Characterisics:
White hygroscopic crystal or piece. Soluble in water, non-soluble in alcohol.
Aluminium sulfate, alternatively spelled either aluminum or sulphate, is a chemical compound with the formula Al2(SO4)3. It is soluble in water and is mainly used as a flocculating agent in the purification of drinking water and waste water treatment plants, and also in paper manufacturing.
Aluminium sulfate is sometimes referred to as a type of alum. Alums are double sulfate salts, with the formula AM(SO4)2·12H2O, where A is a monovalent cation such as potassium or ammonium and M is a trivalent metal ion such as aluminium.[4] The anhydrous form occurs naturally as a rare mineral millosevichite, found e.g. in volcanic environments and on burning coal-mining waste dumps. Aluminium sulfate is rarely, if ever, encountered as the anhydrous salt. It forms a number of different hydrates, of which the hexadecahydrate Al2(SO4)3？16H2O and octadecahydrate Al2(SO4)3？18H2O are the most common. The heptadecahydrate, whose formula can be written as [Al(H2O)6]2(SO4)3？5H2O, occurs naturally as the mineral alunogen.
Item | Aluminium Sulphate | Ironless Aluminium Sulphate |
| Al2O3 Content, %≥ | 15.8-17 | 17 |
| As2O3, %≤ | 0.01 | 0.0005 |
| Fe2O3, %≤ | 0.35 | 0.005 |
| Free Acid, %≤ | nill | nill |
| Water Insoluble, %≤ | 0.1 |
0.1 |
Use:
Treatment for the drinking water and water for industrial use.
Also used in papermaking, printing and dye, tanning leather, fire-fighting equipment, drug and wood preservation, etc.
Aluminium sulfate is used in water purification and as a mordant in dyeing and printing textiles.
In water purification, it causes impurities to coagulate into larger particles and then settle to the bottom of the container (or be filtered out) more easily. This process is called coagulation or flocculation.
Aluminium sulfate is sometimes used to reduce the pH of garden soil, as it hydrolyzes to form the aluminium hydroxide precipitate and a dilute sulfuric acid solution.
An example of what changing the pH level of soil can do to plants is visible when looking at theHydrangea macrophylla.
The gardener can add aluminium sulfate to the soil to reduce the pH level which in turn will result in the flowers of the Hydrangea turning a different color (blue).
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