Overview
Polyferric Sulfate (High Solid) is an advanced inorganic polymer coagulant derived from ferric sulfate through controlled polymerization. It represents a technological improvement over conventional liquid PFS, offering higher active content (typically 18-22% Fe) and reduced transportation costs. The product gained prominence in the 2000s as municipalities and industries sought more efficient alternatives to aluminum-based coagulants. As a third-generation coagulant, it combines the advantages of traditional iron salts with the stability of polymeric structures. Its development was driven by stricter environmental regulations, particularly for phosphate removal in wastewater treatment. The high-solid variant is particularly favored for large-scale applications due to its concentrated formulation.
Physical and Chemical Properties
High Solid PFS exhibits distinctive reddish-brown coloration due to iron(III) complexes. The viscosity ranges from 500-2000 mPa·s depending on concentration and temperature. Unlike conventional PFS, the high-solid version maintains stability at higher densities without significant viscosity increase, enabling easier handling. Chemically, it contains multiple polynuclear hydroxyl complexes with bridging OH- and SO4²- ligands. The basicity (OH/Fe molar ratio) typically falls between 8-16%, which directly influences coagulation performance. The product shows excellent pH adaptability, functioning effectively across pH 4-11 ranges without requiring extensive pH adjustment in most applications.
Main Applications
In drinking water treatment, High Solid PFS effectively removes turbidity (up to 99.9%), arsenic, and heavy metals while producing denser floc than aluminum salts. Its high charge density enables efficient colloidal destabilization at reduced dosages (typically 5-50 mg/L). Industrial applications include textile wastewater decolorization, where it outperforms conventional coagulants in removing reactive dyes. The product is particularly effective for phosphate removal in municipal wastewater, meeting stringent <0.5 mg/L discharge limits. Emerging uses include landfill leachate treatment and FGD wastewater purification, where its ability to complex with multiple contaminants proves advantageous.
Safety and Storage
As a strongly acidic material (pH 1-2), High Solid PFS requires corrosion-resistant storage tanks made of HDPE, FRP, or rubber-lined steel. Temperature should be maintained between 5-40°C to prevent crystallization or degradation. Shelf life is typically 6 months when properly stored. Personnel handling the product must wear acid-resistant gloves, goggles, and protective clothing. Spills should be neutralized with alkaline materials (e.g., sodium carbonate) and rinsed with copious water. The product is generally classified as non-flammable but may release SOx fumes when heated above 150°C.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification for coagulant production. Key specifications to verify include: iron content (≥11% as Fe), heavy metal impurities (<50 ppm), and viscosity (≤2000 mPa·s at 25°C). For large-volume procurement (container loads), consider manufacturers near transportation hubs to reduce logistics costs. Bulk shipments typically offer 15-30% cost savings compared to drum packaging. Technical support for dosage optimization and pilot testing should be included in supplier agreements. Current market trends show increasing demand for customized formulations with enhanced settling characteristics.
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