CN115403281A - High-specific surface and high-activity calcium hydroxide and industrial preparation method thereof - Google Patents
High-specific surface and high-activity calcium hydroxide and industrial preparation method thereof Download PDFInfo
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- CN115403281A CN115403281A CN202211211082.5A CN202211211082A CN115403281A CN 115403281 A CN115403281 A CN 115403281A CN 202211211082 A CN202211211082 A CN 202211211082A CN 115403281 A CN115403281 A CN 115403281A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
- C04B2/045—After-treatment of slaked lime
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
- C04B2/06—Slaking with addition of substances, e.g. hydrophobic agents ; Slaking in the presence of other compounds
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01P2006/80—Compositional purity
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Abstract
The invention provides a high-specific surface and high-activity calcium hydroxide and an industrial preparation method thereof, quicklime is crushed to remove impurities to obtain quicklime powder, and an activator is mixed with industrial water to obtain water; adding quicklime powder into the three-stage dry digester through a quantitative belt feeder, adding water into the three-stage dry digester, fully expanding particles of the quicklime powder in the three-stage dry digester, rapidly gasifying moisture in the particles, further increasing the specific surface area of the particles, and reacting to obtain high-activity calcium hydroxide with a high specific surface; conveying the high-specific surface and high-activity calcium hydroxide dry powder into a grader through a sealed pipeline for separation to obtain high-purity high-specific surface and high-activity calcium hydroxide dry powder; the preparation process is simple, water treatment after digestion and aging and dehydration treatment of calcium hydroxide are not needed, the investment cost is reduced, automatic control can be realized in the production process, the operation safety performance is improved, no technical risk exists, and the preparation method can be widely applied to industrial production.
Description
Technical Field
The invention relates to the technical field of industrial calcium hydroxide preparation, in particular to high-specific surface and high-activity calcium hydroxide and an industrial preparation method thereof.
Background
The dry flue gas desulfurization technology is widely applied to the field of industrial flue gas pollutant control at present due to the advantages of simple operation, low maintenance and operation cost and the like. The sulfur dioxide in the flue gas is usually removed by spraying a calcium-based or sodium-based desulfurizing agent into the flue. The sodium-based desulfurizer is usually sodium bicarbonate, has the advantages of high reaction rate, high removal efficiency and the like, but has high cost, and simultaneously, the desulphurization byproduct is sodium sulfate, commonly called mirabilite, which is generally listed as solid waste, and individual areas are listed as dangerous waste, besides, the sodium-based desulfurizer needs to be used at the temperature of more than 140 ℃, thereby restricting the development of the sodium-based desulfurizer. Compared with a sodium-based desulfurizer, the calcium-based desulfurizer has lower cost and wide application temperature range, but has poorer desulfurization effect, so that the calcium-based desulfurizer with high activity and high specific surface is developed to replace the existing sodium-based desulfurizer, and has important market value and application prospect.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an industrial preparation method of high-specific surface and high-activity calcium hydroxide, which can prepare high-specific surface and high-activity calcium hydroxide dry powder with low cost and simple process.
The invention is realized by the following technical scheme:
an industrial preparation method of high-specific surface and high-activity calcium hydroxide comprises the following steps:
s1: crushing quicklime to remove impurities to obtain quicklime powder, mixing an active agent with industrial water to obtain a mixed solution, and using the mixed solution and the industrial water for water distribution of the three-stage dry digester;
s2: adding quicklime powder into the three-stage dry digester through a quantitative belt feeder, and simultaneously adding water into the three-stage dry digester to react to obtain high-activity calcium hydroxide with a high specific surface;
s3: and (3) conveying the high-specific surface and high-activity calcium hydroxide dry powder into a classifier through a sealed pipeline to remove large particles by separation, thus obtaining high-purity high-specific surface and high-activity calcium hydroxide dry powder.
Further, the water distribution process comprises the following steps:
fully mixing industrial water and an active agent in a mixing tank, and spraying the mixture into a digester through a three-stage dry digester spray head; or preparing a high-concentration mixed solution and adding the mixed solution into the digester, and then adding the industrial water into the digester.
Further, the active agent comprises one or a mixture of more of propylene glycol, glycerol, diethylene glycol, triethanolamine and isopropanol.
Further, the volume ratio of the active agent to the industrial water is 1: 5-1.
Further, the particle size of the quicklime powder is not more than 2mm.
Furthermore, the quantitative belt feeder adsorbs and removes iron in the quick lime powder in the process of transporting the quick lime powder.
Further, the mass ratio of the water to the quicklime powder in the step S2 is 1: 0.4-1: 0.6.
Further, the temperature of the first-stage digestion reaction of the third-stage dry digester in the step S2 is 105-230 ℃, the temperature of the second-stage digestion reaction is 75-105 ℃, and the temperature of the third-stage digestion reaction is 50-75 ℃; and in the step S2, the digestion reaction time of each stage of the three-stage dry digester is 15-20min.
Further, the rotation speed of each stage of the three-stage dry digester in the step S2 is as follows: the first stage is double-shaft rotation at the rotating speed of 10-15r/min; the second stage is double-shaft rotation at the rotating speed of 18-22r/min; the third stage is single-shaft rotation, and the rotating speed is 18-22r/min.
High-specific surface area and high-activity calcium hydroxide is 33.22m 2 More than g.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a high-specific surface and high-activity calcium hydroxide and an industrial preparation method thereof, quicklime is crushed to remove impurities to obtain quicklime powder, and an activator is mixed with industrial water to obtain water; adding quicklime powder into the three-stage dry digester through a quantitative belt feeder, and simultaneously adding water into the three-stage dry digester to react to obtain high-activity calcium hydroxide with a high specific surface; conveying the high-specific surface and high-activity calcium hydroxide dry powder into a grader through a sealed pipeline for separation to obtain high-purity high-specific surface and high-activity calcium hydroxide dry powder; the quick lime powder fully expands in tertiary dry-type digester granule, and the inside moisture of granule gasifies rapidly, and then can make its specific surface area further increase, and this application preparation technology is succinct, does not have the processing of water after the digestion and the ageing of calcium hydroxide, dehydration treatment, has reduced investment cost, and production process can realize automated control moreover, has improved the operational safety performance, and no technical risk can be applied to in a large number in industrial production.
Further, the water distribution process comprises the following steps: fully mixing industrial water and an active agent in a mixing tank, and spraying the mixture into a digester through a three-stage dry digester spray head; or preparing a high-concentration mixed solution in advance and adding the mixed solution into the digester, and then adding the industrial water into the digester; the dosage of the active agent can be adjusted at any time according to the industrial water consumption, the active agent is suitable for various adverse effects caused by the change of factors such as water-cement ratio, and the like, and the required calcium hydroxide dry powder with different specific surface areas can be obtained according to the adjustment of the factors, so that the applicability and the universality of the application are improved.
Drawings
FIG. 1 is a flow chart of an industrial preparation method of high-specific surface and high-activity calcium hydroxide;
FIG. 2 is a schematic view of the overall structure of the belt conveyor, the three-stage dry digester and the classifier;
FIG. 3 is a scanning electron micrograph of highly active calcium hydroxide with high specific surface area according to an embodiment of the present invention.
Wherein: the system comprises a lime feeding port 1, a magnet 2, a three-stage dry digester inlet 3, a mixing tank trunk 4, a water tank trunk 5, a three-stage dry digester outlet 6, a secondary air inlet 7, a classifier inlet 8, a classifier fine material outlet 9 and a classifier coarse material outlet 10.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in other sequences than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides an industrial preparation method of high-specific surface and high-activity calcium hydroxide, which comprises the following steps as shown in figure 1:
s1: crushing quicklime to remove impurities to obtain quicklime powder, mixing an active agent with industrial water to obtain a mixed solution, and using the mixed solution and the industrial water for water distribution of the three-stage dry digester;
s2: adding quicklime powder into the three-stage dry digester through a quantitative belt feeder, adding water into the three-stage dry digester, and reacting to obtain high-activity calcium hydroxide with a high specific surface;
s3: the high-specific surface and high-activity calcium hydroxide dry powder is sent into a classifier through a sealed pipeline to be sorted to obtain high-purity high-specific surface and high-activity calcium hydroxide dry powder, as shown in figure 3.
Preferably, the water distribution process comprises the following steps:
fully mixing industrial water and an active agent in a mixing tank, and spraying the mixture into a digester through a spray head of a three-stage dry digester; or preparing a high-concentration mixed solution in advance and adding the mixed solution into the digester, and then adding the industrial water into the digester.
Preferably, the active agent comprises one or a mixture of more of propylene glycol, glycerol, diethylene glycol, triethanolamine and isopropanol.
Preferably, the volume ratio of the active agent to the industrial water is 1: 5-1:20.
Preferably, the particle size of the quicklime powder is not more than 2mm.
Preferably, the quantitative belt feeder adsorbs and removes iron in the quicklime powder in the process of conveying the quicklime powder.
Preferably, the mass ratio of the water to the quicklime powder in the step S2 is 1: 0.4-1: 0.6.
Preferably, the temperature of the first-stage digestion reaction of the third-stage dry digester in the step S2 is 105-230 ℃, the temperature of the second-stage digestion reaction is 75-105 ℃, and the temperature of the third-stage digestion reaction is 50-75 ℃.
Preferably, the digestion reaction time of each stage of the three-stage dry digester in the step S2 is 15-20min.
Preferably, the rotation speed of each stage of the three-stage dry digester in the step S2 is one-stage double-shaft rotation, and the rotation speed is 10-15r/min; the second stage is double-shaft rotation at the rotating speed of 18-22r/min; the third stage is single-shaft rotation, and the rotating speed is 18-22r/min.
The application provides equipment for the industrial preparation of high-specific surface and high-activity calcium hydroxide, which comprises a quantitative belt feeder, a three-stage dry digester and a classifier, wherein the quantitative belt feeder is arranged on the top of the equipment as shown in figure 2;
a quicklime feeding hole 1 is formed in the upper end of the feeding end of the quantitative belt feeder, a discharging end of the quantitative belt feeder is connected to an inlet 3 of the three-stage dry digester, and a magnet 2 is arranged on the upper side of the quantitative belt feeder, close to one side of the inlet 3 of the three-stage dry digester;
the top of the third-stage dry digester is also connected with a mixing tank trunk 4 and a water tank trunk 5, the bottom of the third-stage dry digester is provided with a third-stage dry digester outlet 6, and the third-stage dry digester outlet 6 is connected with a classifier;
the top of the classifier is provided with a fine material outlet 9 of the classifier, the bottom of the classifier is provided with a coarse material outlet 10 of the classifier, the classifier comprises a main classification bin, the top of the main classification bin is provided with a classifier inlet 8, and the bottom of the main classification bin is provided with a secondary air inlet 7.
Preferably, the three-stage dry digester comprises a first-stage digestion, a second-stage digestion and a third-stage digestion, wherein the first-stage digestion and the second-stage digestion are in a structure form of double-shaft stirring, and the third-stage digestion is in a single-shaft stirring form. The double-shaft stirring blades in the first-stage digestion can promote the quicklime powder and the water to be fully mixed so as to accelerate the chemical reaction process between the quicklime powder and the water and convey the quicklime powder to the second-stage digestion; the double-shaft stirring blades in the second-stage digestion promote the quicklime powder to be continuously mixed with the water distribution, continuously react and push the quicklime powder to the third-stage digestion; and a single-shaft stirring blade in the third-stage digestion continuously stirs the materials, so that the materials are fully digested into calcium hydroxide dry powder meeting the requirements. The reaction temperature of each stage of the three-stage dry digester fluctuates within a certain temperature range due to the influence of the mixing and stirring condition, the reaction self condition and the stirring blade conveying.
Preferably, two water distribution main paths are arranged above the three-stage dry digester, one water distribution main path is connected with the mixing tank, the other water distribution main path is connected with the water tank, the two main paths are provided with electric valves and flow control devices, the three-stage dry digester is provided with six water distribution ports, and water distribution is carried out through branch nozzles.
The invention provides high-specific surface and high-activity calcium hydroxide, as shown in figure 3, the specific surface area of the high-specific surface and high-activity calcium hydroxide is 33.22m 2 More than g.
Comparative example 1:
(1) Crushing and removing impurities: crushing quicklime to remove impurities, and feeding the obtained quicklime powder with the particle size of not more than 2mm to a three-stage dry digester by a quantitative belt feeder at the dosage of 8.52 t/h;
(2) Water distribution: and opening a valve of the water tank to ensure that the industrial water in the water tank is sprayed into the three-stage dry digester at the dosage of 4.26 t/h.
(3) Digestion: mixing quicklime and industrial water by double-shaft stirring at a rotating speed of 15r/min in first-stage digestion to react, wherein the digestion temperature reaches about 106.2-237.8 ℃, then carrying out double-shaft stirring at a rotating speed of 22r/min in second-stage digestion to carry out digestion reaction, wherein the digestion temperature reaches about 84.7-105.8 ℃, and finally carrying out single-shaft stirring at a rotating speed of 22r/min in third-stage digestion to carry out digestion reaction, wherein the digestion temperature reaches about 58.2-83.1 ℃, and the digestion reaction time of each stage is about 15-20 min;
(4) Winnowing: the dry calcium hydroxide powder at the outlet of the three-stage dry digester is sent into a classifier through a closed pipeline for sorting to obtain the calcium hydroxide powder with the specific surface area of 7.36m 2 Per gram of finished calcium hydroxide dry powder.
Example 1
(1) Crushing and impurity removal: crushing quicklime to remove impurities, and feeding the obtained quicklime powder with the particle size of not more than 2mm to a three-stage dry digester through a quantitative belt feeder at the dosage of 7.95 t/h;
(2) Water distribution: adding industrial water in an amount of 2.83t/h and triethanolamine in an amount of 0.35t/h into a mixing tank, fully mixing and stirring, and then opening a valve to spray digestion mixed liquid into the three-stage dry digester in an amount of 3.18 t/h.
(3) Digestion: mixing quicklime and the digestion mixed liquor in a first-stage digestion at a rotating speed of 15r/min by double-shaft stirring for carrying out a mixing reaction, wherein the digestion temperature reaches about 105-233.4 ℃, then carrying out a digestion reaction in a second-stage digestion at a rotating speed of 22r/min by double-shaft stirring, the digestion temperature reaches about 75.8-104.8 ℃, and finally carrying out a digestion reaction in a third-stage digestion at a rotating speed of 22r/min by single-shaft stirring, wherein the digestion temperature reaches about 50.6-75.5 ℃, and the digestion reaction time of each stage is about 15-20 min;
(4) Winnowing: the dry calcium hydroxide powder at the outlet of the three-stage dry digester is sent into a classifier through a closed pipeline for sorting to obtain the calcium hydroxide powder with the specific surface area of 33.25m 2 The finished product of the calcium hydroxide dry powder with high specific surface area and high activity is/g.
Example 2
(1) Crushing and removing impurities: crushing quicklime to remove impurities, and feeding the obtained quicklime powder with the particle size of not more than 2mm to a three-stage dry digester through a quantitative belt feeder at the dosage of 8.09 t/h;
(2) Water distribution: 3.60t/h of industrial water and 0.45t/h of triethanolamine are added into a mixing tank for fully mixing and stirring, and then a valve is opened to spray digestion mixed liquor into the three-stage dry digester at 4.05 t/h.
(3) Digestion: the quick lime and the digestion mixed liquor are stirred in a double-shaft mode at a rotating speed of 15r/min for carrying out mixing reaction in a first-stage digestion process, the digestion temperature reaches about 106-235.4 ℃, then the digestion reaction is carried out in a second-stage digestion process, the digestion temperature reaches about 75.5-105.8 ℃, finally the digestion reaction is carried out in a single-shaft stirring mode at a rotating speed of 22r/min in a third-stage digestion process, the digestion temperature reaches about 50.8-75.1 ℃, and the digestion reaction time of each stage is about 15-20 min;
(4) Winnowing: the dry calcium hydroxide powder at the outlet of the three-stage dry digester is sent into a classifier through a closed pipeline for sorting to obtain the calcium hydroxide powder with the specific surface area of 40.34m 2 The finished product of the calcium hydroxide dry powder with high specific surface area and high activity is/g.
Example 3
(1) Crushing and impurity removal: crushing quicklime to remove impurities, and feeding the obtained quicklime powder with the particle size of not more than 2mm to a three-stage dry digester through a quantitative belt feeder at the dosage of 8.32 t/h;
(2) Water distribution: adding industrial water in an amount of 4.44t/h and triethanolamine in an amount of 0.55t/h into a mixing tank for fully mixing and stirring, and then opening a valve to spray digestion mixed liquor into the three-stage dry digester in an amount of 4.99 t/h.
(3) Digestion: the quick lime and the digestion mixed liquor are stirred in a double-shaft mode at a rotating speed of 15r/min for carrying out mixing reaction in a first-stage digestion process, the digestion temperature reaches about 105.7-234.4 ℃, then in a second-stage digestion process, the digestion temperature is stirred in a double-shaft mode at a rotating speed of 22r/min for carrying out digestion reaction, the digestion temperature reaches about 75.3-104.8 ℃, finally in a third-stage digestion process, the single-shaft stirring is carried out at a rotating speed of 22r/min for carrying out digestion reaction, the digestion temperature reaches about 50.5-74.5 ℃, and the digestion reaction time of each stage is about 15-20 min;
(4) Winnowing: delivering the calcium hydroxide dry powder at the outlet of the three-stage dry digester into a grader through a closed pipeline for sorting to obtain the calcium hydroxide dry powder with the specific surface area of 41.56m 2 The finished product of the calcium hydroxide dry powder with high specific surface area and high activity is/g.
Example 4
(1) Crushing and removing impurities: crushing quicklime to remove impurities, and feeding the obtained quicklime powder with the particle size of not more than 2mm to a three-stage dry digester through a quantitative belt feeder at the dosage of 8.15 t/h;
(2) Water distribution: adding 0.6t/h of industrial water and 0.45t/h of triethanolamine into a mixing tank for fully mixing and stirring, closing a main valve of the mixing tank, opening a main valve of a water tank, spraying digestion mixed liquor into the three-stage dry digester at the amount of 1.05t/h, and spraying the industrial water into the three-stage dry digester through the water tank at the amount of 3.03 t/h.
(3) Digestion: mixing quicklime, the digestion mixed liquor and industrial water in a first-stage digestion at a rotating speed of 15r/min by double-shaft stirring for carrying out mixing reaction, wherein the digestion temperature reaches about 104.7-230.4 ℃, then carrying out digestion reaction in a second-stage digestion at a rotating speed of 22r/min by double-shaft stirring, the digestion temperature reaches about 74.7-104.1 ℃, and finally carrying out digestion reaction in a third-stage digestion at a rotating speed of 22r/min by single-shaft stirring, the digestion temperature reaches about 49.5-74.2 ℃, wherein the digestion reaction time of each stage is about 15-20 min;
(4) Winnowing: the dry calcium hydroxide powder at the outlet of the three-stage dry digester is sent into a classifier through a closed pipeline for sorting to obtain the calcium hydroxide powder with the specific surface area of 33.22m 2 The finished product of the calcium hydroxide dry powder with high specific surface area and high activity is/g.
Example 5
(1) Crushing and impurity removal: crushing quicklime to remove impurities, and feeding the obtained quicklime powder with the particle size of not more than 2mm to a three-stage dry digester through a quantitative belt feeder at the dosage of 8.25 t/h;
(2) Water distribution: 3.69t/h of industrial water and 0.23t/h of triethanolamine and 0.21t/h of propylene glycol are added into a mixing tank for fully mixing and stirring, and then a valve is opened to spray digestion mixed liquor into the three-stage dry digester at the dosage of 4.13 t/h.
(3) Digestion: mixing quicklime and the digestion mixed liquor in a first-stage digestion at a rotating speed of 15r/min by double-shaft stirring for carrying out a mixing reaction, wherein the digestion temperature reaches about 103-238.4 ℃, then carrying out a digestion reaction in a second-stage digestion at a rotating speed of 22r/min by double-shaft stirring, the digestion temperature reaches about 75.8-102.5 ℃, and finally carrying out a digestion reaction in a third-stage digestion at a rotating speed of 22r/min by single-shaft stirring, wherein the digestion temperature reaches about 50.4-75.1 ℃, and the digestion reaction time of each stage is about 15-20 min;
(4) Winnowing: the dry calcium hydroxide powder at the outlet of the three-stage dry digester is sent into a classifier through a closed pipeline for sorting to obtain the calcium hydroxide powder with the specific surface area of 35.52m 2 The finished product of the calcium hydroxide dry powder with high specific surface area and high activity is/g.
The application provides a dry desulfurization performance test of the calcium hydroxide dry powder obtained in example 3 by using a desulfurization reactor; simulating flue gas to be SO 2 、H 2 Mixture of O and air, in which SO 2 The concentration is 100-800mg/m 3 ，H 2 The O content is 20 percent, the rest is air component, and the flue gas flow is 25m 3 The flow rate is 1.8m/s, the reaction temperature is controlled to be 220 ℃, the calcium-sulfur ratio is 2, and the retention time is 6s; SO of inlet and outlet 2 The concentration is detected by a flue gas analyzer, and the detection result is shown in table 1;
the desulfurization efficiency was calculated according to the following formula:
in the formula: w is a group of SO2 in Denotes inlet SO 2 In mg/m 3 Represents; w SO2 out Indicating the SO at the outlet after desulfurization 2 In mg/m 3 Is shown as eta SO2 The desulfurization efficiency is improved.
TABLE 1 desulfurization data of different concentrations of high activity calcium hydroxide of finished product high specific surface
| Inlet SO 2 Concentration/(mg/m) 3 ) | 110 | 215 | 298 | 397 | 522 | 598 | 699 | 795 |
| Outlet SO 2 Concentration/(mg/m) 3 ) | 13 | 21 | 28 | 32 | 44 | 51 | 63 | 68 |
| Desulfurization rate/%) | 88 | 90 | 91 | 92 | 92 | 91 | 91 | 91 |
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; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill 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. An industrial preparation method of high-specific surface and high-activity calcium hydroxide is characterized by comprising the following steps:
s1: crushing quicklime to remove impurities to obtain quicklime powder, mixing an activating agent with industrial water to obtain a mixed solution, and using the mixed solution and the industrial water for water distribution of a three-stage dry digester;
s2: adding quicklime powder into the three-stage dry digester through a quantitative belt feeder, and simultaneously adding water into the three-stage dry digester to react to obtain high-activity calcium hydroxide with a high specific surface;
s3: and (3) conveying the high-specific surface and high-activity calcium hydroxide dry powder into a classifier through a sealed pipeline to remove large particles by separation, thus obtaining high-purity high-specific surface and high-activity calcium hydroxide dry powder.
2. The method for industrially preparing the high-specific-surface and high-activity calcium hydroxide according to claim 1, wherein the water distribution process comprises the following steps:
fully mixing industrial water and an active agent in a mixing tank, and spraying the mixture into a digester through a three-stage dry digester spray head; or preparing a high-concentration mixed solution and adding the mixed solution into the digester, and then adding the industrial water into the digester.
3. The method of claim 1, wherein the active agent comprises one or more of propylene glycol, glycerol, diethylene glycol, triethanolamine, and isopropanol.
4. The method for industrially preparing the high-surface-area and high-activity calcium hydroxide according to claim 1, wherein the volume ratio of the active agent to the industrial water is 1: 5-1.
5. The industrial preparation method of high-specific surface area and high-activity calcium hydroxide as claimed in claim 1, wherein the particle size of the quicklime powder is not more than 2mm.
6. The industrial preparation method of high-specific surface area and high-activity calcium hydroxide as claimed in claim 1, wherein the quantitative belt feeder adsorbs and removes iron in the quicklime powder in the process of transporting the quicklime powder.
7. The industrial preparation method of high-specific surface and high-activity calcium hydroxide according to claim 1, wherein the mass ratio of the water to the quicklime powder in the step S2 is 1: 0.4-1: 0.6.
8. The industrial preparation method of high-specific-surface and high-activity calcium hydroxide according to claim 1, wherein the temperature of the first-stage digestion reaction in the third-stage dry digester in the step S2 is 105-230 ℃, the temperature of the second-stage digestion reaction is 75-105 ℃, and the temperature of the third-stage digestion reaction is 50-75 ℃; and the digestion reaction time of each stage of the three-stage dry digester in the step S2 is 15-20min.
9. The industrial preparation method of high-specific-surface and high-activity calcium hydroxide according to claim 1, wherein the rotation speed of each stage of the three-stage dry digester in the step S2 is one-stage double-shaft rotation, and the rotation speed is 10-15r/min; the second stage is double-shaft rotation at the rotating speed of 18-22r/min; the third stage is single-shaft rotation, and the rotating speed is 18-22r/min.
10. The high-specific surface and high-activity calcium hydroxide is characterized by being prepared by the industrial preparation method of the high-specific surface and high-activity calcium hydroxide according to any one of claims 1 to 9, and the specific surface area of the high-specific surface and high-activity calcium hydroxide is 33.22m 2 More than g.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211211082.5A CN115403281A (en) | 2022-09-30 | 2022-09-30 | High-specific surface and high-activity calcium hydroxide and industrial preparation method thereof |
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| CN117800622A (en) * | 2024-03-01 | 2024-04-02 | 山东宇信纳米科技有限公司 | High specific surface area calcium hydroxide production process and equipment |
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|---|---|---|---|---|
| WO2013001107A1 (en) * | 2011-06-28 | 2013-01-03 | Cybel Holding S.A. | Methods and systems for absorbing co2 and converting same into gaseous oxygen by means of microorganisms |
| CN110078389A (en) * | 2019-06-17 | 2019-08-02 | 邓金营 | A kind of high response and high-specific surface area calcium hydroxide raw powder's production technology |
| CN114804662A (en) * | 2022-05-12 | 2022-07-29 | 宁波环洋新材料股份有限公司 | Production method of calcium hydroxide with high specific surface area |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013001107A1 (en) * | 2011-06-28 | 2013-01-03 | Cybel Holding S.A. | Methods and systems for absorbing co2 and converting same into gaseous oxygen by means of microorganisms |
| CN110078389A (en) * | 2019-06-17 | 2019-08-02 | 邓金营 | A kind of high response and high-specific surface area calcium hydroxide raw powder's production technology |
| CN114804662A (en) * | 2022-05-12 | 2022-07-29 | 宁波环洋新材料股份有限公司 | Production method of calcium hydroxide with high specific surface area |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117800622A (en) * | 2024-03-01 | 2024-04-02 | 山东宇信纳米科技有限公司 | High specific surface area calcium hydroxide production process and equipment |
| CN117800622B (en) * | 2024-03-01 | 2024-06-11 | 山东宇信纳米科技有限公司 | High specific surface area calcium hydroxide production process and equipment |
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