Deep oxidation method of flue gas ammonia-acid process desulfurization tail gas absorption liquid

The invention relates to a flue gas ammonia-acid process desulfurization tail gas absorption liquid deep oxidation method, which comprises: S1, adding concentrated sulfuric acid to an absorption solution obtained by ammonia process desulfurization to carry out an oxidation reaction, and oxidizing a part of nitrite and ammonium thiosulfate in a mother solution into ammonium sulfate under the condition of controlling no sulfur generation; s2, ozone is introduced into the solution obtained after concentrated sulfuric acid oxidation treatment in the step 1 for deep oxidation, residual nitrite and ammonium thiosulfate in the solution are converted into ammonium sulfate, and a treated solution is obtained; and S3, neutralizing the solution treated in the step 2, and carrying out evaporative crystallization to produce ammonium sulfate. According to the method, the residual nitrite and ammonium thiosulfate in the solution are deeply oxidized into ammonium sulfate by utilizing the ozone oxidant, so that the aim of eff