Aluminum Sulfate Product Description CAS#10043-01-3

Aluminum sulfate is a common inorganic salt with the chemical formula Al₂(SO₄)₃ and a molecular weight of 342.15. It commonly exists as a hydrated form with the molecular formula Al₂(SO₄)₃·nH₂O, and industrially it is mostly found as the octahydrate Al₂(SO₄)₃·18H₂O. At room temperature, it is a white, odorless, lustrous orthorhombic crystal or powder. Its melting point is 770°C (decomposes), and its density is 2.71 g/cm³. Regarding solubility, aluminum sulfate is readily soluble in water, with a solubility of 31.2 g at 0°C, 36.4 g at 20°C, and up to 89 g at 100°C; it is insoluble in ethanol. Aluminum sulfate is prone to absorbing moisture and clumping when stored in air for extended periods. Its aqueous solution is acidic. It loses its water of crystallization when heated to 250°C and begins to decompose at 530°C, with the final product being γ-Al₂O₃. Industrially, aluminum sulfate is primarily produced via the sulfuric acid process: bauxite is crushed to a specific particle size and reacted with sulfuric acid in a reactor. The reaction solution is then settled, neutralized, concentrated, cooled, solidified, and pulverized to obtain the final product. Alternatively, it can be produced by crystallizing aluminum hydroxide after reacting with sulfuric acid. Aluminum sulfate is one of the world's most produced aluminum salts. Its excellent flocculation properties and wide industrial applicability make it irreplaceable in numerous fields, including water treatment, papermaking, textiles, chemicals, daily chemicals, and agriculture.

Aluminum Sulfate Product Applications CAS#10043-01-3

Aluminum sulfate is an important inorganic chemical raw material and multifunctional chemical, widely used in water treatment, papermaking, textiles, chemicals, daily chemicals, agriculture, and food industries.

In water treatment, aluminum sulfate is one of the most commonly used inorganic flocculants, used as a water purification agent and flocculant in drinking water or industrial wastewater. Its hydrolysis produces aluminum hydroxide flocs that can coat suspended particles in water, promoting rapid sedimentation and separation. It is widely used in the purification of drinking water, industrial water, and wastewater, especially effective for water with low temperature, low turbidity, and high pH values. It can also remove color and algae from water. Aluminum sulfate is also a good defluoridator.

In the papermaking industry, aluminum sulfate is the largest application area, accounting for approximately 50% of total production. It is used as a filler, precipitant, and finishing agent in the papermaking industry (for rosin sizing, allowing color to adhere to the paper surface). Iron-free grade is used in high-grade paper sizing agents (to improve whiteness), while low-iron grade is used in ordinary paper production.