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A method for flue gas desulfurization of lead-zinc smelting with low sulfur dioxide concentration

A sulfur dioxide and smelting flue gas technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of difficult recovery and treatment of sodium sulfate and sodium sulfite waste liquid, difficult digestion and treatment of lime slag, high cost, etc., to achieve Significant economic and social benefits, low cost, and improved utilization

Active Publication Date: 2017-01-25
河南金利金铅集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The reduction furnace, fuming furnace, rotary kiln and other smelting furnaces involved in the lead-zinc smelting process will produce low-concentration sulfur dioxide flue gas during smelting. At present, the lime method is used for flue gas desulfurization, which produces a large amount of lime residue that is difficult to digest. The cost is high, and the waste liquid of sodium sulfate and sodium sulfite is difficult to recycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: A method for flue gas desulfurization of lead-zinc smelting with low sulfur dioxide concentration, the detailed steps are as follows:

[0020] a. The concentration of sulfur dioxide from the lead reduction furnace is 3g / m 3 , the flue gas volume is 30000Nm 3 / h smelting flue gas is cooled by waste heat boiler, and then dust is removed by bag filter. After dust removal, the dust concentration is controlled to 7 g / m 3 ;

[0021] b. Pass part of the smelting flue gas with low sulfur dioxide concentration after dust removal into the spray tower, and use hydrogen peroxide to spray in the spray tower. According to the design manual, the diameter of the spray tower is determined by the flue gas flow rate, and the flue gas flow rate is generally 3-5m / s, the flue gas flow rate in the present invention is 4m / s, so the larger the flue gas flow rate, the larger the diameter of the spray tower; the spray volume of hydrogen peroxide is selected according to the flue g...

Embodiment 2

[0024] A method for desulfurizing flue gas from lead-zinc smelting with low sulfur dioxide concentration, the detailed steps are as follows:

[0025] a. Set the concentration of sulfur dioxide from the fuming furnace to 1g / m 3 , the flue gas volume is 50000Nm 3 / h smelting flue gas is cooled by waste heat boiler, and then dust is removed by bag filter. After dust removal, the dust concentration is controlled to 2 g / m 3 ;

[0026] b. Pass part of the smelting flue gas with low sulfur dioxide concentration after dust removal into the spray tower, and use hydrogen peroxide to spray in the spray tower. According to the design manual, the diameter of the spray tower is determined by the flue gas flow rate, and the flue gas flow rate is generally 3-5m / s, the flue gas flow rate in the present invention is 4m / s, so the larger the flue gas flow rate, the larger the diameter of the spray tower; the spray volume of hydrogen peroxide is selected according to the flue gas volume, general...

Embodiment 3

[0029] A method for desulfurizing flue gas from lead-zinc smelting with low sulfur dioxide concentration, the detailed steps are as follows:

[0030] a. Set the concentration of sulfur dioxide from the rotary kiln to 6g / m 3 , the flue gas volume is 80000Nm 3 The smelting flue gas per hour is cooled by the surface cooler, and then dust is removed by the bag filter. According to the composition of the dust, the concentration of the dust after dust removal is controlled to 11 g / m 3 ;

[0031] b. Pass part of the smelting flue gas with low sulfur dioxide concentration after dust removal into the spray tower, and use hydrogen peroxide to spray in the spray tower. According to the design manual, the diameter of the spray tower is determined by the flue gas flow rate, and the flue gas flow rate is generally 3-5m / s, the flue gas flow rate in the present invention is 4m / s, so the larger the flue gas flow rate, the larger the diameter of the spray tower; the spray volume of hydrogen p...

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PUM

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Abstract

The invention discloses a desulfurization method for lead / zinc smelting flue gas with low-concentration sulfur dioxide. The desulfurization method comprises the following steps: cooling lead / zinc smelting flue gas with low-concentration sulfur dioxide, performing partial dust removal, spraying by adopting hydrogen peroxide after dust removal, and collecting and stirring the spraying solution; and performing solid-liquid separation by using a filter press, returning filtrate and performing cycle desulfurization, so that the filtrate can be used for producing zinc sulfate or electrolytic zinc after reaching a certain concentration, and filter residues are used for smelting lead. According to the invention, low-concentration sulfur dioxide in the flue gas can be effectively removed under the condition that the investment is low, secondary pollution is avoided, the enterprise benefits are increased, and the method has obvious economic benefits.

Description

technical field [0001] The present invention relates to a method for desulfurization of low sulfur dioxide concentration smelting flue gas produced in the lead-zinc industry, in particular to a method for desulfurizing low sulfur dioxide concentration lead-zinc smelting flue gas produced by reduction furnaces, fuming furnaces, rotary kilns and other smelting furnaces method. Background technique [0002] The reduction furnace, fuming furnace, rotary kiln and other smelting furnaces involved in the lead-zinc smelting process will produce low-concentration sulfur dioxide flue gas during smelting. At present, the lime method is used for flue gas desulfurization, which produces a large amount of lime residue that is difficult to digest. The cost is high, and the waste liquid of sodium sulfate and sodium sulfite produced is also difficult to recycle. [0003] At present, with the increasingly severe environmental protection situation, the country and the people have higher and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50B01D53/75
Inventor 吕利光卢一富张义民姬宏图
Owner 河南金利金铅集团有限公司