Description
Aluminium Sulphate, also known as Aluminum Sulfate, is an inorganic chemical compound with the formula Al₂(SO₄)₃·xH₂O.
It is widely used as a coagulant and flocculating agent in water and wastewater treatment, as well as in paper manufacturing, textiles, chemical processing, and selected industrial applications.
GENOME SPECIALITIES FZC supplies Aluminium Sulphate in different grades and physical forms to meet the requirements of water treatment plants, industrial manufacturers, paper mills, textile processors, and other commercial applications.
Aluminium Sulphate is particularly valued for its ability to destabilize suspended particles in water, allowing them to combine into larger flocs that can be separated through sedimentation and filtration.
Key Properties
| Property | Typical Value / Description |
| Chemical name | Aluminium Sulphate / Aluminum Sulfate |
| Chemical formula | Al₂(SO₄)₃ · xH₂O |
| Molecular weight | ~342.15 g/mol (anhydrous) |
| Appearance | White to off-white crystalline solid or powder |
| Odor | Odorless |
| Purity | 98 – 99 % (industrial grade, typical) |
| Moisture content | Variable (hydrated salt) |
| pH (1% aqueous solution, 25 °C) | 2.5 – 3.5 |
| Solubility in water | Freely soluble |
| Solubility in alcohol | Insoluble |
| Bulk density | 0.9 – 1.1 g/cm³ (powder) |
| Melting point | ~770 °C (decomposes) |
| Boiling point | Not applicable (decomposes) |
| Ionic nature | Inorganic salt |
| Hygroscopic nature | Hygroscopic |
| Stability | Stable under normal conditions |
| Storage condition | Store in a cool, dry place, tightly sealed |
Uses of Aluminium Sulphate
Water Treatment
It can assist in reducing turbidity and removing suspended and colloidal material during conventional water-treatment processes.
For potable-water applications, however, the product must meet the appropriate drinking-water chemical standard and local regulatory requirements.
Paper Manufacturing
Used as a sizing agent to improve the quality of the paper.
It helps to make the paper more water-resistant and less absorbent to ink, which is important for writing and printing.
It also helps to control the pH of the pulp and improves the retention of fillers and fibers.
Gardening
Aluminium sulphate can be used in gardening to lower the pH of alkaline soil, making it more acidic. This is particularly beneficial for acid-loving plants like hydrangeas, azaleas, and blueberries. For hydrangeas, using aluminium sulphate can also change the flower color from pink to blue by increasing the availability of aluminum ions in the soil.
Other Uses
Textile Industry: It acts as a mordant in dyeing fabrics, helping the dye to bind to the cloth fibers and produce a more vibrant and permanent color.
Aluminium Sulphate Grades
Aluminium sulphate is available in different grades according to purity, iron content, intended application, and regulatory requirements.
- Industrial / Technical Grade
Typical applications include:
- Water treatment
- Wastewater treatment
- Paper manufacturing
- Textile processing
- Industrial chemical processes
It offers an economical solution for high-volume applications.
- Non-Ferric / Low-Iron Aluminium SulphateN
Low-iron grades are particularly useful where iron contamination or discoloration can affect the final process or product.
Potential applications include:
- Drinking water treatment
- Paper manufacturing
- High-quality industrial processes
- Applications requiring controlled iron levels
- Food Grade Aluminium Sulphate
Food-grade aluminium sulphate is manufactured to applicable food chemical specifications where permitted.
Potential uses can include specific food-processing applications such as firming or leavening-related systems, depending on the applicable regulations.
Food-grade status should always be verified against the applicable local regulations and current specification before use in food applications.
- Laboratory / Analytical Grade
Laboratory and analytical grades are produced to higher purity specifications for research, testing, and analytical applications.
These products typically have tighter impurity limits and may be supplied with detailed analytical certificates.
- Pharmaceutical Grade
Pharmaceutical-grade aluminium sulphate, where available for a specific application, must meet the requirements of the relevant pharmacopoeial or regulatory standard.
Such material should not be assumed to be pharmaceutical grade merely because it has high purity. The applicable certification and specification must be verified.
Physical Forms of Aluminium Sulphate
GENOME SPECIALITIES can support applications requiring different physical forms of aluminium sulphate, subject to product availability and specification.
Solid Aluminium Sulphate
Solid forms may include:
- Powder
- Granules
- Flakes
- Crystalline material
Solid products are convenient for storage, transportation, and preparation of treatment solutions.
Liquid Aluminium Sulphate
Liquid aluminium sulphate is supplied as an aqueous solution and can be particularly convenient for large-scale water treatment systems because it can be metered directly into dosing equipment.
Liquid concentration, density, crystallization behavior, and storage requirements should be confirmed for the selected product.
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