Zibo Dingqi Chemicals Co., Ltd. is one of the most experienced manufacturers and suppliers of water treatment aluminum ammonium sufate in China. Welcome to wholesale high quality water treatment aluminum ammonium sufate made in China here from our factory. For price consultation, contact us.
Composition Analysis
Chemical Components
- Ammonium ions (NH₄⁺), aluminum ions (Al³⁺), sulfate ions (SO₄²⁻), and water of crystallization (12H₂O).
Elemental Composition (based on molecular weight, ~453.33 g/mol):
- Aluminum (Al): ≈ 5.96%
- Ammonium (NH₄⁺): ≈ 3.99%
- Sulfate (SO₄²⁻): ≈ 42.3%
- Water of crystallization (H₂O): ≈ 47.7%
Properties
1. Physical Properties
- Appearance: Colorless or white crystalline solid, typically in lump or powder form.
- Solubility: Highly soluble in water (~15 g/100 mL at 20°C); aqueous solution is weakly acidic (pH ≈ 3–4).
- Melting Point: ~93.5°C (loses water of crystallization); decomposes at higher temperatures to form aluminum oxide, sulfur trioxide, etc.
- Density: ~1.64 g/cm³.
2. Chemical Properties
- Hydrolysis: In aqueous solution, hydrolyzes to form Al(OH)₃ colloids with strong adsorption capacity.
- Astringency: Reacts with proteins to form precipitates, used for wound contraction or leather tanning.
- Stability: Fully dehydrates above 200°C to yield anhydrous ammonium aluminum sulfate.
Key Applications
Water Treatment
- Flocculant: Al³⁺ hydrolysis products adsorb suspended particles for water purification.
Food Industry
- Leavening Agent: Used in fried foods and baking powders (subject to safety regulations, e.g., residue limits ≤100 mg/kg as per China's GB 2760 standards).
Paper and Textile Industries
- Sizing Agent: Enhances water resistance in paper.
- Mordant: Improves dye-fiber binding in textiles.
Pharmaceuticals and Cosmetics
- Astringent & Hemostatic Agent: Incorporated in ointments or mouthwashes.
- Antiperspirant: Reduces sweat secretion (restricted in some regions).
Other Uses
- Leather Tanning: Binds collagen to soften leather.
- Fire Extinguishers: Historical component of dry powder extinguishers (largely phased out).
Safety and Environmental Considerations
- Health Risks: Excessive aluminum exposure may pose neurological concerns; strict dosage controls required in food applications.
- Environmental Impact: Aluminum residues in wastewater require treatment to prevent aquatic acidification or ecotoxicity.
Conclusion
Ammonium alum is widely utilized in water treatment, food, medicine, and other industries due to its adsorption, astringency, and acidity. However, growing awareness of aluminum-related risks and environmental regulations may drive adoption of safer alternatives in the future.
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