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Aluminum ions undergo multi-step hydrolysis to form positively charged aluminum hydroxide colloid \(\ce{Al(OH)3}\). The colloid neutralizes negative charges on suspended particles such as coal slime and sediment, making particles destabilized.
Aluminum hydroxide colloid aggregates, adsorbs suspended solids and organic pollutants, and forms large flocs that settle down by gravity.
Aluminum ions react with phosphate radicals to form insoluble aluminum phosphate precipitate to remove phosphorus.
Combined with lime, it reacts with fluoride ions to form calcium fluoroaluminate precipitate for efficient defluoridation.
Properties & Reaction Principle of Aluminum Sulfate for Water Treatment
Basic PropertiesWhite fine powder, soluble in water. Aqueous solution is weakly acidic. Chemically stable under normal temperature, non-flammable, low toxicity and irritant.
Colloids adsorb pollutants and form large flocs for sedimentation.
React with phosphate to form precipitate for phosphorus removal.
Combined with lime, it removes fluoride from high-fluoride wastewater.
Application ConditionOptimal pH range: 6.0~8.0. Widely used for coal mine wastewater, industrial sewage and municipal water treatment.
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