CN112755747A - Instant magnesium hydroxide desulfurizer - Google Patents
Instant magnesium hydroxide desulfurizer Download PDFInfo
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- CN112755747A CN112755747A CN202011483883.8A CN202011483883A CN112755747A CN 112755747 A CN112755747 A CN 112755747A CN 202011483883 A CN202011483883 A CN 202011483883A CN 112755747 A CN112755747 A CN 112755747A
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- magnesium hydroxide
- desulfurizer
- instant
- hydroxide desulfurizer
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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
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
-
- 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
- B01D2251/402—Alkaline earth metal or magnesium compounds of magnesium
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The invention discloses an instant magnesium hydroxide desulfurizer and a preparation method thereof, wherein the main components of the magnesium hydroxide desulfurizer are magnesium hydroxide, sodium bicarbonate and citric acid; wherein the molar ratio of the magnesium hydroxide, the sodium bicarbonate and the citric acid is (10-100) to 1:1, and the median particle size is less than 5 microns. The magnesium hydroxide desulfurizer powder prepared by the invention contacts with water to release gas in situ, so that rapid dispersion is realized; the water-retaining agent can be directly used without a hydration process; the desulfurization activity is higher, and a desulfurizing agent is saved; the content of residual desulfurizer in the waste residue is reduced, and the generation amount of solid waste is reduced. Convenient use, simplified process and reduced energy consumption in the pulping process.
Description
Technical Field
The invention relates to the technical field of powder preparation, in particular to an instant magnesium hydroxide desulfurizer.
Background
The magnesium method flue gas desulfurization process is widely adopted abroad, but is still in the beginning stage in China. With the coming of more severe environmental protection standards, the method has the potential of replacing the traditional limestone-lime process in recent years due to rapid development in China. The magnesium desulfurization process usually adopts magnesium oxide as a desulfurizing agent, and magnesium hydroxide slurry is prepared by stirring for a long time and hydrating. However, in the actual operation process, the incomplete hydration phenomenon of magnesium oxide generally exists, so that the activity of the desulfurizer is low, and the desulfurizer is not completely utilized and is discharged along with waste residues.
The magnesium hydroxide with stronger desulfurization activity is directly adopted, however, the magnesium hydroxide powder has stronger surface energy, hard agglomeration is easy to occur in the drying process, a large-block precipitate can be formed when the magnesium hydroxide powder is prepared into a solution again, the magnesium hydroxide powder is difficult to be uniformly dissolved in slurry, the available desulfurizer slurry can be formed by long-time and high-power stirring, and the high efficiency and the practicability of the magnesium hydroxide desulfurizer are limited.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the instant magnesium hydroxide desulfurizer and the preparation method thereof.
The invention provides a preparation method of the instant magnesium hydroxide desulfurizer, which comprises the following steps: weighing the raw materials according to the mass ratio (500-5000) to 1:1 of magnesium hydroxide, sodium bicarbonate and citric acid, and uniformly stirring the raw materials at the temperature of 15-70 ℃ and the stirring speed of 300-10000 rpm to obtain magnesium hydroxide desulfurizer slurry;
for the technical scheme, the preparation method further comprises the step of filtering the magnesium hydroxide desulfurizer slurry by a filter press, wherein the filtering pressure is 0.2-2 MPa, and the filtering pore diameter is 300 meshes, so that a magnesium hydroxide desulfurizer filter cake with the particle size of less than 350 meshes is obtained.
For the technical scheme, the conditions for filtering the magnesium hydroxide desulfurizer slurry are that the filtering pressure is 0.2-2 MPa and the filtering pore size is 300 meshes;
for the technical scheme, the preparation method further comprises the step of crushing the magnesium hydroxide desulfurizer filter cake, wherein the particle size of the crushed magnesium hydroxide desulfurizer filter cake is 50-2500 micrometers, so that the wet magnesium hydroxide desulfurizer powder is obtained.
For the technical scheme, the preparation method further comprises the step of drying the wet magnesium hydroxide desulfurizer powder, wherein the drying temperature is 100-180 ℃, and collecting the dried powder by adopting a bag-type dust remover to obtain the instant magnesium hydroxide desulfurizer.
The invention also provides a quick-dissolving magnesium hydroxide desulfurizer obtained by the preparation method.
For the technical scheme, the main components of the instant magnesium hydroxide desulfurizer are magnesium hydroxide, sodium bicarbonate and citric acid; wherein the molar ratio of the magnesium hydroxide, the sodium bicarbonate and the citric acid is (10-100) to 1: 1.
For the above technical solution, further, the particle size of the fast dissolving magnesium hydroxide desulfurizer is less than 5 μm.
Compared with the prior art, the invention has the following advantages: the instant magnesium hydroxide desulfurizer powder disclosed by the invention contacts with water to release gas in situ, so that rapid dispersion is realized; the instant magnesium hydroxide desulfurizer does not need hydration process and can be directly used; the instant magnesium hydroxide desulfurizer has higher desulfurization activity and saves the desulfurizer; and the content of residual desulfurizer in the waste residue is reduced, and the generation amount of solid waste is reduced.
Drawings
FIG. 1 is a comparison of pH in solution with dispersion time in different embodiments, and shows that after the treatment by the method of the present invention, the pH value of the solution rises faster and the stable pH value is higher, thereby proving that the treated sample can be rapidly dissolved in water to release OH-, and the instant effect is achieved.
FIG. 2 is a comparison of the desulfurization breakthrough curves of example 1 and raw material magnesium hydroxide, and as shown in the figure, when the magnesium hydroxide prepared in example 1 is used for desulfurization, the time for reaching the excessive concentration of sulfur dioxide is longer, and the time for completely penetrating is longer, which shows that the magnesium hydroxide prepared in example 1 has higher desulfurization activity and higher utilization rate of a desulfurizing agent.
Detailed Description
In order to illustrate the present invention more clearly, the following examples are given without any limitation to the scope of the present invention.
The procedure used in the examples of this application for the preparation of the starting material magnesium hydroxide was to mix magnesium chloride with ammonia in a molar ratio of 1:2 to precipitate, filter out the precipitate, wash it several times and dry it at 105 ℃ for 2 hours to obtain a sample.
Example 1
Weighing 500kg of magnesium hydroxide, 1kg of sodium bicarbonate and 1kg of citric acid, mixing the weighed materials into 2000L of water at the temperature of 20 ℃ and the stirring speed of 500rpm to obtain slurry, preparing a filter cake from the slurry under the filtering pressure of 0.3MPa, grinding the filter cake to a wet material with the median particle size of 5 microns, drying the wet material at the temperature of 100 ℃, and collecting the dried powder through a bag-type dust collector to prepare the instant magnesium hydroxide desulfurizer, wherein the molar ratio of the magnesium hydroxide, the sodium bicarbonate and the citric acid in the instant magnesium hydroxide desulfurizer obtained in the embodiment is 10:1: 1.
Respectively putting 2g of the prepared instant magnesium hydroxide desulfurizer and the raw material magnesium hydroxide into 200ml of water, stirring for 10 minutes at 700rpm, measuring the pH value of the solution by using a pH meter, and measuring that the pH value of the slurry prepared by the instant magnesium hydroxide is 0.5 higher than that of the raw material product.
Example 2
Weighing 2500kg of magnesium hydroxide, 1kg of sodium bicarbonate and 1kg of citric acid, mixing the weighed materials into 2000L of water at the temperature of 20 ℃ and the stirring speed of 2500rpm to obtain slurry, preparing a filter cake from the slurry under the filtering pressure of 0.6MPa, grinding the filter cake to a wet material with the median particle size of 4 microns, drying the wet material at the temperature of 150 ℃, and collecting the dried powder through a bag-type dust collector to prepare the instant magnesium hydroxide desulfurizer, wherein the molar ratio of the magnesium hydroxide, the sodium bicarbonate and the citric acid in the instant magnesium hydroxide desulfurizer obtained in the embodiment is 50:1: 1.
Respectively putting 2g of the prepared instant magnesium hydroxide desulfurizer and the raw material magnesium hydroxide into 200ml of water, stirring for 10 minutes at 700rpm, measuring the pH value of the solution by using a pH meter, and measuring that the pH value of the slurry prepared by the instant magnesium hydroxide is 0.8 higher than that of the raw material product.
Example 3
Weighing 5000kg of magnesium hydroxide, 1kg of sodium bicarbonate and 1kg of citric acid, mixing the weighed materials into 2000L of water at the temperature of 20 ℃ and the stirring speed of 5000rpm to obtain slurry, preparing a filter cake from the slurry under the filtering pressure of 1.0MPa, grinding the filter cake to a wet material with the median particle size of 2.5 microns, drying the wet material at the temperature of 180 ℃, and collecting the dried powder through a bag-type dust collector to prepare the instant magnesium hydroxide desulfurizer, wherein the molar ratio of the magnesium hydroxide, the sodium bicarbonate and the citric acid in the instant magnesium hydroxide desulfurizer obtained in the embodiment is 100:1: 1.
Respectively putting 2g of the prepared instant magnesium hydroxide desulfurizer and the raw material magnesium hydroxide into 200ml of water, stirring for 10 minutes at 700rpm, measuring the pH value of the solution by using a pH meter, and measuring that the pH value of the slurry prepared by the instant magnesium hydroxide is 1.1 higher than that of the raw material product.
Comparative example 1 comparison of Effect with raw Material magnesium hydroxide
The same mass of magnesium hydroxide (magnesium chloride/ammonia synthesis) as the raw material and the instant magnesium hydroxide desulfurizer prepared in example 1 of the present invention were mixed under the same conditions of stirring intensity and stirring time, and then the pH of the solution was measured. And adding magnesium hydroxide suspension liquid with the same volume and concentration into the gas washing bottle, performing a sulfur dioxide absorption penetration experiment, comparing the time that the concentration of sulfur dioxide at the outlet of the gas washing bottle exceeds 20ppm and the time that the sulfur dioxide is completely penetrated, representing the activity and the utilization rate of the desulfurizer dissolved in water, and obtaining a desulfurization penetration curve. As can be seen from FIG. 2, when the concentration of sulfur dioxide at the inlet is 200ppm, the time t1 exceeding 20ppm at the outlet of the raw material magnesium hydroxide gas washing bottle is 680s, and the 20ppm breakthrough time t 1' of the instant magnesium hydroxide desulfurizer prepared in example 1 is 1050s, which indicates that the instant magnesium hydroxide desulfurizer prepared by the invention has higher desulfurization activity. From the complete penetration time, the complete penetration time t2 of the raw material magnesium hydroxide is 1280s, and the complete penetration time t 2' of the magnesium hydroxide prepared in the embodiment 1 of the invention is 1340s, which shows that the magnesium hydroxide prepared by the invention has higher desulfurization utilization rate and less residual amount of a desulfurizing agent, so that the desulfurization solid waste amount is reduced.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The preparation method of the instant magnesium hydroxide desulfurizer is characterized by comprising the following steps of weighing raw materials according to the mass ratio (500-5000) of magnesium hydroxide, sodium bicarbonate and citric acid to 1:1, and uniformly stirring the raw materials at 15-70 ℃ and 300-10000 rpm to obtain magnesium hydroxide desulfurizer slurry.
2. The preparation method of the instant magnesium hydroxide desulfurizer according to claim 1, characterized in that: the method also comprises the step of filtering the slurry of the magnesium hydroxide desulfurizer to obtain a filter cake of the magnesium hydroxide desulfurizer with the granularity of less than 350 meshes.
3. The preparation method of the instant magnesium hydroxide desulfurizer according to claim 2, characterized in that: the conditions for filtering the magnesium hydroxide desulfurizer slurry are that the filtering pressure is 0.2-2 MPa and the filtering aperture is 300 meshes.
4. The preparation method of the instant magnesium hydroxide desulfurizer according to claim 2, characterized in that: the method also comprises the step of crushing the magnesium hydroxide desulfurizer filter cake, wherein the particle size of the crushed magnesium hydroxide desulfurizer filter cake is 50-2500 microns, so that a wet magnesium hydroxide desulfurizer powder material is obtained.
5. The preparation method of the instant magnesium hydroxide desulfurizer according to claim 4, characterized in that: the method also comprises the step of drying the wet magnesium hydroxide desulfurizer powder at 100-180 ℃ to obtain the instant magnesium hydroxide desulfurizer.
6. The fast-dissolving magnesium hydroxide desulfurizer obtained by the preparation method according to claim 1.
7. The instant magnesium hydroxide desulfurizer according to claim 6, wherein: the magnesium hydroxide desulfurizer mainly comprises magnesium hydroxide, sodium bicarbonate and citric acid; wherein the molar ratio of the magnesium hydroxide, the sodium bicarbonate and the citric acid is (10-100) to 1: 1.
8. The instant magnesium hydroxide desulfurizer according to claim 6 or 7, wherein: the median particle size of the instant magnesium hydroxide desulfurizer is less than 5 microns.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011483883.8A CN112755747A (en) | 2020-12-15 | 2020-12-15 | Instant magnesium hydroxide desulfurizer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011483883.8A CN112755747A (en) | 2020-12-15 | 2020-12-15 | Instant magnesium hydroxide desulfurizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115337896A (en) * | 2022-07-22 | 2022-11-15 | 西南化工研究设计院有限公司 | Dry desulfurizing agent for ultralow emission of sulfonated tail gas and preparation method thereof |
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| JPH06191832A (en) * | 1992-12-22 | 1994-07-12 | Nasu Tooa Kk | Preparation of activated magnesium hydroxide |
| JPH0881216A (en) * | 1994-09-09 | 1996-03-26 | Daicel Amiboshi Sangyo Kk | Water suspension of magnesium hydroxide and its production |
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| KR20030054393A (en) * | 2001-12-24 | 2003-07-02 | 주식회사 포스코 | Slurry comprising magnesium hydroxide produced from seawater with high concentration |
| CN102120126A (en) * | 2011-02-17 | 2011-07-13 | 大连海事大学 | Preparation method of Mg(OH)2 slurry in marine desulfurization system by virtue of magnesium base-seawater method |
| JP2014214083A (en) * | 2013-04-30 | 2014-11-17 | 東南貿易株式会社 | Brucite-derived magnesium hydroxide slurry production method |
| CN105565782A (en) * | 2015-12-15 | 2016-05-11 | 营口镁质材料研究院有限公司 | Preparation method of magnesium hydrate suspension slurry for magnesium oxide sintered body target material |
| CN105771617A (en) * | 2016-03-22 | 2016-07-20 | 天津滨环化学工程技术研究院有限公司 | Flue gas desulfurization and denitrification method |
| US20160207788A1 (en) * | 2013-04-08 | 2016-07-21 | Tata Chemicals Limited | Redispersible magnesium hydroxide and a process for manufacturing the same |
| US20170225961A1 (en) * | 2016-02-04 | 2017-08-10 | Martin Marietta Magnesia Specialties, Llc | Process for producing a stabilized magnesium hydroxide slurry |
| CN110357131A (en) * | 2019-08-08 | 2019-10-22 | 中国地质大学（北京） | A kind of nano-sized magnesium hydroxide slurry and its preparation method and application |
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2020
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Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06115930A (en) * | 1992-10-05 | 1994-04-26 | Rohm & Haas Co | Preparation of stable magnesium hydroxide slurry |
| JPH06191832A (en) * | 1992-12-22 | 1994-07-12 | Nasu Tooa Kk | Preparation of activated magnesium hydroxide |
| JPH0881216A (en) * | 1994-09-09 | 1996-03-26 | Daicel Amiboshi Sangyo Kk | Water suspension of magnesium hydroxide and its production |
| CN1174171A (en) * | 1996-08-12 | 1998-02-25 | 大赛璐网干产业株式会社 | Magnesium hydroxide and method of preparing water suspension |
| KR20030054393A (en) * | 2001-12-24 | 2003-07-02 | 주식회사 포스코 | Slurry comprising magnesium hydroxide produced from seawater with high concentration |
| CN102120126A (en) * | 2011-02-17 | 2011-07-13 | 大连海事大学 | Preparation method of Mg(OH)2 slurry in marine desulfurization system by virtue of magnesium base-seawater method |
| US20160207788A1 (en) * | 2013-04-08 | 2016-07-21 | Tata Chemicals Limited | Redispersible magnesium hydroxide and a process for manufacturing the same |
| JP2014214083A (en) * | 2013-04-30 | 2014-11-17 | 東南貿易株式会社 | Brucite-derived magnesium hydroxide slurry production method |
| CN105565782A (en) * | 2015-12-15 | 2016-05-11 | 营口镁质材料研究院有限公司 | Preparation method of magnesium hydrate suspension slurry for magnesium oxide sintered body target material |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115337896A (en) * | 2022-07-22 | 2022-11-15 | 西南化工研究设计院有限公司 | Dry desulfurizing agent for ultralow emission of sulfonated tail gas and preparation method thereof |
| CN115337896B (en) * | 2022-07-22 | 2023-12-01 | 西南化工研究设计院有限公司 | Dry desulfurizing agent for ultralow emission of sulfonated tail gas and preparation method thereof |
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Application publication date: 20210507 |