CN114950096A - Calcium hydroxide dechlorinating agent and preparation method and application thereof - Google Patents

Calcium hydroxide dechlorinating agent and preparation method and application thereof Download PDF

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Publication number
CN114950096A
CN114950096A CN202210902143.6A CN202210902143A CN114950096A CN 114950096 A CN114950096 A CN 114950096A CN 202210902143 A CN202210902143 A CN 202210902143A CN 114950096 A CN114950096 A CN 114950096A
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calcium hydroxide
dechlorinating
dechlorinating agent
temperature
dechlorination
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岳朴杰
宁翔
孟磊
申镇
白玉勇
张国柱
李文龙
段钰锋
刘晓硕
袁照威
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Datang Environment Industry Group Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/68—Halogens or halogen compounds
    • B01D53/685—Halogens or halogen compounds by treating the gases with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/40—Alkaline earth metal or magnesium compounds
    • B01D2251/404—Alkaline earth metal or magnesium compounds of calcium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/60—Inorganic bases or salts
    • B01D2251/604—Hydroxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/20—Halogens or halogen compounds
    • B01D2257/204—Inorganic halogen compounds
    • B01D2257/2045—Hydrochloric acid

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

The invention provides a calcium hydroxide dechlorinating agent and a preparation method and application thereof. The preparation method of the calcium hydroxide dechlorinating agent comprises the following steps: s1: mixing a calcium oxide raw material, deionized water and absolute ethyl alcohol, and then carrying out digestion treatment to obtain a digestion mixture; s2: drying, crushing and sieving the digested mixture to obtain a calcium hydroxide dechlorinating agent; wherein the mass ratio of the deionized water to the absolute ethyl alcohol is 2: (0.05-2). The calcium hydroxide dechlorinating agent disclosed by the invention is high in specific surface area, small in average pore size, developed in pores, beneficial to exposing active sites, high in dechlorinating efficiency, good in low-temperature dechlorinating effect and the like, and also has excellent sulfur dioxide resistance.

Description

Calcium hydroxide dechlorinating agent and preparation method and application thereof
Technical Field
The invention relates to the technical field of dechlorination, in particular to a calcium hydroxide dechlorinating agent and a preparation method and application thereof.
Background
In the process of burning coal, more than 90 percent of chlorine in the coal is volatilized into flue gas in the form of hydrogen chloride. In the wet dechlorination device, more than 92% of chloride ions come from coal-fired flue gas, and the chloride in the flue gas is absorbed by the desulfurization slurry and enriched in the desulfurization slurry, so that the content of the chloride ions in the desulfurization slurry is continuously increased, and after the chloride ions exceed a certain concentration, the desulfurization wastewater needs to be discharged periodically. The increase of the concentration of chloride ions in the desulfurization slurry can not only reduce the utilization rate and desulfurization efficiency of the desulfurizer and cause equipment corrosion, but also seriously reduce the quality of desulfurization byproduct gypsum and influence the safe and stable operation of a desulfurization device.
The hydrogen chloride can be removed from the source by flue gas dechlorination, the chloride concentration entering the desulfurizing tower is reduced, and then the reduction of the desulfurization waste water and the improvement of the desulfurization gypsum quality are realized. The flue gas dechlorination is to spray a dechlorinating agent into a flue, fully mix with the flue gas and perform acid-base neutralization reaction to remove hydrogen chloride, and the chlorine salt of a reaction product is removed by a dust removal device, so that the concentration of chloride ions entering a desulfurizing tower is greatly reduced, the amount of wastewater generated during desulfurization is greatly reduced, and the content of chloride ions in gypsum is reduced.
Compared with a desulfurization wastewater dechlorination technology, the flue gas dechlorination technology has the advantages of simple system, low cost, high dechlorination efficiency, small occupied area, no waste liquid generation, small flue gas temperature drop and the like, and the dechlorination calcium-based dechlorination agent does not influence the quality of fly ash and can realize the reduction of the desulfurization wastewater. However, the existing calcium-based dechlorinating agent has low dechlorinating efficiency at the temperature of 150-; in addition, due to smokeIn which large amounts of SO are also present 2 ，SO 2 The atmosphere may adversely affect the dechlorination effect of the dechlorination agent, and further affect the dechlorination effect of the dechlorination agent.
In view of this, the invention is particularly proposed.
Disclosure of Invention
The calcium hydroxide dechlorinating agent has the advantages of high specific surface area, small average pore diameter, developed pores, contribution to exposing active sites, high dechlorinating efficiency, good low-temperature dechlorinating effect and the like, and also has excellent sulfur dioxide resistance.
The invention provides a preparation method of a calcium hydroxide dechlorinating agent, which comprises the following steps:
s1: mixing a calcium oxide raw material, deionized water and absolute ethyl alcohol, and then carrying out digestion treatment to obtain a digestion mixture;
s2: drying, crushing and sieving the digested mixture to obtain a calcium hydroxide dechlorinating agent;
wherein the mass ratio of the deionized water to the absolute ethyl alcohol is 2: (0.05-2), preferably 2: (0.4-1.2), more preferably 2: (0.8-1.2).
The research finds that: the calcium oxide raw material is treated by adopting the ethanol solution with specific volume concentration, so that the specific surface area of the calcium hydroxide dechlorinating agent can be obviously improved, the average pore diameter of the calcium hydroxide dechlorinating agent is reduced, the specific surface area of the dechlorinating agent after digestion treatment is more developed, the micropore active sites are more abundant, the chemical activity is obviously enhanced, and the removal of hydrogen chloride is facilitated; the reason for this may be: the ethanol has smaller surface tension and dielectric constant, can reduce the surface tension of precipitated particles and the dielectric constant of the whole solution, so that the solubility of a solute is reduced, the supersaturation degree of the solute is improved, the precipitated particles with smaller particle size are finally formed, and the dechlorination efficiency and the low-temperature dechlorination effect of the dechlorination agent can be obviously improved.
In step S1, the mass ratio of the calcium oxide raw material, the deionized water, and the absolute ethyl alcohol may be 1: 2: (0.05-2), preferably 1: 2: (0.4-1.2), more preferably 1: 2: (0.8-1.2).
Digestion treatment conditions are not strictly limited; specifically, the digestion treatment temperature may be 10 to 80 ℃, preferably 10 to 70 ℃, and more preferably 30 to 70 ℃; the digestion treatment time can be 15-35 min. The digestion treatment may be carried out under stirring, and the mixture after the digestion treatment is in a semi-dry state.
In step S2, the drying temperature can be 90-120 ℃, and the drying time can be 10-20 h; the invention does not strictly limit the crushing mode and the size of the crushed particles, and the crushing mode can adopt the conventional modes such as grinding and the like, and the sieving mode can be 20-40 meshes.
In one embodiment, the calcium hydroxide dechlorinating agent is prepared by the following steps:
1) according to the mass ratio of calcium oxide raw material, deionized water and absolute ethyl alcohol of 1: 2: (0.05-2) weighing raw materials, firstly mixing deionized water and ethanol, fully and uniformly stirring, and then preserving the temperature of the prepared ethanol solution at 10-80 ℃ for 10-20 min;
2) slowly introducing the calcium oxide raw material weighed in the step 1) into the heat-preservation ethanol solution, preserving the heat at 10-80 ℃, stirring for 15-35min, and evaporating the water in the ethanol solution to form a viscous milky semi-dry sample;
3) drying the milky white semi-dry sample obtained in the step 2) at 90-120 ℃ for 10-20h until completely drying to obtain a dry massive solid;
4) grinding the dried massive solid obtained in the step 3) on a mortar and sieving the ground massive solid with a 20-40-mesh sieve to obtain the calcium hydroxide dechlorinating agent.
After the treatment, the average pore diameter of the prepared calcium hydroxide dechlorinating agent is 8-16nm, preferably 8-13nm, and more preferably 8-11 nm; the specific surface area is 24-67m 2 Per g, preferably from 34 to 67m 2 Per g, more preferably 44 to 67m 2 (ii) in terms of/g. The calcium hydroxide dechlorinating agent has advantages of developed pores, strong chemical activity, small particle, strong dechlorinating performance and SO resistance 2 Ability to compete for the reaction.
The invention also provides a calcium hydroxide dechlorinating agent prepared by the preparation method.
The invention also provides the application of the calcium hydroxide dechlorinating agent in dechlorination.
The invention also provides a flue gas dechlorination method, which adopts the calcium hydroxide dechlorination agent to dechlorinate the flue gas; wherein the temperature during dechlorination is 100-600 ℃.
Furthermore, the flue gas also contains sulfur dioxide gas; the calcium hydroxide dechlorinating agent can be used for dechlorinating in a sulfur dioxide atmosphere and has excellent sulfur dioxide resistance.
The implementation of the invention has at least the following advantages:
1. the calcium hydroxide dechlorinating agent has the advantages of simple preparation process, low cost and easy large-scale production and industrial application;
2. the calcium hydroxide dechlorinating agent has the advantages of high specific surface area, small average pore diameter, developed pores, rich surface free radicals, strong chemical activity, stronger dechlorinating performance and SO resistance 2 The capacity of competitive reaction, especially the low-temperature dechlorination effect is excellent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a scanning electron micrograph of different dechlorinating agents; wherein: a. d is a calcium oxide raw material; b. e is the calcium hydroxide dechlorinating agent of example 2; c. f is calcium hydroxide dechlorinating agent of example 1.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms also include the plural forms unless the context clearly dictates otherwise, and further, it is understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the stated features, steps, operations, devices, components, and/or combinations thereof.
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
According to the mass ratio of calcium oxide raw material, deionized water and absolute ethyl alcohol of 1: 2: 1.2 weigh the starting materials. Firstly, uniformly mixing weighed deionized water and absolute ethyl alcohol to prepare an ethanol solution, placing the prepared ethanol solution in a water bath kettle, setting the temperature of a thermostatic water bath to be 70 ℃, and keeping the temperature for 15 min. And then, slowly introducing the weighed calcium oxide raw material into the prepared ethanol solution, keeping the water bath temperature at 70 ℃, simultaneously matching with magnetic stirring, and evaporating water after 30min to obtain a viscous milky semi-dry sample. The obtained semi-dry sample is put into a constant-temperature oven with the temperature of 105 ℃ for drying for 15h until being completely dried. And grinding the obtained dried blocky solid on a mortar and sieving the grinded blocky solid by a 20-mesh sieve to obtain the calcium hydroxide dechlorinating agent.
Detecting the average pore diameter of the dechlorinating agent by adopting a BJH method; detecting the specific surface area of the dechlorinating agent by adopting a BET method; the results are shown in Table 1.
In addition, the scanning electron micrographs of the calcium oxide starting material and the calcium hydroxide dechlorinating agent are shown in FIG. 1; as can be seen from the scanning electron microscope results of FIG. 1, the calcium hydroxide dechlorinating agent prepared in this example has a more dispersed physical morphology compared with the calcium oxide raw material (a in FIG. 1 and d in FIG. 1); after further amplification, the calcium hydroxide dechlorinating agent has smaller pore diameter and more developed pores, is beneficial to exposing active sites and further improves dechlorinating effect (c in figure 1 and f in figure 1).
Example 2
According to the mass ratio of calcium oxide raw material, deionized water and absolute ethyl alcohol of 1: 2: 0.8 weigh the raw materials. Firstly, uniformly mixing weighed deionized water and absolute ethyl alcohol to prepare an ethanol solution, placing the prepared ethanol solution in a water bath kettle, setting the temperature of a thermostatic water bath to be 70 ℃, and keeping the temperature for 15 min. And then, slowly introducing the weighed calcium oxide raw material into the prepared ethanol solution, keeping the water bath temperature at 70 ℃, simultaneously matching with magnetic stirring, and evaporating water after 30min to obtain a viscous milky semi-dry sample. The obtained semi-dry sample is put into a constant-temperature oven with the temperature of 105 ℃ for drying for 15h until being completely dried. Grinding the obtained dried massive solid on a mortar and sieving the ground massive solid with a 20-mesh sieve to obtain a calcium hydroxide dechlorinating agent; the results of the tests carried out in example 1 are shown in Table 1.
The scanning electron micrograph of the calcium hydroxide dechlorinating agent of the embodiment is shown in figure 1; the scanning electron microscope image shows that the calcium hydroxide dechlorinating agent prepared by the embodiment has a dispersed physical appearance, small pore diameter and developed pores, and is beneficial to exposing active sites, so that the dechlorinating effect is improved (b in the figure 1 and e in the figure 1).
Example 3
According to the mass ratio of calcium oxide raw material, deionized water and absolute ethyl alcohol of 1: 2: 1.2 weigh the starting materials. Firstly, uniformly mixing weighed deionized water and absolute ethyl alcohol to prepare an ethanol solution, placing the prepared ethanol solution in a water bath kettle, setting the temperature of a thermostatic water bath to be 50 ℃, and keeping the temperature for 15 min. And then, slowly introducing the weighed calcium oxide raw material into the prepared ethanol solution, keeping the water bath temperature at 50 ℃, simultaneously matching with magnetic stirring, and evaporating water after 30min to obtain a viscous milky semi-dry sample. The obtained semi-dry sample is put into a constant-temperature oven with the temperature of 105 ℃ for drying for 15h until being completely dried. Grinding the obtained dried massive solid on a mortar and sieving the ground massive solid with a 20-mesh sieve to obtain a calcium hydroxide dechlorinating agent; the results of the tests carried out in example 1 are shown in Table 1.
Example 4
According to the mass ratio of calcium oxide raw material, deionized water and absolute ethyl alcohol of 1: 2: 1.2 weigh the starting materials. Firstly, uniformly mixing weighed deionized water and absolute ethyl alcohol to prepare an ethanol solution, placing the prepared ethanol solution in a water bath kettle, setting the temperature of a thermostatic water bath to be 30 ℃, and keeping the temperature for 15 min. And then, slowly introducing the weighed calcium oxide raw material into the prepared ethanol solution, keeping the water bath temperature at 30 ℃, simultaneously matching with magnetic stirring, and after 30min, evaporating water to obtain a viscous milky semi-dry sample. The obtained semi-dry sample is put into a constant-temperature oven with the temperature of 105 ℃ for drying for 15h until being completely dried. Grinding the obtained dried massive solid on a mortar and sieving the ground massive solid with a 20-mesh sieve to obtain a calcium hydroxide dechlorinating agent; the results of the measurements carried out in example 1 are shown in Table 1.
Example 5
According to the mass ratio of calcium oxide raw material, deionized water and absolute ethyl alcohol of 1: 2: 1.2 weigh the starting materials. Firstly, uniformly mixing weighed deionized water and absolute ethyl alcohol to prepare an ethanol solution, placing the prepared ethanol solution in a water bath kettle, setting the temperature of a thermostatic water bath to be 10 ℃, and keeping the temperature for 15 min. And then, slowly introducing the weighed calcium oxide raw material into the prepared ethanol solution, keeping the water bath temperature at 10 ℃, simultaneously matching with magnetic stirring, and evaporating water after 30min to obtain a viscous milky semi-dry sample. The obtained semi-dry sample is put into a constant-temperature oven with the temperature of 105 ℃ for drying for 15h until being completely dried. Grinding the obtained dried massive solid on a mortar and sieving the ground massive solid with a 20-mesh sieve to obtain a calcium hydroxide dechlorinating agent; the results of the tests carried out in example 1 are shown in Table 1.
Example 6
According to the mass ratio of calcium oxide raw material, deionized water and absolute ethyl alcohol of 1: 2: 0.4 weigh the starting materials. Firstly, uniformly mixing weighed deionized water and absolute ethyl alcohol to prepare an ethanol solution, placing the prepared ethanol solution in a water bath kettle, setting the temperature of a thermostatic water bath to be 70 ℃, and keeping the temperature for 15 min. And then, slowly introducing the weighed calcium oxide raw material into the prepared ethanol solution, keeping the water bath temperature at 70 ℃, simultaneously matching with magnetic stirring, and evaporating water after 30min to obtain a viscous milky semi-dry sample. The obtained semi-dry sample is put into a constant-temperature oven with the temperature of 105 ℃ for drying for 15h until being completely dried. Grinding the obtained dried massive solid on a mortar and sieving the ground massive solid with a 20-mesh sieve to obtain a calcium hydroxide dechlorinating agent; the results of the tests carried out in example 1 are shown in Table 1.
Comparative example 1
According to the mass ratio of calcium oxide raw materials to deionized water of 1: 2 weigh the raw materials. Firstly, deionized water is placed in a water bath kettle, the temperature of the thermostatic water bath is set to be 70 ℃, and the temperature is kept for 15 min. And then, slowly introducing the weighed calcium oxide raw material into heat-preservation deionized water, keeping the temperature of the water bath at 70 ℃, simultaneously matching with magnetic stirring, and evaporating water after 30min to obtain a viscous milky semi-dry sample. The obtained semi-dry sample is put into a constant-temperature oven with the temperature of 105 ℃ for drying for 15h until being completely dried. Grinding the obtained dried massive solid on a mortar and sieving the ground massive solid with a 20-mesh sieve to obtain a calcium hydroxide dechlorinating agent; the results of the tests carried out in example 1 are shown in Table 1.
Comparative example 2
According to the mass ratio of calcium oxide raw materials to absolute ethyl alcohol of 1: 0.8 weigh the raw materials. Firstly, absolute ethyl alcohol is placed in a water bath kettle, the temperature of the thermostatic water bath is set to be 70 ℃, and the temperature is kept for 15 min. And then, slowly introducing the weighed calcium oxide raw material into heat-insulating absolute ethyl alcohol, keeping the water bath temperature at 70 ℃, simultaneously matching with magnetic stirring, and changing the solution into a semi-dry sample after 30 min. The obtained semi-dry sample is put into a constant-temperature oven with the temperature of 105 ℃ for drying for 15h until being completely dried. Grinding the obtained dried massive solid on a mortar and sieving the ground massive solid with a 20-mesh sieve to obtain a calcium oxide dechlorinating agent; the results of the tests carried out in example 1 are shown in Table 1.
Comparative example 3
According to the mass ratio of calcium oxide raw material, deionized water and absolute ethyl alcohol of 1: 0.2: 2 weigh the raw materials. Firstly, uniformly mixing weighed deionized water and absolute ethyl alcohol to prepare an ethanol solution, placing the prepared ethanol solution in a water bath kettle, setting the temperature of a thermostatic water bath to be 70 ℃, and keeping the temperature for 15 min. And then, slowly introducing the weighed calcium oxide raw material into the prepared ethanol solution, keeping the water bath temperature at 70 ℃, simultaneously matching with magnetic stirring, and evaporating water after 30min to obtain a viscous milky semi-dry sample. The obtained semi-dry sample is put into a constant-temperature oven with the temperature of 105 ℃ for drying for 15h until being completely dried. Grinding the obtained dried massive solid on a mortar and sieving the ground massive solid with a 20-mesh sieve to obtain a calcium hydroxide dechlorinating agent; the results of the tests carried out in example 1 are shown in Table 1.
Comparative example 4
According to the mass ratio of calcium oxide raw material, deionized water and sodium hydroxide of 1: 2: 0.1 weigh the starting materials. Firstly, uniformly mixing weighed deionized water and sodium hydroxide to prepare a sodium hydroxide solution, placing the prepared sodium hydroxide solution in a water bath kettle, setting the temperature of the thermostatic water bath to be 70 ℃, and keeping the temperature for 15 min. Slowly introducing the weighed calcium oxide raw material into the prepared sodium hydroxide solution, keeping the water bath temperature at 70 ℃, simultaneously matching with magnetic stirring, and evaporating water after 30min to obtain a viscous milky semi-dry sample. The obtained semi-dry sample is put into a constant-temperature oven with the temperature of 105 ℃ for drying for 15h until being completely dried. Grinding the obtained dried massive solid on a mortar and sieving the ground massive solid with a 30-mesh sieve to obtain a calcium hydroxide dechlorinating agent; the results of the tests carried out in example 1 are shown in Table 1.
TABLE 1 quality test results of dechlorinating agents
Figure DEST_PATH_IMAGE001
Test example 1
The dechlorinating agents of the examples and the comparative examples were placed on a fixed bed laboratory bench to conduct dechlorination characteristic tests. Under the fixed bed temperature of 150 ℃, the total gas amount is uniformly controlled to be 1000mL/min, the HCl concentration is 150ppm, the inner diameter of a quartz reactor is 8mm, the dosage of a dechlorinating agent is 0.1g, the carrier gas is high-purity nitrogen, and the dechlorinating treatment time is 150 min. The dechlorination effect was evaluated using the removal rate = (1-penetration) × 100%, where the penetration rate is defined as the ratio of the amount of chloride ions enriched at the outlet across the reactor to the total amount of chloride ions in HCl over the test time; the results are shown in Table 2.
TABLE 2 removal rate of dechlorinating agents
Figure DEST_PATH_IMAGE002
Test example 2
The dechlorination agents prepared in each example and each control example were placed on a fixed bed bench to test their dechlorinated sulfur resistance characteristics. Keeping the temperature of the fixed bed at 150 ℃, uniformly controlling the total gas amount to be 1000mL/min, controlling the HCl concentration to be 150ppm, controlling the inner diameter of the quartz reactor to be 8mm, using the adsorbent in an amount of 0.1g, using the carrier gas as high-purity nitrogen, simultaneously adding sulfur dioxide gas with different volume concentrations, and performing offline dechlorination for 150 min. The dechlorination effect is evaluated by adopting a removal rate which is = (1-penetration rate) × 100%; the results are shown in Table 3.
TABLE 3 Desorption Rate of dechlorinating agents at different Sulfur dioxide concentrations
Figure DEST_PATH_IMAGE003
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The preparation method of the calcium hydroxide dechlorinating agent is characterized by comprising the following steps:
s1: mixing a calcium oxide raw material, deionized water and absolute ethyl alcohol, and then carrying out digestion treatment to obtain a digestion mixture;
s2: drying, crushing and sieving the digested mixture to obtain a calcium hydroxide dechlorinating agent;
wherein the mass ratio of the deionized water to the absolute ethyl alcohol is 2: (0.05-2).
2. The preparation method according to claim 1, wherein in step S1, the mass ratio of the calcium oxide raw material, the deionized water and the absolute ethyl alcohol is 1: 2: (0.05-2).
3. The method according to claim 1, wherein in step S1, the digestion temperature is 10-80 ℃ and the digestion time is 15-35 min.
4. The method according to claim 1, wherein the drying temperature is 90 to 120 ℃ and the drying time is 10 to 20 hours in step S2.
5. The method according to claim 1, wherein in step S2, the pulverization is carried out by grinding and the sieving is carried out by a 20-40 mesh sieve.
6. The method according to claim 1, wherein in step S2, the calcium hydroxide dechlorinating agent has an average pore size of 8 to 16 nm; the specific surface area is 24-67m 2 /g。
7. A calcium hydroxide dechlorinating agent prepared by the method according to any one of claims 1 to 6.
8. Use of a calcium hydroxide dechlorinating agent according to claim 7 in dechlorination.
9. A flue gas dechlorination method, characterized in that the calcium hydroxide dechlorination agent of claim 7 is used for dechlorinating the flue gas; wherein the temperature during dechlorination is 100-600 ℃.
10. The flue gas dechlorination method of claim 9, wherein the flue gas further comprises sulfur dioxide gas.
CN202210902143.6A 2022-07-29 2022-07-29 Calcium hydroxide dechlorinating agent and preparation method and application thereof Pending CN114950096A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09103640A (en) * 1995-10-06 1997-04-22 Okutama Kogyo Kk Method and agent for treating exhaust gas
JP2000063116A (en) * 1998-08-14 2000-02-29 Okutama Kogyo Co Ltd New calcium hydroxide, its production and acidic gas- treating agent including the same as effective component
US20020006372A1 (en) * 2000-05-08 2002-01-17 Tomio Sugimoto Sodium-based dechlorinating agent and waste treatment equipment
CN110624381A (en) * 2018-06-25 2019-12-31 沈阳三聚凯特催化剂有限公司 Gas-phase dechlorinating agent and preparation method thereof
CN113443754A (en) * 2021-08-30 2021-09-28 大唐环境产业集团股份有限公司 Pretreatment method of sintering flue gas desulfurization wastewater
CN114100360A (en) * 2021-11-15 2022-03-01 中国铝业股份有限公司 Desulfurizing agent and preparation method thereof
CN114392643A (en) * 2021-12-30 2022-04-26 北京北科环境工程有限公司 Preparation method of dechlorinating agent for blast furnace gas

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09103640A (en) * 1995-10-06 1997-04-22 Okutama Kogyo Kk Method and agent for treating exhaust gas
JP2000063116A (en) * 1998-08-14 2000-02-29 Okutama Kogyo Co Ltd New calcium hydroxide, its production and acidic gas- treating agent including the same as effective component
US20020006372A1 (en) * 2000-05-08 2002-01-17 Tomio Sugimoto Sodium-based dechlorinating agent and waste treatment equipment
CN110624381A (en) * 2018-06-25 2019-12-31 沈阳三聚凯特催化剂有限公司 Gas-phase dechlorinating agent and preparation method thereof
CN113443754A (en) * 2021-08-30 2021-09-28 大唐环境产业集团股份有限公司 Pretreatment method of sintering flue gas desulfurization wastewater
CN114100360A (en) * 2021-11-15 2022-03-01 中国铝业股份有限公司 Desulfurizing agent and preparation method thereof
CN114392643A (en) * 2021-12-30 2022-04-26 北京北科环境工程有限公司 Preparation method of dechlorinating agent for blast furnace gas

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Application publication date: 20220830