Abstract
A new coagulant polysilicate iron and zinc (PSFZn) was prepared by using sodium silicate, inorganic acid, ferric chloride, zinc chloride as raw materials, the factors of (Fe+Zn):Si molar ratio, Fe:Si molar ratio, reaction temperature, reaction time and the dosage on coagulation performance were tested. The results showed that the best preparation condition of PSFZn were 60min of reaction time preparation, 30°C of temperature and 4:2:3 of n(Fe):n(Zn):n(SiO2). When the dosage was 0.4mL·L-1, the removal efficiency of turbidity was the best which could reach 98.07%. At the same time, it could be concluded that the coagulation mechanism of PSFZn was the combined action of the electric neutralization, the adsorption bridging and sticks the attachment to sweep, which was also the action of the silicic acid, the metal ions and the ions hydrolysate to the muddy colloid pellet in the simulated water sample.
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