Anion exchange resin, milky white to light yellow

Anion exchange resin is a type of high-molecular-weight polymer material with negatively charged functional groups (known as ion-exchange groups) attached to its three-dimensional cross-linked framework. Its core function is to selectively exchange anions in aqueous or organic solutions—specifically, the anions bound to its functional groups can be replaced by target anions in the surrounding solution, enabling separation, purification, or removal of unwanted anionic substances.
The milky white to light yellow appearance of this specific anion exchange resin is a result of its polymer matrix composition (typically derived from styrene-divinylbenzene copolymers or acrylic copolymers) and the uniform distribution of functional groups. This physical appearance is not only a visual identifier but also an indicator of its high purity and consistent manufacturing process—irregular coloration (such as dark spots or uneven tint) often signals impurities or incomplete cross-linking, which can compromise exchange efficiency.
Historically, anion exchange resins evolved from early 20th-century innovations in ion-exchange technology. The first synthetic anion exchange resins, developed in the 1930s, laid the groundwork for modern iterations. Over decades, advancements in polymer chemistry have refined their structure: from early gel-type resins (with dense, microporous frameworks) to modern macroporous variants (featuring larger, interconnected pores). This specific milky white to light yellow anion exchange resin belongs to the advanced generation of resins, optimized for balanced mechanical stability and ion-exchange kinetics, making it suitable for both industrial-scale and laboratory-scale applications.

Keep sealed at room temperature.

It is mainly used in the process of cyanide extraction of gold, extraction of gold from ore slurry, preparation of pure water and high purity water, and so on.

Controlled Physical Form: Appears as uniform milky white to light yellow spherical beads (typical particle size range: 0.3 - 1.2 mm), ensuring consistent flow resistance when packed into columns and avoiding channeling (uneven solution flow) that reduces exchange efficiency.
Dual Porosity Options: Available in both gel-type and macroporous structures. The gel-type variant (suited for small anions like Cl⁻, SO₄²⁻) has a dense, microporous matrix for fast ion diffusion, while the macroporous variant (ideal for large organic anions or colloidal substances) features interconnected pores (pore size: 10 - 100 nm) to accommodate larger molecules.
Excellent Mechanical Strength: Resistant to osmotic shock (a common issue when switching between high- and low-concentration solutions) and attrition—less than 1% bead breakage occurs even after 1,000 cycles of regeneration and use, reducing maintenance costs and resin loss.
Temperature Tolerance: Operates stably at temperatures ranging from 5°C to 60°C (depending on the specific grade), making it compatible with both ambient-temperature processes (e.g., drinking water treatment) and moderate-heat applications (e.g., industrial wastewater remediation).

High Anion Selectivity: Exhibits strong affinity for target anions (e.g., chloride, sulfate, nitrate, phosphate, and organic anions like humic acids) over non-target ions, enabling efficient removal even at low target anion concentrations (down to ppb levels in water treatment scenarios).
Cost-Effective Regeneration: Can be repeatedly regenerated using common alkaline solutions (e.g., 4 - 8% sodium hydroxide solution) with regeneration efficiency exceeding 90% per cycle. This reduces the need for frequent resin replacement, lowering long-term operational costs compared to disposable adsorption materials.
Eco-Friendly Operation: Unlike chemical precipitation methods (which generate hazardous sludge), anion exchange using this resin produces minimal waste. Regenerated resins can be reused for 50 - 100 cycles, and spent resins are recyclable (via professional polymer recycling programs), aligning with sustainable manufacturing and environmental protection goals.

Customers interested in this milky white to light yellow anion exchange resin may also find value in other complementary ion-exchange and separation materials. These include cation exchange resins (for removing cations like Ca²⁺, Mg²⁺, and heavy metals such as Pb²⁺, Hg²⁺, often used in tandem with anion exchange resins for full deionization), mixed-bed ion exchange resins (pre-blended anion and cation resins for one-step ultrapure water production), and chelating resins (designed to selectively bind heavy metal cations like Cu²⁺, Ni²⁺, ideal for wastewater treatment in electronics and plating industries). Additionally, adsorbent materials such as activated carbon (for removing organic contaminants) and ion-exchange membranes (for electrodialysis processes in desalination) are frequently used alongside anion exchange resins in comprehensive purification systems. If you are interested in related products, you can contact us directly or request product customization services.