Method for removing fluorine from copper smelting wastewater gypsum filtrate

The invention relates to the technical field of wastewater treatment, in particular to a method for removing fluorine from copper smelting wastewater gypsum filtrate. The method comprises the following steps: adding defluorination reagents A and B into gypsum filtrate according to a certain proportion, fully mixing, and uniformly stirring to obtain a mixed solution; adding soluble hydroxide into the mixed solution, fully mixing, uniformly stirring, and adjusting the pH value of the reaction system; adding a coagulant aid into the mixed solution according to a certain proportion, fully mixing, uniformly stirring, standing, and filtering to obtain a precipitate and a filtrate; according to the method, most fluorine ions and heavy metal pollutants in the gypsum filtrate can be removed, the concentration of the fluorine ions in the gypsum filtrate can be reduced to 5 mg/l or below, the GB25467-2010 Emission Standard of Pollutants for Copper, Cobalt and Nickel Industry can be met, and the environmental protection