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Aluminium Sulfate (Al(SO)) - Versatile Industrial Coagulant & Chemical Intermediate
Product Overview
Aluminium sulfate is a water-soluble inorganic salt with the formula Al(SO), widely recognized for its role as a coagulating agent in water treatment and as a key additive in paper manufacturing. Available in anhydrous form (rare mineral millosevichite) and hydrated forms (notably hexadecahydrate Al(SO)·16HO and octadecahydrate Al(SO)·18HO), this compound delivers exceptional performance across industrial, environmental, and technical applications.
Key Applications
1. Water Treatment & Purification
·Coagulant for Drinking Water & Wastewater: Neutralizes particle charges to promote flocculation, removing impurities in municipal and industrial water systems.
·Pool & Cooling Tower Treatment: Efficiently clarifies water by precipitating suspended solids.
·Mining Wastewater: Reduces turbidity and heavy metal ions through coagulation.
2. Paper Manufacturing
·Papermakers Alum: Acts as a sizing agent to improve ink retention and paper strength, and as a flocculant in pulp processing.
3. Construction & Fire Safety
·Concrete Accelerator & Waterproofing Agent: Speeds up setting time and enhances water resistance.
·Fire Extinguishing Foam: Reacts with sodium bicarbonate to generate CO-rich foam, smothering hydrocarbon fires (commonly used in Japan/India).
4. Agriculture & Horticulture
·Soil pH Regulator: Lowers soil alkalinity, ideal for acid-loving plants (e.g., hydrangeas, which change flower color with pH adjustment).
·Molluscicide: Effective against Spanish slugs in agricultural settings.
5. Industrial & Chemical Synthesis
·Textile Dyeing Mordant: Fixes dyes to fibers by forming insoluble pigment-alum complexes.
·Phase Transfer Catalyst: Facilitates organic reactions (e.g., Williamson ether synthesis).
·Antiperspirant & Medicinal Ingredients: Historical use in antiperspirants and sting relief products (e.g., Stingose).
Physical & Chemical Properties
Property Parameter
Chemical Formula Al(SO)
CAS Number 7647-15-6
Appearance White crystalline powder/granules
Solubility 90.5 g/100mL water (25°C)
Density 3.21 g/cm³ (crystal)
Melting Point 747°C
Boiling Point 1,390°C
pH (5% Solution) 6.5-8.0
Hygroscopicity Strong (requires moisture-proofing)
Packaging & Supply Chain
·Packaging Options:
·25kg/50kg plastic-lined woven bags
·1000kg ton bags
·Customized IBC tanks (20,000L) for bulk orders
·Storage Conditions: Cool, ventilated warehouse; keep away from oxidants and moisture.
·Transportation: Non-hazardous (UN no special requirements); protected from rain and high temperatures.
Quality & Compliance
·Purity Grades:
·Industrial grade: 99.0%
·Reagent grade: 99.9%
·Standards: Compliant with ISO 9001, REACH (for EU markets), and local environmental regulations.

Product Description

Aluminum sulfate (Chemical formula: Al2 (SO4) 3) is a widely used industrial reagents. Aluminum sulfate as a flocculant for the purification of drinking water and sewage treatment equipment which is also used in the paper industry.

Aluminium Sulfate Application

1.Paper making industry used as paper sizing agents,to enhance paper water--resistant

2. Soluble in water can make tiny particles and natural colloidal particles condensed into large floc, thus remove them from, therefore, used for water and wastewater coagulants.

3. Used for the cleaning agent, also used as a precipitating agent fixing agent filling agent.

4. Fire industry, with baking soda and foaming agent composition foam extinguishing agent.

5. Analysis reagent, mordant, tanning agent, oil decoloring agent, wood preservative.

6. For raw materials, used in the manufacture of artificial stone and senior aluminium ammonium sulfate, other aluminate.

Aluminum sulfate, which accounts for about 50% of the total output, is mainly used for papermaking, and the second is used as flocculant in drinking water, industrial water and industrial wastewater treatment, accounting for about 40% of the total output of aluminum sulfate. When aluminum sulfate is added to this kind of water, colloidal aluminum hydroxide flocs can be formed, which can absorb and precipitate bacteria, colloids and other suspended matters. When used in drinking water treatment, the color and taste of water can be controlled.