CN1775682A - Method for preparing magnesium sulfite utilizing boiler flue gas - Google Patents
Method for preparing magnesium sulfite utilizing boiler flue gas Download PDFInfo
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- CN1775682A CN1775682A CN 200510127600 CN200510127600A CN1775682A CN 1775682 A CN1775682 A CN 1775682A CN 200510127600 CN200510127600 CN 200510127600 CN 200510127600 A CN200510127600 A CN 200510127600A CN 1775682 A CN1775682 A CN 1775682A
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- smoke
- magnesium sulfite
- desulfurization
- thionizer
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Abstract
The invention relates to a method for making magnesium sulfite using boiler smoke, and its processing flow: (1) grinding magnesium oxide powder or magnesite into powder, mixing with water to prepare an absorbing agent pulp and feeding the pulp into a desulfurizing tower; (2) leading the boiler smoke into a desulfurizing preprocessing device, spraying with circulating water, lowering the smoke temperature, eliminating part of smoke dust, HCl, HF, and SO3 components; (3) in the desulfurizing tower, making in-smoke SO2 react with the absorbing agent pulp to produce MgSO3, controlling the temperature in the desulfurizing tower at 50 deg.C-55 deg.C, where the pH value of the circulating pulp is in the intervals of 5.0-6.8; (4) feeding the desulfurized waste solution into a depositing tank and a centrifugal machine for separation and dehydration so as to raise the solid phase content up to 50%-70%; (5) drying by hot air and obtaining the dry magnesium sulfite finished products. The advantages of the invention: it provides a new method for producing desulfurization by-products by magnesium method. The magnesium sulfite products can be made into vitriol by burning.
Description
Technical field
The invention belongs to the preparation method of magnesium sulfite, particularly a kind of method of utilizing the Industrial Boiler discharged flue gas to produce solid-state magnesium sulfite.
Background technology
It is the country of main primary energy source with coal that China is one, and in the long period from now on, power industry can not change based on the energy structure of coal, and thermal power plant still generates electricity as main fuel with coal.Thermal power plant's Industrial Boiler discharged flue gas contains SO
2, flue dust and HCl, HF, SO
3Deng, very serious to the pollution of environment.Along with the increasing of China environmental protection dynamics, flue gas desulfurization technique is applied at home and develops.At present, in the flue gas desulfurization field, magnesium oxide obtains promoting comparatively widely as a kind of new sweetening agent.The wet type magnesium method flue gas desulphurization is to make desulfurization absorbent with light burned magnesia, in thionizer with contain SO
2Flue gas fully contact, react, generate the waste liquid be full of magnesium sulfite, flue gas obtains desulfurization.Magnesium method desulfurizer less investment, running cost is low, and sweetening effectiveness is good, but its by-product waste liquid should not directly discharge, and need carry out resource and reclaim.
Present flue gas desulfurization course utilizes the waste liquid of magnesium method desulfurization usually, produces sal epsom fertilizer through aeration.Because of also containing a spot of flue dust, HCl, HF, SO in the desulfurization waste liquor
3Deng, complicated component, flue dust in the flue gas and SO
2Send into thionizer together, enter absorption liquid and carry out desulfurization and dedusting, cause the desulfurization waste liquor complicated component, influential to the byproduct purity of utilizing waste liquid to produce.
Summary of the invention
The objective of the invention is, use the flue gas desulfurization pretreatment unit, spray recirculated water is removed flue dust, HCl, HF, SO in the flue gas earlier
3Deng composition, make the composition of desulfurization waste liquor simple.Suppress the magnesium sulfite oxidation in the desulfurization waste liquor again, make solid-liquid separation, the dry water content that generates of magnesium sulfite is lower than 10% the pure product of solid-state magnesium sulfite.Reach the sulfur in smoke resource recycling, reduce secondary pollution, simultaneously, magnesium sulfite can be used for making sulfuric acid.
Technical scheme of the present invention is, a kind of method of utilizing boiler smoke to produce magnesium sulfite comprises the sulfur in smoke absorption reaction, and to dehydrating of desulfurization waste liquor, its technical process is:
1. prepare absorption agent, send into ball mill with magnesia powder or with giobertite, grind to form 250-300 purpose powder, add water and be mixed with absorbent slurry, slurry solid content 20%-30% sends into thionizer,
2. flue gas impurity elimination is introduced the flue gas desulfurization pretreatment unit with boiler smoke, through the recirculated water spray, reduces flue-gas temperature, removes part flue dust, HCl, HF, SO
3Composition, the adjusting of the process water add-on by pretreatment unit guarantees the evaporated water of appropriateness, sends into thionizer,
3. absorption reaction, in thionizer, sulfur in smoke and absorbent slurry reaction generate MgSO
3Thereby, sulfur in smoke to be removed, temperature is at 50-55 ℃ in the control thionizer, and the loop slurry pH value is in the 5.0-6.8 interval,
4. separating and dehydrating is sent desulfurization waste liquor into settling tank, precipitate and separate, again through the whizzer separating and dehydrating, reach 50-70% with the solid load that improves in the liquid, send back to circulating water pool, continue on for desulfurization through isolated liquid phase part (its solid load is no more than 10%).
5. dry, the solid load after separating is reached the liquid of 50-70%, send into warm air drying tube drying, obtain the exsiccant magnesium sulfite, its water content is finished product less than 10%.
Advantage of the present invention is that China has abundant magnesium ore resources, suits to promote magnesium method desulfurization technology, the invention provides the production method of new magnesium method desulfurizing byproduct, is convenient to the popularization of magnesium method desulfurization technology more.Boiler smoke can be removed the partial impurities in the flue gas, thereby guarantee the quality of product magnesium sulfite through the water spray pre-treatment.The byproduct magnesium sulfite can be used as vitriol works's relieving haperacidity raw material, can make sulfuric acid.The present invention is applicable to that the Industrial Boiler flue gas desulphurization waste solution produces the method for magnesium sulfite.
Description of drawings
Fig. 1 is the technical process that utilizes boiler smoke to produce magnesium sulfite of the present invention.
Embodiment
As seen from Figure 1, a kind of method of utilizing boiler smoke to produce magnesium sulfite comprises the sulfur in smoke absorption reaction, and to dehydrating of desulfurization waste liquor, its technical process is:
1. prepare absorption agent, send into ball mill with magnesia powder or with giobertite, grind to form 250-300 purpose powder, add water and be mixed with absorbent slurry, slurry solid content 20%-30% sends into thionizer,
2. flue gas impurity elimination is introduced the flue gas desulfurization pretreatment unit with boiler smoke, through the recirculated water spray, reduces flue-gas temperature, removes part flue dust, HCl, HF, SO
3Composition, the adjusting of the process water add-on by pretreatment unit guarantees the evaporated water of appropriateness, sends into thionizer,
3. absorption reaction, in thionizer, sulfur in smoke and absorbent slurry reaction generate MgSO
3Thereby, sulfur in smoke to be removed, temperature is at 50-55 ℃ in the control thionizer, and the loop slurry pH value is in the 5.0-6.8 interval,
4. separating and dehydrating is sent desulfurization waste liquor into settling tank, precipitate and separate, again through the whizzer separating and dehydrating, reach 50-70% with the solid load that improves in the liquid, send back to circulating water pool, continue on for desulfurization through isolated liquid phase part (its solid load is no more than 10%).
5. dry, the solid load after separating is reached the liquid of 50-70%, send into warm air drying tube drying, obtain the exsiccant magnesium sulfite, its water content is finished product less than 10%.
Claims (2)
1, a kind of method of utilizing boiler smoke to produce magnesium sulfite comprises the sulfur in smoke absorption reaction to dehydrating of desulfurization waste liquor, be is characterized in that:
1. prepare absorption agent, giobertite is sent into ball mill, grind to form 250-300 purpose powder, add water and be mixed with absorbent slurry, slurry solid content 20%-30% sends into thionizer,
2. flue gas impurity elimination is introduced the flue gas desulfurization pretreatment unit with boiler smoke, through the recirculated water spray, reduces flue-gas temperature, removes part flue dust, HCl, HF, SO
3Composition, the adjusting of the process water add-on by pretreatment unit guarantees the evaporated water of appropriateness, sends into thionizer,
3. absorption reaction, in thionizer, sulfur in smoke and absorbent slurry reaction generate MgSO
3Thereby, sulfur in smoke to be removed, temperature is at 50-55 ℃ in the control thionizer, and the loop slurry pH value is in the 5.0-6.8 interval,
4. separating and dehydrating is sent desulfurization waste liquor into settling tank, precipitate and separate, again through the whizzer separating and dehydrating, reach 50-70% with the solid load that improves in the liquid, send back to circulating water pool, continue on for desulfurization through isolated liquid phase part (its solid load is no more than 10%).
5. dry, the solid load after separating is reached the liquid of 50-70%, send into warm air drying tube drying, obtain the exsiccant magnesium sulfite, its water content is finished product less than 10%.
2, the method for utilizing boiler smoke to produce magnesium sulfite as claimed in claim 1 is characterized in that, makes desulfurization absorbent with magnesia powder, sends into thionizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510127600 CN1775682A (en) | 2005-12-08 | 2005-12-08 | Method for preparing magnesium sulfite utilizing boiler flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510127600 CN1775682A (en) | 2005-12-08 | 2005-12-08 | Method for preparing magnesium sulfite utilizing boiler flue gas |
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| CN1775682A true CN1775682A (en) | 2006-05-24 |
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| CN 200510127600 Pending CN1775682A (en) | 2005-12-08 | 2005-12-08 | Method for preparing magnesium sulfite utilizing boiler flue gas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101628199A (en) * | 2008-07-17 | 2010-01-20 | 中国石化集团宁波工程有限公司 | Improved magnesium method flue gas desulphurization technique |
| CN103406014A (en) * | 2013-08-08 | 2013-11-27 | 常州联慧资源环境科技有限公司 | Method for controlling water expansion and increasing concentration of desulfurization product clear solution for magnesium method flue gas desulphurization system |
| CN105013317A (en) * | 2015-07-03 | 2015-11-04 | 赵亮 | Process flow for recovering high-purity magnesium sulfite by magnesium oxide flue gas desulphurization |
| CN107162028A (en) * | 2017-05-23 | 2017-09-15 | 常州联慧资源环境科技有限公司 | A kind of preparation method of magnesium sulfate monohydrate |
| CN108889099A (en) * | 2018-08-06 | 2018-11-27 | 山东艾凯恩环保工程有限公司 | A kind of circulation magnesium processes desulfurization of steam source and magnesium sulfate preparation system and method |
-
2005
- 2005-12-08 CN CN 200510127600 patent/CN1775682A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101628199A (en) * | 2008-07-17 | 2010-01-20 | 中国石化集团宁波工程有限公司 | Improved magnesium method flue gas desulphurization technique |
| CN103406014A (en) * | 2013-08-08 | 2013-11-27 | 常州联慧资源环境科技有限公司 | Method for controlling water expansion and increasing concentration of desulfurization product clear solution for magnesium method flue gas desulphurization system |
| CN103406014B (en) * | 2013-08-08 | 2015-10-28 | 常州联慧资源环境科技有限公司 | A kind of method of magnesium method flue gas desulphurization system water expansion control and desulfurization product clear liquid concentrate |
| CN105013317A (en) * | 2015-07-03 | 2015-11-04 | 赵亮 | Process flow for recovering high-purity magnesium sulfite by magnesium oxide flue gas desulphurization |
| CN107162028A (en) * | 2017-05-23 | 2017-09-15 | 常州联慧资源环境科技有限公司 | A kind of preparation method of magnesium sulfate monohydrate |
| CN108889099A (en) * | 2018-08-06 | 2018-11-27 | 山东艾凯恩环保工程有限公司 | A kind of circulation magnesium processes desulfurization of steam source and magnesium sulfate preparation system and method |
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