CN1351898A - Process for treating waste gas containing SO2 - Google Patents
Process for treating waste gas containing SO2 Download PDFInfo
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- CN1351898A CN1351898A CN 01131520 CN01131520A CN1351898A CN 1351898 A CN1351898 A CN 1351898A CN 01131520 CN01131520 CN 01131520 CN 01131520 A CN01131520 A CN 01131520A CN 1351898 A CN1351898 A CN 1351898A
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- desulfurization
- zinc oxide
- znso
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- waste gas
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- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The present invention relates to a waste gas treatment and is especially the process of desulfurizing waste gas containing SO2 and reusing the desulfurized product. The treating process has high desulfurizing efficiency, not liable to scaling in the equipment, easy-to-control desulfurization, low investment, low cost, reusable desulfurizing agent and SO2, and no secondary pollution produced.
Description
Technical Field
The present invention relates to a method for treating exhaust gas, and more particularly to a method for desulfurizing an exhaust gas containing sulfur dioxide and reusing the desulfurization product.
Background
Lime and limestone are mostly adopted as desulfurizing agents in the wet treatment technology of sulfur dioxide-containing waste gas at home and abroad, and most of desulfurization products, calcium sulfite or calcium sulfate, are discarded, so that secondary pollution is often caused. The wet calcium method has the problems that equipment is easy to scale, and resources of a desulfurizing agent and sulfur dioxide cannot be recycled. In industry, sodium carbonate, magnesium oxide, ammonia and other substances are used for absorbing sulfur dioxide and recycling, but the absorbent has high cost, complex process or no market for byproducts, so the economic loss is large.
Disclosure of Invention
The invention aims to provide a method for carrying out desulfurization treatment on waste gas containing sulfur dioxide, which has the advantages of high desulfurization efficiency, low operation cost, desulfurizing agent and SO2Can be recycled.
The purpose of the invention is realized by the following ways: a process for treating the waste gas containing sulfur dioxide includes such steps as adding water to zinc oxide, pulping, contact reaction with sulfur dioxide in fume in absorption apparatusForming desulfurization product ZnSO3Or Zn (HSO)3)2The desulfurization product can be treated by the following three treatment methods: firstly, controlling the pH value of the desulfurization absorption end point to be less than 10.0 when a thermal decomposition process is adopted, and filtering the desulfurization slurry to obtain ZnSO3The slag is thermally decomposed to produce ZnO and high-concentration SO2(ii) a Secondly, when the desulfurization product adopts an acid decomposition process, controlling the pH value of the desulfurization absorption end point to be less than 10.0, adding an acid solution into the desulfurization slurry for acid decomposition to produce high-concentration SO2And ZnSO4A solution; thirdly, when the desulfurization product adopts the oxidation process, controlling the pH value of the desulfurization absorption end point to be less than 10.0, and oxidizing the desulfurization product by air, oxygen or other oxidizing substances in an oxidizing device to produceOut of ZnSO4And (3) solution.
The zinc oxide-containing material mentioned may be a zinc oxide powder or a zinc oxide-containing powder.
The invention is a wet-type desulfurization technology by a recovery method, hashigh desulfurization efficiency, is not easy to scale, is simple and convenient to operate, has low investment and low operating cost, and can recycle the desulfurizing agent and sulfur dioxide without generating secondary pollution.
Detailed Description
The invention uses the serous fluid containing zinc oxide material and SO in flue gas in absorption equipment2Reaction, SO in the flue gas2Mainly in the form of zinc sulfite sediment and can be comprehensively utilized. The desulfurized product can be used for producing high-concentration SO by thermal decomposition and acid decomposition methods2Recycling, and simultaneously regenerating zinc oxide or producing zinc sulfate, metal zinc and other products; it can also be used for preparing zinc sulfate, zinc metal, etc. by oxidation process
The main chemical reaction process of the desulfurization is as follows: firstly, adding water into a material containing zinc oxide for pulping, and then contacting and reacting with sulfur dioxide in flue gas in proper absorption equipment to generate ZnSO3·5/2H2And O enters the sediment, and the reaction formula is as follows:
when the amount of ZnO remaining in the slurry is small, desulfurization reactions occur according to the following formulae (2) and (3) in addition to formula (1):
although Zn (HSO) produced by formula (2)3)2Is soluble, but due to the neutralization of formula (3), soluble Zn (HSO) in the desulfurized serum3)2The amount of (A) is small.
With the ZnO in the slurry being basically exhausted, the reaction shown in the formula (3) is stopped, and the reaction shown in the formula (2) is mainly carried out, wherein Zn (HSO) in the desulfurization clear liquid3)2The concentration rises rapidly, and the pH value and the desulfurization efficiency both drop rapidly.
When the desulfurization product adopts the thermal decomposition process, the pH value of the desulfurization absorption end point is controlled to be 7.5, so that the desulfurization product mainly contains ZnSO3·5/2H2And O enters the sediment. After the desulfurization product is filtered, the zinc sulfite slag is sent to a zinc concentrate fluidized bed roaster or a rotary kiln for thermal decomposition, and the regenerated zinc sulfite slag is regeneratedZnO and high concentration SO2And (4) recycling. The thermal decomposition reaction is as follows:
when the desulfurization product is subjected to acid decomposition, controlling the pH value of the desulfurization absorption end point to be 6.5, and adding a sulfuric acid-containing solution or a waste acid solution (such as electrolytic waste liquid of electrolytic zinc) into a decomposition device to carry out acid decomposition on the desulfurization product to produce high-concentration SO2And zinc sulfate or further zinc metal is electrolyzed. The acid decomposition reaction is as follows:
when the desulfurization product adopts an oxidation process, controlling the pH value of the desulfurization absorption end point to be 5.5, and oxidizing the desulfurization product by using air or oxygen in oxidation equipment to produce a zinc sulfate product or further electrolyze metal zinc. The oxidation reaction is as follows:
the invention is suitable for the flue gas desulfurization engineering with sufficient zinc oxide material sources, in particular to the flue gas desulfurization of lead-zinc smelting enterprises; if the thermal decomposition process is adopted to recover the desulfurization product, the invention is also suitable for other flue gas desulfurization projects, and the zinc oxide can be recycled.
Claims (2)
1. A process for treating the waste gas containing sulfur dioxide includes such steps as adding water to zinc oxide, pulping, contact reaction with sulfur dioxide in fume in absorption apparatus to obtain ZnSO product3Or Zn (HSO)3)2The desulfurization product can be treated by the following three treatment methods: firstly, controlling the pH value of the desulfurization absorption end point to be less than 10.0 when a thermal decomposition process is adopted, and filtering the desulfurization slurry to obtain ZnSO3The slag is thermally decomposed to produce ZnO and high-concentration SO2(ii) a Secondly, when the desulfurization product adopts an acid decomposition process, controlling the pH value of the desulfurization absorption endpoint to be less than 10.0, adding an acid solution into the desulfurization slurry for acid decomposition to produce high-concentration SO2And ZnSO4A solution; thirdly, when the desulfurization product adopts an oxidation process, controlling the pH value of the desulfurization absorption end point to be less than 10.0, oxidizing the desulfurization product by using air, oxygen or other oxidizing substances in an oxidation device to produce ZnSO4And (3) solution.
2. A method as claimed in claim 1, characterized in that the material containing zinc oxide is zinc oxide powder or zinc oxide powder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01131520 CN1351898A (en) | 2001-11-02 | 2001-11-02 | Process for treating waste gas containing SO2 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01131520 CN1351898A (en) | 2001-11-02 | 2001-11-02 | Process for treating waste gas containing SO2 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1351898A true CN1351898A (en) | 2002-06-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01131520 Pending CN1351898A (en) | 2001-11-02 | 2001-11-02 | Process for treating waste gas containing SO2 |
Country Status (1)
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| CN (1) | CN1351898A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102008886A (en) * | 2010-11-22 | 2011-04-13 | 浙江双屿实业有限公司 | Zinc oxide wet turbulent washing flue gas desulfurization device and process |
| CN102423622A (en) * | 2011-10-21 | 2012-04-25 | 中国恩菲工程技术有限公司 | Zinc oxide desulfuration technology |
| CN102500215A (en) * | 2011-11-16 | 2012-06-20 | 来宾华锡冶炼有限公司 | Method for treating unsteady sulfur dioxide flue gas |
| CN102652895A (en) * | 2012-05-08 | 2012-09-05 | 杭州三耐环保科技有限公司 | Method for recovering sulfur dioxide in flue gas |
| CN102755826A (en) * | 2012-07-06 | 2012-10-31 | 江苏恒丰伟业科技工程有限公司 | Tail gas desulfuration adopting zinc oxide method in smelting industry |
| CN103203171A (en) * | 2012-01-12 | 2013-07-17 | 北京化工大学 | Technology for removing SO2 in smoke through recovery method |
| CN103908887A (en) * | 2014-04-04 | 2014-07-09 | 泰兴电除尘设备厂有限公司 | Additive for zinc oxide slurry for flue gas desulfurization |
| CN107376594A (en) * | 2017-09-07 | 2017-11-24 | 湖南三立集团股份有限公司 | A kind of method that sulfur dioxide is reclaimed from flue gas |
| CN107663584A (en) * | 2017-08-18 | 2018-02-06 | 西北矿冶研究院 | Treatment process of desulfurization slag of zinc oxide method desulfurization process |
-
2001
- 2001-11-02 CN CN 01131520 patent/CN1351898A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102008886A (en) * | 2010-11-22 | 2011-04-13 | 浙江双屿实业有限公司 | Zinc oxide wet turbulent washing flue gas desulfurization device and process |
| CN102008886B (en) * | 2010-11-22 | 2012-07-18 | 浙江双屿实业有限公司 | Zinc oxide wet turbulent washing flue gas desulfurization device and process |
| CN102423622A (en) * | 2011-10-21 | 2012-04-25 | 中国恩菲工程技术有限公司 | Zinc oxide desulfuration technology |
| CN102500215A (en) * | 2011-11-16 | 2012-06-20 | 来宾华锡冶炼有限公司 | Method for treating unsteady sulfur dioxide flue gas |
| CN103203171A (en) * | 2012-01-12 | 2013-07-17 | 北京化工大学 | Technology for removing SO2 in smoke through recovery method |
| CN102652895A (en) * | 2012-05-08 | 2012-09-05 | 杭州三耐环保科技有限公司 | Method for recovering sulfur dioxide in flue gas |
| CN102755826A (en) * | 2012-07-06 | 2012-10-31 | 江苏恒丰伟业科技工程有限公司 | Tail gas desulfuration adopting zinc oxide method in smelting industry |
| CN102755826B (en) * | 2012-07-06 | 2014-11-12 | 江苏恒丰伟业科技工程有限公司 | Tail gas desulfuration adopting zinc oxide method in smelting industry |
| CN103908887A (en) * | 2014-04-04 | 2014-07-09 | 泰兴电除尘设备厂有限公司 | Additive for zinc oxide slurry for flue gas desulfurization |
| CN107663584A (en) * | 2017-08-18 | 2018-02-06 | 西北矿冶研究院 | Treatment process of desulfurization slag of zinc oxide method desulfurization process |
| CN107376594A (en) * | 2017-09-07 | 2017-11-24 | 湖南三立集团股份有限公司 | A kind of method that sulfur dioxide is reclaimed from flue gas |
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