Ion exchange resin adsorption for the removal of heavy metals from wastewater and the recovery of copper, nickel, lead, zinc, manganese, and cobalt

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Typical characteristics: Type: Weak-acid cation exchange resin. Structure: Macroporous cross-linked polystyrene. Functional groups: Iminodiacetic acid. Physical form: Hydrated spherical particles. Ionic form: Sodium. Particle size distribution: 16–50. Particle size: 0.3–1.2 mm. Total exchange capacity: 2.0 meq/ml (H+). Swelling coefficient: H+ → Na+, 20%. Water content: 45–50%. pH range: 0–14. Solubility: Insoluble in any solvent. Backwash sedimentation density: 0.72–0.79 g/ml. Functional groups of CH-90 resin: As awareness of environmental protection grows, traditional precipitation methods can no longer meet the increasingly strict environmental requirements (for example, the nickel content in electroplated coatings must be below 0.1 mg/l). Taking into account the characteristics of specific heavy metal ions, Corex utilizes the special functional groups of chelating resins to form complexes with these ions, thereby enabling the recovery and thorough removal of heavy metal ions. CH-90Na exhibits specific selectivity toward metals such as copper, nickel, lead, zinc, cobalt, and manganese. It has a strong binding capacity and practical advantages, especially in the treatment of nickel ions and nickel in complexed forms (such as citrate, acetate, malate, tartaric acid, succinic acid, hydroxyacetic acid, etc., as well as zinc-nickel alloys and nickel-ammonium complexes). It is suitable for directly adsorbing nickel in acidic environments (with a pH of around 3), and its saturated adsorption capacity is approximately 50 g/L. Functional group: Iminodiacetic acid group. Treatment precision: 0.02 mg/l. Optimal pH range: 3–5. Selectivity order: Cu > Ni > Zn > Co > Cd > Fe > Mn >> Na. Influent concentration: 5000 mg/l (concentrations above 5 g/l are not very meaningful). Regeneration agents: Hydrochloric acid/sulfuric acid (at a concentration of around 5%). Amount of regeneration agent used: 2BV–3BV. Regeneration flow rate: 4BV/H. Regeneration time: 30–45 minutes. Backwash water: Pure water/soft water/tap water. Backwash flow rate: 5–10BV/H. Backwash time: 30 minutes. Conversion agent: Sodium hydroxide (5% concentration). Conversion flow rate: 4BV/H. Conversion time: 30 minutes. This product boasts advantages such as high precision and high adsorption capacity, and it can also be used for the advanced treatment of wastewater with low concentrations. 1. High treatment precision: The heavy metal content in various types of wastewater can be reduced to 0.02 ppm, which is far below the **standard ； 2. High adsorption capacity: The saturated adsorption capacity for copper can reach 64 g/l ； 3. It can address the treatment of low-concentration wastewater: it is capable of carrying out in-depth treatment of such wastewater, with a high concentration ratio, thereby solving the challenges associated with treating low-concentration wastewater ； 4. Automation and ease of use: Modular design with a high degree of automation, making operation simple ； 5. Long service life: After several regeneration cycles, the resin can be used for 3–5 years before it needs to be replaced