Kelex‑100 Chelating Extractant CAS 73545‑11‑6 for Metal Solvent Extraction

Dual‑functional‑group chelation: Contains quinoline ring tertiary nitrogen (protonated in acidic medium to bind anions) and 8‑hydroxyl group (dissociated in neutral/alkaline medium to bind metal cations), suitable for extraction in a wide pH range.

High selectivity: Strong chelating capacity for gallium, copper, zinc, cadmium, germanium, cobalt and other metal ions; extremely low selectivity for monovalent ions (ratio around 5000:1).

Excellent oil solubility: Freely soluble in organic solvents such as kerosene and xylene, barely soluble in water, ideal for liquid‑liquid extraction systems.

1. Gallium (Ga) recovery: Selective extraction of gallium from alkaline Bayer‑process mother liquor of bauxite, one of the mainstream industrial processes.

2. Separation of copper/zinc/cadmium: Efficient extraction of copper, zinc and cadmium in acidic medium for ore leachate and wastewater treatment.

3. Germanium (Ge) extraction: Separation and enrichment of germanium from acidic solutions of coal‑fired ash, zinc smelting slag, etc.

4. Precious metal & rare‑earth separation: Used for separation and purification of cobalt, nickel and rare‑earth elements (e.g. neodymium), often compounded with Cyanex272.

It extracts metals via dual mechanisms: cation exchange (neutral/weakly acidic environment) and anion exchange (strongly acidic environment). The metal‑loaded organic phase can be stripped with dilute acid (e.g. 1–2M H₂SO₄) to realize metal recovery and extractant regeneration.

Irritation: Irritating to skin, eyes and respiratory tract; operate with goggles, chemical‑resistant gloves and fume hood.

Environmental hazard: Avoid direct discharge; dispose as hazardous waste.

Incompatibility: May decompose and lose efficacy under high temperature with strong oxidants, strong acids and strong alkalis.

Kelex‑100 (liquid extractant) ≠ Chelex 100 (solid chelating resin, Bio‑Rad brand for molecular biology). They differ greatly in form and application.