Resourceful Treatment Method of BOE Waste Liquid

A resourceful treatment method of BOE waste liquid, characterized by, comprising the following steps:

• S1, dissolving a sodium salt to obtain a sodium salt solution, adding the sodium salt solution to a BOE waste liquid for reaction for 30 min, and then filtering the reaction solution to obtain sodium fluosilicate and a first waste liquid;
• S2, dissolving an aluminum salt to obtain an aluminum salt solution, adding the aluminum salt solution to the first waste liquid, adjusting the pH of the first waste liquid to 4-7 by using a first pH adjuster, reacting same for 1-2 h and then filtering the reaction solution to obtain cryolite and a second waste liquid;
• S3, adding a fluorine removal agent and a heavy metal capturing agent to the second waste liquid for reaction for 30 min, and then filtering the reaction solution to obtain a first waste residue and a third waste liquid, and landfilling the first waste residue;
• S4, adding a second pH adjuster to the third waste liquid to adjust the pH of the third waste liquid to 2-4, subjecting the third waste liquid to evaporative crystallization to obtain evaporated condensate water and a concentrated solution, subjecting the evaporated condensate water to a biochemical treatment, and discharging the evaporated condensate water after same reaches the discharge standard;
• S5, pumping the concentrated solution into a cooling crystallization tank for cooling for 40° C., and subjecting same to centrifugal separation to obtain an ammonium salt and a final mother solution;
• and
• S6, returning the third waste liquid and the final mother solution to S1 and S2 for circulation so as to prepare the sodium salt solution and the aluminum salt solution.