Method for reducing content of burning residues of ammonium bifluoride

The invention belongs to the field of halides of ammonium, and particularly relates to a method for reducing the content of firing residues of ammonium bifluoride. The method comprises the following steps: (1) adding excessive fluosilicic acid or ammonium fluosilicate into an ammonium fluoride solution or ammonium bifluoride mother liquor for producing ammonium bifluoride to carry out precipitation reaction, and separating out precipitate to obtain first filtrate; the ammonium bifluoride mother liquor is a solution obtained after crystals are separated in the process of preparing ammonium bifluoride through concentration and crystallization of an ammonium fluoride solution; (2) adding ammonia into the first filtrate obtained in the step (1) to carry out ammoniation treatment, and separating out a silicon dioxide filter cake to obtain second filtrate; and (3) concentrating and crystallizing the second filtrate to prepare ammonium bifluoride. According to the method, the same ion effect is formed by adding exce