Sunresin pitches custom chelating resin for copper and nickel recovery

Sunresin New Materials Co. Ltd. is promoting custom iminodiacetic acid chelating resins for hydrometallurgical copper and nickel recovery from complex leach streams. The company says tailored resin chemistry and turnkey EPC support can improve selectivity, cut reagent use and boost downstream metal recovery.

Why it matters: - Copper and nickel recovery from low-grade ores and recycled feeds can be constrained by acidity, competing ions and dilute process streams. - Chelating ion exchange resins are positioned as a way to selectively capture target metals while reducing chemical use and improving recovery economics. - The approach is aimed at mining operations that need cleaner separation before electrowinning or precipitation.

What happened: - Sunresin New Materials Co. Ltd. outlined its custom iminodiacetic acid chelating resin offering for copper and nickel recovery. - The company said its SEPLITE® chelating resins are built for hydrometallurgical separation work. - Sunresin also said it provides system integration and EPC turnkey solutions for automated hydrometallurgical separation units. - More information is available on the company’s website.

The details: - Iminodiacetic acid, or IDA, functional groups bind copper and nickel through multidentate coordination on a polymer bead. - Copper binds strongly in acidic feed streams with pH values between 1.5 and 2.0. - Nickel binds effectively as pH rises toward 3.0 to 4.0. - Sodium, calcium and magnesium have minimal coordination tendency at low pH, allowing those salts to pass through. - Trivalent iron competition can be reduced by controlling feed pH or using mild reducing conditions. - Regeneration uses dilute mineral acids to protonate the active sites and release a concentrated metal eluate. - Custom manufacturing can adjust macroporous pore volume, crosslinking density and functional group distribution to match site conditions. - Optimized pore structure is intended to improve diffusion in high-viscosity leach streams and maintain capacity at high flow rates. - Higher crosslinking density is intended to improve bead strength during repeated acidic stripping cycles. - Functional group density can be tuned to balance operating capacity and physical durability. - Mining facilities can run primary, secondary and polishing columns in series to increase total metal capture. - Fractional elution can separate nickel first with a mild acid wash, followed by copper with a stronger acid wash. - Direct integration with electrowinning can lower energy use by converting dilute liquors into concentrated eluates. - Recycling barren effluent back to heap leach pads can reduce raw water intake and chemical discharge volumes. - Sunresin said it performs laboratory feasibility testing, bench-scale column studies and field pilot trials using customer leach solutions. - The company said those tests are used to define breakthrough curves, optimize bed height and refine acid stripping conditions. - Sunresin said it designs corrosion-resistant equipment skids, automated valve networks and process control instrumentation for full-scale systems. - The company said it also provides ongoing technical support, media lifecycle management and global field service.

Between the lines: - The pitch is less about a single resin product and more about a tailored separation package for difficult feeds. - The emphasis on custom pore structure, functional density and column design suggests Sunresin is targeting operations where standard resins underperform. - The process description also signals a push toward tighter integration between metal capture, stripping and downstream recovery.

What's next: - Sunresin is directing prospective customers to its website for additional information on custom chelating resin technologies and hydrometallurgical recovery solutions. - Mining operators evaluating the technology would likely need site-specific testing before full-scale deployment. - The company’s next commercial step appears to be converting lab and pilot results into installed recovery systems.