Resin-Based Fluoride and Calcium-Magnesium Removal for Lithium Battery Recycling Process Streams
With the rapid growth of the ternary lithium battery industry, the recycling and treatment of spent lithium batteries has become an important part of the battery materials supply chain.
In hydrometallurgical recycling processes, leachates from spent ternary lithium batteries may contain high levels of fluoride ions. After precipitation, impurity removal, extraction, and stripping processes, part of the fluoride may still enter nickel salt or lithium salt process streams. If not properly controlled, fluoride can create environmental risks, safety concerns, and negative effects on downstream purification, concentration, and evaporation processes.
For lithium battery recycling companies, fluoride control and calcium-magnesium removal are becoming increasingly important for improving process stability, reducing downstream equipment scaling, and supporting higher-quality product preparation.
Sunresin provides specialized resin technologies for deep fluoride removal and calcium-magnesium removal in lithium battery recycling process streams.
Challenge: Fluoride Control in Lithium Battery Recycling
In spent lithium battery recycling, fluoride-containing process streams are often complex. They may contain high salt concentration, calcium and magnesium hardness, heavy metals, and other impurities.
Conventional precipitation and coagulation processes are commonly used as pretreatment steps, but their performance is limited by solubility equilibrium. In many cases, conventional processes can only reduce fluoride to around 3–5 mg/L. When lower fluoride levels or more stable downstream process control are required, adsorption-based polishing becomes an important solution.
For deep fluoride removal, specialty fluoride removal resins can provide stronger selectivity and higher removal precision than conventional ion exchange resins.
Sunresin Zirconium-Loaded Nano Resin Technology for Fluoride Removal
Sunresin has developed a zirconium-loaded nano resin series for deep fluoride removal applications in lithium battery recycling and other complex industrial process streams.
This resin series is based on a macroporous resin structure loaded with zirconium-based active sites. It provides high selectivity for fluoride ions, while showing low interference from coexisting ions. The resin is especially suitable for sodium chloride-containing solutions and similar high-salinity water systems, where conventional ion exchange resins may show limited fluoride removal performance.
The zirconium-loaded nano resin series offers several important advantages:
- High fluoride removal selectivity
- Strong resistance to coexisting ion interference
- Stable performance in high-salinity systems
- Good resistance to heavy metal contamination
- Strong anti-fouling performance
- Stable resin structure
- High adsorption precision
- Suitable for deep fluoride removal polishing
In typical fluoride removal applications, the resin can support fluoride reduction to below 1 ppm depending on feed composition, process design, and operating conditions.
For different lithium battery recycling streams, Sunresin can select suitable resin technologies according to fluoride concentration, pH, hardness level, salt background, heavy metal content, regeneration requirements, and downstream process targets.
Application Case: Fluoride Removal from Lithium Sulfate Solution
In a spent battery recycling project, the customer needed to remove fluoride impurities from lithium sulfate solution. The process stream had an acidic condition and relatively high fluoride concentration.
After pH adjustment, the stream was treated using Sunresin zirconium-loaded nano fluoride removal resin.
Typical design and performance indicators included:
The resin-based process significantly reduced fluoride concentration and helped decrease the impact of fluoride ions on downstream processing.
For lithium battery recycling operations, this type of resin polishing step can help improve overall process reliability and reduce the risk caused by residual fluoride in lithium salt or nickel salt process streams.
Calcium and Magnesium Removal with Chelating Resin
In addition to fluoride, calcium and magnesium impurities can also create serious downstream challenges.
Calcium and magnesium may contribute to scaling in evaporation and concentration systems, increasing cleaning frequency, reducing equipment efficiency, and affecting long-term process stability.
Traditional chemical methods may use chelating agents such as EDTA to remove calcium and magnesium. However, such methods can introduce additional impurities into the process and complicate downstream purification.
Sunresin provides chelating resin technology for calcium and magnesium removal. The resin selectively adsorbs calcium and magnesium ions from the process stream, improving separation precision without introducing unnecessary chemical impurities.
In the same project, the calcium-magnesium removal section used Sunresin chelating resin after pH adjustment.
Typical design and performance indicators included:
After resin treatment, the calcium and magnesium content was greatly reduced, helping minimize their impact on downstream evaporation and concentration processes.
Why Resin Technology Creates Value
For lithium battery recycling process streams, impurity control is not only about meeting a single discharge or product requirement. It is also about improving the stability of the entire production process.
The combination of zirconium-loaded nano fluoride removal resin and chelating resin can help customers achieve:
- Reduced fluoride concentration in lithium salt process streams
- Deep calcium and magnesium removal
- Lower scaling risk in evaporators
- Reduced evaporator cleaning frequency
- Lower impact on downstream concentration and purification
- Avoidance of additional impurities from chemical chelating agents
- More stable cyclic operation
- Improved process efficiency and lower operating burden
Unlike single-use chemical treatment, resin-based impurity removal can be operated cyclically through adsorption and regeneration. This helps reduce long-term treatment cost while maintaining stable performance in each operating cycle.
Integrated Resin System Solutions
Sunresin provides not only specialty resins, but also integrated resin system solutions for lithium battery recycling and hydrometallurgical process streams.
Depending on customer requirements, Sunresin can support:
- Feed analysis
- Resin selection
- Process design
- Pilot testing
- Fixed-bed system design
- Regeneration process design
- Equipment integration
- Commissioning and technical support
For complex lithium recycling streams, resin selection must be connected with real process conditions. Fluoride level, pH, calcium-magnesium content, salt background, heavy metal impurities, regeneration strategy, and downstream process requirements all influence the final system design.
Sunresin’s application experience in adsorption and ion exchange technologies enables customers to develop more reliable impurity removal processes for battery materials recycling.
Supporting Cleaner and More Efficient Battery Recycling
As the lithium battery recycling industry continues to expand, process impurity control will play an increasingly important role in improving product quality, resource utilization, and environmental performance.
Sunresin zirconium-loaded nano fluoride removal resin and chelating resin provide effective tools for removing fluoride, calcium, and magnesium impurities from lithium battery recycling process streams.
By combining selective resin materials with engineered system solutions, Sunresin helps customers improve process stability, reduce downstream scaling risks, and support cleaner, more efficient battery recycling operations.
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