CN117735863A - Lime slaking method for preparing slaked lime with high specific surface area - Google Patents
Lime slaking method for preparing slaked lime with high specific surface area Download PDFInfo
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 title claims abstract description 69
- 239000000920 calcium hydroxide Substances 0.000 title claims abstract description 67
- 235000011116 calcium hydroxide Nutrition 0.000 title claims abstract description 67
- 229910001861 calcium hydroxide Inorganic materials 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 43
- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 24
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 24
- 239000004571 lime Substances 0.000 title claims abstract description 24
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 122
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 97
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000000292 calcium oxide Substances 0.000 claims abstract description 64
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 64
- 239000003595 mist Substances 0.000 claims abstract description 61
- 230000008569 process Effects 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims description 64
- 238000005243 fluidization Methods 0.000 claims description 48
- 239000007787 solid Substances 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 19
- 239000007864 aqueous solution Substances 0.000 claims description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 15
- 238000000926 separation method Methods 0.000 claims description 15
- 238000001035 drying Methods 0.000 claims description 11
- 238000009826 distribution Methods 0.000 claims description 7
- 238000004064 recycling Methods 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 239000000376 reactant Substances 0.000 claims description 4
- 230000001186 cumulative effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 19
- 238000002360 preparation method Methods 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 3
- 238000012827 research and development Methods 0.000 abstract description 3
- 241000537371 Fraxinus caroliniana Species 0.000 abstract description 2
- 235000010891 Ptelea trifoliata Nutrition 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 230000001808 coupling effect Effects 0.000 abstract description 2
- 230000007547 defect Effects 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 238000013508 migration Methods 0.000 abstract description 2
- 238000002156 mixing Methods 0.000 description 25
- 239000002245 particle Substances 0.000 description 19
- 230000009471 action Effects 0.000 description 8
- 230000029087 digestion Effects 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- FFBHFFJDDLITSX-UHFFFAOYSA-N benzyl N-[2-hydroxy-4-(3-oxomorpholin-4-yl)phenyl]carbamate Chemical compound OC1=C(NC(=O)OCC2=CC=CC=C2)C=CC(=C1)N1CCOCC1=O FFBHFFJDDLITSX-UHFFFAOYSA-N 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000011282 treatment Methods 0.000 description 2
- 238000004438 BET method Methods 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 235000013373 food additive Nutrition 0.000 description 1
- 239000002778 food additive Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000051 modifying effect Effects 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a lime slaking method for preparing slaked lime with high specific surface area. The invention creatively introduces hydrogen peroxide and high-pressure fine water mist into the traditional lime slaking system to solve the technical defects in the existing lime slaking process, innovates from the mechanism aspect, effectively controls the exothermic problem of the quicklime slaking process through the special heat absorption, expansion and migration characteristics of the high-pressure fine water mist under the exothermic reaction condition and the coupling action of the hydrogen peroxide, promotes the water-ash contact interface, strengthens the slaking reaction, thereby realizing the preparation of slaked lime with high specific surface, and can also provide technical reference for the research and development of novel slaking equipment, and the specific surface of the slaked lime prepared by the invention is 51.62m at most 2 And/g, which is far higher than the similar products sold in the market.
Description
Technical Field
The invention belongs to the field of research and development of high-added-value calcium-based materials, and particularly relates to a lime digestion method for preparing slaked lime with a high specific surface area.
Background
The traditional lime slaking process is a process of reacting quicklime with water to produce slaked lime, which is also known as "slaking" or "slaking" of lime. The quicklime is put into water, and the quicklime emits heat in the reaction process, so that the reaction temperature needs to be controlled to avoid overheating. The slaked lime water generally needs to be subjected to filtration and purification treatments to remove impurities. The purified lime water can be dried by centrifugal dehydration and other methods to finally obtain dry lime powder. A great amount of heat is generated in the lime slaking process, so that the reaction temperature needs to be controlled to avoid overheating
Compared with the traditional slaked lime, the slaked lime with high specific surface area has larger specific surface area, stronger adsorption performance and better reactivity, thus playing better role in practical application, having important application value and mainly comprising engine oil filtration, flue gas desulfurization, sewage treatment, food additives and the like.
However, it is currently difficult to prepare slaked lime with a high specific surface area by the conventional lime slaking process. The slaked lime prepared by the traditional method has larger particles, lower porosity among particles, and obviously limited adsorption capacity and reactivity.
Therefore, in order to prepare slaked lime with a high specific surface area, some new preparation techniques are required. The method can not only overcome the technical breaking of industry, but also provide a borrowable method for preparing the material with high specific surface.
Disclosure of Invention
The invention aims to: the invention aims to provide a lime slaking method for preparing slaked lime with high specific surface area, which is simple in steps.
The technical scheme is as follows: the invention provides a lime slaking method for preparing slaked lime with high specific surface, which comprises the following steps:
(1) The hydrogen peroxide aqueous solution is led into a high-pressure fine water mist generator to manufacture high-pressure fine water mist, the high-pressure fine water mist is sprayed into a fluidization chamber to react with fluidized quicklime powder in the fluidization chamber, and then reactants are led out.
(2) Carrying out gas-solid separation on the derived reactant, recycling the obtained gas, and leading the gas back to the fluidization chamber for continuously fluidizing the quicklime, wherein the solid is separation powder;
(3) And further drying the separated powder to obtain dried powder, namely the slaked lime with high specific surface area.
Wherein the concentration of the hydrogen peroxide aqueous solution in the step (1) is 0.02% -0.2%.
Wherein the action pressure of the high-pressure water mist generator in the step (1) is 10-20 MPa, and the accumulated volume distribution of the mist drops of the high-pressure water mist generator is set as D V0.99 <20～100μm。
Wherein the liquid-solid ratio of the hydrogen peroxide aqueous solution to the fluidized quicklime powder in the step (1) is 1-1.2:1 mL/g.
Wherein the reaction time of the high-pressure fine water mist and the fluidized quicklime powder in the step (1) is 5-45 minutes.
Wherein the solid-liquid separation in the step (2) is performed using a spiral separator.
Wherein the gas used for fluidizing the quicklime in the fluidizing chamber in the step (2) is nitrogen, and the temperature of the fluidizing chamber is 40-120 ℃.
Wherein the temperature of the further drying in the step (3) is 50-250 ℃, and the water content of the slaked lime with the high specific surface area is 0.5-1.5%.
Wherein the high specific surface area slaked lime obtained in the step (3) has a specific surface area of 42-52 m 2 /g。
The invention also provides the slaked lime with high specific surface area prepared by the digestion method.
Reaction mechanism: the fine water mist can suspend in the air for a long time, and can quickly absorb heat in the collision contact process with the fluidized quicklime powder to realize quick expansion of the volume of the fine water mist, so that the fine water mist is not only beneficial to full contact of water molecules with quicklime particles through three-dimensional movement, but also can quickly release heat generated in the reaction process of calcium oxide and water vapor in an isolation area formed by water vapor expansion, thereby reducing the surface temperature of fluid particles to promote continuous reaction of calcium oxide and water, and meanwhile, the water vapor expansion pressure can promote hydrogen peroxide to be immersed into the quicklime and the quicklime particles to be decomposed into water vapor and oxygen. The hydrogen peroxide decomposition process can induce the collapse of the particle structure and the surface modification, wherein the generated water vapor further induces the quicklime digestion reaction, and the quicklime particles realize the promotion of the specific surface under the extrusion and shearing actions of oxygen molecules and water vapor.
Compared with the prior art, the invention has the following remarkable advantages: the invention creatively introduces hydrogen peroxide and high-pressure fine water mist into the traditional lime slaking system to solve the technical defects in the existing lime slaking process, innovates from the mechanism aspect, effectively controls the exothermic problem of the quicklime slaking process through the special heat absorption, expansion and migration characteristics of the high-pressure fine water mist under the exothermic reaction condition and the coupling action of the hydrogen peroxide, promotes the water-ash contact interface, strengthens the slaking reaction, thereby realizing the preparation of slaked lime with high specific surface, and can also provide technical reference for the research and development of novel slaking equipment, and the specific surface of the slaked lime prepared by the invention is 51.62m at most 2 And/g, which is far higher than the similar products sold in the market.
Drawings
FIG. 1 is a flow chart of the preparation method of the present invention.
Detailed Description
The technical scheme of the invention is further described below with reference to the accompanying drawings.
EXAMPLE 1 influence of Hydrogen peroxide aqueous solution concentration on specific surface of high specific surface area slaked lime prepared
Mixing water and hydrogen peroxide to prepare hydrogen peroxide aqueous solution with concentration of 0.0125%, 0.015%, 0.0175%, 0.02%, 0.11%, 0.2%, 0.22%, 0.24% and 0.26%. Introducing hydrogen peroxide water solution into a high-pressure fine water mist generator to prepare fine water mist, wherein the action pressure of the high-pressure fine water mist generator is 10MPa, and the accumulated volume distribution D of mist drops V0.99 <100 μm. Spraying high-pressure fine water mist into the fluidization chamber to react with fluidized quicklime powder in the fluidization chamber, mixing for 5 min, guiding out from the port of the fluidization chamber, and passing through the screwThe cyclone separator performs gas-solid separation, the obtained gas is recycled, the solid is separation powder, the liquid-solid ratio of the hydrogen peroxide aqueous solution to the fluidized quicklime powder is 1:1mL/g, the fluidizing gas is nitrogen, and the temperature of the fluidizing chamber is 40 ℃. The separated powder is further dried to make the water content in the powder be 1.5%, and the obtained dried powder is the slaked lime with high specific surface area, wherein the drying temperature is 50 ℃.
And (3) detecting the specific surface area of the lime hydrate: the specific surface area of the solid substance (GB/T19587-2017) was measured and determined according to the gas adsorption BET method.
The test results of the inventive examples are shown in Table 1.
TABLE 1 influence of Hydrogen peroxide aqueous solution concentration on specific surface of high specific surface area slaked lime prepared
| Concentration of aqueous Hydrogen peroxide solution | Specific surface (m) 2 /g) | Percentage of relative error |
| 0.0125％ | 28.19 | ±0.1％ |
| 0.015％ | 33.46 | ±0.2％ |
| 0.0175％ | 37.75 | ±0.1％ |
| 0.02％ | 42.27 | ±0.1％ |
| 0.11％ | 44.04 | ±0.1％ |
| 0.2％ | 45.63 | ±0.1％ |
| 0.22％ | 41.95 | ±0.1％ |
| 0.24％ | 39.68 | ±0.1％ |
| 0.26％ | 38.57 | ±0.1％ |
As can be seen from table 1, when the concentration of the aqueous hydrogen peroxide solution is less than 0.02% (as in table 1, the aqueous hydrogen peroxide solution concentration=0.0175%, 0.015%, 0.0125% and lower values not listed in table 1), the concentration of the aqueous hydrogen peroxide solution is low, the hydrogen peroxide immersed in quicklime and slaked lime particles is reduced, the collapse of the particle structure and the surface modifying effect are deteriorated, resulting in that the specific surface of the prepared high specific surface slaked lime is significantly reduced with the decrease of the concentration of the aqueous hydrogen peroxide solution. When the concentration of the aqueous hydrogen peroxide solution is equal to 0.02% -0.2% (as in table 1, the concentration of the aqueous hydrogen peroxide solution=0.02%, 0.11% and 0.2%), the water vapor expansion pressure can promote the hydrogen peroxide to be immersed into quicklime and slaked lime particles to be decomposed into water vapor and oxygen. The hydrogen peroxide decomposition process can induce the collapse of the particle structureSurface modification, wherein the generated water vapor further induces quicklime digestion reaction. Finally, the prepared slaked lime with high specific surface area has specific surface area of more than 42m 2 And/g. When the concentration of the aqueous hydrogen peroxide solution is greater than 0.2% (as in table 1, the concentration of the aqueous hydrogen peroxide solution=0.22%, 0.24%, 0.26% and higher values not listed in table 1), the concentration of the aqueous hydrogen peroxide solution is too high, and the decomposition of the hydrogen peroxide is too fast, so that the specific surface of the prepared high-specific-surface slaked lime is remarkably reduced along with the further increase of the concentration of the aqueous hydrogen peroxide solution. In general, the benefits and the cost are combined, and when the concentration of the aqueous solution of the hydrogen peroxide is equal to 0.02% -0.2%, the method is most beneficial to improving the specific surface of the prepared slaked lime.
EXAMPLE 2 influence of mixing time of fine Water mist and fluidized quicklime powder on specific surface of slaked lime with high specific surface area prepared
Mixing water and hydrogen peroxide to prepare 0.2% concentration hydrogen peroxide solution. Mixing water and hydrogen peroxide to prepare hydrogen peroxide aqueous solution with concentration of 0.0125%, 0.015%, 0.0175%, 0.02%, 0.11%, 0.2%, 0.22%, 0.24% and 0.26%. Introducing hydrogen peroxide water solution into a high-pressure fine water mist generator to prepare fine water mist, wherein the action pressure of the high-pressure fine water mist generator is 15MPa, and the accumulated volume distribution D of mist drops V0.99 <60 μm. Spraying high-pressure fine water mist into a fluidization chamber to react with fluidized quicklime powder in the fluidization chamber, mixing for 0.35 min, 0.4 min, 0.45 min, 5 min, 25 min, 45 min, 47.5 min, 50 min and 52.5 min, leading out from a port of the fluidization chamber, and performing gas-solid separation by a spiral separator to obtain gas for recycling, wherein the solid is separation powder, the liquid-solid ratio of hydrogen peroxide aqueous solution to the fluidized quicklime powder is 1.1:1mL/g, the fluidization gas is nitrogen, and the temperature of the fluidization chamber is 80 ℃. The separated powder is further dried to make the water content in the powder be 1%, and the obtained dried powder is the slaked lime with high specific surface area, wherein the drying temperature is 150 ℃.
The slaked lime specific surface area was measured as in example 1 and the test results of the inventive examples are shown in Table 2.
TABLE 2 influence of mixing time of fine mist and fluidized quicklime powder on specific surface of slaked lime with high specific surface area
As can be seen from table 2, when the mixing time of the fine water mist with the fluidized quicklime powder is less than 5 minutes (as in table 2, the mixing time of the fine water mist with the fluidized quicklime powder=0.45 minutes, 0.4 minutes, 0.35 minutes, and lower values not listed in table 2), the mixing time of the fine water mist with the fluidized quicklime powder is too short, the reaction is insufficient, resulting in that the prepared high specific surface slaked lime surface is significantly reduced as the mixing time of the fine water mist with the fluidized quicklime powder is reduced. When the mixing time of the fine water mist and the fluidized quicklime powder is equal to 5-45 minutes (as in table 2, when the mixing time of the fine water mist and the fluidized quicklime powder=5 minutes, 25 minutes and 45 minutes), the fine water mist can be suspended in the air for a long time, and can quickly absorb heat in the collision contact process with the fluidized quicklime powder, so that the self-volume quick expansion is realized, the full contact of water molecules and quicklime particles through three-dimensional movement is facilitated, meanwhile, the heat generated in the reaction process of calcium oxide and water vapor can be quickly released by the isolation area formed by water vapor expansion, the surface temperature of fluid particles is reduced, the continuous reaction of calcium oxide and water is promoted, and meanwhile, the water vapor expansion pressure can promote the hydrogen peroxide to be immersed into the quicklime and the quicklime particles to be decomposed into water vapor and oxygen. The hydrogen peroxide decomposition process can induce the collapse of the particle structure and the surface modification, wherein the generated water vapor further induces the quicklime digestion reaction, and the quicklime particles realize the promotion of the specific surface under the extrusion and shearing actions of oxygen molecules and water vapor. Finally, the prepared slaked lime with high specific surface area has specific surface area of more than 45m 2 And/g. When the mixing time of the fine water mist and the fluidized quicklime powder is more than 45 minutes (as in table 2, the mixing time of the fine water mist and the fluidized quicklime powder=47.5 minutes, 50 minutes, 52.5 minutes and higher values not listed in table 2), the mixing time of the fine water mist and the fluidized quicklime powder is too long, the digestion is excessive, and the materials are agglomerated, so that the specific surface of the prepared high-specific-surface slaked lime is remarkably reduced as the mixing time of the fine water mist and the fluidized quicklime powder is further increased. In general, the combination of benefits and costs,when the mixing time of the fine water mist and the fluidized quicklime powder is 5-45 minutes, the method is most favorable for improving the specific surface of the prepared slaked lime.
EXAMPLE 3 influence of the fluidization chamber temperature on the specific surface area of the high specific surface area slaked lime produced
Mixing water and hydrogen peroxide to prepare 0.2% concentration hydrogen peroxide solution. Introducing hydrogen peroxide water solution into a high-pressure fine water mist generator to prepare fine water mist, wherein the action pressure of the high-pressure fine water mist generator is 20MPa, and the accumulated volume distribution D of mist drops V0.99 <20 μm. Spraying high-pressure fine water mist into a fluidization chamber to react with fluidized quicklime powder in the fluidization chamber, mixing for 45 minutes, guiding out from a port of the fluidization chamber, and performing gas-solid separation by a spiral separator to obtain gas for recycling, wherein the solid is separated powder, the liquid-solid ratio of hydrogen peroxide aqueous solution to the fluidized quicklime powder is 1.2:1mL/g, the fluidization gas is nitrogen, and the temperature of the fluidization chamber is 32.5 ℃, 35 ℃, 37.5 ℃, 40 ℃, 80 ℃, 120 ℃, 130 ℃, 140 ℃ and 150 ℃. The separated powder is further dried to make the water content in the powder be 0.5%, and the obtained dried powder is the slaked lime with high specific surface area, wherein the drying temperature is 250 ℃.
The slaked lime specific surface area was measured as in example 1 and the test results of the inventive examples are shown in Table 3.
TABLE 3 influence of fluidization chamber temperature on specific surface area of high specific surface area slaked lime prepared
| Fluidization chamber temperature | Specific surface (m) 2 /g) | Percentage of relative error |
| 32.5℃ | 34.66 | ±0.2％ |
| 35℃ | 40.58 | ±0.2％ |
| 37.5℃ | 43.74 | ±0.1％ |
| 40℃ | 48.47 | ±0.1％ |
| 80℃ | 50.24 | ±0.1％ |
| 120℃ | 51.62 | ±0.1％ |
| 130℃ | 46.46 | ±0.1％ |
| 140℃ | 42.91 | ±0.1％ |
| 150℃ | 40.53 | ±0.1％ |
As can be seen from table 3, when the fluidization chamber temperature is less than 40 ℃ (as in table 3, fluidization chamber temperature=37.5 ℃, 35 ℃, 32.5 ℃ and lower values not listed in table 3),the fluidization chamber temperature is too low and the reaction is insufficient, resulting in a significant decrease in the prepared high specific surface slaked lime specific surface as the fluidization chamber temperature decreases. When the temperature of the fluidization chamber is equal to 40-120 ℃ (as in table 3, when the temperature of the fluidization chamber is=40 ℃, 80 ℃ and 120 ℃, the fine water mist can be suspended in the air for a long time, and can quickly absorb heat in the collision contact process with fluidized quicklime powder, so that the self-volume quick expansion is realized, the full contact of water molecules with quicklime particles through three-dimensional movement is facilitated, meanwhile, the isolation area formed by water vapor expansion can quickly release heat generated in the reaction process of calcium oxide and water vapor, so that the surface temperature of fluid particles is reduced to promote continuous reaction of calcium oxide and water, and meanwhile, the water vapor expansion pressure can promote hydrogen peroxide to be immersed into quicklime and slaked lime particles to be decomposed into water vapor and oxygen. Finally, the prepared slaked lime with high specific surface area has specific surface area of more than 48m 2 And/g. When the fluidization chamber temperature is greater than 120 ℃ (as in table 3, fluidization chamber temperature = 47.5 minutes, 50 minutes, 52.5 minutes, and higher values not listed in table 3), fluidization chamber temperature is too high, digestion exotherm is significantly inhibited, resulting in a significant decrease in the prepared high specific surface slaked lime specific surface as fluidization chamber temperature increases further. Overall, the benefits combined with the costs, are most advantageous for increasing the specific surface of the slaked lime produced when the fluidization chamber temperature is equal to 40-120 ℃.
Comparative example influence of different processes on the specific surface of the prepared high specific surface slaked lime
The process comprises the following steps: mixing water and hydrogen peroxide to prepare 0.2% concentration hydrogen peroxide solution. Introducing hydrogen peroxide water solution into a high-pressure fine water mist generator to prepare fine water mist, wherein the action pressure of the high-pressure fine water mist generator is 20MPa, and the accumulated volume distribution D of mist drops V0.99 <20 μm. Spraying high-pressure fine water mist into a fluidization chamber to react with fluidized quicklime powder in the fluidization chamber, mixing for 45 minutes, guiding out from a port of the fluidization chamber, and performing gas-solid separation by a spiral separator to obtain gas for recycling, wherein the solid is separated powder, the liquid-solid ratio of hydrogen peroxide aqueous solution to the fluidized quicklime powder is 1.2:1mL/g, the fluidization gas is nitrogen, and the temperature of the fluidization chamber is 120 ℃. Further drying the separated powder to obtain a powderThe water content is 0.5%, and the obtained dry powder is the slaked lime with high specific surface area, wherein the drying temperature is 250 ℃.
Comparison Process 1: introducing the aqueous solution into a high pressure fine water mist generator with an operating pressure of 20MPa, and collecting the droplets with a cumulative volume distribution D V0.99 <20 μm. Spraying high-pressure fine water mist into a fluidization chamber to react with fluidized quicklime powder in the fluidization chamber, mixing for 45 minutes, guiding out from a port of the fluidization chamber, and performing gas-solid separation by a spiral separator to obtain gas for recycling, wherein the solid is separated powder, the liquid-solid ratio of the aqueous solution to the fluidized quicklime powder is 1.2:1mL/g, the fluidization gas is nitrogen, and the temperature of the fluidization chamber is 120 ℃. The separated powder is further dried to make the water content in the powder be 0.5%, and the obtained dried powder is the slaked lime with high specific surface area, wherein the drying temperature is 250 ℃.
Comparison process 2: mixing water and hydrogen peroxide to prepare 0.2% concentration hydrogen peroxide solution. And (3) introducing the aqueous solution of hydrogen peroxide into a water mist generator to manufacture water mist, wherein the action pressure of the water mist generator is normal pressure. Spraying water mist into a fluidization chamber to react with fluidized quicklime powder in the fluidization chamber, mixing for 45 minutes, guiding out from a port of the fluidization chamber, and performing gas-solid separation by a spiral separator to obtain gas for recycling, wherein the solid is separation powder, the liquid-solid ratio of hydrogen peroxide aqueous solution to the fluidized quicklime powder is 1.2:1mL/g, the fluidization gas is nitrogen, and the temperature of the fluidization chamber is 120 ℃. The separated powder is further dried to make the water content in the powder be 0.5%, and the obtained dried powder is the slaked lime with high specific surface area, wherein the drying temperature is 250 ℃.
The slaked lime specific surface area was measured as in example 1 and the test results of the inventive examples are shown in Table 4.
TABLE 4 influence of different processes on specific surface of the high specific surface slaked lime prepared
| Type of process | Specific surface (m) 2 /g) | Percentage of relative error |
| The process of the invention | 51.62 | ±0.1％ |
| Comparative Process 1 | 23.36 | ±0.1％ |
| Comparative Process 2 | 19.85 | ±0.1％ |
As can be seen from table 4, the specific surface of the slaked lime prepared by the process of the present invention is significantly higher than that of comparative process 1 and comparative process 2.
Claims (10)
1. A lime slaking process for preparing slaked lime having a high specific surface area, comprising the steps of:
(1) Introducing hydrogen peroxide aqueous solution into a high-pressure fine water mist generator to prepare high-pressure fine water mist, spraying the high-pressure fine water mist into a fluidization chamber to react with fluidized quicklime powder in the fluidization chamber, and then guiding out reactants;
(2) Carrying out gas-solid separation on the derived reactant, recycling the obtained gas, and leading the gas back to the fluidization chamber for continuously fluidizing the quicklime, wherein the solid is separation powder;
(3) And further drying the separated powder to obtain dried powder, namely the slaked lime with high specific surface area.
2. The lime slaking method for preparing slaked lime with high specific surface area according to claim 1, wherein the concentration of the aqueous hydrogen peroxide solution in the step (1) is 0.02% -0.2%.
3. The lime slaking method for producing slaked lime with a high specific surface area according to claim 1, wherein the high-pressure fine water mist generator in step (1) is operated at a pressure of 10 to 20MPa, and the cumulative volume distribution of droplets of the high-pressure fine water mist generator is set to D V0.99 <20～100μm。
4. The lime slaking method for preparing slaked lime with high specific surface area according to claim 1, wherein the liquid-solid ratio of the aqueous hydrogen peroxide solution to the fluidized quicklime powder in the step (1) is 1-1.2:1 ml/g.
5. The lime slaking method for preparing slaked lime with high specific surface area according to claim 1, wherein the reaction time of the high-pressure fine water mist and the fluidized quicklime powder in the step (1) is 5 to 45 minutes.
6. The lime slaking process for producing slaked lime having a high specific surface area according to claim 1, wherein the solid-liquid separation in step (2) is performed using a spiral separator.
7. The lime slaking method for producing slaked lime with a high specific surface area according to claim 1, wherein the gas for fluidizing quicklime in the fluidizing chamber in the step (2) is nitrogen gas, and the temperature of the fluidizing chamber is 40 to 120 ℃.
8. The lime slaking process for preparing slaked lime having a high specific surface area according to claim 1, wherein the further drying in step (3) is performed at a temperature of 50 to 250 ℃, and the water content of the slaked lime having a high specific surface area is 0.5 to 1.5%.
9. The lime slaking process for producing high specific surface area slaked lime according to claim 1, wherein the high specific surface area slaked lime obtained in step (3)The specific surface of (2) is 42-52 m 2 /g。
10. Slaked lime with high specific surface area, obtainable by a slaking process according to any one of claims 1 to 8.
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|---|---|---|---|---|
| JP2004168595A (en) * | 2002-11-20 | 2004-06-17 | Ube Material Industries Ltd | Method for manufacturing slaked lime |
| WO2014091081A1 (en) * | 2012-12-12 | 2014-06-19 | Kautar Oy | Apparatus and process for the dry-hydration of calcium oxide |
| CN108285280A (en) * | 2018-03-28 | 2018-07-17 | 董小琳 | A kind of preparation method of food-grade calcium hydroxide |
| CN114618291A (en) * | 2020-12-10 | 2022-06-14 | 西南科技大学 | Dry digestion and flue gas desulfurization integrated process of quicklime |
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| JP2004168595A (en) * | 2002-11-20 | 2004-06-17 | Ube Material Industries Ltd | Method for manufacturing slaked lime |
| WO2014091081A1 (en) * | 2012-12-12 | 2014-06-19 | Kautar Oy | Apparatus and process for the dry-hydration of calcium oxide |
| CN108285280A (en) * | 2018-03-28 | 2018-07-17 | 董小琳 | A kind of preparation method of food-grade calcium hydroxide |
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