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Recovery of Lithium from Geothermal Brine with LithiumAluminum Layered Double Hydroxide Chloride Sorbents Mariappan Parans Paranthaman, Ling Li, Jiaqi Luo, Thomas Hoke, Huseyin Ucar, Bruce A. Moyer, and Stephen Harrison Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.7b03464 • Publication Date (Web): 27 Oct 2017 Downloaded from http://pubs.acs.org on October 28, 2017
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Environmental Science & Technology
Recovery of Lithium from Geothermal Brine with Lithium-Aluminum Layered Double Hydroxide Chloride Sorbents
1 2 3 4 5 6 7 8 9 10 11
Mariappan Parans Paranthaman1*, Ling Li1, Jiaqi Luo1, Thomas Hoke1, Huseyin Ucar1, Bruce A. Moyer1, and Stephen Harrison2** 1 2
Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA Rakehill Technologies, LLC, Benicia, CA 94510, USA
ABSTRACT
12
We report a three-stage bench-scale column extraction process to selectively extract lithium
13
chloride from geothermal brine. The goal of this research is to develop materials and processing
14
technologies to improve the economics of lithium extraction and production from naturally
15
occurring geothermal and other brines for energy storage applications. A novel sorbent, lithium
16
aluminum layered double hydroxide chloride (LDH), is synthesized and characterized with X-ray
17
powder diffraction, scanning electron microscopy, inductively coupled plasma optical emission
18
spectrometry (ICP-OES), and thermogravimetric analysis. Each cycle of the column extraction
19
process consists of three steps: 1) loading the sorbent with lithium chloride from brine; 2)
20
intermediate washing to remove unwanted ions; 3) final washing for unloading the lithium
21
chloride ions. Our experimental analysis of eluate vs. feed concentrations of Li and competing
22
ions demonstrates that our optimized sorbents can achieve a recovery efficiency of ~91% and
23
possess excellent Li apparent selectivity of 47.8 compared to Na ions and 212 compared to K
24
ions, respectively in the brine. The present work demonstrates that LDH is an effective sorbent
25
for selective extraction of lithium from brines, thus offering the possibility of effective
26
application of lithium salts in lithium-ion batteries leading to a fundamental shift in the lithium
27
supply chain.
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INTRODUCTION
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The global demand for lithium salts, the raw material for lithium-ion batteries, has increased
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significantly in recent years as a result of technological advancements in electronic devices and
32
electric cars requiring high energy-density batteries.1-3 The brine lake deposits, pegmatite
33
minerals, and clays currently provide the major resources for the near-critical element lithium.4
34
Until the late 1990’s, lithium production was dominated by industries utilizing spodumene and
35
pegmatite mineral deposits found in the United States. However, South America's brine lakes in
36
Chile and Argentina together with Australia's spodumene currently account for about 90% of
37
global lithium production estimated to be 135,000 tpa in 2016.5 Production from Australian
38
based spodumene concentrate is converted into lithium products in China. Not yet exploited,
39
geothermal brines in particular are of interest for a variety of reasons.6 First, certain geothermal
40
brines provide a source of geothermal power due to the fact that hot geothermal lakes are stored
41
at high pressure underground, which when released to atmospheric pressure, can provide a flash-
42
steam of nearly 325 °C. The flash-steam can be used to generate power. In certain geothermal
43
waters and brines, associated binary processes can be used to heat secondary high temperature
44
fluids, which can provide steam for the generation of electricity without the flashing of the
45
geothermal brine. Additionally, geothermal brines contain a variety of salts, which can be
46
recovered and utilized for high value by-products of energy production. It is known that
47
geothermal brines can include various metal ions, particularly alkali and alkaline earth metals, as
48
well as transition metals, such as manganese, zinc, in varying concentrations, depending upon
49
the source of the brine. Recovery of these metals is potentially important to the chemical,
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agricultural and pharmaceutical industries. 2 ACS Paragon Plus Environment
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As lithium has gained importance as a near-critical element for use in various energy storage
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applications,7 there are continuing efforts to develop simple and inexpensive methods for the
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recovery of lithium. For example in a typical 50 MW geothermal plant in the Salton Sea, USA,
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15,000 tons of lithium carbonate or hydroxide salts can be produced annually by recovering and
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converting of lithium chloride from the geothermal plant waste solutions.8 In addition, there are
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about 390 MW of geothermal power currently produced in the Salton Sea Known Geothermal
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Region (SSKGR), USA from the deep geothermal resource.8 This is approximately equivalent to
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120,000 tons of lithium carbonate production. Hence, the lithium salts produced from geothermal
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brine solutions will be potentially low-cost and provide a significant supply of lithium resources.
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Compared to recovering lithium from hard-rock mining, conventional recovery from brine is
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much cheaper, eco-friendly and simple, as it only involves evaporating the brine under solar heat
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to achieve the lithium product.9 However, this evaporation process has drawbacks such as low
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lithium grades, high dispersions of compositions, uncertainty of recovery rate, and a series of
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time-consuming steps.1 Various alternative methods such as ion exchange (adsorption),10-13
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hydrometallurgy,4 and solvent extraction14 have been developed to extract lithium from naturally
66
occurring brine solutions. For example, An et al.4 used a two-stage hydrometallurgy process to
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recover lithium from brine collected from Salar de Uyuni, Bolivia. On the other hand, ion
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exchange utilizing resins or sorbent materials is suitable for the recovery of lower concentrations
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of Li ions from brines. Several sorbents such as manganese oxides,10-11, 13 and layered hydrogen
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titanate, H2TiO312 have been evaluated for lithium recovery. Nevertheless, the quality of the
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current developed sorbent materials is not completely satisfactory in terms of recovery
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efficiency, Li capacity, selectivity relative to other competing bulk ions, and stability. More
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efficient sorbent materials and associated process technology for lithium extraction are therefore
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needed to be developed. Previous studies have found that lithium salts can be intercalated into
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gibbsite (γ-Al(OH)3), yielding a layered lithium aluminum double hydroxide chloride (LDH).15-16
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LDH crystallizes in hexagonal symmetry with a space group P63/mcm at room temperature. X-
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ray and neutron powder diffraction patterns have revealed that the structure of the LDHs consists
78
of [LiAl2(OH)6]+ layers separated by water molecules and hydroxide ions.17 In fact, LDHs have
79
captured attention for a while owing to a variety of applications in catalyst, drug delivery agents,
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adsorbents, and ion scavenging.16,
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characterization of the lithium aluminum double hydroxide chloride ((nominal composition
82
LiCl.mAl(OH)3.nH2O) with varying Li:Al ratios), and evaluate the efficiency and Li selectivity
83
of these sorbents for lithium recovery from geothermal brine in column experiments.
18-23
In this study, we focus on the synthesis and
84 85
EXPERIMENTAL METHODS
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Sorbent synthesis
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Lithium aluminum layered double hydroxide chlorides (LDHs), LiCl.mAl(OH)3.nH2O with Li:Al
88
molar ratio of 1:3 have been synthesized as follows.24 Lithium hydroxide (LiOH.H2O, Alfa
89
Aesar, 99.9% pure) and aluminum hydroxide (gibbsite Al(OH)3, Strem Chemicals, 99% pure)
90
were used as the starting materials. LiOH.H2O and Al(OH)3 were mixed in a stainless steel
91
container with approximately 75 wt.% of de-ionized (DI) water. The mixture was stirred for 48 h
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in an oil bath held in individual preparations at 18 °C, 21 °C, 30 °C, 40 °C, and 90 °C.
93
Additional DI water was added to the mixture to prevent the samples from drying out. Equivalent
94
mole ratios of HCl to initial LiOH.H2O were slowly added to the gel-like samples drop by drop
95
with stirring to replace the OH– with Cl– ions associated with Li+. The pH of the solution was
96
always kept above 5.5. After the ion exchange step, the mixture was stirred for 1–2 h to allow for
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a complete reaction. The mixture was then washed with DI water and vacuum filtered overnight.
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The resultant filtrate had a pH of 6. Finally, the sample was ground into granulated form with
99
average particle size of 150 µm for lithium extraction. After identifying the optimal synthesis
100
temperature of 90 °C, we also synthesized LDH with varied Li:Al molar ratios of 1:1.25; 1:1.5;
101
and 1:2 to optimize the composition and achieve a single LDH phase.
102 103
Bench scale column extraction setup
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A schematic picture of the column is shown in Figure 1. Three solutions namely the initial brine,
105
intermediate washing, and final strip solutions are loaded into the column successively. The
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brine typically contains various salts including LiCl, NaCl, KCl, CaCl2, etc. (more details of the
107
brine compositions are provided in Table 1 and also in reference (2)). The wash solution contains
108
mainly NaCl with a small amount of LiCl to remove any unwanted ions trapped in the sorbents,
109
while the strip solution contains a low concentration of purely LiCl. The system is controlled by
110
a computer automatically through two pinch valves, and is constantly kept at 95 °C. The eluate
111
solutions are collected manually for each bed volume (BV). One bed volume is defined as BV =
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Lπr2 (BV = Bed Volume, L = Bed length of the column in cm, and r = radius of the column = 0.5
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cm). In the experiments, the column radius was 0.5 cm, with a bed height of 13 cm, with a
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starting mass of LDH (Li:Al = 1:1.25) of 8 g. Flow rates were adjusted to 1.33 mL/min for load.
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Typically, the flow rates for brine solutions are 8 BV/h followed by 8 BV/h for wash and 2 BV/h
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for strip solutions.
117
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Figure 1. Schematic of the bench scale column extraction setup.
120 121
Characterization
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Phase formation of all sorbents was investigated by X-ray powder diffraction (XRD) with a
123
PANalytical X`Pert Powder diffractometer with CuKα1 radiation (λ = 1.54059 Å). The feed and
124
eluate solutions as well as the sorbents were analyzed by inductively coupled plasma optical
125
emission spectroscopy (ICP-OES) at Simbol Materials, Inc. to obtain the elemental
126
concentrations. A scanning electron microscopy (SEM) fitted with an energy dispersive
127
spectrometer (Merlin ZEISS XG-3262) was used to investigate the microstructure of the
128
sorbents. Thermogravimetric analysis (TGA) were performed from room temperature up to 800
129
°C with a heating rate of 5 °C /min under flowing dry air to determine the water percentage
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present in each sorbent.
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RESULTS AND DISCUSSION
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Optimizing the reaction temperature
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Figure 2 shows the XRD patterns of the LDH sorbents with nominal Li:Al = 1:3 synthesized at
136
various temperatures. Almost all peaks in each pattern can be indexed with a hexagonal
137
P63/mcm model. The data indicates a nearly single phase of layered LDH with a very small
138
amount of unreacted gibbsite γ-Al(OH)3. Furthermore, sharper peaks can be clearly observed for
139
the 90 °C sample compared to those for samples synthesized at lower temperatures, which
140
indicate that the 90 °C sorbent is of best crystallinity. This can be readily explained, from the
141
previous study of time-resolved in-situ X-ray diffraction experiments involving LiCl and
142
gibbsite.16 The temperature dependence of the intercalation reaction data of LiCl and Gibbsite
143
was fitted into Avrami-Erofe’s ev equation. By assuming Avrami-Erofe’ev kinetics, a two
144
dimensional diffusion-controlled growth model following instantaneous nucleation was
145
proposed. Hence, Avrami-Erofe’ev equation becomes
146 147
α = 1 - exp(-kt)
(1)
148 149
The validity of this equation for the whole process was confirmed by a Sharp-Hancock analysis
150
and the plot of ln k versus 1/T yielded Ea, activation energy of 27 kJ mol-1.16 This value is in
151
agreement with the activation energy for lithium intercalation in TiS2 giving Li0.2TiS2. Hence, a
152
highly crystalline sample is expected to be superior in that the well-defined layered structure
153
would allow for more efficient insertion/extraction of the LiCl ions.
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*
Unreacted Gibbsite
90 °C
* *
Intensity (arb.u)
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40 °C
* * *
30 °C 21 °C 18 °C LDH Gibbsite Al(OH)3
10
20
30
40
50
60
70
80
90
2 theta (degrees)
154 155 156 157
Figure 2. XRD patterns of LDHs with nominal Li:Al molar ratio of 1:3 synthesized at 18 °C, 21 °C, 30 °C, 40 °C, and 90 °C. The SEM images in Figure 3 show that the morphology of the LDHs with Li:Al = 1:3
158
changes with temperature as synthesized at 18 °C, 30 °C, 40 °C, and 90 °C. The magnifications
159
for all the images are 100 kX. It can be observed that the sorbents synthesized at 18 °C, 30 °C,
160
and 40 °C have a needle/rose petal like morphology, whereas the morphology of the 90 °C
161
sorbent is transformed to flat and platelet. A platelet morphology could likely enhance the
162
lithium adsorption efficiency since it results in a higher surface area.25 Sorbents were not pre-
163
treated before ICP-OES analysis. To better evaluate the stoichiometry of the sorbent, we
164
dissolved the sorbents with nominal Li:Al = 1:3 synthesized at various temperatures in 5% nitric
165
acid solution, and determined the chemical composition via ICP-OES. As shown in Table S1, the
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actual value of Li:Al ratio is very close to 1:3 irrespective of the synthesis temperatures.
167
Furthermore, TGA was employed to determine chemical composition of the sorbents. Figure 4
168
shows a total weight loss of 44% for the Li:Al = 1:3 sample as a function of temperature. The
169
weight loss is mainly due to water evaporation during heating, from which the H2O content is
170
estimated to be 0.7 moles. Similar weight loss was observed for other LDH compositions as well. 8 ACS Paragon Plus Environment
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To prepare single phase LDH sorbent and eliminate unwanted gibbsite impurities, we
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synthesized the LDHs with varying Li:Al ratios. Figure 5 shows the XRD patterns of LDHs with
173
nominal Li:Al ratios of 1:3, 1:2, 1:1.5, and 1:1.25 synthesized at 90 °C. The nominal Li:Al = 1:3
174
sample had a small amount of unreacted gibbsite Al(OH)3 as indicated by the extra peak marked
175
by a star in Figure 5 and also in Figure 2, and the rest of the sorbents are single phase Li-Al
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LDH. We also determined the chemical composition via ICP-OES of these sorbents, and the
177
results were reported in Table S2. We used single-phase nominal Li:Al = 1:1.25 sample
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nominally LiCl.1.25Al(OH)3.mH2O as the sorbent for the bench-scale column evaluation run.
179
Note that the sorbents pre-treated by reacting with water at 95 °C to strip part of LiCl and make
180
the LDH sorbents deficient with cation vacancies suitable for LiCl intercalation before the
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column evaluation runs.
182 183 184 185
Figure 3. SEM images showing the morphology of LDHs with nominal Li:Al ratio of 1:3 synthesized at 18 °C, 30 °C, 40 °C, and 90 °C.
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105 100 95
Al/Li = 3:1
90
Weight (%)
85 80 75 70 65
weight loss
60 55 50 0
100
200
300
400
500
600
700
800
900
o
Temperature ( C)
187 188 189 190
Figure 4. TGA data of LDH with nominal Li:Al ratio of 1:3 synthesized at 90 °C.
Intensity (arb.u)
*
Unreacted Gibbsite
Li:Al = 1:1.25 Li:Al = 1:1.5 Li:Al = 1:2
*
Li:Al = 1:3 LDH Gibbsite Al(OH)3
10
20
30
40
50
60
70
80
90
2 theta (degrees)
191 192 193
Figure 5. XRD patterns of LDHs with nominal Li:Al ratio of 1:3, 1:2, 1:1.5, and 1:1.25 synthesized at 90 °C. 10 ACS Paragon Plus Environment
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194 195 196
Bench scale column extraction
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6 shows the metal-ion concentrations for different cations in both the eluate and feed solutions in
198
the course of the experiment. As discussed above, the sorbent had been synthesized through LiCl
199
intercalation into the hexagonal layers of gibbsite, Al(OH)3 as shown in the equation below:
200
Column experiments demonstrated the recovery of LiCl from simulated geothermal brine. Figure
LiOH + HCl + 3 Al(OH)3 + 0.7H2O
LiCl.3Al(OH)3.0.7H2O
(2)
201
While the three solutions are passing through the column, the sorbent composition changes
202
dynamically with LiCl ions coming in and out of the layered LDH structure. When brine is
203
loaded into the column, LiCl intercalates into the sorbent.
204
x LiCl(brine) + (1-x) LiCl.3Al(OH)3.0.7H2O ≈ LiCl.3Al(OH)3.0.7H2O
(3)
205
The washing step employs an aqueous intermediate washing solution to wash away unwanted
206
salts, particularly KCl, CaCl2, MgCl2 and B residing in the inter-particle volume of the sorbent
207
after initial loading of the brine step without removing lithium intercalated in the sorbent.
208
Finally, the strip eluent, which contains a small concentration of LiCl in aqueous solution,
209
simply reverses the LiCl uptake owing to the now drastically reduced chloride concentration in
210
the aqueous phase. The process cycle thus operates by chloride "swing". Compared with ion
211
exchange, chloride swing obviates the consumption of chemical reagents, such as HCl for
212
stripping, that would otherwise add cost and secondary waste issues.
213
Although the loading-elution cycle was not optimized, the concentration profiles shown in
214
Figure 6 show the uptake and elution of LiCl. It can be seen from Fig. 6(b) that while loading the
215
brine, the Li output concentration in the eluate solution decreases down to ~31 mg/L until Bed
216
Volume, BV6, and gradually breaks through at 360 mg/L at BV9 when the capacity saturation of
217
the sorbent is reached. Stripping was effected with 250 mg/L LiCl rather than pure water,
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because over-depletion of LiCl from the sorbent material causes irreversible degradation of the
219
LDH presumably back to gibbsite (as shown in Figure S1). We evaluated the sorbents through
220
X-ray powder diffraction analysis after each cycle of passing the water strip solutions containing
221
various concentrations of LiCl (0; 125; 250; 500 mg/L) through the column to determine the
222
stability of sorbents. Strip solutions containing 0 and 125 mg/L LiCl caused the degradation of
223
the LDH phase revealed by the formation of extra Gibbsite Al(OH)3 phase in the XRD patterns.
224
However, LDH phase is retained through the strip solution containing 250 and 500 mg/L.
225
Typical XRD patterns of LDH sorbents loaded with brine is shown in Figure S2. It may be seen
226
that on stripping the Li output concentration increases to a peak concentration of 2.3 g/L between
227
BV11 to BV13 as the Li ions temporarily stored in the sorbent diffuse into the low-chloride
228
aqueous stream. It should be noted that the Li ions present in the strip solution would also
229
contribute somewhat to this large increase. We have taken that into account for calculating the
230
separation factor for Li over other metal ions.
232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251
4
10
3
10
2
10
Li out Na out Ca out
1
10
4
2500
6
8
K out B out Mn out 10
12
14
2000 L i o ut (mg/ L)
231
Metal ion concen tr ati ons (mg /L)
218
1500
Li out Li in Li adsorbed
1000 500 0 Lo ad 2
4
Wash
6 8 10 12 Bed Vol ume (coun ts)
Strip 14
16
Figure 6. The metal-ion concentrations of the feed (in) and eluate (out) solutions as a function of bed volume. 12 ACS Paragon Plus Environment
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The recovery of Li in the loading step approached 91% in our run without optimization. Li
253
recovery efficiency was calculated from the ratio of total Li mass in the strip compared to the
254
total Li mass present in the brine solution. It is a fact that, since the sorbent material must retain a
255
certain amount of LiCl to maintain structural integrity, the eluent will always contain a small
256
level of Li at the minimum. We are currently addressing the question of the optimization of the
257
load-wash-strip cycle conditions as well as minimization of the LiCl concentration in the strip
258
solution to maintain the integrity of the sorbent. Selectivity is also very good for purposes of
259
treating geothermal brine. As shown in Table 1, the Li concentration at the peak strip
260
concentration at BV13 was much higher than that of any of the competing metals. Assuming a
261
fraction is collected at the peak concentration, the grade of LiCl would be excellent in relation to
262
its small concentration relative to the competing ions. Defining the separation factor for lithium
263
over another metal M as SFLi/M = ([Li]strip/[Li]brine)/ ([M]strip/[M]brine), where [Li]strip and [Li]brine
264
denotes the lithium concentration in the strip and brine solutions, respectively, where [M]strip and
265
[M]brine denotes the other metal cation concentrations in the strip and brine solutions, very
266
promising values are obtained, especially for sodium at SF = 34.3 (at BV=13), where BV = Bed
267
Volume; and for potassium at SF = 146.2 (at BV=13). Taking the combined bed volumes of
268
BV13-16, the separation factors improve because of the rapid decrease of concentrations of
269
competing ions. Possible tailing of the lithium concentration at BV16 is evident on stripping, and
270
we will pursue this question in future efforts. Efforts are also being made to modify the LDH
271
sorbent compositions or develop alternate extraction methods to improve Li selectivity and
272
capacity and also remove Na and K efficiently from the eluate solution so that high purity battery
273
grade lithium carbonate products can be successfully developed.
274
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CONCLUSION
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A series of LDH sorbent materials with optimum process conditions have been prepared and
277
examined for potential use in lithium sorption from geothermal brine using a chloride
278
concentration swing principle. A Li recovery efficiency of ~91% and a high Li selectivity of 47.8
279
compared to Na ions and 212 compared to K ions from the brine have been achieved. Column
280
results, though not optimized for process purposes, indicate the potential for excellent recovery
281
with rejection of major competing ions, including Na, K, Ca, Mn, and B. Owing to the sorbent’s
282
low cost, ease of preparation, environmentally friendly nature, and straightforward load-wash-
283
elution behavior without consumption of reagent chemicals nor secondary waste, the LDH
284
sorbent seems promising for treating geothermal brine and for creating a new supply of lithium
285
capable of meeting a significant fraction of the future growth in lithium demand for energy
286
storage applications.
287 288 289 290
291 292 293
Table 1. Metal-ion concentrations and separation factors in a typical load wash strip run in a column experiment.
Metal Li
Conc. in brine (mg/L) 360
Conc. @ BV13 (mg/L) 2340
SFLi/M @ BV13*
Conc.@ BV13-16 (mg/L) 5079
Average conc. @ BV 13-16 1269.8
SFLi/M @ BV13-16*
Na
44000
7470
34.3
10474
2618.5
47.8
K
16500
657
146.2
886
221.5
212.0
Ca
30400
1660
106.6
2410
602.5
143.6
Mn
1420
199
41.5
361
90.25
44.8
B
390
19.5
116.4
35
8.75
126.9
*Contribution from the Li ions present in the strip solution was taken into account while determining the separation factor, SFLi/M = ([Li]strip/[Li]brine)/ ([M]strip/[M]brine). 14 ACS Paragon Plus Environment
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ASSOCIATED CONTENT
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Supporting Information
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Tables S1 and S2, Figures S1 and S2. The supporting information is available free of charge on
298
the ACS Publications website.
299
Keywords
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Li extraction; brine solution; LDH sorbents, synthesis, bench scale extraction
301
AUTHOR INFORMATION
302
Corresponding Author
303
∗
304
**Present address: Alger Alternative Energy, LLC formerly with Simbol Materials (Stephen
305
Harrison).
306
Notes
307
The authors declare no competing financial interest.
308
ACKNOWLEDGEMENTS
309
This work was supported by the Critical Materials Institute, an Energy Innovation Hub funded
310
by the U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy,
311
Advanced Manufacturing Office. The research on the synthesis of sorbents (JL, TH) was
312
supported by the U.S. Department of Energy, Office of Science, Office of Workforce
313
Development for Teachers and Scientists (WDTS) under the Science Undergraduate Laboratory
314
Internship program. Thanks are due to Fred Sloop and Daejin Kim (ORNL) for ICP analysis.
Phone (865) 574-5045; e-mail:
[email protected] (M. P. Paranthaman).
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Additional information
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This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-
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00OR22725 with the U.S. Department of Energy. The United States Government retains and the
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publisher, by accepting the article for publication, acknowledges that the United States
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Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or
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reproduce the published form of this manuscript, or allow others to do so, for United States
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Government purposes. The Department of Energy will provide public access to these results of
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federally
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(http://energy.gov/downloads/doe-public-access-plan).
sponsored
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This is a schematic representation of the recovery of Li from the used geothermal brine that is coming out of a geothermal power plant and the application of extracted lithium salts for producing lithium-ion batteries.
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