Overview
Ferrous Chloride (FeCl2) is a greenish-white crystalline compound primarily used in industrial and chemical applications. It is a key intermediate in iron chemistry and serves as a precursor to other iron compounds. Its reducing properties make it valuable in organic synthesis and wastewater treatment. Produced by reacting iron with hydrochloric acid or through the reduction of ferric chloride, it is commercially available in anhydrous and hydrated forms. The tetrahydrate (FeCl2·4H2O) is common in laboratory settings due to its stability.
Physical and Chemical Properties
Anhydrous ferrous chloride forms deliquescent crystals with a high affinity for water, often forming hydrates. It exhibits paramagnetic behavior and dissolves exothermically in water, producing acidic solutions. The compound oxidizes slowly in air to form ferric chloride (FeCl3). Its reducing capability is exploited in reactions where it donates electrons, such as in the reduction of aromatic nitro compounds. The hydrated form decomposes upon heating, releasing water and hydrogen chloride gas.
Main Applications
In water treatment, ferrous chloride acts as a coagulant to remove phosphates and sulfides, improving effluent quality. The pharmaceutical industry uses it as a catalyst and reducing agent in drug synthesis, particularly for iron supplements. Other uses include dye fixation in textile manufacturing, PCB etching, and as a nutrient in animal feed. Its role in organic chemistry includes facilitating reductions in palladium-catalyzed reactions and serving as a Lewis acid catalyst.
Safety and Storage
Ferrous chloride is corrosive to metals and tissues. Direct contact may cause skin burns or eye damage. Inhalation of dust can irritate respiratory tracts. Always use gloves, goggles, and respirators when handling. Store in sealed, corrosion-resistant containers (e.g., polyethylene) in dry, cool areas. Separate from oxidizers and bases to prevent hazardous reactions. Spills should be neutralized with sodium carbonate and cleaned promptly.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO certification and batch-specific COAs (Certificates of Analysis). Technical-grade (≥98%) is suitable for most applications, while reagent-grade (≥99%) is needed for pharmaceuticals. Bulk shipments typically use 1-ton bags or lined steel drums. Consider regional logistics: coastal facilities may offer better rates for imported material. Spot prices fluctuate with iron ore and hydrochloric acid market trends.
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