Freshwater Diatomaceous Earth: A Key Filter Aid for Lithium Refining in Australia

lithium brine clarification, DLE resin protection, brine pre-treatment filter aid, freshwater diatomaceous earth, lithium recovery, lithium carbonate polishing, lithium hydroxide filtration, battery-grade lithium, industrial DE filter aid, local Australian diatomaceous earth

Introduction: Lithium Market Update

The global lithium market continues to experience significant growth, driven by the accelerating demand for electric vehicles (EVs) and energy storage systems. Lithium prices have surged over 50% in recent months, with forecasts from UBS projecting continued growth, particularly in battery-grade lithium carbonate and hydroxide.

Australia remains a major player in the lithium supply chain, producing both spodumene concentrate and hosting numerous lithium hydroxide refineries. As production scales up, filtration and brine clarification have become critical steps in both DLE operations and chemical conversion processes.

Stage 1: Brine Pre-Treatment and DLE Systems

Protecting Resins and Maximizing Lithium Recovery

In Direct Lithium Extraction (DLE) operations and brine processing, filtration is the first line of defense for resin beds. Fine suspended solids, colloidal silica, and trace organics can foul resins, reducing lithium recovery and increasing operational costs.

Freshwater diatomaceous earth (DE) offers:

  • High porosity and consistent particle size for reliable precoat and body-feed filtration
  • Chemically inert material compatible with lithium brines
  • Lower salt and heavy metal content compared with marine or imported DE
  • Improved protection of DLE resins, optimizing recovery and minimizing downtime

Key market players in Stage 1:

  • Allkem / Ganfeng JV projects – Lithium Triangle brine operations
  • Rio Tinto (Rincon project) – Large-scale lithium brine extraction
  • Eramet (Centenario-Ratones) – DLE pilot and commercial operations
  • Standard Lithium (TSXV: SLI) – Pilot projects and US DLE operations
  • DLE technology providers – Sunresin, Summit Nanotech, Controlled Thermal Resources

Stage 2: Lithium Carbonate and Hydroxide Polishing

Achieving Battery-Grade Purity

Once lithium is extracted from brine or converted from spodumene, it undergoes chemical refinement to produce battery-grade lithium hydroxide or carbonate. Filtration at this stage removes insoluble residues and trace metals, ensuring high-purity output.

Freshwater DE benefits for polishing:

  • Ensures consistent high-quality filtration for lithium hydroxide and carbonate
  • Reduces contamination from impurities often found in imported DE
  • Supports local supply chains and sustainability objectives

Key market players in Stage 2:

  • Covalent Lithium (WA Kwinana refinery) – Integrated spodumene-to-hydroxide production
  • Tianqi / IGO (Greenbushes + Kwinana refinery) – Spodumene conversion and refining
  • Pilbara Minerals / Mineral Resources – Spodumene mining and converter operations
  • Global chemical converters – China, EU, Korea refining lithium chemicals

Why Freshwater DE is Important for Lithium Processing

FeatureBenefit for Lithium Refining
Freshwater sourcedLower salts, heavy metals, and organics for improved brine and chemical processing
High porosity & uniform particle sizeEfficient precoat and body-feed filtration; optimal resin protection
Local Australian supplyReduces shipping costs, strengthens supply chain reliability, supports ESG initiatives
Chemically inertCompatible with lithium brines, hydroxide, and carbonate solutions
Flexible particle gradesSuitable for pre-treatment, DLE resin protection, and polishing applications

Market Trends and Opportunities

  • Rising lithium prices: Spot prices currently around US$11,800/t, with forecasts for further growth due to increasing EV adoption and energy storage demand.
  • Growing DLE adoption: DLE is increasingly preferred over traditional solar evaporation, with 13 operational projects producing 124,000 tpa LCE in 2024 and expectations to grow to 470,000 tpa LCE by 2035.
  • Local sourcing advantage: Australian producers are looking to reduce dependency on imported DE and improve ESG credentials by sourcing freshwater diatomaceous earth locally.

Potential adopters of freshwater DE in Australia:

  • EPCs designing DLE and lithium conversion plants
  • Process engineers and metallurgists at brine and spodumene operations
  • Lithium hydroxide and carbonate refiners
  • Pilot plants testing resin protection and brine clarification

Conclusion

Freshwater diatomaceous earth is a critical, sustainable filtration solution for lithium refining, protecting expensive resins, improving lithium recovery, and ensuring high-purity battery-grade products. With Australia’s growing lithium production and refining sector, local DE represents a reliable, high-quality alternative to imported or marine-sourced filter aids.

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