CN102001633A - Method for preparing sulfuric acid by using mixture containing magnesium sulfite as raw material - Google Patents
Method for preparing sulfuric acid by using mixture containing magnesium sulfite as raw material Download PDFInfo
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- CN102001633A CN102001633A CN2009100342188A CN200910034218A CN102001633A CN 102001633 A CN102001633 A CN 102001633A CN 2009100342188 A CN2009100342188 A CN 2009100342188A CN 200910034218 A CN200910034218 A CN 200910034218A CN 102001633 A CN102001633 A CN 102001633A
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Abstract
The invention belongs to the technical field of chemical industry of sulfuric acid preparation by a sulphur-containing solid mixture roasting method. In the invention, a dried magnesium sulfite mixture obtained after magnesium method desulfuration is used as a raw material, an added heat source and air are used for heating to roast and decompose the raw material to obtain roasted dregs mainly containing magnesium oxide and sulfur dioxide gas; MgO is used as a desulfurizing agent for recycling; and industrial grade sulfuric acid is prepared through the processes of afterheat recovery, dry dust collection, wet purification as well as double-rotation and double-absorption on the gas containing the SO2. The method greatly reduces the running cost of magnesium method desulfuration, has standard exhaust emission and can generate considerable economic benefit while treating pollution so as to realize circular economy.
Description
Technical field: the invention belongs to sulfur-containing solid mixture roasting legal system sulfation worker technical field, being specifically related to a kind of is that raw material is produced the vitriolic method with the mixture that contains magnesium sulfite.
Background technology: according to statistics, sulfurous gas year is discharged about 2,500 ten thousand tons because of what power station, Industrial Stoves, incinerator fire coal produced by China, ranks first in the world.It is the national environmental protection laws and regulations requirement that desulfurization is carried out in smoke evacuation, about 10,000,000,000 yuan of annual marketable value.Using comparatively sophisticated desulfurization technology at present on the flue gas desulfurization market has kind more than 20, and wherein magnesium oxide method wet flue gas desulfurization technology is exactly both economical practicality and a kind of desulfurization method with bright market prospects.The magnesium oxide sulfur removal technology originates from the Japan and the U.S. the earliest, its ripening degree is only second to the sulfur removal technology of calcium method, very many application achievements are all arranged all over the world, wherein used more than 100 project in Japan, the power station in Taiwan 95% is to use magnesium oxide method, all used on the U.S., Germany and other places in addition, and the achievement of using has been arranged in China some areas at present.
Studies show that, magnesium oxide method wet flue gas desulfurization technology desulfuration efficiency height, infrastructure investment and running cost are relatively low, will have boundless market outlook in China.This technology is promoted in China in U.S.'s industrialization, just still lacks the application achievement of large power plant.
Summary of the invention: purpose of the present invention be exactly propose a kind of utilize that magnesium method sulfur removal technology produced to contain magnesium sulfite (MgSO
3) be that main by product is that raw material is produced the vitriolic method.
Through roasting, decomposite MgO and SO
2MgO can be used as sweetening agent and recycles, and greatly reduces the running cost of magnesium method desulfurization, and SO
2Then be used for contact process and produce sulfuric acid, the tail gas qualified discharge can produce considerable economic again when administering pollution, realize recycling economy.
The present invention be by magnesium method sulfur removal technology is produced with magnesium sulfite (MgSO
3) be that main by product adopts thermal source (as coke, Sweet natural gas, coal gas etc.) to heat to make its decomposition, generate MgO and contain SO
2Gas.MgO can be used as the sweetening agent reuse; Contain SO
2Gas through waste heat recovery, dry method gather dust, wet purification, double conversion and double absorption explained hereafter technical grade sulfuric acid.
The present invention is achieved like this: being raw material from the magnesium sulfite mixture behind the magnesium method desulfurizing and drying, thermal source that adds and air heat decomposes its roasting, and the control maturing temperature is 600～950 ℃, decompose through roasting, mainly contained magnesian roasting slag, generated sulfur dioxide gas simultaneously; MgO is as the sweetening agent reuse; Contain SO
2Gas through waste heat recovery, dry method gather dust, wet purification, double conversion and double absorption technology produce technical grade sulfuric acid.
General ground the present invention is applicable to and contains the mixture of magnesium sulfite weight percent greater than 40% (butt).Through super-dry (moisture content≤10%) and broken after (granularity≤5mm) contain the magnesium sulfite mixture, send in the fluidizing furnace by reinforced belt, be equipped with an amount of fuel (as coke, Sweet natural gas, coal gas etc.) again and send into the stove from furnace bottom with gas blower extraction air in certain amount simultaneously.The control maturing temperature is 600～950 ℃, and calcination atmosphere is the weak oxide roasting.The roasting slag that generates is packed as the sweetening agent product with cooling drum cooling back and is sold.The sulfur dioxide in flue gas concentration of discharging from furnace roof is 8～18%, mend an amount of air with the after-flame inflammable gas, reclaim heat through waste heat boiler again, cyclone dust removal and electric precipitation dry method are gathered dust, dynamic wave scrubber (or venturi scrubber with internal injection or void tower), packing tower and electrostatic precipitator sealing acid-scrubbing cleaning, double conversion and double absorption explained hereafter technical grade sulfuric acid.
The inventive method greatly reduces the running cost of magnesium method desulfurization, and the tail gas qualified discharge can produce considerable economic again when administering pollution, realize recycling economy.
Embodiment: the present invention is described in detail below in conjunction with embodiment.
Embodiment: be raw material to contain magnesium sulfite greater than the mixture of 40% (butt) in the present embodiment, through super-dry (water content≤10%) and broken after (granularity≤5mm) contain the magnesium sulfite mixture, send in the fluidizing furnace by reinforced belt, be equipped with an amount of fuel (as coke, Sweet natural gas, coal gas etc.) again and send into the stove from furnace bottom with gas blower extraction air in certain amount simultaneously.The control maturing temperature is 600～950 ℃, and calcination atmosphere is the weak oxide roasting.The roasting slag that generates is packed as the sweetening agent product with cooling drum cooling back and is sold.The sulfur dioxide in flue gas concentration of discharging from furnace roof is 8～18%, mends an amount of air with the after-flame inflammable gas, and the size of air capacity realizes by oxygen table control sulfurous gas main air blower.Reclaim heat through waste heat boiler again, cyclone dust removal and electric precipitation dry method are gathered dust, dynamic wave scrubber (or venturi scrubber with internal injection or void tower), packing tower and electrostatic precipitator sealing acid-scrubbing cleaning, double conversion and double absorption explained hereafter technical grade sulfuric acid.
Claims (7)
1. one kind is that raw material is produced the vitriolic method with the mixture that contains magnesium sulfite, it is characterized in that being raw material from the magnesium sulfite mixture behind the magnesium method desulfurizing and drying, utilize thermal source and air to heat its roasting is decomposed, and the control maturing temperature is 600～950 ℃, decompose through roasting, mainly contained magnesian roasting slag, generated sulfur dioxide gas simultaneously; MgO recycles as sweetening agent; Contain SO
2Gas through waste heat recovery, dry method gather dust, wet purification, double conversion and double absorption technology produce technical grade sulfuric acid.
2. according to the described vitriolic method of producing of claim 1, it is characterized in that containing in the mixture of magnesium sulfite magnesium sulfite dry basis amount percentage composition greater than 40%.
3. according to the described vitriolic method of producing of claim 1, it is characterized in that the thermal source that utilizes is coke, Sweet natural gas or coal gas.
4. according to the described vitriolic method of producing of claim 1, it is characterized in that the thermal degradation process realizes by fluidizing furnace.
5. according to claim 1 or the 4 described vitriolic methods of producing, it is characterized in that the roasting slag that comes out from the fluidizing furnace overflow port is to come refrigerative with cooling drum.
6. according to the described vitriolic method of producing of claim 1, what it is characterized in that coming out from the fluidizing furnace top contains sulfur dioxide flue gas and need mend into air with the after-flame inflammable gas, and the size of air capacity realizes by oxygen table control sulfurous gas main air blower.
7. according to the described vitriolic method of producing of claim 6, the sulfur dioxide flue gas that contains that it is characterized in that the after-flame inflammable gas reclaims heat through waste heat boiler again, cyclone dust removal and electric precipitation dry method are gathered dust, dynamic wave scrubber or venturi scrubber with internal injection or void tower, packing tower and electrostatic precipitator sealing acid-scrubbing cleaning, double conversion and double absorption technology is produced technical grade sulfuric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100342188A CN102001633A (en) | 2009-09-02 | 2009-09-02 | Method for preparing sulfuric acid by using mixture containing magnesium sulfite as raw material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100342188A CN102001633A (en) | 2009-09-02 | 2009-09-02 | Method for preparing sulfuric acid by using mixture containing magnesium sulfite as raw material |
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| CN102001633A true CN102001633A (en) | 2011-04-06 |
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| CN2009100342188A Pending CN102001633A (en) | 2009-09-02 | 2009-09-02 | Method for preparing sulfuric acid by using mixture containing magnesium sulfite as raw material |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848445A (en) * | 2013-12-20 | 2014-06-11 | 中节能六合天融环保科技有限公司 | Technique for preparing magnesium sulfate heptahydrate and concentrated sulfuric acid from liquid sulfur dioxide combined with sulfur dioxide |
| CN110980779A (en) * | 2019-12-17 | 2020-04-10 | 江苏联慧资源环境科技有限公司 | Recovery method of magnesium oxide desulfurizer |
| CN113083015A (en) * | 2021-03-25 | 2021-07-09 | 南京圣创科技有限公司 | Resource utilization method for flue gas desulfurization slag by semidry process |
-
2009
- 2009-09-02 CN CN2009100342188A patent/CN102001633A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103848445A (en) * | 2013-12-20 | 2014-06-11 | 中节能六合天融环保科技有限公司 | Technique for preparing magnesium sulfate heptahydrate and concentrated sulfuric acid from liquid sulfur dioxide combined with sulfur dioxide |
| CN110980779A (en) * | 2019-12-17 | 2020-04-10 | 江苏联慧资源环境科技有限公司 | Recovery method of magnesium oxide desulfurizer |
| CN113083015A (en) * | 2021-03-25 | 2021-07-09 | 南京圣创科技有限公司 | Resource utilization method for flue gas desulfurization slag by semidry process |
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Application publication date: 20110406 |