Overview
| Product Name | Aluminum Sulfate (Alum) |
| Chemical Category | Inorganic Coagulant |
| Molecular Formula | Al₂(SO₄)₃·xH₂O (commonly Al₂(SO₄)₃·18H₂O) |
| Molecular Weight | 342.15 g/mol (anhydrous); ~594.4 g/mol (octadecahydrate) |
| CAS Number | 10043-01-3 |
| Appearance | White to grayish crystalline solid / transparent to slightly milky solution |
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Description
Aluminum Sulfate, commonly known as Alum, is a traditional inorganic coagulant widely used in water and wastewater treatment. It is typically available in solid (granular, flake, or powder) and liquid forms. Upon dissolution in water, it produces aluminum hydroxide, which effectively adsorbs and binds impurities for floc formation. Although it generates more sludge compared to newer coagulants like PAC or ACH, Alum remains a cost-effective and widely accepted option for coagulation, pH adjustment, and phosphorus removal.
Specifications
| Grade Type | Description | Typical Concentration (%) |
|---|---|---|
| Industrial Grade | For general industrial and municipal wastewater treatment | 16%–18% Al₂O₃ (liquid); 17%±1% (solid) |
| Drinking Water Grade | High-purity grade conforming to potable water standards | 17% Al₂O₃ min |
| Low-Iron Grade | Low Fe content, suitable for paper, textile, and sensitive applications | 17%–18% Al₂O₃ |
| Granular/Flake Grade | Used in water treatment plants and paper mills | Solid form |
| Customized Grade | Adjusted basicity, iron content, or physical form as per customer needs | As requested |
Applications
- Water Treatment: Primary coagulant in drinking water purification and wastewater clarification.
- Paper Industry: Acts as a sizing agent to improve paper quality and strength.
- Textile Industry: Used as a mordant and dye-fixative.
- Construction: Applied as a setting accelerator for concrete.
- Leather & Tanning: Used in pickling and as a pH adjuster.
Advantages
- Cost-effective and widely available
- Efficient in removing turbidity, color, and phosphorus
- Compatible with a wide range of water types
- Functions as both coagulant and pH adjuster
- Readily soluble and easy to handle
Storage
Store in a dry, cool, and well-ventilated area. Protect from moisture and contamination. Avoid contact with strong alkalis and reactive chemicals. Seal containers tightly after use.
Packaging
- Solid: 25kg or 50kg PE-lined woven bag, or jumbo bag
- Liquid: 1000L IBC tank or 200L drum
- Custom packaging available upon request
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