PANDA517S Macroporous Thiouronium Chelating Resin | Precious & PGM Metal Recovery

PANDA517S is a professional macroporous polystyrene thiouronium (thiosemicarbazide) chelating resin engineered for precious metal and platinum group metal (PGM) separation and recovery. Its sulfur-containing functional groups provide highly selective adsorption performance for noble metal ions while reducing interference from base metal impurities.

Designed for gold and platinum group metal hydrometallurgical applications, PANDA517S supports selective enrichment, impurity removal and resource recovery from complex leachate and secondary resource solutions.

Application Scope

PANDA517S is specifically applied for two targeted mineral categories: gold and platinum group metals. The resin combines selective metal adsorption capability with stable physical performance for high-value precious metal refining systems.

Its specialized thiouronium functional structure provides strong affinity toward noble metal ions, enabling effective separation from solutions containing large amounts of interfering base metals.

Gold Recovery

Gold recovery is the primary and most mature application of PANDA517S. The thiouronium functional structure provides strong binding affinity for gold ions in acidic and neutral leachate systems.

The resin is used for gold adsorption and enrichment from heap leaching solutions, cyanide-free gold extraction liquids and smelting tail water. It selectively captures gold while reducing adsorption interference from common base metal ions.

With a stable macroporous structure, PANDA517S supports large-flow and continuous mining production conditions, helping improve gold resource recovery efficiency and reduce operational challenges in precious metal processing.

Platinum Group Metal (PGM) Recovery

Platinum group metal recovery is the secondary application field of PANDA517S. In complex PGM-associated ore leachate and secondary resource recycling solutions, the resin selectively captures platinum, palladium and other platinum group metal ions.

By separating valuable PGMs from impurity metals, PANDA517S supports preliminary enrichment and purification of scattered platinum group resources for further refining processes.

Mechanism

PANDA517S utilizes thiouronium (thiosemicarbazide) functional groups to selectively coordinate with precious metal ions through sulfur-containing chemical interactions.

The macroporous polystyrene matrix provides stable internal diffusion channels, allowing efficient ion transfer and maintaining adsorption performance during repeated regeneration cycles.

Its selective affinity enables targeted enrichment of gold and platinum group metals from complex hydrometallurgical solutions containing competing impurity ions.

Physicochemical Properties

PANDA517S adopts a high-stability macroporous polystyrene matrix with modified thiouronium functional groups. Supplied in chloride (Cl) ionic form, it features uniform spherical particles with excellent osmotic wear resistance.

The resin provides stable density parameters, fast ion exchange kinetics and high-volume adsorption capacity. It maintains precious metal selectivity within pH 6–12 and supports long-term cyclic regeneration under industrial hydrometallurgical conditions.

Specifications

Parameter	Specification
CAS Number	63182-08-1
Functional Group	Thiouronium / Aminothiourea
Volume Exchange Capacity (Hg²⁺)	≥1.0 mmol/ml
Water Retention	52–60%
Bulk Density	0.65–0.77 g/ml
Specific Density	1.03–1.10 g/ml
Particle Size	0.4–1.25mm ≥95%
Osmotic-Attrited Spherical Ratio	≥90%
Ionic Form Supplied	Chloride (Cl)
Max Operating Temperature	80℃
pH Operating Range	6–12
International Equivalents	Amberlite SIR-400, Lewatit TP214

Storage & Handling

Store PANDA517S in a cool, dry and ventilated warehouse. Avoid freezing, excessive heat and long-term direct sunlight to prevent structural damage and capacity reduction.

Keep the resin moist during storage and transportation. For industrial regeneration, use 10–12 mol/L HCl solution with a resin-to-solvent volume ratio of 1:2–1:3 to achieve effective elution and complete regeneration.

All production operations should be maintained within the recommended pH and temperature range to preserve precious metal selectivity and service life.

Advantages / Limitations

Advantages

• High selective adsorption performance for gold and platinum group metals.

• Strong resistance against base metal interference.

• Suitable for precious metal enrichment from complex hydrometallurgical solutions.

• Stable mechanical strength and long-cycle regeneration capability.

• Cost-effective alternative to imported Amberlite SIR-400 and Lewatit TP214 resins.

Limitations

• Optimal adsorption performance is achieved within pH 6–12.

• Performance decreases significantly in strong acid conditions.

• Requires high-concentration hydrochloric acid regeneration with standardized operation procedures.

Summary

PANDA517S is a dedicated macroporous thiouronium chelating resin developed for gold and platinum group metal hydrometallurgy. With gold enrichment as the primary application and PGM recovery as a supporting function, it provides selective separation of valuable noble metals from complex process solutions.

Featuring stable physicochemical properties, strong metal affinity and compatibility with mainstream imported resins, PANDA517S provides a reliable solution for high-value precious metal refining and resource recovery projects.

Thiourea / Aminothiourea Resin for Gold and Platinum Group Metals Recovery – FAQ

Q1. What is the adsorption capacity of Thiourea Resin for platinum recovery from PGM leaching solutions?

Thiourea Resin is designed for selective adsorption of precious metal ions and complexes through sulfur-containing functional groups. The practical platinum adsorption capacity depends on factors including platinum concentration, solution chemistry, oxidation state, pH conditions, competing metals, and resin structure. Laboratory batch adsorption tests and dynamic column experiments are commonly used to evaluate working capacity and breakthrough behavior. For PGM recovery applications, resin selection should consider not only adsorption capacity but also selectivity, regeneration efficiency, and stability during repeated adsorption-desorption cycles.

Q2. How does Aminothiourea Resin improve palladium selectivity compared with conventional adsorption resins?

Aminothiourea Resin provides sulfur- and nitrogen-containing functional groups that can form selective interactions with precious metal species, particularly platinum group metals such as palladium. Compared with general adsorption materials, its selectivity depends on functional group chemistry, resin matrix structure, and the composition of the leaching solution. The actual improvement in palladium selectivity should be evaluated through comparative adsorption tests under specific process conditions. Factors such as competing copper, nickel, iron, and other dissolved metals should be considered when designing a PGM recovery process.

Q3. Can Thiourea Resin maintain performance in acidic gold and PGM leaching solutions?

Thiourea Resin can be applied in selected acidic hydrometallurgical environments, but long-term stability depends on acid type, acid concentration, temperature, oxidizing conditions, and exposure time. In gold and PGM recovery systems, compatibility testing is recommended to evaluate adsorption performance, mechanical stability, and regeneration behavior under actual leach conditions. Proper control of solution chemistry helps maintain resin activity and reduce potential degradation of sulfur-containing functional groups during continuous operation.

Q4. How do pH conditions affect the adsorption performance of Thiourea Resin in precious metal recovery?

Solution pH plays an important role in determining metal complex formation, resin functional group activity, and adsorption selectivity. In gold and PGM leaching systems, changes in pH may influence the chemical form of target metal complexes and the interaction between these species and thiourea-based functional groups. Optimizing pH through laboratory testing helps identify suitable operating conditions for adsorption capacity, impurity control, and regeneration efficiency. Dynamic column testing is recommended for confirming performance in continuous recovery applications.

Q5. How does functional group density influence gold adsorption capacity of Thiourea Resin?

The density and accessibility of thiourea functional groups directly affect the number of available adsorption sites for gold complexes. Higher effective functional group availability may improve adsorption capacity, but practical performance also depends on resin pore structure, diffusion characteristics, solution composition, and competing ions. Evaluation through adsorption isotherms, kinetic studies, and column experiments provides a more accurate understanding of resin performance. Optimized functional group distribution can support efficient gold recovery while maintaining suitable regeneration characteristics.

Q6. How does Thiourea Resin compare with activated carbon in gold and PGM recovery processes?

Thiourea Resin and activated carbon operate through different adsorption mechanisms and have different application advantages. Activated carbon is widely used in gold recovery due to its strong adsorption capability for certain gold complexes, while thiourea-based resin provides specific functional groups designed for selective precious metal recovery. The appropriate technology depends on feed solution characteristics, target metal concentration, impurity levels, and required product purity. In some process designs, resin adsorption can complement existing recovery technologies rather than directly replace activated carbon.

Q7. What factors affect the regeneration efficiency of Thiourea Resin after gold or PGM adsorption?

Regeneration efficiency of Thiourea Resin depends on metal loading level, adsorption strength, desorption reagent composition, reagent concentration, contact time, and resin condition after operation. Acidic or other suitable regeneration systems may be evaluated depending on the target metal and process chemistry. Multiple adsorption-desorption cycle tests are recommended to verify capacity retention, functional group stability, and long-term operating performance. Proper regeneration optimization helps improve resin utilization and supports continuous precious metal recovery operations.

Q8. How do flow rate and breakthrough curves influence Thiourea Resin column design for PGM recovery?

Flow rate is a key parameter affecting residence time, mass transfer efficiency, and breakthrough behavior in fixed-bed resin columns. Excessive flow rates may reduce contact time and lower adsorption utilization, while optimized flow conditions improve resin capacity utilization. Breakthrough curve analysis helps determine suitable column height, operating capacity, and regeneration intervals. For gold and PGM recovery projects, dynamic column testing under representative leaching conditions is recommended to optimize process parameters and ensure stable recovery performance.

Q9. How do oxidizing agents affect the stability of Thiourea Resin during PGM leaching operations?

Oxidizing agents present in leaching solutions may influence sulfur-containing functional groups depending on oxidant type, concentration, temperature, and exposure duration. Excessive oxidation conditions may reduce resin activity or affect long-term adsorption performance. For PGM and gold recovery applications, compatibility testing with actual leach solutions is recommended before industrial implementation. Controlling oxidant levels and monitoring resin performance through repeated operating cycles can help maintain adsorption efficiency and extend resin service life.

Q10. How does gold concentration in the desorption solution affect subsequent recovery processes?

The gold concentration in the desorption solution directly influences downstream recovery methods such as precipitation, reduction, or further purification. A properly optimized desorption stage aims to achieve efficient metal release while maintaining resin regeneration performance. The final recovery process should consider gold concentration, impurity levels, solution chemistry, and product quality requirements. Integrating Thiourea Resin adsorption with suitable downstream treatment technologies can improve overall recovery efficiency and support the production of higher-value precious metal products.