Shijiazhuang Yuncang Water Technology Corporation Limited

Aluminum Sulfate

ALUMINUM SULFATE

10043-01-3

Dialuminum trisulfate

Aluminium sulphate

Aluminum sulfate anhydrous


  • Synonyms: Dialuminum trisulfate, Aluminium sulphate, Aluminum sulfate anhydrous
  • Molecular Formul: Al2(SO4)3 or Al2S3O12 or Al2O12S3
  • Molecular Weight: 342.2
  • Product Detail

    Product Tags

    Introduction of Aluminum sulfate

    Aluminum sulfate is a salt with the formula Al2(SO4)3. It is soluble in water and is mainly used as a coagulating agent in the purification of drinking water and wastewater treatment plants, and also in paper manufacturing. Our Aluminium Sulphate has powder granules, flakes, and tablets, we also can supply no-ferric, low-ferric, and industrial grade.

    Aluminum sulfate exists as white, lustrous crystals, granules, or powder. In nature, it exists as the mineral alunogenite. Aluminum sulfate is sometimes called alum or papermaker’s alum.

    Technical Parameter

    Chemical formula Al2(SO4)3
    Molar mass 342.15 g/mol (anhydrous) 666.44 g/mol (octadecahydrate)
    Appearance White crystalline solid Hygroscopic
    Density 2.672 g/cm3 (anhydrous) 1.62 g/cm3(octadecahydrate)
    Melting point 770 °C (1,420 °F; 1,040 K) (decomposes, anhydrous) 86.5 °C (octadecahydrate)
    Solubility in water 31.2 g/100 mL (0 °C) 36.4 g/100 mL (20 °C) 89.0 g/100 mL (100 °C)
    Solubility slightly soluble in alcohol, dilute mineral acids
    Acidity (pKa) 3.3-3.6
    Magnetic susceptibility (χ) -93.0·10−6 cm3/mol
    Refractive index(nD) 1.47[1]
    Thermodynamic data Phase behavior: solid–liquid–gas
    Std enthalpy of formation -3440 kJ/mol

    Package

    Packing: lined with plastic bag, outer woven bag. Net weight: 50 kg bag

    Application

    Household Uses

    Some of the most common uses of aluminum sulfate are found within the home. The compound is often found in baking soda, although there’s some controversy over whether it’s appropriate to add aluminum to the diet. Some antiperspirants contain aluminum sulfate because of its antibacterial properties, although as of 2005 the FDA does not recognize it as a wetness reducer. Finally, the compound is the astringent ingredient in styptic pencils, which are designed to stop small cuts from bleeding.

    Gardening

    Other interesting uses of aluminum sulfate around the house are in gardening. Because aluminum sulfate is extremely acidic, it’s sometimes added to very alkaline soils to balance the pH of plants. When aluminum sulfate comes into contact with water, it forms aluminum hydroxide and a diluted sulfuric acid solution, which alters the soil acidity. Gardeners who plant hydrangeas apply this property to change the flower color (blue or pink) of the hydrangeas since this plant is very sensitive to soil pH.

    Aluminum SulfateWater Treatment

    One of the most important uses of aluminum sulfate is in water treatment and purification. When added to water, it causes microscopic impurities to clump together into larger and larger particles. These clumps of impurities will then settle to the bottom of the container or at least get large enough to filter them out of the water. This makes the water safer to drink. On the same principle, aluminum sulfate is also sometimes used in swimming pools to decrease the cloudiness of the water.

    Dyeing Fabrics

    Another one of the many uses of aluminum sulfate is in dyeing and printing on cloth. When dissolved in a large amount of water that has a neutral or slightly alkaline pH, the compound produces a gooey substance, aluminum hydroxide. The gooey substance helps dyes stick to the cloth fibers by making the dye water insoluble. The role of aluminum sulfate, then, is as a dye “fixer,” which means that it combines with the molecular structure of the dye and the fabric so the dye doesn’t run out when the fabric gets wet.

    Paper Making

    In the past, aluminum sulfate was used in making paper, although synthetic agents have mostly replaced it. The aluminum sulfate helped to the size of the paper. In this process, aluminum sulfate was combined with rosin soap to change the absorbency of the paper. This changes the ink-absorbing properties of the paper. Using aluminum sulfate means that the paper was made under acidic conditions. The use of synthetic sizing agents means that acid-free paper can be produced. The acid-free paper does not break down as fast as paper sized with acid.


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