Ferric Chloride Coagulant
CAS Number: 7705-08-0
Ferric chloride (FeCl3) solution is a classic inorganic coagulant used extensively in water and wastewater treatment for turbidity reduction and phosphorus precipitation. It rapidly hydrolyzes to form iron hydroxide flocs that adsorb suspended and colloidal matter. Available as 40% and 45% aqueous solutions.
Technical Specifications
| pH | <1.0 (neat) |
| density | 1.40–1.45 g/cm³ |
| Fe content | ≥13.5% |
| appearance | Dark brown to black liquid |
| FeCl3 content | 38–42% (40% grade) |
| free acid HCl | ≤1.5% |
Applications
- Municipal and industrial wastewater coagulation
- Biological phosphorus removal polishing
- Drinking water treatment plant dosing
- Stormwater runoff and CSO treatment
- Sludge conditioning for press filtration
Key Features
- Fast-acting coagulation over a wide pH range (4–11)
- Excellent phosphorus precipitation to sub-mg/L levels
- Cost-effective coagulant with established dosing protocols
- Compatible with polymer flocculant aids for enhanced settling
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