Aluminum sulphate , also known as alum, is a chemical compound with the chemical formula Al2(SO4)3. It is a white crystalline solid that is soluble in water and commonly used in various industrial and commercial applications. Here are some common uses of aluminum sulphate:

1. Water treatment: Aluminum sulphate is widely used as a coagulant in water treatment processes to clarify and purify water. It helps in removing impurities, suspended particles, and colloidal materials by forming flocs that can be easily removed through filtration.

2. Paper industry: Aluminum sulphate is used in the paper industry as a sizing agent and for improving paper strength. It helps in binding fibers together and improving the quality of paper products.

3. Textile industry: Aluminum sulphate is used in the textile industry for fixing dyes to fabrics during the dyeing process. It helps in enhancing the color fastness and durability of dyed textiles.

4. Soil acidity control: Aluminum sulfate is sometimes used in agriculture to adjust soil pH levels. It can help in lowering soil pH in alkaline soils, making them more suitable for certain crops that prefer acidic conditions.

5. Tanning industry: Aluminum sulfate is used in the tanning industry for pickling hides and skins during the leather tanning process. It helps in removing hair and other impurities from animal hides.

6. Deodorants and antiperspirants: Aluminum sulfate is used in the production of deodorants and antiperspirants for its astringent properties. It helps in reducing sweat production and controlling body odor.

7. Fire extinguishers: Aluminum sulfate is used in some dry chemical fire extinguishers as an extinguishing agent. It helps in smothering fires by depriving them of oxygen.

These are just a few examples of the uses of aluminum sulfate in various industries. It is a versatile compound with diverse applications due to its properties and chemical composition.