PANDA510S Macroporous Amidoxime Chelating Resin | Rare Metal Recovery Resin
PANDA510S is a professional macroporous polyhydroxamic acid (amidoxime) chelating resin developed for the recovery and enrichment of gallium, indium and germanium. With highly specific amidoxime functional groups, it provides selective adsorption performance in alkaline and weakly acidic hydrometallurgical process solutions.
The resin is designed for low-concentration rare metal recycling from complex metallurgical streams, supporting continuous enrichment, impurity separation and resource recovery in industrial hydrometallurgical systems.
Application Scope
PANDA510S is exclusively applied for the recovery of three rare scattered metals: gallium, indium and germanium. Its macroporous structure and amidoxime functional groups provide selective adsorption capability for dilute rare metal ions under suitable process conditions.
The main application scenarios include gallium extraction from alkaline Bayer liquor, indium recovery from weakly acidic leachate and germanium enrichment from metallurgical process residues.
Gallium Recovery from Bayer Liquor
Gallium recovery is the primary and most mature application of PANDA510S. The resin is optimized for extraction of dilute gallium ions from alkaline Bayer liquor in alumina production systems.
It selectively captures gallium while resisting interference from high concentrations of aluminum and alkali salt impurities. The stable adsorption kinetics and anti-fouling characteristics support long-cycle operation under large-volume circulating solution conditions.
PANDA510S helps improve gallium resource utilization by enabling continuous enrichment and preliminary purification of industrial gallium-containing solutions.
Indium Recovery from Smelting and Waste Material Solutions
Indium recovery represents another important application area of PANDA510S. The resin selectively adsorbs indium ions from weakly acidic leachate generated from zinc smelting by-products, ITO waste materials and associated rare metal ores.
By separating indium from interfering base metals, PANDA510S supports efficient enrichment of low-concentration indium resources and provides suitable feed solution for subsequent refining processes.
Germanium Enrichment
PANDA510S also provides auxiliary recovery performance for germanium from smelting tail liquids and coal ash leachate.
Although germanium concentration is generally lower than gallium and indium in industrial streams, the amidoxime functional groups enable sensitive adsorption and resource recycling of associated rare metals.
Mechanism
PANDA510S utilizes high-activity amidoxime (polyhydroxamic acid) functional groups to selectively coordinate and adsorb rare metal ions from complex process solutions.
The macroporous polymer structure provides stable diffusion channels, allowing effective adsorption kinetics while maintaining physical stability during repeated adsorption and regeneration cycles.
Its selective interaction with gallium, indium and germanium ions enables targeted enrichment from low-concentration metallurgical solutions containing high levels of interfering components.
Physicochemical Properties
PANDA510S adopts a rigid macroporous polymer matrix with high-activity amidoxime functional groups. The resin is supplied in chloride (Cl⁻) ionic form and appears as light yellow or light grey uniform spherical beads.
It features high mechanical strength, low osmotic attrition rate and stable pore structure, providing resistance against swelling and crushing during repeated regeneration cycles.
The resin maintains reliable adsorption performance in complex smelting solutions and alkaline process environments, supporting long-term industrial continuous operation.
Specifications
| Parameter | Specification |
|---|---|
| CAS Number | 9002-29-3 |
| Functional Group | Amidoxime (Polyhydroxamic Acid) |
| Matrix | Macroporous Polymer |
| Moisture Content | 60–70% |
| Mass Capacity (Cu²⁺) | ≥2.0 mmol/g |
| Bulk Density | 0.70–0.80 g/ml |
| Specific Density | 1.10–1.20 g/ml |
| Particle Size | 0.315–1.25mm ≥95% |
| Effective Particle Size | 0.6–0.9 mm |
| Osmotic Attrition Rate | ≥90% |
| Appearance | Light Yellow or Light Grey Spherical Beads |
| Shipping Ionic Form | Chloride (Cl⁻) |
| Closest International Equivalent | Purolite S910 |
Storage & Handling
Store PANDA510S in a cool, dry and ventilated environment. Avoid direct sunlight, freezing conditions and complete drying, which may cause irreversible structural damage and capacity loss.
The resin must remain moist during storage and transportation. Wet column filling is recommended to remove air bubbles and ensure uniform fluid distribution.
For industrial operation, maintain suitable solution conditions above pH 5 and follow standard adsorption and regeneration procedures to achieve stable cyclic performance and service life.
Advantages / Limitations
Advantages
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High selectivity for gallium, indium and germanium recovery.
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Strong resistance against high-content alkali metal and aluminum impurities.
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Suitable for alkaline Bayer liquor and weakly acidic metallurgical leachate.
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High adsorption capacity with stable mechanical performance.
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Cost-effective alternative to Purolite S910 for industrial rare metal recovery projects.
Limitations
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Optimal adsorption performance is achieved above pH 5.
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Performance decreases in strongly acidic environments.
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Mainly designed for rare metal enrichment and requires subsequent refining for ultra-high-purity metal production.
Summary
PANDA510S is a professional macroporous amidoxime chelating resin dedicated to gallium, indium and germanium recovery. With gallium Bayer liquor extraction as its core application and indium and germanium enrichment as supporting functions, it addresses the challenge of recovering low-concentration rare scattered metals from complex metallurgical solutions.
Featuring stable physical properties, selective adsorption capability and compatibility with imported Purolite S910 resin, PANDA510S provides a reliable solution for rare metal hydrometallurgical recovery projects.
Polyhydroxamic Acid Resin – FAQ
Q1. What is the adsorption capacity of Polyhydroxamic Acid Resin for gallium recovery from gallium-containing leaching solutions?
Polyhydroxamic Acid Resin is designed for selective recovery of metal ions that form strong complexes with hydroxamic acid functional groups, including gallium in suitable hydrometallurgical systems. The actual adsorption capacity depends on gallium concentration, solution chemistry, pH conditions, competing ions, and resin dosage. Laboratory evaluation using static adsorption tests and column breakthrough experiments is recommended to determine working capacity under specific leach conditions. Parameters such as contact time, flow rate, and regeneration efficiency should also be considered when designing a resin-based gallium recovery process.
Q2. How does functional group density affect the germanium adsorption capacity of Polyhydroxamic Acid Resin?
The density and accessibility of hydroxamic acid functional groups directly influence the number of available binding sites for germanium complexation. A higher effective functional group density may improve adsorption capacity, but resin pore structure, diffusion characteristics, and solution composition also affect practical performance. In germanium recovery applications, evaluation should include adsorption isotherms, kinetic testing, and competitive ion analysis. Polyhydroxamic Acid Resin with optimized functional group distribution can provide improved selectivity for trace metal recovery from complex hydrometallurgical solutions.
Q3. Can Polyhydroxamic Acid Resin maintain stability in acidic indium leaching solutions?
Polyhydroxamic Acid Resin can be applied in selected acidic hydrometallurgical environments, but resin stability depends on acid type, acid concentration, temperature, and the presence of oxidizing or complexing species. For indium recovery from acidic leach solutions, compatibility testing is recommended to evaluate adsorption performance, mechanical stability, and regeneration behavior. Factors including resin swelling, functional group stability, and long-term cycling performance should be considered before industrial application. Proper process conditions can help maintain resin performance during repeated adsorption and desorption cycles.
Q4. How does pH affect the chelation efficiency of Polyhydroxamic Acid Resin in germanium recovery?
Solution pH is an important factor affecting the ionization state of hydroxamic acid functional groups and the chemical form of germanium species in solution. Changes in pH may influence adsorption selectivity, adsorption kinetics, and competition from other metal ions. During germanium recovery process development, pH optimization should be performed through laboratory batch tests and dynamic column experiments. Selecting an appropriate pH range helps maximize resin utilization while maintaining effective regeneration and reducing interference from impurities present in the leaching solution.
Q5. How does Polyhydroxamic Acid Resin compare with IDA Resin for indium recovery?
Polyhydroxamic Acid Resin and IDA Resin have different functional groups and metal-binding mechanisms, resulting in different selectivity characteristics. IDA Resin is commonly used for various divalent metal ion recovery applications, while hydroxamic acid-based resins are often investigated for stronger complexation with specific metal species, including some strategic metals. The appropriate resin selection depends on indium concentration, impurity profile, solution acidity, and required product purity. Comparative testing under actual leach conditions is recommended to evaluate adsorption capacity, selectivity, regeneration efficiency, and operating cost.
Q6. What factors affect the regeneration efficiency of Polyhydroxamic Acid Resin after indium or gallium adsorption?
Regeneration efficiency of Polyhydroxamic Acid Resin depends on the target metal, adsorption strength, resin chemistry, regeneration reagent concentration, contact time, and operating temperature. Alkaline or other suitable desorption systems may be evaluated depending on the metal recovery process. Optimizing regeneration conditions helps release loaded metals while preserving resin functional groups for repeated use. In industrial applications, regeneration performance should be assessed through multiple adsorption-desorption cycles to confirm resin stability, metal recovery efficiency, and long-term process reliability.
Q7. How does iron and aluminum contamination affect Polyhydroxamic Acid Resin performance in gallium recovery systems?
Iron and aluminum are common impurities in many mineral leaching solutions and may compete with target metals for adsorption sites or affect resin selectivity. The impact depends on their concentration, chemical form, solution pH, and complexation behavior. Pretreatment steps such as filtration, oxidation control, or impurity removal may improve resin performance in complex feed solutions. For gallium recovery applications, laboratory evaluation of competitive adsorption and regeneration behavior is recommended to establish suitable operating conditions for maintaining resin selectivity.
Q8. How do flow rate and breakthrough curves influence Polyhydroxamic Acid Resin column design for gallium and germanium recovery?
Flow rate is a critical parameter in fixed-bed resin adsorption systems because it affects contact time, mass transfer efficiency, and breakthrough behavior. Lower flow rates generally provide longer interaction time between the leach solution and resin particles, while higher flow rates may reduce adsorption utilization. Breakthrough curve analysis helps determine column height, operating capacity, and regeneration intervals. For gallium and germanium recovery projects, dynamic column testing under actual solution conditions is recommended to optimize resin dosage and process performance.
Q9. How should Polyhydroxamic Acid Resin be stored to maintain activity and prevent performance loss?
Proper storage conditions are important for maintaining the adsorption performance and mechanical properties of Polyhydroxamic Acid Resin. The resin should generally be kept in a suitable moisture-preserving environment and protected from extreme temperatures, direct sunlight, and chemical contamination. Preventing excessive drying helps reduce potential changes in resin structure and swelling behavior. Before industrial use, stored resin should be conditioned according to process requirements, followed by performance verification through adsorption testing when long storage periods are involved.
Q10. How does the concentration of indium in the desorption solution affect subsequent recovery processes?
The metal concentration in the desorption solution directly influences downstream recovery processes such as precipitation, purification, or further concentration. A properly optimized desorption stage aims to achieve sufficient metal concentration while maintaining resin regeneration efficiency. For indium recovery, factors including impurity levels, solution chemistry, and the selected recovery route should be evaluated together. Integrating resin adsorption with suitable downstream treatment methods can improve overall metal recovery efficiency and support the production of higher-value strategic metal products.