CN114644463A - Method for improving quality of calcium hydroxide - Google Patents
Method for improving quality of calcium hydroxide Download PDFInfo
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- CN114644463A CN114644463A CN202011502948.9A CN202011502948A CN114644463A CN 114644463 A CN114644463 A CN 114644463A CN 202011502948 A CN202011502948 A CN 202011502948A CN 114644463 A CN114644463 A CN 114644463A
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- calcium hydroxide
- filter residue
- temperature
- reaction product
- lime slaker
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- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 title claims abstract description 111
- 239000000920 calcium hydroxide Substances 0.000 title claims abstract description 109
- 229910001861 calcium hydroxide Inorganic materials 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 31
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 104
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 87
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 72
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 72
- 239000004571 lime Substances 0.000 claims abstract description 72
- 239000000292 calcium oxide Substances 0.000 claims abstract description 55
- 238000010438 heat treatment Methods 0.000 claims abstract description 42
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 235000012255 calcium oxide Nutrition 0.000 claims description 54
- 239000007795 chemical reaction product Substances 0.000 claims description 54
- 230000029087 digestion Effects 0.000 claims description 53
- 239000000843 powder Substances 0.000 claims description 36
- 238000001914 filtration Methods 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 15
- 235000019738 Limestone Nutrition 0.000 claims description 14
- 239000006028 limestone Substances 0.000 claims description 14
- 238000001354 calcination Methods 0.000 claims description 12
- 230000035484 reaction time Effects 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- 238000010298 pulverizing process Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 22
- 238000002360 preparation method Methods 0.000 abstract description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 6
- 238000001556 precipitation Methods 0.000 abstract description 4
- 235000011116 calcium hydroxide Nutrition 0.000 description 81
- 239000007788 liquid Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000844 anti-bacterial effect Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000013064 chemical raw material Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- C04B2/08—Devices therefor
-
- 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
- C04B2/10—Preheating, burning calcining or cooling
Abstract
The invention discloses a method for improving the quality of calcium hydroxide, which belongs to the technical field of calcium hydroxide preparation and comprises nine steps. According to the invention, the temperature sensor is used for monitoring the interior of the lime slaker, when the temperature of the interior of the lime slaker is lower than a preset value, the lime slaker is heated by the heating device, and meanwhile, the reaction water is heated, so that the temperature in the calcium oxide slaking process can be increased, the problem that the traditional calcium hydroxide preparation process is generally in a naked outdoor environment, the outdoor environment temperature is low, the temperature in the preparation process is easy to reduce, and further the calcium hydroxide preparation yield is reduced, and meanwhile, the reaction temperature is uneven due to the condition that heat can be generated in the reaction process, and further the purity of a calcium hydroxide finished product is reduced is solved, so that the reaction temperature is effectively increased, the precipitation amount of calcium hydroxide is increased, the yield is increased, and the purity of the calcium hydroxide is increased.
Description
Technical Field
The invention relates to the technical field of calcium hydroxide preparation, in particular to a method for improving the quality of calcium hydroxide.
Background
Calcium hydroxide is an inorganic compound of the formula Ca (OH)2Commonly known as slaked lime or slaked lime. Is a white powdery solid, and is divided into an upper layer and a lower layer after water is added, wherein the upper layer aqueous solution is called as clear lime water, and the lower layer suspension is called as lime milk or lime slurry. The supernatant clear lime water can be used for detecting carbon dioxide, and the lower turbid liquid lime milk is a building material. Calcium hydroxide is a strong base with bactericidal and preventive effectsRot ability, and has corrosive effect on skin and fabric. Calcium hydroxide has wide application in industry. It is a common building material and also used as a bactericide, a chemical raw material and the like.
The general industrial preparation method of calcium hydroxide comprises the following steps: lime slaking: after the limestone is calcined into calcium oxide, the limestone is selected and digested with water in proportion to generate calcium hydroxide feed liquid, and the calcium hydroxide feed liquid is purified, separated and deslagged, centrifugally dewatered, dried and screened to obtain the finished product of calcium hydroxide. When calcium oxide contacts with water, a large amount of heat is generated, white smoke is emitted, and the main reaction equation is as follows: CaO + H2O ═ Ca (OH)2However, since the solubility of calcium hydroxide decreases with increasing temperature, lime slurry is often made at high temperature, so that less calcium hydroxide is dissolved into the water at higher temperatures and more slaked lime can be made.
The traditional calcium hydroxide preparation process is generally a naked outdoor environment, the outdoor environment temperature is lower, the temperature during preparation is easy to reduce, the yield of the calcium hydroxide is reduced, meanwhile, the reaction temperature is uneven due to the condition that heat can be generated in the reaction process, and the purity of a calcium hydroxide finished product is reduced.
Disclosure of Invention
The invention aims to provide a method for improving the quality of calcium hydroxide, which can monitor the interior of a lime slaker through a temperature sensor, heat the lime slaker through a heating device when the temperature in the lime slaker is lower than a preset value, and simultaneously heat reaction water, can improve the temperature in the process of calcium oxide digestion, further effectively improve the reaction temperature, increase the precipitation amount of calcium hydroxide, improve the yield, simultaneously enable the reaction in the lime slaker to be more uniform and sufficient, further improve the purity of calcium hydroxide, and solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for improving the quality of calcium hydroxide, comprising: the method comprises the following steps:
s1: crushing limestone with the mass fraction of more than 90%, adding the crushed limestone into a calcining furnace for calcining to prepare quicklime, and crushing the quicklime after vibrating the quicklime raw material to obtain quicklime powder;
s2: adding cold water into a boiler, and heating to obtain hot water;
s3: starting a heating device, heating the interior of the lime slaker, and monitoring the temperature of the interior of the lime slaker through a temperature sensor;
s4: adding quicklime powder into a lime slaker, then introducing heated water, starting the lime slaker, reacting hot water with quicklime to obtain a first slaking reaction product, and then filtering the first slaking reaction product to obtain crude calcium hydroxide and first filter residue;
s5: adding the first filter residue into a lime slaker, then introducing heated water, starting the lime slaker, reacting hot water with the first filter residue to obtain a second digestion reaction product, and then filtering the second digestion reaction product to obtain crude calcium hydroxide and second filter residue;
s6: adding the second filter residue into a lime slaker, then introducing heated water, starting the lime slaker, reacting hot water with the second filter residue to obtain a third digestion reaction product, and then filtering the third digestion reaction product to obtain crude calcium hydroxide and third filter residue;
s7: mixing the crude calcium hydroxide obtained in S3, S4 and S5, adding the mixture into drying equipment for heating and drying, and removing excessive water to obtain high-purity calcium hydroxide;
s8: adding high-purity calcium hydroxide into a pulverizer to perform pulverizing treatment to obtain fine powder calcium hydroxide;
s9: and conveying the fine powder calcium hydroxide to a calcium hydroxide bin for storage through a bucket elevator.
Preferably, the heating temperature in the S2 is 80-100 ℃.
Preferably, the heating temperature of the heating device in S3 is 85-95 ℃.
Preferably, the mass part ratio of the quicklime powder to the water in the S4 is 1:0.5-0.9, and the reaction time of the hot water and the quicklime is 1-2 h.
Preferably, the mass part ratio of the first filter residue to the water in the S5 is 1:1-1.5, and the reaction time of the hot water and the first filter residue is 1.8-2.5 h.
Preferably, the mass part ratio of the second filter residue to the water in the S6 is 1:1-1.3, and the reaction time of the hot water and the second filter residue is 1: 1-1.3.
Preferably, the temperature at which the first digestion reaction product is cooled, the temperature at which the second digestion reaction product is cooled, and the temperature at which the third digestion reaction product is cooled are all between 30 ℃ and 50 ℃.
Preferably, a heat energy recovery device communicated with the lime slaker is arranged outside the lime slaker.
Preferably, the drying temperature in S7 is 120-250 ℃.
Preferably, the particle size of the fine powder calcium hydroxide in S8 is 150-300 meshes.
Compared with the prior art, the invention has the beneficial effects that:
through temperature sensor, can monitor the inside of lime slaker, when lime slaker internal temperature is less than the default, heat the lime slaker through heating device, heat the water of reaction simultaneously, can improve the temperature of calcium oxide digestion in-process, and then effectual improvement reaction temperature, the precipitation amount of calcium hydroxide has been increased, increase of production, can make more even and abundant of lime slaker internal reaction simultaneously, and then the purity of calcium hydroxide has been improved.
Drawings
Fig. 1 is a flow chart of a method for improving the quality of calcium hydroxide according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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.
Referring to fig. 1, the present invention provides a technical solution:
example one
A method for increasing the quality of calcium hydroxide, comprising: the method comprises the following steps:
s1: crushing limestone with the mass fraction of more than 90%, adding the crushed limestone into a calcining furnace for calcining to prepare quicklime, and crushing the quicklime after vibrating the quicklime raw material to obtain quicklime powder;
s2: adding cold water into a boiler, and heating at 90 ℃ to obtain hot water;
s3: starting a heating device, heating the interior of the lime slaker, wherein the heating temperature of the heating device is 85 ℃, and monitoring the temperature of the interior of the lime slaker through a temperature sensor;
s4: adding quicklime powder into a lime slaker, then introducing heated water, wherein the mass part ratio of the quicklime powder to the water is 1:0.5, starting the lime slaker, reacting hot water with the quicklime, reacting the hot water with the quicklime for 1.5h, and obtaining a first digestion reaction product at the reaction temperature of 85 ℃, cooling the first digestion reaction product to 35 ℃, and then filtering the first digestion reaction product to obtain crude calcium hydroxide and first filter residue;
s5: adding the first filter residue into a lime slaker, then introducing heated water, wherein the mass part ratio of the first filter residue to the water is 1:1.2, starting the lime slaker, reacting hot water with the first filter residue for 1.9 hours at 59 ℃ to obtain a second digestion reaction product, cooling the second digestion reaction product to 45 ℃, and then filtering the second digestion reaction product to obtain crude calcium hydroxide and second filter residue;
s6: adding the second filter residue into a lime slaker, then introducing heated water, wherein the mass part ratio of the second filter residue to the water is 1:1.3, starting the lime slaker, reacting hot water with the second filter residue for 3.6 hours at 88 ℃ to obtain a third digestion reaction product, cooling the third digestion reaction product to 30 ℃, and then filtering the third digestion reaction product to obtain crude calcium hydroxide and third filter residue;
s7: mixing the crude calcium hydroxide obtained in S3, S4 and S5, adding the mixture into drying equipment, heating and drying at the drying temperature of 210 ℃, and removing excessive moisture to obtain high-purity calcium hydroxide;
s8: adding high-purity calcium hydroxide into a pulverizer to perform pulverizing treatment to obtain fine powder calcium hydroxide, wherein the particle size of the fine powder calcium hydroxide is 180 meshes;
s9: and conveying the fine powder calcium hydroxide to a calcium hydroxide bin for storage through a bucket elevator.
Example two
A method for improving the quality of calcium hydroxide, comprising: the method comprises the following steps:
s1: crushing limestone with the mass fraction of more than 90%, adding the crushed limestone into a calcining furnace for calcining to prepare quicklime, and crushing the quicklime after vibrating the quicklime raw material to obtain quicklime powder;
s2: adding cold water into a boiler, and heating at 98 ℃ to obtain hot water;
s3: starting a heating device, heating the interior of the lime slaker, wherein the heating temperature of the heating device is 95 ℃, and monitoring the temperature of the interior of the lime slaker through a temperature sensor;
s4: adding quicklime powder into a lime slaker, then introducing heated water, wherein the mass part ratio of the quicklime powder to the water is 1:0.8, starting the lime slaker, reacting hot water with the quicklime, the reaction time of the hot water with the quicklime is 1.5h, the reaction temperature is 85 ℃, obtaining a first digestion reaction product, cooling the first digestion reaction product to 40 ℃, and then filtering the first digestion reaction product to obtain crude calcium hydroxide and first filter residue;
s5: adding the first filter residue into a lime slaker, then introducing heated water, wherein the mass part ratio of the first filter residue to the water is 1:1.4, starting the lime slaker, reacting hot water with the first filter residue for 2.2 hours at 92 ℃ to obtain a second digestion reaction product, cooling the second digestion reaction product to 47 ℃, and then filtering the second digestion reaction product to obtain crude calcium hydroxide and second filter residue;
s6: adding the second filter residue into a lime slaker, then introducing heated water, wherein the mass part ratio of the second filter residue to the water is 1:1.1, starting the lime slaker, reacting hot water with the second filter residue for 3.4 hours at the reaction temperature of 91 ℃, obtaining a third digestion reaction product, cooling the third digestion reaction product to 48 ℃, and then filtering the third digestion reaction product to obtain crude calcium hydroxide and third filter residue;
s7: mixing the crude calcium hydroxide obtained in S3, S4 and S5, adding the mixture into drying equipment, heating and drying at 220 ℃, and removing excessive moisture to obtain high-purity calcium hydroxide;
s8: adding high-purity calcium hydroxide into a grinding mill to be ground to obtain fine powder calcium hydroxide, wherein the granularity of the fine powder calcium hydroxide is 200 meshes;
s9: and conveying the fine powder calcium hydroxide to a calcium hydroxide bin for storage through a bucket elevator.
EXAMPLE III
A method for improving the quality of calcium hydroxide, comprising: the method comprises the following steps:
s1: crushing limestone with the mass fraction of more than 90%, adding the crushed limestone into a calcining furnace for calcining to prepare quicklime, and crushing the quicklime after vibrating the quicklime raw material to obtain quicklime powder;
s2: adding cold water into a boiler, and heating at 97 ℃ to obtain hot water;
s3: starting a heating device, heating the interior of the lime slaker, wherein the heating temperature of the heating device is 92 ℃, and monitoring the temperature of the interior of the lime slaker through a temperature sensor;
s4: adding quicklime powder into a lime slaker, then introducing heated water, wherein the mass part ratio of the quicklime powder to the water is 1:0.8, starting the lime slaker, reacting hot water with the quicklime, the reaction time of the hot water and the quicklime is 1.8h, the reaction temperature is 91 ℃, obtaining a first digestion reaction product, cooling the first digestion reaction product to 48 ℃, and then filtering the first digestion reaction product to obtain crude calcium hydroxide and first filter residue;
s5: adding the first filter residue into a lime slaker, then introducing heated water, wherein the mass part ratio of the first filter residue to the water is 1:1.3, starting the lime slaker, reacting hot water with the first filter residue for 2.2 hours at 88 ℃ to obtain a second digestion reaction product, cooling the second digestion reaction product to 44 ℃, and then filtering the second digestion reaction product to obtain crude calcium hydroxide and second filter residue;
s6: adding the second filter residue into a lime slaker, then introducing heated water, wherein the mass part ratio of the second filter residue to the water is 1:1.1, starting the lime slaker, reacting hot water with the second filter residue, reacting the hot water with the second filter residue for 3.3, and at the reaction temperature of 87 ℃, so as to obtain a third digestion reaction product, cooling the third digestion reaction product to 39 ℃, and then filtering the third digestion reaction product to obtain crude calcium hydroxide and third filter residue;
s7: mixing the crude calcium hydroxide obtained in S3, S4 and S5, adding the mixture into drying equipment, heating and drying at the drying temperature of 210 ℃, and removing excessive moisture to obtain high-purity calcium hydroxide;
s8: adding high-purity calcium hydroxide into a pulverizer to perform pulverizing treatment to obtain fine powder calcium hydroxide, wherein the granularity of the fine powder calcium hydroxide is 220 meshes;
s9: and conveying the fine powder calcium hydroxide to a calcium hydroxide bin for storage through a bucket elevator.
Example four
A method for improving the quality of calcium hydroxide, comprising: the method comprises the following steps:
s1: crushing limestone with the mass fraction of more than 90%, adding the crushed limestone into a calcining furnace for calcining to prepare quicklime, and crushing the quicklime after vibrating the quicklime raw material to obtain quicklime powder;
s2: adding cold water into a boiler, and heating at 98 ℃ to obtain hot water;
s3: starting a heating device, heating the interior of the lime slaker, wherein the heating temperature of the heating device is 91 ℃, and monitoring the temperature of the interior of the lime slaker through a temperature sensor;
s4: adding quicklime powder into a lime slaker, then introducing heated water, wherein the mass part ratio of the quicklime powder to the water is 1:0.9, starting the lime slaker, reacting hot water with the quicklime, the reaction time of the hot water with the quicklime is 1.7h, the reaction temperature is 93 ℃, obtaining a first digestion reaction product, cooling the first digestion reaction product to 49 ℃, and then filtering the first digestion reaction product to obtain crude calcium hydroxide and first filter residue;
s5: adding the first filter residue into a lime slaker, then introducing heated water, wherein the mass part ratio of the first filter residue to the water is 1:1.2, starting the lime slaker, reacting hot water with the first filter residue for 2.1 hours at 90 ℃ to obtain a second digestion reaction product, cooling the second digestion reaction product to 47 ℃, and then filtering the second digestion reaction product to obtain crude calcium hydroxide and second filter residue;
s6: adding the second filter residue into a lime slaker, then introducing heated water, wherein the mass part ratio of the second filter residue to the water is 1:1.2, starting the lime slaker, reacting hot water with the second filter residue for 3.3 hours at 86 ℃ to obtain a third digestion reaction product, cooling the third digestion reaction product to 41 ℃, and then filtering the third digestion reaction product to obtain crude calcium hydroxide and third filter residue;
s7: mixing the crude calcium hydroxide obtained in S3, S4 and S5, adding the mixture into drying equipment, heating and drying at 220 ℃, and removing excessive moisture to obtain high-purity calcium hydroxide;
s8: adding high-purity calcium hydroxide into a pulverizer to be pulverized to obtain fine powder calcium hydroxide, wherein the granularity of the fine powder calcium hydroxide is 230 meshes;
s9: and conveying the fine powder calcium hydroxide to a calcium hydroxide bin for storage through a bucket elevator.
To sum up, through temperature sensor, can monitor the inside of lime slaker, when lime slaker internal temperature is less than the default, heat lime slaker through heating device, heat the reaction water simultaneously, can improve the temperature of calcium oxide digestion in-process, and then effectual improvement reaction temperature, increased the precipitation amount of calcium hydrate, increase of production, can make more even and abundant of lime slaker internal reaction simultaneously, and then improved the purity of calcium hydroxide.
The parts not involved in the present invention are the same as or can be implemented by the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A method for improving the quality of calcium hydroxide, which is characterized by comprising the following steps: the method comprises the following steps:
s1: crushing limestone with the mass fraction of more than 90%, adding the crushed limestone into a calcining furnace for calcining to prepare quicklime, and crushing the quicklime after vibrating the quicklime raw material to obtain quicklime powder;
s2: adding cold water into a boiler, and heating to obtain hot water;
s3: starting a heating device, heating the interior of the lime slaker, and monitoring the temperature of the interior of the lime slaker through a temperature sensor;
s4: adding quicklime powder into a lime slaker, then introducing heated water, starting the lime slaker, reacting hot water with quicklime to obtain a first slaking reaction product, and then filtering the first slaking reaction product to obtain crude calcium hydroxide and first filter residue;
s5: adding the first filter residue into a lime slaker, then introducing heated water, starting the lime slaker, reacting hot water with the first filter residue to obtain a second digestion reaction product, and then filtering the second digestion reaction product to obtain crude calcium hydroxide and second filter residue;
s6: adding the second filter residue into a lime slaker, then introducing heated water, starting the lime slaker, reacting hot water with the second filter residue to obtain a third digestion reaction product, and then filtering the third digestion reaction product to obtain crude calcium hydroxide and third filter residue;
s7: mixing the crude calcium hydroxide obtained in S3, S4 and S5, adding the mixture into drying equipment for heating and drying, and removing excessive water to obtain high-purity calcium hydroxide;
s8: adding high-purity calcium hydroxide into a pulverizer to perform pulverizing treatment to obtain fine powder calcium hydroxide;
s9: and conveying the fine powder calcium hydroxide to a calcium hydroxide bin for storage through a bucket elevator.
2. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the heating temperature in the S2 is 80-100 ℃.
3. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the heating temperature of the heating device in the S3 is 85-95 ℃.
4. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the mass portion ratio of the quicklime powder to the water in the S4 is 1:0.5-0.9, and the reaction time of the hot water and the quicklime is 1-2 h.
5. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the mass part ratio of the first filter residue to the water in the S5 is 1:1-1.5, and the reaction time of the hot water and the first filter residue is 1.8-2.5 h.
6. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the mass part ratio of the second filter residue to the water in the S6 is 1:1-1.3, and the reaction time of the hot water and the second filter residue is 1: 1-1.3.
7. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the temperature for cooling the first digestion reaction product, the temperature for cooling the second digestion reaction product and the temperature for cooling the third digestion reaction product are all 30-50 ℃.
8. The method for improving the quality of calcium hydroxide according to claim 1, wherein: and a heat energy recovery device communicated with the lime slaker is arranged on the outer side of the lime slaker.
9. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the drying temperature in the S7 is 120-250 ℃.
10. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the granularity of the fine powder calcium hydroxide in the S8 is 150-300 meshes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117142505A (en) * | 2023-09-15 | 2023-12-01 | 杭州宏鑫钙业有限公司 | Preparation method of calcium hydroxide |
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| CN117142505A (en) * | 2023-09-15 | 2023-12-01 | 杭州宏鑫钙业有限公司 | Preparation method of calcium hydroxide |
| CN117142505B (en) * | 2023-09-15 | 2024-03-12 | 杭州宏鑫钙业有限公司 | Preparation method of calcium hydroxide |
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