REG - CleanTech Lithium - Process Test-work Progress Update

Cleantech LithiumAnnouncement

07/07/2025 07:00

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RNS Number : 8607P  CleanTech Lithium PLC  07 July 2025

7 July 2025

 

CleanTech Lithium PLC ("CleanTech Lithium" or the "Company")

Process Test-work Progress Update

 

CleanTech Lithium PLC (AIM:CTL), an innovative sustainable lithium developer
in Chile, is collaborating with DuPont Water Solutions, a business unit of
DuPont, to test lithium processing technology. DuPont has developed a new
nanofiltration (NF) membrane technology which aims to remove impurities and
maximise lithium recovery. NF is applied in CleanTech Lithium's direct lithium
extraction (DLE) downstream process. Trials have recently been completed with
highly encouraging results.

 

Test-work Highlights:

·    Test-work on lithium processing technology, a new nanofiltration (NF)
membrane technology, for high lithium recovery developed by Dupont Water
Solutions

·    The test-work focused on processing two different concentrations of
eluate produced from CleanTech Lithium´s DLE pilot plant in Chile, and
measured the key metrics of impurity removal and lithium recovery

·    The first trial was based on eluate representative of the average
produced from the Company´s DLE pilot plant, while the second trial applied
to eluate that had been concentrated approximately 4 times higher by forward
osmosis

·    The primary impurities targeted by NF are Calcium and Magnesium which
showed very high rejection rates while lithium recovery rates were 94% and
92%:

                   Trial 1 - Concentrated Eluate       Trial 2 - Concentrated Eluate
 Parameter (mg/L)  Pre-NF      Post NF     Rejection   Pre-NF      Post NF     Rejection
 Lithium           2,120       1,990       6%          8,760       8,080       8%
 Calcium           284         42          85%         1,200       180         85%
 Magnesium         225         9           96%         950         32          97%

 

 

 

 

·    The results were in line or exceeded the expected design parameters
provided by Dupont Water Solutions with performance minimally impacted by feed
concentration

·    The membranes were designed to run at a higher pressure than that
trialled which would likely increase the lithium recovery rates and reduce
reprocess volumes to recover the rejected lithium

·    The effectiveness of the NF membrane at high eluate concentrations is
positive for application of the technology at much lower feed volumes,
reducing Capex and Opex costs

 

Commenting, Ignacio Mehech, Chief Executive Officer, of Cleantech Lithium PLC,
said:

"These highly encouraging results mark an important step in our collaboration
with DuPont Water Solutions. Calcium and magnesium are among the most
difficult impurities to remove in the lithium extraction process, and DuPont's
nanofiltration technology has demonstrated excellent rejection rates while
maintaining high lithium recovery. This supports our approach to sustainable
lithium production and signals the potential for reduced capital and operating
costs as we progress towards commercialisation."

 

 

Competent Persons Statement

 

The following professional acts as qualified person, as defined in the AIM
Note for Mining, Oil and Gas Companies (June 2009) and JORC Code (2012):

 

Marcelo Bravo: Chemical Engineer (Universidad Católica del Norte), has a
Master's Degree in Engineering Sciences major in Mineral Processing,
Universidad de Antofagasta. He currently works as a Senior Process Consulting
Engineer at the Ad-Infinitum company. Mr Bravo has relevant experience in
researching and developing potassium, lithium carbonate, and solar
evapo-concentration design processes in Chile, Argentina, and Bolivia. Mr
Bravo, who has reviewed and approved the information contained in this
announcement, is registered with No. 412 in the public registry of Competent
Persons in Mining Resources and Reserves per the Law of Persons Competent and
its Regulations in force in Chile. Mr Bravo has sufficient experience relevant
to the metallurgical tests and the type of subsequent processing of the
extracted brines under consideration and to the activity being carried out to
qualify as a competent person, as defined in the JORC Code. Mr Bravo consents
to the inclusion in the press release of the matters based on his information
in the form and context in which it appears.

 

 

Further Information

 

 CleanTech Lithium PLC
 Ignacio Mehech/Gordon Stein/Nick Baxter       Jersey office: +44 (0) 1534 668 321

                                               Chile office: +562-32239222
 Beaumont Cornish Limited (Nominated Adviser)  +44 (0) 20 7628 3396

 Roland Cornish/Asia Szusciak
 Fox-Davies Capital Limited (Joint Broker)     +44 (0) 20 3884 8450

 Daniel Fox-Davies                             daniel@fox-davies.com (mailto:daniel@fox-davies.com)
 Canaccord Genuity (Joint Broker)              +44 (0) 20 7523 4680

 James Asensio

Beaumont Cornish Limited ("Beaumont Cornish") is the Company's Nominated
Adviser and is authorised and regulated by the FCA. Beaumont Cornish's
responsibilities as the Company's Nominated Adviser, including a
responsibility to advise and guide the Company on its responsibilities under
the AIM Rules for Companies and AIM Rules for Nominated Advisers, are owed
solely to the London Stock Exchange. Beaumont Cornish is not acting for and
will not be responsible to any other persons for providing protections
afforded to customers of Beaumont Cornish nor for advising them in relation to
the proposed arrangements described in this announcement or any matter
referred to in it.

 

Notes

CleanTech Lithium (AIM:CTL, Frankfurt:T2N) is an exploration and development
company advancing lithium projects in Chile for the clean energy transition.
CleanTech Lithium has two key lithium projects in Chile, Laguna Verde and
Viento Andino, and exploration stage project in Arenas Blancas (Salar de
Atacama), located in the lithium triangle, a leading centre for battery grade
lithium production.

CleanTech Lithium is committed to utilising Direct Lithium Extraction ("DLE")
with reinjection of spent brine resulting in no aquifer depletion. Direct
Lithium Extraction is a transformative technology which removes lithium from
brine with higher recoveries, short development lead times and no extensive
evaporation pond construction. For more information, please
visit: www.ctlithium.com (http://www.ctlithium.com/)

**ENDS**

 

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