Technology for preparing high-quality sulfuric acid from non-ferrous metal smelting flue gas

The invention discloses a technology for preparing high-quality sulfuric acid from non-ferrous metal smelting flue gas. The technology comprises the following steps that 1, the non-ferrous metal smelting flue gas is prepared into sulfuric acid through the steps of acid preparation and dry absorption; 2, the sulfuric acid prepared in the first step is introduced into a sulfuric acid decoloring reaction kettle, a decoloring agent and water are added for a decoloring reaction, the temperature of the decoloring reaction is controlled to range from 75 DEG C to 105 DEG C, and the time of the decoloring reaction ranges from 1 h to 6 h, wherein the decoloring agent is hydrogen peroxide of 27.5%-70%; 3, tailgas produced in the process of preparing acid from the non-ferrous metal smelting flue gas is introduced into a washing tower from the lower portion of the washing tower, sulfuric acid subjected to the decoloring reaction is introduced into the washing tower and sprayed out of the upper portion of the washing tower, the sulfuric acid subjected to the decoloring reaction and the tailgas produced in the process of preparing the acid from the non-ferrous metal smelting flue gas flow oppositely for a reaction in the washing tower, cooling is conducted after the reaction is completed, and the high-quality sulfuric acid is obtained. According to the technology, added chemical agents are few, the cost is low, the technological procedures are short, the technological process is simple, the occupied area of equipment is small, the applicability is high, and the one-time investment and operating cost is low.