CN109833768B - Porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization and preparation method thereof - Google Patents
Porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization and preparation method thereof Download PDFInfo
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 74
- 230000023556 desulfurization Effects 0.000 title claims abstract description 74
- 239000003546 flue gas Substances 0.000 title claims abstract description 51
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 50
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002245 particle Substances 0.000 claims abstract description 25
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims abstract description 17
- 239000000347 magnesium hydroxide Substances 0.000 claims abstract description 17
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 15
- 239000010451 perlite Substances 0.000 claims description 11
- 235000019362 perlite Nutrition 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 10
- 235000019353 potassium silicate Nutrition 0.000 claims description 9
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 9
- 239000004568 cement Substances 0.000 claims description 6
- 239000010455 vermiculite Substances 0.000 claims description 6
- 235000019354 vermiculite Nutrition 0.000 claims description 6
- 229910052902 vermiculite Inorganic materials 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 13
- 159000000003 magnesium salts Chemical class 0.000 abstract description 7
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 abstract description 6
- 229910001425 magnesium ion Inorganic materials 0.000 abstract description 6
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical compound [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- 239000011148 porous material Substances 0.000 abstract description 4
- 238000005507 spraying Methods 0.000 abstract description 3
- 230000003009 desulfurizing effect Effects 0.000 description 14
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulfur dioxide Inorganic materials O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 11
- 239000000945 filler Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 239000007921 spray Substances 0.000 description 10
- 239000007788 liquid Substances 0.000 description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 239000007767 bonding agent Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000010440 gypsum Substances 0.000 description 5
- 229910052602 gypsum Inorganic materials 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000000292 calcium oxide Substances 0.000 description 4
- 235000012255 calcium oxide Nutrition 0.000 description 4
- 238000005868 electrolysis reaction Methods 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 235000011116 calcium hydroxide Nutrition 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 235000019738 Limestone Nutrition 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000004088 foaming agent Substances 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical class [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 238000006115 defluorination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention belongs to the technical field of electrolytic aluminum flue gas desulfurization in the electrolytic aluminum industry, and particularly relates to a porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization and a preparation method thereof. The porous water-fixing desulphurization block is prepared from the following raw materials in percentage by mass: 40-70% of magnesium hydroxide, 5-25% of water-fixing particles, 5-20% of hydrochloric acid, 5-15% of a binding agent and 10-30% of water. The desulfurization block has interconnected pores for prolonging SO2The retention time in the desulfurization block is suitable for the large amount of SO flue gas in the electrolytic aluminum2The concentration is low; the water-fixing particles have good water-absorbing and water-fixing effects, a large amount of water films are formed on the surface of the desulfurization block under the condition of spraying circulating water, SO that the generated magnesium salt can be dissolved in water quickly and is taken out of the desulfurization tower, and the magnesium ions are replaced and then enter the desulfurization chamber and SO2The reaction is continued, SO that the SO in the electrolytic aluminum flue gas can be efficiently removed2And ultra-low emission is realized.
Description
Technical Field
The invention belongs to the technical field of electrolytic aluminum flue gas desulfurization in the electrolytic aluminum industry, and particularly relates to a porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization and a preparation method thereof.
Background
The existing prebaked anode aluminum electrolytic cell can generate CO in the electrolytic process2、CO、SO2And HF and other harmful gases (anode gases for short), wherein the anode gases escape through a fire hole opening of a middle seam of the electrolytic cell, enter the upper part of the electrolytic cell, are pumped into a flue gas pipeline by a gas collection system, and simultaneously a large amount of outside air is pumped into a smoke exhaust system of the electrolytic cell together to form electrolytic flue gas. The gas flow of the electrolysis flue gas is large, the flue gas temperature is low (about 120 ℃), and SO is2The content is reduced by about 300mg/m3Left and right. The electrolytic aluminum industry implements dry defluorination at present and aims at SO in flue gas2Effective treatment measures are not taken yet, so that the energy conservation and emission reduction work of the whole electrolytic aluminum industry is repeated and far.
In the limestone-gypsum wet desulphurization technology in the existing wet desulphurization technology, because the activity of limestone is low, the sufficient desulphurization efficiency is ensured by increasing the spray amount of absorption liquid and improving the liquid-gas ratio, so the operation cost is high, and the limestone is replaced by lime powder with high activity, so the problems of easy scaling in a tower, blockage of a gas-liquid contactor and the like exist although the desulphurization efficiency can be improved; although the ammonia desulfurization technology has high desulfurization efficiency, ammonia is easy to volatilize, so that the utilization rate of a desulfurizer is not high, the influence on the working environment is generated, in addition, a huge water circulation system is needed, and the operation cost is high. The wet desulphurization technology is successfully applied to power plants, but the characteristics of the electrolysis flue gas and the power plantsDifferent from the prior art, and some areas lack water and the operation cost is possibly extremely high, SO that the SO in the electrolytic aluminum flue gas cannot be effectively purified at present2The method of (1).
The emission standard of pollutants in the aluminum industry (GB25465-2010) states that the flue gas SO is generated in the industrial production process of electrolytic aluminum2Emission concentration limit of 200mg/m3Adjusted to 100mg/m3. According to the requirements of 'Jingjin Ji and 2018 and 2019 air pollution comprehensive treatment attack and hardness action scheme', the special emission limit value of the air pollutants is strictly executed by the colored industry, and corresponding action schemes are also formulated in provinces and cities. If a certain province requires to greatly promote the ultra-low emission reconstruction test point, SO2The discharge concentration is not higher than 50mg/m3. In view of the increasingly strict environmental protection policy, the desulfurization technology with less resource consumption and low operation cost needs to be developed aiming at the actual situation of the electrolytic aluminum industry, and has great significance for solving the problem of flue gas pollution of electrolytic aluminum.
The invention patent with publication number CN 106422746A discloses a filler for flue gas desulfurization and denitration and a preparation method thereof, the filler is composed of magnesium oxide, magnesium chloride, phosphoric acid, glass fiber, an adhesive and a foaming agent, after the filler is treated by the foaming agent, the interior of the filler is of a porous structure, the surface ratio of the filler is increased, but the pores in the filler are not communicated with each other, which is equivalent to that the volume of the filler is expanded by filling bubbles in the filler so as to increase the surface ratio, so that the filler can not increase the retention time of the flue gas in the filler, and can only be suitable for the flue gas with high sulfur content (1000-3000 mg/m)3) The desulfurization and denitration treatment of the sulfur-containing gas has large gas flow, low flue gas temperature and SO2Low levels of electrolysis flue gas treatment are not suitable.
Disclosure of Invention
The invention aims to provide a method for preparing aluminum electrolysis catalyst, which is suitable for large flue gas volume, low flue gas temperature and SO of electrolytic aluminum2A porous water-fixing desulfurization block for the flue gas desulfurization of electrolytic aluminum with low concentration and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a porous water-fixing desulfurization block for flue gas desulfurization of electrolytic aluminum, which is prepared from the following raw materials in percentage by mass: 40-70% of magnesium hydroxide, 5-25% of water-fixing particles, 5-20% of hydrochloric acid, 5-15% of a binding agent and 10-30% of water.
Preferably, the water-fixing particles are one or more of slag, perlite or vermiculite.
Preferably, the particle size of the water-fixing particles is 1-6 mm.
Preferably, the bonding agent is one or two of cement and solid water glass.
The invention also provides a preparation method of the porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization, which comprises the following steps:
a: weighing the raw materials according to the mass percentage, putting magnesium hydroxide, a bonding agent and water into a stirrer, and stirring for 1-10 min at a speed of 30-100 r/min; then adding hydrochloric acid, and stirring for 1-10 min at a speed of 30-100 r/min; adding water-fixing particles, and stirring for 1-5 min at a speed of 30-100 r/min to obtain a mixed material;
b: and C, adding the mixed material in the step A into a mold, compacting to prepare a porous water-fixing desulphurization block, and drying for later use.
Preferably, the water-fixing particles are one or more of slag, perlite or vermiculite.
Preferably, the particle size of the water-fixing particles is 1-6 mm.
Preferably, the bonding agent is one or two of cement and solid water glass.
Compared with the prior art, the invention has the beneficial effects that:
the desulfurization block adopts the solid water particles as the internal framework of the desulfurization block, and the magnesium hydroxide is bonded on the surfaces of the solid water particles by using a bonding agent and then made into a blocky structure. The desulfurization block has interconnected pores for prolonging SO2The retention time in the desulfurization block ensures that the desulfurization block can be suitable for the electrolytic aluminum with large smoke quantity, low smoke temperature and SO2The low concentration, fully reacting with magnesium hydroxide to generate magnesium salt which is easy to dissolve in water; the water-fixing particles have good water absorption and water fixation effects, a large amount of water films are formed on the surface of the desulfurization block under the condition of spraying circulating water,SO that the generated magnesium salt can be dissolved in water quickly and taken out of the desulfurizing tower, after the magnesium salt reacts with quick lime or hydrated lime through the reaction tank, magnesium ions are replaced out and enter circulating water, the circulating water and gypsum are subjected to solid-liquid separation in a settling tank to regenerate the circulating water, and the magnesium ions in the circulating water enter a desulfurizing chamber and are carried out with SO2The reaction is continued, SO that the SO in the electrolytic aluminum flue gas can be efficiently removed2And ultra-low emission is realized. Compared with limestone-gypsum wet desulphurization process, the desulphurization method of the desulphurization block has the advantages of low investment and operation cost and greatly reduced circulating water consumption.
Drawings
FIG. 1 is a schematic diagram of an electrolytic aluminum flue gas desulfurization apparatus according to an embodiment of the present invention.
The reference numbers in the drawings: 1 is an air inlet flue, 2 is a fan, 3 is a desulfurizing tower, 4 is a reaction tank, 5 is a settling tank, 6 is an overflow tank, and 8 is an exhaust flue.
Detailed Description
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art. The test methods in the following examples are conventional methods unless otherwise specified.
Example one
A porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization is prepared from the following raw materials by mass: 50kg of magnesium hydroxide, 12kg of perlite, 10kg of hydrochloric acid, 8kg of solid water glass and 20kg of water. The particle size of the perlite is 1 mm.
The preparation method of the porous water-fixing desulfurization block for the electrolytic aluminum flue gas desulfurization comprises the following steps:
a: weighing the raw materials according to the mass, putting magnesium hydroxide, solid water glass and water into a stirrer, and stirring for 10min at a speed of 100 r/min; then adding hydrochloric acid, and stirring for 10min at a speed of 100 r/min; then adding perlite, and stirring for 5min at the speed of 100r/min to obtain a mixed material;
b: and C, adding the mixed material in the step A into a mold, compacting to prepare a porous water-fixing desulphurization block, and drying for later use.
Example two
A porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization is prepared from the following raw materials by mass: 40kg of magnesium hydroxide, 5kg of slag, 20kg of hydrochloric acid, 5kg of cement, 10kg of solid water glass and 20kg of water. The particle size of the slag was 6 mm.
The preparation method of the porous water-fixing desulfurization block for the electrolytic aluminum flue gas desulfurization comprises the following steps:
a: weighing the raw materials according to the mass, putting magnesium hydroxide, solid water glass and water into a stirrer, and stirring for 3min at a speed of 30 r/min; then adding hydrochloric acid, and stirring for 5min at the speed of 60 r/min; then adding perlite, and stirring for 3min at the speed of 80r/min to obtain a mixed material;
b: and C, adding the mixed material in the step A into a mold, compacting to prepare a porous water-fixing desulphurization block, and drying for later use.
EXAMPLE III
A porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization is prepared from the following raw materials by mass: 70kg of magnesium hydroxide, 10kg of vermiculite, 5kg of hydrochloric acid, 5kg of cement and 10kg of water. The particle size of the perlite is 1 mm.
The preparation method of the porous water-fixing desulfurization block for the electrolytic aluminum flue gas desulfurization comprises the following steps:
a: weighing the raw materials according to the mass, putting magnesium hydroxide, solid water glass and water into a stirrer, and stirring for 1min at the speed of 60 r/min; then adding hydrochloric acid, and stirring for 1min at a speed of 30 r/min; then adding perlite, and stirring for 1min at 30r/min to obtain a mixed material;
b: and C, adding the mixed material in the step A into a mold, compacting to prepare a porous water-fixing desulphurization block, and drying for later use.
Example four
A porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization is prepared from the following raw materials by mass: 40kg of magnesium hydroxide, 10kg of vermiculite, 5kg of hydrochloric acid, 15kg of solid water glass and 30kg of water. The particle size of the vermiculite is 3 mm.
EXAMPLE five
A porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization is prepared from the following raw materials by mass: 40kg of magnesium hydroxide, 25kg of perlite, 5kg of hydrochloric acid, 5kg of cement and 25kg of water. The particle size of the perlite is 4 mm.
Application examples
Test site: 400kA series electrolytic cell for certain electrolytic aluminum plant in Henan
As shown in figure 1, the electrolytic aluminum flue gas desulfurization device comprises a flue gas inlet pipeline 1, a fan 2, a desulfurization tower 3, a flue gas outlet pipeline 8, a spray water circulation device, a reaction tank 4, a settling tank 5 and an overflow tank 6;
the desulfurizing tower 3 comprises a plurality of layers of desulfurizing chambers arranged at the lower part and a gas-collecting hood arranged at the upper part, two adjacent layers of desulfurizing chambers are separated by a partition plate, porous water-fixing desulfurizing blocks are stacked on the partition plate, vent holes are uniformly formed in the partition plate, and the aperture of each vent hole is smaller than the size of each porous water-fixing desulfurizing block;
the spray water circulating device is arranged at the upper part of each layer of the desulfurization chamber and comprises a plurality of spray pipes which are distributed in a radial shape and spray heads which are uniformly arranged along each spray pipe;
the smoke inlet pipeline 1 is connected with an air inlet of a lowermost desulfurization chamber of the desulfurization tower 3 through a fan 2, an outlet of the gas collecting hood is connected with the smoke outlet pipeline, a liquid outlet at the bottom of the desulfurization tower 3 is connected with an inlet of the reaction tank 4 through a pump, an outlet of the reaction tank 4 is connected with an inlet of the settling tank 5 through a pump, an outlet of the settling tank 5 is higher than an inlet of the overflow groove 6, an outlet of the settling tank 5 is connected with an inlet of the overflow groove 6 through a pipeline, and an outlet of the overflow groove 6 is connected with each spray pipe through a pump.
The test conditions are as follows: the porous water-fixing desulfurization block prepared in the example 1 is adopted to treat electrolytic aluminum flue gas discharged by 70 400kA series electrolytic tanks, and the flue gas amount is 50 ten thousand Nm3/h、SO2The content of the additive is 260-300 mg/m3(ii) a The desulfurization tower is 12.6m long, 12.4m wide and 19.75m high, and consists of 3 layers of desulfurization chambers, wherein 70 tons of porous water-fixing desulfurization blocks are placed in each layer of desulfurization chamber, the size of the desulfurization blocks is 100mm multiplied by 100mm, and the stacking height is about 1.5 m; the circulating water flow of the spray water circulating device is 80m3H is used as the reference value. Quicklime is filled in the reaction tank.
The electrolytic flue gas in the flue gas inlet pipeline 1 is blown into a desulfurizing tower 3 through a fan 2, the desulfurizing tower 3 comprises a plurality of layers of desulfurizing chambers at the lower part and a gas collecting hood at the upper part, and porous solid water desulfurization is uniformly stacked in each layer of desulfurizing chamberThe upper part of each layer of the desulfurization chamber is connected with a spray water circulating device, and the porous solid water desulfurization blocks and SO in the flue gas are subjected to the action of circulating water2Magnesium salt is generated by contact reaction, and residual flue gas is collected in a gas-collecting hood at the upper part of the desulfurizing tower 3 and then discharged through a flue gas outlet pipeline 8;
collecting the circulating liquid containing magnesium salt at the bottom of the desulfurizing tower 3, pumping into a reaction tank 4, and reacting with quick lime or hydrated lime in the reaction tank 4 to obtain a solid-liquid mixture; the solid-liquid mixture enters a settling tank 5 through a pump, liquid on the upper part of the settling tank 5 after settling overflows into an overflow tank 6 as regenerated circulating water, the regenerated circulating water is pumped into a spray water circulating device through the pump for recycling, and solid on the lower part of the settling tank 5 is periodically extracted. The results are shown in Table 1.
TABLE 1 Sulfur dioxide content in electrolytic flue gas before and after desulfurization
The desulfurization block adopts the solid water particles as the internal framework of the desulfurization block, and the magnesium hydroxide is bonded on the surfaces of the solid water particles by using a bonding agent and then made into a blocky structure. The desulfurization block has interconnected pores for prolonging SO2The retention time in the desulfurization block is suitable for the large amount of SO flue gas in the electrolytic aluminum2The low concentration, fully reacting with magnesium hydroxide to generate magnesium salt which is easy to dissolve in water; under the condition of spraying circulating water, a large amount of water films are formed on the surface of a desulfurization block, SO that generated magnesium salts can be dissolved in water quickly and are carried out of a desulfurization tower, magnesium ions are replaced to enter the circulating water after the magnesium ions react with quicklime or hydrated lime in a reaction tank, the circulating water and gypsum are subjected to solid-liquid separation in a settling tank to regenerate the circulating water, and the magnesium ions in the circulating water enter a desulfurization chamber and are subjected to SO2The reaction is continued, SO that the SO in the electrolytic aluminum flue gas can be efficiently removed2And ultra-low emission is realized. Compared with limestone-gypsum wet desulphurization process, the desulphurization method of the desulphurization block has the advantages of low investment and operation cost and greatly reduced circulating water consumption.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are merely illustrative and not restrictive, and it should be understood that other embodiments may be easily made by those skilled in the art by replacing or changing the technical contents disclosed in the specification, and therefore, all changes and modifications that are made on the principle of the present invention should be included in the scope of the claims of the present invention.
Claims (1)
1. A preparation method of a porous water-fixing desulfurization block for electrolytic aluminum flue gas desulfurization is characterized by comprising the following steps:
a: weighing raw materials according to the mass percentage of 40-70% of magnesium hydroxide, 5-25% of water-fixing particles, 5-20% of hydrochloric acid, 5-15% of binding agent and 10-30% of water, putting the magnesium hydroxide, the binding agent and the water into a stirrer, and stirring for 1-10 min at the speed of 30-100 r/min; then adding hydrochloric acid, and stirring for 1-10 min at a speed of 30-100 r/min; adding water-fixing particles, stirring for 1-5 min at a speed of 30-100 r/min to obtain a mixed material;
b: b, adding the mixed material obtained in the step A into a mold, compacting to prepare a porous water-fixing desulphurization block, and drying for later use;
the water-fixing particles are one or more of slag, perlite or vermiculite;
the particle size of the water-fixing particles is 1-6 mm;
the binding agent is one or two of cement and solid water glass.
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| CN101569828A (en) * | 2009-06-10 | 2009-11-04 | 河北工业大学 | Solid particle used for jetting bed flue gas desulfurization process and preparation method |
| CN105498517A (en) * | 2015-11-30 | 2016-04-20 | 攀钢集团攀枝花钢钒有限公司 | Application of furnace slag as desulfurization absorber and desulfurization method |
| CN105727730A (en) * | 2016-03-22 | 2016-07-06 | 天津滨环化学工程技术研究院有限公司 | Efficient flue gas desulfurization and denitrification method and materials adopted by same |
| CN106422746A (en) * | 2016-10-13 | 2017-02-22 | 辽宁北环净化技术有限公司 | Filler for smoke desulfurization and denitrification and preparation method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101569828A (en) * | 2009-06-10 | 2009-11-04 | 河北工业大学 | Solid particle used for jetting bed flue gas desulfurization process and preparation method |
| CN105498517A (en) * | 2015-11-30 | 2016-04-20 | 攀钢集团攀枝花钢钒有限公司 | Application of furnace slag as desulfurization absorber and desulfurization method |
| CN105727730A (en) * | 2016-03-22 | 2016-07-06 | 天津滨环化学工程技术研究院有限公司 | Efficient flue gas desulfurization and denitrification method and materials adopted by same |
| CN106422746A (en) * | 2016-10-13 | 2017-02-22 | 辽宁北环净化技术有限公司 | Filler for smoke desulfurization and denitrification and preparation method thereof |
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