Application of Direct Lithium Extraction across brine

Direct Lithium Extraction (DLE) is applicable to a wide range of lithium‑bearing brines, including natural saline systems and industrial process waters. Unlike evaporation‑based methods, which are limited to specific climatic and geographical conditions, DLE technologies can be adapted to diverse chemical environments and integrated into existing industrial operations. This flexibility expands the number of viable lithium resources and supports regional diversification of lithium supply.

This page outlines how DLE is applied across the main brine sources currently considered for lithium recovery: salar brines, geothermal brines, and oilfield produced waters.

Lithium recovery from salar brines

Salars are salt‑flat environments containing highly saline underground brines enriched with lithium and other dissolved minerals. These brines have historically been processed using evaporation ponds; however, chemical composition and environmental constraints increasingly favor the adoption of DLE.

• Characteristics of salar brines

Typical features include:

• High salinity and variable lithium concentrations
• Elevated magnesium and calcium levels
• Strong regional variability in chemical composition

These characteristics require extraction technologies with high lithium selectivity and robust pretreatment strategies.

• Role of DLE in salar regions

DLE can be used to:

• Complement or replace evaporation ponds
• Improve lithium recovery efficiency
• Reduce land and water requirements
• Enable extraction in areas with less favorable evaporation conditions

The ability to process brine directly and reinject treated streams makes DLE particularly suitable for salar projects facing environmental or regulatory constraints.

Lithium extraction from geothermal brines

Geothermal brines are produced during geothermal energy generation and often contain dissolved lithium along with other minerals. DLE enables lithium recovery from these brines while geothermal operations continue to generate renewable energy.

• Characteristics of geothermal brines

Key features include:

• Elevated temperature
• Presence of silica, iron, and other dissolved metals
• Continuous and predictable flow rates
• Moderate to low lithium concentrations

These conditions require materials resistant to heat and fouling, as well as effective pretreatment for silica and iron management.

• Integration of DLE with geothermal operations

DLE can be integrated downstream of geothermal power production. Treated brine is typically reinjected into the reservoir after lithium extraction, maintaining reservoir pressure and supporting closed‑loop operation.

This approach offers:

• Efficient land use through co‑location with energy facilities
• Reduced environmental footprint
• Stable, continuous lithium production aligned with base‑load energy generation

Lithium recovery from oilfield produced waters

Produced water from oil and gas operations represents an emerging lithium‑bearing resource. These waters are already managed at large scales and can contain lithium at concentrations suitable for recovery using DLE technologies.

• Characteristics of produced waters

Produced waters may contain:

• Very high total dissolved solids
• Hydrocarbons and organic compounds
• Suspended solids and scaling species

The chemical complexity of these streams necessitates comprehensive pretreatment prior to lithium extraction.

• Application of DLE in oilfield environments

With adequate pretreatment, DLE can recover lithium while integrating into existing water‑handling infrastructure. This allows operators to:

• Extract additional value from produced water streams
• Reduce waste volumes
• Avoid new resource development

DLE applications in this sector require robust system design and materials compatible with fouling‑prone and high‑salinity conditions.

Comparative overview of DLE applications

While the core extraction principles remain similar, DLE configurations vary by brine source:

• Salar brines require high selectivity for magnesium‑rich solutions
• Geothermal brines demand thermal stability and silica management
• Produced waters need advanced pretreatment to manage hydrocarbons and solids

Below a summary table for each source

Adapting extraction systems to each brine type is essential to ensure reliable performance and consistent lithium recovery.

How Lenntech supports your project

Applying Direct Lithium Extraction across diverse brine sources requires site‑specific system design, advanced pretreatment expertise, and careful integration with existing operations.

Lenntech specializes in post‑DLE treatment solutions, with a strong focus on ion‑exchange (IEX) and membrane‑based technologies, supporting the separation and conditioning of lithium from already clarified and conditioned brines.

Lenntech offers:

• Brine characterization and post‑DLE concept assessment, including laboratory testing to evaluate lithium separation and polishing requirements
• Design of post‑DLE treatment systems, including multimedia filtration (MMF), ion‑exchange, ultrafiltration (UF), electrodialysis (ED / EDR), nanofiltration (NF) or reverse osmosis (RO) where applicable
• System piloting and validation to define operating parameters and optimize combinations of membrane and IEX technologies for specific lithium‑rich brines
• Integration of IEX and membrane technologies downstream of core DLE units to improve lithium selectivity, stability, and product quality
• Modular and scalable post‑DLE treatment units, suitable for high‑salinity environments and integration into existing DLE process lines
• Water and brine management solutions, supporting recirculation, reuse, or reinjection strategies after lithium separation

Lenntech supports DLE projects by engineering, supplying, and commissioning post‑DLE treatment systems, providing solutions that complement primary lithium extraction technologies and help operators achieve consistent, efficient, and sustainable lithium recovery.

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