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What is the difference between aluminum sulfate and alum?
Release time：
2022-06-30
Application Field Comparison
Main Applications of Aluminum Sulfate
Industrial Applications
Papermaking: Used as a sizing agent, flocculant (see previous question), and pH adjuster;
Water Treatment: Purifies drinking water and industrial wastewater by removing suspended solids through flocculation;
Textile Printing and Dyeing: Used as a mordant to fix the dye to the fiber;
Leather Processing: Used in tanning to make leather soft and durable.
Agriculture and Other Applications
Adjusts soil acidity (improves alkaline soil);
Raw material for preparing aluminum salt compounds (such as aluminum hydroxide).
Main Applications of Alum
Food Industry
Used as a leavening agent (e.g., reacts with baking soda in fried breadsticks and pastries to produce CO₂);
Used as a stabilizer and coagulant (e.g., prevents breakage when making vermicelli and beancurd sheets);
Previously used in pickles (e.g., pickled cucumbers) to increase crispness, but its use is gradually being restricted due to concerns about aluminum residue.
Other Uses
Medicine: Used externally as an astringent (styptic, antiperspirant) or antacid;
Daily necessities: Used in the production of antiperspirants and deodorants;
Fire Extinguisher: Mixed with sodium bicarbonate to make foam fire extinguishers;
Traditional Uses: Water purification (using aluminum hydroxide colloid to adsorb impurities), ingredient in baking powder.
Safety and Regulatory Differences
Aluminum sulfate: Non-toxic itself, but the dust irritates the respiratory tract, and skin contact requires protection; it is almost never used in food (only in water treatment in specific countries).
Alum: Contains aluminum ions, excessive intake may be associated with neurological diseases (such as Alzheimer's disease), many countries restrict its use in food (e.g., China stipulates that aluminum residue in noodles should be ≤100mg/kg), and its use is prohibited in some food categories.
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