Sodium Aluminate Coagulant
CAS Number: 1302-42-7
Sodium aluminate (NaAlO2) is an alkaline coagulant that simultaneously provides coagulation and pH correction, making it valuable for treating acidic wastewaters and low-alkalinity source waters. It generates aluminum hydroxide flocs under alkaline conditions and is particularly effective for color and NOM removal in soft waters.
Technical Specifications
| appearance | White powder or clear to slightly turbid liquid |
| pH solution | 11.5–12.5 |
| insoluble matter | ≤0.1% |
| Na2O content solid | 35–40% |
| Al2O3 content solid | 40–42% |
| Al2O3 content liquid | 18–22% |
Applications
- Soft, low-alkalinity surface water coagulation
- Acidic industrial wastewater neutralization and clarification
- Combination dosing with alum for pH stability
- Paper mill retention and sizing aid
- Fluoride removal in drinking water
Key Features
- Alkaline nature provides simultaneous coagulation and pH uplift
- Effective for fluoride co-precipitation in potable water
- Improves coagulation in cold, soft, low-turbidity waters
- Often blended with alum for balanced pH and floc quality
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