▎ 摘　　要

NOVELTY - Preparing slow-release gel aluminum modified wood chip defluorinating agent involves fully mixing the aluminum chloride solution, the urea solution and the wood chips according to the proportion. The mixture is transferred into a hydrothermal reaction kettle, and reacted for more than or equal to 9 hours at 100-120degrees Celsius. The product liquid is centrifugally separated, washed the precipitate, dried and ground. USE - Method for preparing slow-release gel aluminum modified wood chip defluorinating agent. ADVANTAGE - The method enables fluorine removal rate reaches more than 90%, and the adsorption capacity is 60120 mg/g due to fluorine adsorption.