- Product: Aluminum Sulfate
- Form: Powder/Flakes/Granular
- AL2O3 %: ≥17
- CAS No: 10043-01-3
- HS Code: 28332200
- Molecular Formular: Al2(SO4)3
Aluminum Sulfate, also known as alum, is a chemical compound with the molecular formula Al2(SO4)3. Generally speaking, anhydrous aluminum sulfate appears as white crystals or powder, tastes sweet, is easily soluble in water, and is insoluble in ethanol. Its density is 2.71 g/cm³ and its melting point is 770°C. However, industrial-grade solid aluminum sulfate is in the form of white flakes, granules or blocks, and has no obvious odor.
Solid aluminum sulfate often exists in the form of containing crystal water, with the molecular formula Al₂(SO₄)₃・nH₂O. Both Aluminum sulfate hexadecahydrate and aluminum sulfate octadecahydrate are more commonly used in industry. Al₂(SO₄)₃・16H₂O is stable in air and weathers when relative humidity is below approximately 25%. Its melting point is 86.5°C. Continued heating causes it to melt, decompose, and release sulfur trioxide. Water of crystallization is lost upon heating to 250°C.
Al₂(SO₄)₃・18H₂O is a non-toxic, shiny crystal with a relative density of 1.61 g/cm³. It is relatively stable and resists weathering and water of crystallization, but it loses water upon heating. And Liquid aluminum sulfate is an excellent primary coagulant, removing turbidity and suspended matter by neutralizing charge and flocculating raw water.
| Item | Aluminum Sulfate Granular/Tablets/Powder |
| AL2O3 % | ≥17 |
| Fe % | ≤0.005 |
| Insoluble matter in water % | ≤0.05 |
| Heavy metals as Pb % | ≤0.0005 |
| AS % | ≤0.0005 |
| PH value (1% aqueous solution) | 3.0 |
| Packing | PP/PE50kg/bag, 25kg/bag, Jumbo bag or according to customers’ requirements. |
Main Uses of Aluminum Sulfate
As an important inorganic chemical product, aluminum sulfate for sale always plays a key role in many industries due to its chemical properties such as easy hydrolysis and reaction with various substances. It can be widely used in water treatment plants, papermaking industry, industrial manufacturing field, medical treatment, pigments, petrochemical industry and other industries.
Non ferrous aluminum sulfate for water treatment. This chemical can be used as a water purifier or flocculant in drinking water or industrial wastewater, and can effectively remove suspended matter, colloids, heavy metal ions and other harmful substances in the water, so that the water quality meets national standards.
- Paper industry. As a precipitating agent, aluminium sulphate can help in sizing of paper at neutral and alkaline pH, thus improving paper quality (reducing spotsand holes and improving sheet formation and strength) and sizing efficiency.
Firefighting industry. As a retaining agent in foam fire extinguishing agents, it helps to stabilize and last longer in the foam.
Wood industry. Used as a preservative and waterproofing agent to improve the durability and waterproof properties of wood.
- Textile industry. Color fixing in naphthol based dyes for cotton fabric.
- Food additives. Regulate the acidity and stabilize the texture of processed foods.
- Chemical production. Aluminum sulfate can be used in the production of various chemicals, including synthetic rubber, synthetic resins, and dyes,etc.
Performance Characteristics
- Coagulation and Purification Efficiency. After dissolution, the ionized Al⁺ hydrolyzes to form aluminum hydroxide colloid. This colloid has extremely strong adsorption capacity and can quickly absorb suspended particles, organic matter, and colloidal impurities in water, forming large flocs that settle and effectively purify the water. Its coagulation efficiency is remarkable when treating highly turbid water, and its cost is lower than that of organic flocculants. It is an ideal choice for purifying construction wastewater (such as concrete mixing plant wastewater) and groundwater.
- Building Material Modification. As a concrete admixture, aluminum sulfate accelerates cement hydration, shortens initial setting time, and achieves early strength, increasing concrete strength by 10%-20% within three days. Furthermore, its acidic properties form a passivating film on steel bars, effectively inhibiting corrosion in humid environments and extending the life of building structures.
- Fire Retardant Auxiliary Function. When heated, aluminium sulfate releases water of crystallization and absorbs heat, slowing the material’s heating rate. The sulfur trioxide gas produced by decomposition dilutes combustible gases and suppresses the spread of flames. As an additive in fire-retardant coatings and fire-retardant mortars, it can extend the fire-resistant life of steel structure fire-retardant coatings by 1-2 hours. It also produces no toxic smoke during combustion, making it safer than halogen-containing flame retardants.
- Soil Improvement Effects. In foundation treatment, aluminum sulfate can undergo ion exchange and colloidal coagulation reactions with clay minerals in the soil, improving soil structure and reducing permeability by 1-2 orders of magnitude, significantly increasing the foundation’s bearing capacity. It is particularly suitable for soft soil foundation reinforcement and road base stabilization projects, effectively increasing soil dry density and reducing compressibility.
Why Choose Fengbai
- A leading aluminum sulfate manufacturer and supplier in China.
- Fengbai factory owns the most advanced production workshops and technology.
- Stable supply & delivery on time.
- Various packaging to meet customers' requirement.
- All of our products have passed ISO 9001, SGS certifications.
- We provide good quality products, competitive factory prices and excellent services for all the clients.