Aluminum dihydrogen phosphate, also known as aluminum phosphate, is an inorganic compound composed of aluminum ions and dihydrophosphate ions . It is usually found in anhydrous or hydrated form, and the hydrated form of aluminum dihydrogen phosphate contains a certain number of crystalline water molecules.

Aluminum dihydrogen phosphate is a white or colorless powder that is strongly acidic, soluble in water, and acidic in solution. It is mainly used in industry as a catalyst, corrosion inhibitor, flocculant, ion exchanger and clay stabilizer, etc.

Aluminum dihydrogen phosphate is a versatile inorganic compound that is widely used in various fields:

1. Water treatment: Aluminum dihydrogen phosphate is an effective flocculant used to purify drinking and industrial water, help remove suspended solids and turbid substances, and improve the clarity of water quality.

2. Anticorrosive agent: In metal surface treatment, aluminum dihydrogen phosphate can be used as a corrosion inhibitor to form a protective film to prevent metal corrosion and prolong the service life of metal materials.

3. Catalyst: Aluminum dihydrogen phosphate is used as a catalyst or catalyst carrier in the chemical industry to promote chemical reactions, such as hydrogenation, dehydration, esterification and other reactions.

4. Clay stabilizer: In the construction and oil drilling industry, aluminum dihydrogen phosphate is used as a clay stabilizer to prevent clay hydration and swelling, improve the stability of the soil and the performance of the drilling fluid.

5. Flame retardant: Aluminum dihydrogen phosphate is used as a flame retardant for plastics, rubber, and other synthetic materials because it can release water vapor and non-flammable gases at high temperatures, thereby inhibiting the spread of flames.

6. Rocket fuel: In some types of rocket fuel, aluminum dihydrogen phosphate can be used as a catalyst or stabilizer to improve the combustion performance of the fuel.

7. Food additives: Aluminum dihydrogen phosphate is used in the food industry as a buffer, acidity regulator, stabilizer or preservative, as well as as as a yeast nutrient to help bread and other bakery products ferment.

8. Agriculture: Aluminum dihydrogen phosphate can be used as a phosphate fertilizer for plants, providing the phosphorus elements needed for plant growth.