CN1037087C - Extruding fluorine absorbing process - Google Patents
Extruding fluorine absorbing process Download PDFInfo
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- CN1037087C CN1037087C CN 94116682 CN94116682A CN1037087C CN 1037087 C CN1037087 C CN 1037087C CN 94116682 CN94116682 CN 94116682 CN 94116682 A CN94116682 A CN 94116682A CN 1037087 C CN1037087 C CN 1037087C
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Abstract
The present invention discloses an absorption technology by extruding fluorine, which belongs to a method of absorbing silicon tetrafluoride gas by water. The present invention aims to provide a high efficiency absorption technology and a key device thereof. In the technology of the present invention, an extrusion absorption tower is adopted as an absorbing device, wherein the extrusion absorption tower is composed of a spray head, a mixing chamber, an upper cone, a throat neck part with small diameter, a lower cone and a gas-liquid separation chamber; absorbing liquid is circulated and absorbed by pressurizing with a pump after cooled outside the extrusion absorption tower. The technology of the present invention has the advantages of absorption rate of 99%, little investment, low operation cost and high concentration of produced acids and is suitable for phosphate fertilizer production enterprises with an acid process or for removing fluorine in waste gas generated in phosphoric acid manufacture.
Description
The present invention relates to the compound of fluorine and silicon, specifically, belong to the processing method that water absorbs silicon tetrafluoride gas.
As everyone knows, producing in the process of phosphoric acid or phosphate fertilizer with wet method (or claiming acid system), a part of fluorine in the phosphorus ore is overflowed with the form of gaseous state silicon tetrafluoride usually, and the effusion rate of fluorine can reach 30%-50%, when the phosphate fertilizer Production of Single Superphosphate, bright fertile, the fluorine-containing 15-25g/m of reaching that overflows just of 1 ton of every acquisition
3Waste gas 250-300m
3These waste gas are not spilt into atmosphere if do not collect, handle, and will bring great harm to direct labor and surrounding environment.Therefore, this part silicon tetrafluoride gas is absorbed, both can protect environment, recyclable again fluorine-containing product turns bane into boon.Phosphoric acid by wet process, production of phosphate fertilizer are general, and to remove in the waste gas method of fluorine be under absorption agents such as water, milk of lime, alkali lye absorb silicon tetrafluoride gas in absorption equipment.Chang Yong absorption agent is a water the most, absorbs silicon tetrafluoride and makes silicofluoric acid and silica gel, and its chemical reaction is:
In numerous traditional absorption equipments, should say specific absorption higher be Venturi meter, its assimilated efficiency can reach 90%-92%.But in absorbing the silicon tetrafluoride process, there are a large amount of silica gel to separate out, easily stop up trunnion, increase systemic resistance, unfavorable in producing.So the external at present spray columns that use large volume, domestic then water-sprinkling wheel absorption chambers that adopt are made first step absorption equipment more, though water-sprinkling wheel absorption chamber has solved SiO more
2Blockage problem, but its operation is difficult to grasp, its effect is subjected to factor affecting such as water-sprinkling wheel draft, system's negative pressure again, the separate unit assimilated efficiency only reaches 70%-80% usually; Water-sprinkling wheel self also have axial length and weigh, amount of deflection is big, sealing is difficult for, shortcomings such as very difficult long-term operation.Though the spray absorption tower that minority producer adopts has improved assimilated efficiency, its drag losses is big, is about 3-4 times of water-sprinkling wheel absorption chamber, the power consumption height, and therefore facility investment is difficult to apply also than higher.
The object of the present invention is to provide a kind ofly not only to have had higher absorption efficient, but also can overcome the extruding fluorine absorbing process of the shortcoming of above-mentioned various absorption equipment and flow process, and the key equipment-extruding absorption tower of this technology is provided.
For reaching this purpose, the contriver has compared the relative merits of various absorption equipments in long-term practice, discovery will improve assimilated efficiency, must force the contact of gas-liquid most possibly, thereby develop the processing method that a kind of water absorbs the preparation silicofluoric acid, its feature is that the larynx neck of pressurized water by the extruding absorption tower absorbed silicon tetrafluoride, simultaneously silica gel in the gas and heat are taken out of in the lump, in the circulation liquid bath cooling and isolate silica gel after the recirculation of pumping up absorb.
The used silicofluoric acid absorption equipment of present method is made up of the gas-liquid separation chamber of the long cone of the less larynx neck of cat head shower nozzle, mixing section, inverted upper cone, middle part diameter, bottom and bottom.Circulation fluid after the pressurization enters the waste gas containing fluoride that mixing section enters from the side by the shower nozzle of cat head to be mixed, and the larynx neck by tower further produces extruding then, forces gas-to-liquid contact and absorbs wherein silicon tetrafluoride.Because liquid-gas ratio is very big in the tower, so absorption liquid can fully be taken away the heat that waste gas brings into and make it to cool down.Absorption liquid flows out from the tower lower part outlet after gas-liquid separation chamber is separated from the gas, enters circulation groove, enters circulation groove, to below 60 ℃, is recycled liquid pump again and extracts the absorption that circulates of pressurizeing out after cooling off.The gas of telling then goes from separate chamber's top exit.This absorption equipment contriver is referred to as to push the absorption tower.
Since there is silica gel to separate out inevitably in the waste gas, adopted three measures with reduction silica gel amount in the technology, and be convenient to remove the silica gel in the tower; The one, exhaust gas inlet is guaranteed temperature; The 2nd, the indirect flexible pipe of absorption liquid import and shower nozzle is convenient to dismounting; The 3rd, the cover plate at tower mixing section top is with detachable removable cover.
Because silicofluoric acid is corrosive, so the equipment in this technology, pipeline should adopt corrosion resistant material to make, and wherein, gives birth to main gas temperature height for the wet method phosphine is fertile, and the absorption tower should be adopted through the steel of anti-corrosive treatment and be made; Pipeline is then many to be made with igelite.
Adopt the extruding absorption tower in the technology of the present invention, assimilated efficiency is higher than various absorption equipments both domestic and external at present, and the separate unit specific absorption can reach more than 90%, and secondary absorbs can reach 99%.Because device structure is simple, invest lessly, and to take turns the absorption chamber flow process with the water-sprinkling of scale and compare, its investment can reduce by 1/3.Systemic resistance is little, and power consumption is low, produces acid concentration and can reach more than 20%; System sealing is good, and the operations and maintenance expense is low, compares with the water-sprinkling wheel absorption chamber with scale, and process cost can reduce by 1/2.Technology of the present invention is applicable to the acid system production of phosphate fertilizer enterprise or the phosphoric acid production factory of various scales.
Accompanying drawing 1 is the schematic flow sheet of processing method of the present invention, and 1 is the extruding absorption tower among the figure, and 2 is the absorption liquid recycle pump, and 3 are the circulation liquid bath; 4 is cyclonic separator, and 5 is induced draft fan, 6 tail gas funnels for the band scum dredger.
Embodiment: certain production of phosphate fertilizer factory, adopt concentrated acid pulp process, belt to change into production calcium superphosphate, (concentration reaches 25g/m to its waste gas
3) adopt extruding fluorine absorbing process to handle.Divide two-stage to absorb.Waste gas is separated out to avoid silica gel entering the preceding pipeline do insulation processing of first step absorption tower; Gas is after the absorption as flow process, and specific absorption reaches 99%, fluorine-containingly in the gas is lower than 0.1g/m
3, meet the national standard that waste gas allows discharging.Tail gas is through highly being the smoke stack emission of 10m.Key equipment extruding absorption tower is of a size of: mixing section X400mmXh640mm; Larynx neck diameter is 150mm, lower cone height: 1650mm, total height 2500mm.Tower inner control liquid-gas ratio＞10L/m
3, absorption liquid is with temperature＜60 behind the air naturally cooling ℃.The silicate fluoride solution concentration of producing reaches 23%.The employing secondary absorbs, and second stage absorption liquid reaches behind the finite concentration from circulation groove to the acid of first step string, and first step absorption liquid then can be delivered to silicofluoric acid liquid the silicofluoric acid storage tank after reaching finite concentration.Clear water is added by second stage circulation groove.
Claims (5)
1 one kinds of water absorb the method for preparing silicofluoric acid, it is characterized in that the larynx neck absorption silicon tetrafluoride of pressurized water by the extruding absorption tower, simultaneously silica gel in the gas and heat are taken out of in the lump, in the circulation liquid bath cooling and isolate silica gel after the recirculation of pumping up absorb.
2 the method for claim 1 is characterized in that absorption liquid temperature after cooling off is being used further to the circulation absorption below 60 ℃.
3 one kinds of water absorb the equipment of preparation silicofluoric acid, it is characterized in that it is an extruding absorption tower of being made up of the gas-liquid separation chamber of the long cone of the less larynx neck of cat head shower nozzle, mixing section, inverted upper cone, middle part diameter, bottom and bottom.
4 equipment as claimed in claim 3, it is characterized in that between absorption liquid import and shower nozzle with flexible pipe link, the cat head cover plate is dismountable removable cover.
5 equipment as claimed in claim 3 is characterized in that it is to use through the steel of anti-corrosive treatment to make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94116682 CN1037087C (en) | 1994-10-14 | 1994-10-14 | Extruding fluorine absorbing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94116682 CN1037087C (en) | 1994-10-14 | 1994-10-14 | Extruding fluorine absorbing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1120518A CN1120518A (en) | 1996-04-17 |
| CN1037087C true CN1037087C (en) | 1998-01-21 |
Family
ID=5038042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94116682 Expired - Fee Related CN1037087C (en) | 1994-10-14 | 1994-10-14 | Extruding fluorine absorbing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1037087C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1314628C (en) * | 2004-02-04 | 2007-05-09 | 薛彦辉 | Low temperature decomposition method for potassium feldspar |
| CN101987278B (en) * | 2010-07-28 | 2013-08-07 | 丁正元 | Method for preparing fertilizer grade monoammonium phosphate from sulfurous gases by ammonia-process desulfurization |
| CN101972584A (en) * | 2010-11-01 | 2011-02-16 | 山东聊城鲁西化工第四化肥有限公司 | Device and process for washing phosphoric acid tail gas and cogenerating sodium fluosilicate |
| CN102921256A (en) * | 2012-11-14 | 2013-02-13 | 瓮福（集团）有限责任公司 | Powdery monoammonium phosphate offgas pickling dust removal process changed from sedimentation dust removal process |
| CN106268180B (en) * | 2016-08-31 | 2022-11-22 | 贵州开磷集团股份有限公司 | Device and method for washing and absorbing tail gas generated in wet-process phosphoric acid production |
| BE1028691B1 (en) | 2021-03-13 | 2022-05-04 | Eurochem Antwerpen | ODDA process for the production of nitrogenous fertilizers with reduced sand formation |
-
1994
- 1994-10-14 CN CN 94116682 patent/CN1037087C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1120518A (en) | 1996-04-17 |
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