CN101428194A - Method for inhibiting reduction release of Hg<2+> in flue gas desulfurization liquid - Google Patents
Method for inhibiting reduction release of Hg<2+> in flue gas desulfurization liquid Download PDFInfo
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- CN101428194A CN101428194A CNA2008101622092A CN200810162209A CN101428194A CN 101428194 A CN101428194 A CN 101428194A CN A2008101622092 A CNA2008101622092 A CN A2008101622092A CN 200810162209 A CN200810162209 A CN 200810162209A CN 101428194 A CN101428194 A CN 101428194A
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- flue gas
- gas desulfurization
- desulfurization liquid
- mercury
- liquid
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Abstract
The invention relates to a method for restraining Hg<2+> in flue gas desulphurization liquid from restoring and releasing. The prior method has poor mercury-removal effects and intends to cause secondary pollution of coal-fired flue gas mercury. The method provided by the invention is characterized in that Hg<2+> in the flue gas desulphurization liquid reacts with iron pyrites to produce stable chelate which is then separated from the flue gas desulphurization liquid. Specifically, the method comprises the following steps: powdery iron pyrites are directly added into the flue gas desulphurization liquid and stirred for 1-2 hours; or the flue gas desulphurization liquid is input into a filter bed which takes lump iron pyrites as filler, and kept therein for 10-20 hours. The method provided by the invention has the advantages of effectively restraining Hg<2+> in the flue gas desulphurization liquid from restoring and releasing, being capable of making the best of the wet-type desulphurization technology for synchronous mercury-removal, and effectively solving the problem of mercury contamination as a result of the emission of coal-fired flue gas.
Description
Technical field
The invention belongs to field of environment engineering technology, relate to Hg in a kind of inhibition flue gas desulfurization liquid
2+The method that reduction discharges.
Background technology
Coal burning is the one of the main reasons that causes mercury emissions, and mercury has become the coal-fired atmosphere pollution that must preferentially be controlled.The coal-fired consumption of China is big, the coal mercury content is higher (on average at 0.15-0.2mg/kg, wherein in the coal of part south China the mercury average content up to 0.48mg/kg), the therefore coal-fired mercury emission that is produced is very high, causes domestic mercury pollution problem to become increasingly conspicuous.Mercury in the coal-fired flue-gas is often with gaseous state nonvalent mercury (Hg
0), gaseous state divalence mercury (Hg
2+) and particle mercury (Hg
P, referring to attached to the mercury on the particle) and three kinds of forms exist.Wherein, owing to can very easily cause global mercury pollution at the medium-term and long-term stable existence of atmosphere after the nonvalent mercury discharging by Atmospheric Diffusion.
In the research that utilizes the existing smoke eliminator removal of mercury, what paid close attention to most is to utilize existing dedusting or desulfurizer to carry out the removal of mercury.With regard to the present economy of China and the state of the art, because the operating cost of active carbon spraying technique is too high, and influences recovery and Utilization of Coal Ash, this technology is promoted in China and is acquired a certain degree of difficulty; In view of the present sulfur dioxide pollution situation of China is more serious, wet process of FGD technology (WFGD) will have higher popularity rate at a few years from now on.For reducing removal of mercury cost, make full use of the Comprehensive Control Technology that the wet desulphurization technology is carried out the synchronous removal of mercury, should be one of main developing direction of China.
Wet desulphurization device has been obtained more widely in developed country and has been used, and therefore from economic considerations, utilizes the research of the WFGD removal of mercury also to be subjected to special concern.The result shows that WFGD is in most of the cases to the Hg in the flue gas
2+Higher absorption efficiency is arranged, utilize the synchronous removal of mercury of this technology to be considered to one of most economical mercury pollution control method (operating cost only is the 30-50% of ACI method).But existing following two problems of this method at present: at first,, cause the removal effect of nonvalent mercury relatively poor because nonvalent mercury is insoluble in the doctor solution; Secondly, absorb the Hg in the doctor solution
2+Can form compound with wherein tetravalence sulphur S (IV) effect, the decomposition of this compound and be reduced to the Hg that is insoluble in water
0, because Hg
0Volatile and turn back to once more in the flue gas, cause the secondary pollution of coal-fired flue-gas mercury.
Therefore, the secondary pollution problem of mercury in doctor solution or desulfurizing byproduct that enters in the doctor solution also must be controlled, and filters out the comparatively superior Hg of combination property
2+Stabilizing agent impels the Hg in the doctor solution
2+Form stable chelate, and from doctor solution precipitate and separate, can effectively solve Hg
2+Reduction release in doctor solution and secondary pollution problem.
Summary of the invention
Purpose of the present invention just provides Hg in a kind of inhibition flue gas desulfurization liquid
2+The method that reduction discharges.
The inventive method is by Hg in the flue gas desulfurization liquid
2+With the pyrite effect, form stable chelate, from flue gas desulfurization liquid, separate.Concrete grammar is:
1) in flue gas desulfurization liquid, directly adds powdery pyrite, stirred 1～2 hour; Pyritous dosage is to add 0.8～1.2g in every liter of flue gas desulfurization liquid; Or
2) flue gas desulfurization liquid is fed with the filter bed of block pyrite as filler, stopped 10～20 hours.
Above-mentioned two kinds of methods all can effectively suppress Hg in the flue gas desulfurization liquid
2+Reduction discharge.
Advantage of the present invention is:
1, pyrite and Hg
2+Effectively combination, Hg
2+Be fixed and discharge with desulfurization slag;
2, can effectively suppress Hg in the flue gas desulfurization liquid
2+Reduction and discharge once more;
3, can make full use of the wet desulphurization technology and carry out the synchronous removal of mercury, effectively solve the mercury pollution problem that the coal-fired flue-gas discharging is caused.
The specific embodiment
Embodiment 1:
Ratio according to every liter of flue gas desulfurization liquid 1.0g adds powdery pyrite (〉=40 order), to Hg
2+Content is flue gas desulfurization liquid (50 ℃ of temperature, the Cl of 0.1mg/L
-Concentration 100mM, pH5.0) handle stirring reaction 1.5 hours, Hg
2+Precipitation remove and to reach 88.5%.
Embodiment 2:
Ratio according to every liter of flue gas desulfurization liquid 1.2g adds powdery pyrite (〉=40 order), to Hg
2+Content is flue gas desulfurization liquid (50 ℃ of temperature, the Cl of 0.12mg/L
-Concentration 100mM, pH5.0) handle stirring reaction 2 hours, Hg
2+Precipitation remove and to reach 93.2%.
Embodiment 3:
Ratio according to every liter of flue gas desulfurization liquid 0.8g adds powdery pyrite (〉=40 order), to Hg
2+Content is flue gas desulfurization liquid (50 ℃ of temperature, the Cl of 0.08mg/L
-Concentration 100mM, pH5.0) handle stirring reaction 1 hour, Hg
2+Precipitation remove and to reach 86.3%.
Embodiment 4:
With Hg
2+Content is that the flue gas desulfurization liquid of 0.12mg/L passes through to stop Hg in the flue gas desulfurization liquid 15 hours with the filter bed of block pyrite as filler
2+Clearance reach about 91%.
Embodiment 5:
With Hg
2+Content is that the flue gas desulfurization liquid of 0.1mg/L passes through to stop Hg in the flue gas desulfurization liquid 10 hours with the filter bed of block pyrite as filler
2+Clearance reach about 85%.
Embodiment 6:
With Hg
2+Content is that the flue gas desulfurization liquid of 0.08mg/L passes through to stop Hg in the flue gas desulfurization liquid 20 hours with the filter bed of block pyrite as filler
2+Clearance reach more than 96%.
Claims (3)
1, suppresses Hg in the flue gas desulfurization liquid
2+The method that reduction discharges is characterized in that this method is by Hg in pyrite and the flue gas desulfurization liquid
2+Effect forms stable chelate, with Hg
2+From flue gas desulfurization liquid, separate.
2, Hg in the inhibition flue gas desulfurization liquid as claimed in claim 1
2+The method that reduction discharges is characterized in that Hg in described pyrite and the flue gas desulfurization liquid
2+Effect is directly to add powdery pyrite in flue gas desulfurization liquid, stirs 1～2 hour; Pyritous dosage is to add 0.8～1.2g in every liter of flue gas desulfurization liquid.
3, Hg in the inhibition flue gas desulfurization liquid as claimed in claim 1
2+The method that reduction discharges is characterized in that Hg in described pyrite and the flue gas desulfurization liquid
2+Effect is that flue gas desulfurization liquid is fed with the filter bed of block pyrite as filler, stops 10～20 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101622092A CN101428194A (en) | 2008-11-27 | 2008-11-27 | Method for inhibiting reduction release of Hg<2+> in flue gas desulfurization liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101622092A CN101428194A (en) | 2008-11-27 | 2008-11-27 | Method for inhibiting reduction release of Hg<2+> in flue gas desulfurization liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101428194A true CN101428194A (en) | 2009-05-13 |
Family
ID=40643959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008101622092A Pending CN101428194A (en) | 2008-11-27 | 2008-11-27 | Method for inhibiting reduction release of Hg<2+> in flue gas desulfurization liquid |
Country Status (1)
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| CN (1) | CN101428194A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688677A (en) * | 2012-06-12 | 2012-09-26 | 上海交通大学 | Method for enhancing total mercury recovery rate of metallurgical fume by reducing bivalent mercury |
| CN103285711A (en) * | 2013-05-28 | 2013-09-11 | 中南大学 | Method for purifying and recovering mercury in off gas |
-
2008
- 2008-11-27 CN CNA2008101622092A patent/CN101428194A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688677A (en) * | 2012-06-12 | 2012-09-26 | 上海交通大学 | Method for enhancing total mercury recovery rate of metallurgical fume by reducing bivalent mercury |
| CN102688677B (en) * | 2012-06-12 | 2014-08-20 | 上海交通大学 | Method for enhancing total mercury recovery rate of metallurgical fume by reducing bivalent mercury |
| CN103285711A (en) * | 2013-05-28 | 2013-09-11 | 中南大学 | Method for purifying and recovering mercury in off gas |
| CN103285711B (en) * | 2013-05-28 | 2015-05-06 | 中南大学 | Method for purifying and recovering mercury in off gas |
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Open date: 20090513 |