Overview
Potassium ethyl xanthate (PEX) is an organosulfur compound primarily used in the mining industry as a flotation agent for sulfide ores. Its ability to selectively bind to metal sulfides makes it indispensable in mineral processing. Beyond mining, PEX serves as a vulcanization accelerator in rubber production and a precursor in chemical synthesis. First synthesized in the early 20th century, PEX gained prominence due to its efficiency in ore beneficiation. It is commercially available as a yellowish powder or crystalline solid, often with a pungent odor characteristic of xanthates.
Physical and Chemical Properties
PEX exhibits a molecular weight of 160.30 g/mol and a density of 1.558 g/cm³. It decomposes at 220-225°C without boiling, releasing carbon disulfide and other byproducts. The compound is hygroscopic, requiring airtight storage to prevent degradation. Its solubility profile includes high solubility in water and alcohol but limited solubility in acetone. PEX reacts violently with strong acids, releasing toxic gases. The compound’s stability is pH-dependent, with optimal performance in alkaline conditions common in flotation processes.
Main Applications
In mining, PEX selectively separates sulfide minerals (e.g., copper, lead, zinc) from gangue via froth flotation. Its polar group bonds with metal ions, while the hydrophobic ethyl group facilitates attachment to air bubbles. Rubber industries use PEX as a secondary vulcanization accelerator, enhancing cross-linking efficiency. It also acts as an intermediate in pesticide and pharmaceutical synthesis. Emerging applications include wastewater treatment for heavy metal removal, though this remains niche due to cost considerations.
Safety and Storage
PEX requires careful handling due to its irritant properties and decomposition risks. Storage areas must be cool (<30°C), dry, and isolated from acids or oxidizers. Moisture-proof packaging (e.g., polyethylene-lined bags) is essential to prevent caking. Exposure controls include local exhaust ventilation and PPE (nitrile gloves, goggles). Spills should be neutralized with sodium carbonate and collected in labeled containers. Decomposition products (e.g., CS2) are flammable and toxic, necessitating fire-resistant storage cabinets.
B2B Procurement Guide
Buyers should prioritize suppliers providing batch-specific Certificates of Analysis (CoA) confirming purity (≥90%) and low heavy metal content. Packaging options include 25 kg woven bags with inner PE liners or customized bulk containers for large-scale users. Key procurement metrics include lead time (typically 2-4 weeks), MOQ (1 metric ton), and Incoterms (FOB or CIF). Spot prices fluctuate with potassium hydroxide and ethanol feedstock costs. Long-term contracts may offer 5-10% discounts for quarterly shipments.
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