Disclosed is a method for preparing a polymeric silicic acid polymeric zirconium chloride inorganic high-molecular flocculant. Through the copolymerization of polymeric zirconium chloride and polymeric silicic acid, Si-O-Zr bonds are formed, such that the length of the flocculant molecular chain is increased, the adsorption bridge is strengthened, the sweep flocculation is strengthened, the removal capacity on organic pollutants under a low-temperature condition is strong, and the formed flocs have large sizes and settle easily.
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