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

A technology for smelting flue gas and non-ferrous metals, which is applied in the direction of non-metallic elements, sulfur trioxide/sulfuric acid, sulfur compounds, etc., can solve the one-time investment and operation cost problems such as high power consumption, water consumption or steam consumption of desulfurizer, and achieve Low one-time investment and operating costs, reduced impurity content, and obvious effects

Inactive Publication Date: 2016-04-06
CINF ENG CO LTD
7 Cites 2 Cited by

AI-Extracted 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 ...
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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.

Application Domain

Sulfur-trioxide/sulfuric-acid

Technology Topic

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

Examples

  • Experimental program(2)

Example Embodiment

[0018] Example 1
[0019] This embodiment provides a process for producing high-quality sulfuric acid from non-ferrous metal smelting flue gas. The equipment used in the process is as follows, including a sulfuric acid decolorization reactor 1, a sulfuric acid storage tank 2, a sulfuric acid pump 3, a washing tower 4, and a cooler connected in sequence 5; The upper part of the scrubbing tower 4 is connected to the sulfuric acid pump 3 through a pipeline, the lower part of the scrubbing tower 4 is connected to the cooler 5 through a pipeline, and the lower part of the scrubbing tower 4 is also connected to the sulphuric acid tail gas pipe 7, which passes through The fan 6 is connected to the lower part of the washing tower 4; among them, the fan 6 is a booster fan, the washing tower 4 is a packed tower, the sulfuric acid storage tank 2 is a sulfuric acid underground storage tank, and the sulfuric acid decolorization reactor 1 is equipped with water inlet, acid inlet and Adding a decoloring agent port; the feed pipe and the discharge pipe of the sulfuric acid storage tank 2 are both provided with insulation layers, and the sulfuric acid decolorization reactor 1 is provided with an exhaust port, and the exhaust port is connected with the acid-making tail gas pipe 7.
[0020] Processing flow is 13m 3 /h of concentrated sulfuric acid with a mass concentration of 93.5%, the ash content does not meet the criteria for qualified products, and the transparency and chroma do not reach the first-class indicators; SO in dense smoke 2 The concentration is 600mg/m 3 Exceeding the limit of the current discharge standard, the process of the present invention is as follows: from the non-ferrous sulfuric acid produced in the dry absorption process, the advanced sulfuric acid decolorization reactor is then entered into the concentrated acid underground storage tank. To the scrubber, the packing layer and SO 2 The thick smoke (non-ferrous metal smelting flue gas sulphuric acid tail gas) countercurrent contact heat transfer and mass transfer reaction, flows out of the tower, is cooled by the concentrated acid cooler, and then sent to the sulfuric acid storage tank for storage; containing SO 2 The sulphuric acid tail gas self-drying and absorption process, the final absorption tower is boosted by a fan and sent to the washing tower. After being fully reacted with the concentrated sulfuric acid mixture sent from the concentrated acid underground tank from bottom to top in the tower, it is defoamed and acid removed at the top of the tower The mist device and chimney are discharged to the atmosphere.
[0021] After the operation of the device, various indicators of the sulfuric acid produced in this example have reached the first-class product (each indicator refers to GBT534-2014 industrial sulfuric acid), and the SO in the tail gas discharged from the chimney to the atmosphere 2 The concentration is far lower than the limit in the emission standard, which is 50mg/m 3 , The desulfurization rate is 91.7%, and no dense smoke is seen.

Example Embodiment

[0022] Example 2
[0023] Using the device of Example 1, the processing flow is 12m 3 /h of concentrated sulfuric acid with a mass concentration of 98.5%, the ash content does not meet the criteria for qualified products, and the transparency and chroma do not reach the first-class indicators; SO in the tail gas of acid production 2 The concentration is 450mg/m 3 , Exceeding the current emission standard limit.
[0024] After the operation of the device, the various indicators of the sulfuric acid produced in this example have reached the top grade, and the SO in the tail gas discharged from the chimney to the atmosphere 2 The concentration is far below the limit in the standard, which is 40mg/m 3 , The desulfurization rate is 91%, and no dense smoke is seen.
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Description & Claims & Application Information

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