tb Tm Y Yb HREE+Y LREE+Sc
CO
NC
ENTR
ATIO
N, P
PM
Feed Coal Low Density High Density >850 micron 600-850 micron 355-600 micron <350 micron
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Scandium Represents the Bulk of Material Value in the Fly Ash
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Preliminary laboratory testing
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Leaching Efficiencies Appear to Decrease at High Nitric Acid Concentrations
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ElementStarting Nitric Acid Concentration in PCC Fly Ash Leaches
17% 17% 17% 34% 51% 68% 34% (milled)
Sc 19.2% 20.8% 21.5% 21.5% N/A N/A 55.3%Y 24.6% 26.7% 28.0% 28.0% 14.9% 13.0% 46.9%La 19.0% 19.3% 20.0% 19.0% 9.9% 8.2% 35.4%Ce 21.0% 21.5% 21.7% 27.0% 11.9% 9.9% 34.0%Pr 20.3% 21.7% 22.4% 22.9% 11.6% 10.0% 36.3%Nd 20.8% 22.6% 23.4% 23.9% 12.3% 10.5% 39.5%Sm 22.5% 24.0% 25.0% 25.4% 13.7% 11.8% 40.5%Eu 22.7% 24.5% 25.4% 26.4% 14.8% 12.7% 42.4%Gd 25.0% 27.2% 28.5% 28.8% 15.7% 13.7% 45.2%Tb 23.3% 25.5% 26.9% 28.1% 15.4% 13.4% 44.3%Dy 24.1% 26.2% 27.6% 28.6% 15.5% 13.0% 41.9%Ho 24.6% 26.8% 28.0% 28.6% 15.2% 13.3% 41.8%Er 23.8% 26.2% 27.5% 27.8% 14.8% 12.6% 43.8%Tm 23.0% 25.2% 26.4% 26.9% 14.4% 12.0% 42.2%Yb 21.2% 23.1% 24.7% 24.8% 12.9% 10.6% 36.3%Lu 21.2% 22.6% 23.9% 24.3% 13.0% 10.2% 34.6%
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Serial Acid Contacts with Ash Decrease Leaching Rates
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0.00%
0.50%
1.00%
1.50%
2.00%
2.50%
3.00%
3.50%
4.00%
4.50%
5.00%
0 5 10 15 20 25 30 35
Perc
ent R
emov
al fr
om A
sh
Leach Time, minutes
Lutetium
1st Contact2nd Contact3rd Contact4th Contact
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Conceptualization of REE purification train.
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Compressive Strength Testing of Concrete Suggests Leached Ash Pozzolan Does not Adversely Affect Concrete Strength.
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Sample Description Cement (wt%)
Ash (wt%)
Sand (wt%)
Water/Cement weight ratio
Failure Pressure
AConcrete with post leached fly
ash 77 19 4 0.5 3,420 psiB Concrete with fly ash 77 19 4 0.5 3,420 psi
CConcrete without addition of fly
ash 77 0 23 0.5 3,250 psi
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Feasibility study
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Summary of Viable Coal Sources
Scenario
Revenue Requirement ($/tonne Coal
Ash Processed)
Percentage of Viable Coal Sources, Historical High
Prices
First-of-a-kind 103 25Nth-of-a-kind 62 47
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CHEMCAD Simulation Has Been Developed to Model Proposed Plant
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• Model simulates a 30 tonne/day process. Sized to reflect full capacity of a typical coal plant.
• Laboratory testing results incorporated into process model: Species leaching efficiency
Acid loading capability
NOx generation rates
Acid roasting recovery estimates
• Model results used to inform equipment sizing parameters within TEA.
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Approach to TEA follows EPRI’s TAG® method
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Installed equipment costs
E.H.O., Gen. Facilities, Contingencies
Fixed Charge Factor = Financial assumptions
Labor, utilities and feedstocks
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TEA results for FOAK and NOAK REE Recovery Plant
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Cost Component $Million per year (2015)
$/tonne Coal Ash
Processed
Annual Fixed Cost $5.4 $29Annual Variable Cost
$5.2 $28
Annualized Capital Cost
10.0 $56
By-Product Credits $(2.1) ($11)Total Annual Revenue Requirement
$19.1 $103
Cost Component $Million per year (2015)
$/tonne Coal Ash
Processed
Annual Fixed Cost $3.6 $20Annual Variable Cost
$5.2 $28
Annualized Capital Cost
4.7 $26
By-Product Credits $(2.0) ($11)Total Annual Revenue Requirement
$11.6 $62
First-of-a-Kind Plant Nth-of-a-Kind Plant
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Revenue requirement for FOAK and NOAK plants compared favorably to value present in coal ash.
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Summary of Viable Coal Sources
Scenario
Revenue Requirement ($/tonne Coal
Ash Processed)
Percentage of Viable Coal Sources, Current Prices
First-of-a-kind 103 5Nth-of-a-kind 62 20
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Next Steps
• Integrated Process Design Generation of Laboratory Test Plan
Laboratory testing to inform process design
Generation of design package for 100 lb/day system
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800.201.2011 | [email protected] | www.battelle.org
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Selection of Analytical Method for Sample Characterization
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Comparison of Sodium Peroxide vs. Lithium Borate digestion using NIST sampleSodium Peroxide digestion method gives a closer result to the NIST reference material than Lithium Borate digestion
-70%
-60%
-50%
-40%
-30%
-20%
-10%
0%
10%
20%
As Ba Be Ce Co Cr Cs Cu Dy Eu Ga La Lu Nd Ni Pb Rb Sb Sc Sm Sr Ta Tb Th U V Yb Zn
Mea
n D
ista
nce
from
NIS
T Va
lue,
%
Element
Mean Distance from NIST Value as Percentage
Sodium Peroxide Lithium Borate
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