Article Keywords: Aluminum Sulfate, Ferrous Sulfate, Polyaluminum Chloride (PAC), Polyacrylamide (PAM)
Aluminum sulfate is a common inorganic compound with the chemical formula Al₂(SO₄)₃, a molecular weight of 342.15, and a white crystalline appearance. As a vital chemical agent in the field of water treatment, its core function lies in generating colloidal particles through hydrolysis reactions; these particles adsorb and precipitate suspended solids, colloids, and certain dissolved impurities present in the water, thereby achieving water purification. Its application scenarios span various fields, including drinking water treatment, industrial wastewater treatment, the preparation of rosin sizing agents in the papermaking industry, and petroleum decolorization.
I. Technical Principles and Core Functions:
When aluminum sulfate dissolves in water, aluminum ions (Al³⁺) bind with water molecules to form hydrated aluminum ions, which subsequently undergo further hydrolysis to generate aluminum hydroxide colloids. The surfaces of these colloids carry a positive charge, enabling them to neutralize the negative charges on suspended particles in the water. This neutralization disrupts the particles' stability, promoting their aggregation into larger flocs (clumps), which are ultimately separated through sedimentation or filtration. This entire process is known as "coagulation-sedimentation" and constitutes a critical step in water treatment. Furthermore, aluminum sulfate can react with certain heavy metal ions present in the water (such as iron and manganese) to form insoluble precipitates, thereby aiding in the removal of dissolved pollutants.
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II. Application Scenarios and Operational Considerations:
In drinking water treatment, aluminum sulfate is typically used in conjunction with coagulant aids—such as activated carbon or polyacrylamide—to effectively remove turbidity, algae, and organic matter. In industrial wastewater treatment, the dosage of aluminum sulfate must be adjusted based on the water's pH value: under acidic conditions, the hydrolysis of aluminum ions proceeds efficiently; however, excessive dosing may result in residual aluminum levels in the treated effluent that exceed regulatory limits. Conversely, in alkaline environments, it is necessary to add pH-adjusting agents (such as lime) to optimize the flocculation efficiency. In the papermaking industry, aluminum sulfate serves as a sizing agent for rosin sizing; it reacts with rosin acids to form insoluble aluminum soaps, thereby enhancing the paper's water resistance. In the field of petroleum decolorization, the compound's adsorptive properties are utilized to remove gums and asphaltenes from oil products. III. Technical Advantages and Practical Performance:
Compared to other flocculants (such as iron salts), aluminum sulfate possesses the following characteristics: First, the colloidal aluminum hydroxide produced during hydrolysis features uniform particle size and high flocculation efficiency, thereby reducing the required dosage of the chemical agent. Second, it is effective across a relatively broad pH range (5.5–8.5), eliminating the need for extensive adjustment of the water's acidity or alkalinity. Third, residual aluminum ions can be further removed through subsequent treatment processes (such as sand filtration or activated carbon adsorption), thereby mitigating the risk of secondary pollution. Experimental data indicate that when treating high-turbidity river water, an aluminum sulfate dosage of 30–50 mg/L can achieve a turbidity removal rate exceeding 90%, ensuring that the treated effluent meets sanitary standards for domestic drinking water.
IV. Safety and Storage Guidelines:
It is essential to avoid co-storage with strong bases or strong oxidizing agents to prevent exothermic reactions. The storage environment must be kept dry and maintained at a temperature below 50°C to prevent the product from absorbing moisture and caking. During handling, protective gloves and safety goggles should be worn to prevent dust inhalation or skin contact. In the event of accidental contact with the eyes, immediately flush with copious amounts of clean water and seek medical attention. During transportation, precautions must be taken to protect the product from moisture and physical damage, ensuring the integrity of the packaging.
Post time: Mar-25-2026
