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

Abstract

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.

Description

technical field [0001] The invention relates to a process for producing high-quality sulfuric acid from non-ferrous metal smelting flue gas. Background technique [0002] Sulfuric acid is one of the important basic chemical raw materials and an important product in the chemical industry. It is mainly used to manufacture inorganic chemical fertilizers, and secondarily as a basic chemical raw material. Used in non-ferrous smelting, petroleum refining and petrochemical industry, textile printing and dyeing, inorganic salt industry, certain inorganic and organic acids, rubber industry, paint industry, national defense and military industry, pesticide medicine, tanning, coking and other industrial sectors. Steel pickling. [0003] The raw materials for sulfuric acid production mainly include sulfur, pyrite, flue gas from non-ferrous metal smelting, gypsum, hydrogen sulfide and waste sulfuric acid. Pure sulfuric acid is a colorless, odorless, oily liquid. Industrial sulfuric ac...

AI Technical Summary

Problems solved by technology

Many acid-making plants have only added desulfurization devices, and more desulfurization processes use alkaline substances such as sodium hydroxide solution, milk of lime, zinc oxide, etc., or activated coke, ionic liquid, and organic amine solutions to remove the sulfur in the acid-making tail gas. SO 2 After absorption, it is desorbed and sent to make acid, but these methods have high one-time investment and operating costs such as desulfurization agent, electricity consumption, water consumption or steam consumption.

For the dense smoke emitted, there is no report yet to deal with it

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