Harmless treatment method for fixing fluorine in secondary aluminum ash

The invention discloses a harmless treatment method for fixing fluorine in secondary aluminum ash, and belongs to the technical field of hazardous waste harmless treatment. The treatment method comprises the following steps: fully mixing the denitrified secondary aluminum ash with water to obtain a mixed solution containing fluorine ions; adding hydroxyapatite into the mixed solution containing fluorine ions obtained in the step (1), and carrying out primary reaction to generate fluorapatite; and adding an acetic acid solution into a reaction system, continuously reacting to generate fluorapatite and removing fluorine ions in the mixed solution. According to the treatment method, fluorine ions in the secondary aluminum ash after nitrogen removal can be efficiently removed, the treatment cost and the influence on the environment are reduced, and harmless treatment is achieved. 本发明公开了一种二次铝灰固氟的无害化处理方法，属于危废无害化处理技术领域。该处理方法为：将去氮后的二次铝灰与水进行充分混合，得到含氟离子的混合液；在步骤(1)所得的含氟离子的混合液中加入羟基磷灰石，初反应生成氟磷灰石；在反应体系中加入醋酸溶液，持续反应生成氟磷灰石和去除