Overview
Cyanex is a trademarked series of organophosphorus solvent extraction reagents developed by Cytec Industries (now part of Solvay). These reagents are primarily used in hydrometallurgical processes to selectively extract and separate metals from aqueous solutions. The Cyanex family includes variants like Cyanex 272 (bis(2,4,4-trimethylpentyl)phosphinic acid), Cyanex 301 (dialkylphosphinic acid), and others, each optimized for specific metal ions. These reagents are favored in industries such as mining, battery recycling, and rare earth processing due to their ability to operate under harsh acidic conditions while maintaining high selectivity. Their development marked a significant advancement in solvent extraction technology, enabling more efficient metal recovery with lower energy consumption compared to traditional methods.
Physical and Chemical Properties
Cyanex reagents are typically viscous liquids with colors ranging from clear to pale yellow. They exhibit low volatility and high thermal stability, decomposing only at temperatures above 200°C. Their solubility in organic diluents like kerosene makes them ideal for solvent extraction systems, while their negligible water solubility minimizes losses during phase separation. Key chemical properties include strong affinity for divalent and trivalent metal ions (e.g., Co²⁺, Ni²⁺, RE³⁺) and stability across a wide pH range. For example, Cyanex 272 shows optimal cobalt/nickel separation at pH 4–6. The reagents are also characterized by their low aqueous solubility (<1 ppm), which reduces environmental discharge risks.
Main Applications
The primary use of Cyanex reagents is in the separation of cobalt and nickel, a critical step in battery material production and stainless steel refining. Cyanex 272, for instance, selectively extracts cobalt over nickel with a separation factor exceeding 10,000, enabling high-purity cobalt recovery. Other applications include rare earth element (REE) extraction from ores or recycled magnets, where Cyanex 572 is often employed for its ability to separate light and heavy REEs. In uranium processing, Cyanex 301 is used to purify leach solutions. The reagents are also applied in copper refining, zinc purification, and recovery of precious metals from electronic waste.
Safety and Storage
Cyanex reagents require careful handling due to their combustible nature and potential skin/eye irritation. Proper PPE (gloves, goggles, respirators) is essential when handling concentrated forms. Storage should be in sealed, corrosion-resistant containers (e.g., stainless steel or HDPE drums) away from heat sources and oxidizers. Spills should be contained with inert absorbents and disposed of as hazardous waste. Although Cyanex reagents have low acute toxicity, prolonged exposure may cause organ damage, necessitating workplace air monitoring and adequate ventilation. Transportation typically requires UN-certified packaging under Class 9 (Miscellaneous Dangerous Goods).
B2B Procurement Guide
When procuring Cyanex reagents, buyers should specify the exact variant (e.g., Cyanex 272 vs. 301), minimum purity (typically 85–93%), and preferred diluent (if pre-mixed). Bulk purchases (tonnage quantities) often qualify for discounts of 10–20% but require adherence to MOQs. Packaging options include 180 kg steel drums or IBC totes for large-scale users. Key suppliers include Solvay, BASF, and specialty chemical distributors. Lead times vary from 4–8 weeks for custom formulations. Buyers should request certificates of analysis (CoA) and SDS documentation. For sustainability-focused procurement, some suppliers offer bio-based alternatives or recycling programs for spent reagents.
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