CN110668712A - Method for improving quality of calcium hydroxide - Google Patents
Method for improving quality of calcium hydroxide Download PDFInfo
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- CN110668712A CN110668712A CN201911051819.XA CN201911051819A CN110668712A CN 110668712 A CN110668712 A CN 110668712A CN 201911051819 A CN201911051819 A CN 201911051819A CN 110668712 A CN110668712 A CN 110668712A
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- calcium hydroxide
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- quicklime
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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
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/02—Oxides or hydroxides
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- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
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- Inorganic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to the production field of calcium hydroxide, and particularly discloses a method for improving the quality of calcium hydroxide, wherein high-quality calcium hydroxide is prepared by primary, secondary and tertiary greying, and finally standing, cooling, dehydrating and drying; according to the invention, the quicklime and the hot water are directly reacted, so that the reaction temperature is continuously kept above 85 ℃, calcium hydroxide generated by the quicklime and the water is reduced, the calcium hydroxide is dissolved in the water, the whole reaction process is divided into three stages of reaction, and the quicklime and the water are completely reacted; meanwhile, a large amount of heat generated by the first-level greying, the second-level greying and the third-level greying is utilized to heat water required by the reaction, so that the energy consumption is reduced.
Description
Technical Field
The invention relates to the field of calcium hydroxide production, in particular to a method for improving the quality of calcium hydroxide.
Background
Calcium hydroxide is a white powdery solid. Chemical formula Ca (OH)2Commonly known as slaked lime and slaked lime, and the aqueous solution is known as clear limewater. Calcium hydroxide has the general property of being a strong base. Calcium hydroxide is a strong binary base, but only slightly soluble in water. Calcium hydroxide has wide application in industry. Calcium hydroxide is generally alkaline, a strong base, and since calcium hydroxide is much less soluble than calcium hydroxide, the caustic and alkaline nature of the calcium hydroxide solution is less corrosive than calcium hydroxide. These properties determine the wide range of applications for calcium hydroxide. It is used in agriculture to reduce soil acidity and improve soil structure, and it is obviously impossible to use calcium hydroxide in such situations. PesticideThe Bordeaux mixture is prepared with lime milk and water solution of copper sulfate in certain proportion. It was named after its first use in poldolo city, france in 1885. The sky-blue viscous suspension pesticide for fruit trees and vegetables can eliminate diseases and insect pests through copper elements in the suspension pesticide. The characteristic that calcium hydroxide can react with copper sulfate is utilized, and the characteristic that calcium hydroxide is slightly soluble in water is utilized to make the liquid medicine become sticky, which is beneficial to the attachment of the liquid medicine on the branches and leaves of the plants. In addition, calcium hydroxide reacts with carbon dioxide in the air to generate calcium carbonate which is insoluble in water, and the liquid medicine is also favorable for being attached to the surface of the plant for a period of time and not washed away by rainwater.
The general industrial preparation method of calcium hydroxide comprises the following steps: the lime slaking process includes calcining lime stone into calcium oxide, slaking with water in the ratio of 1 (3-3.5) to produce calcium hydroxide liquid, purifying, separating to eliminate slag, centrifugal dewatering, drying at 300 deg.c and sieving to obtain calcium hydroxide product of 120 mesh size.
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: ca (oh)2: CaO + H2O ═ ca (oh)2, but since the solubility of calcium hydroxide decreases with increasing temperature, lime slurry is often made at high temperature, so that at higher temperatures less calcium hydroxide is dissolved into the water and more slaked lime is produced. Because the general production process generates calcium hydroxide through the open air, a large amount of heat released in the process is directly lost to the air, cold water and calcium oxide are generally adopted for reaction, when the water temperature is low, part of generated calcium hydroxide is dissolved in water, the total calcium hydroxide is lower than the theoretical generation amount, a large amount of heat energy is released in the reaction process, and the heat energy is more dissipated, so that the temperature in the reaction is uneven, and the purity of the generated calcium hydroxide is low.
Disclosure of Invention
The invention aims to provide a method which can utilize heat energy in the process of generating calcium hydroxide and can improve the quality of the calcium hydroxide.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method for improving the quality of calcium hydroxide comprises the following steps:
s1: heating reaction water: heating water required in the spraying device to a certain temperature, and keeping a constant temperature state;
s2: first-stage greying: putting quicklime in a reaction device, uniformly spraying hot water in a spraying device on the quicklime in the reaction device through a spraying head, and reacting the hot water with the quicklime for a period of time;
s3: secondary graying: hot water in the spraying device is uniformly sprayed on the quick lime in the reaction device through a spray head, hot water is supplemented, the quick lime is subjected to secondary reaction, and the hot water and the quick lime react for a period of time;
s4: three-level greying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, so that the quicklime is reacted for three times, the hot water is reacted with the quicklime for a period of time, and the temperature in the reaction device is kept to be higher than 85 ℃ in the process; to prepare crude calcium hydroxide;
s5: cooling and standing: cooling the crude calcium hydroxide obtained after the reaction is completed, and precipitating the crude calcium hydroxide on a lower layer;
s6: and (3) dewatering and separating: filtering excessive water from the cooled lime slurry to leave crude calcium hydroxide;
s7: and (3) drying: heating the crude calcium hydroxide to remove redundant water and obtain the calcium hydroxide with higher purity.
As a preferred embodiment, the quicklime is prepared by calcining limestone with the mass fraction of more than 90%.
As a preferred embodiment, the water required in the spraying device in the step S1 is heated to 85-100 ℃.
In a preferred embodiment, in step S2, the reaction time of the first-stage graying is 1.5-2 h.
In a preferred embodiment, in step S3, the reaction time of the secondary graying is 2-2.5 h.
In a preferred embodiment, in step S4, the reaction time of the tertiary greying is 3-4 h.
As a preferred embodiment, a heat energy recovery device is arranged at the upper end of the reaction device, and the heat energy recovery device is connected with the spraying device.
By adopting the technical scheme, the water required by the reaction is heated to 85-100 ℃ in the initial stage of the reaction, the hot water directly reacts with the quicklime, the reaction temperature is continuously kept above 85 ℃, the calcium hydroxide generated by the quicklime and the water is reduced, the calcium hydroxide is dissolved in the water, the whole reaction process is divided into three stages of reaction, and the quicklime and the water are completely reacted; meanwhile, a large amount of heat generated by the first-level greying, the second-level greying and the third-level greying is utilized to heat water required by the reaction, so that the energy consumption is reduced.
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 only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a process flow diagram of the method of the present invention for improving the quality of calcium hydroxide;
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example one
A method for improving the quality of calcium hydroxide comprises the following steps:
s1: heating reaction water: heating water required in the spraying device to 85-100 ℃, and keeping a constant temperature state;
s2: first-stage greying: putting quicklime prepared by calcining limestone with the mass fraction of more than 90% in a reaction device, uniformly spraying hot water in a spraying device on the quicklime in the reaction device through a spraying head, and reacting the hot water with the quicklime for 1.6 h; the released heat is collected by a heat energy recovery device to heat water in the spraying device;
s3: secondary graying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, hot water is supplemented, the quicklime is subjected to secondary reaction, and the hot water and the quicklime react for 2 hours; the released heat is collected by a heat energy recovery device to heat water in the spraying device;
s4: three-level greying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, so that the quicklime is reacted for three times, the hot water is reacted with the quicklime for 3.2 hours, and the temperature in the reaction device is kept to be higher than 85 ℃ in the process; to prepare crude calcium hydroxide;
s5: cooling and standing: cooling the crude calcium hydroxide obtained after the reaction is completed, and precipitating the crude calcium hydroxide on a lower layer;
s6: and (3) dewatering and separating: filtering excessive water from the cooled lime slurry to leave crude calcium hydroxide;
s7: and (3) drying: heating the crude calcium hydroxide to remove redundant water and obtain the calcium hydroxide with higher purity.
Example two
A method for improving the quality of calcium hydroxide comprises the following steps:
s1: heating reaction water: heating water required in the spraying device to 85-100 ℃, and keeping a constant temperature state;
s2: first-stage greying: putting quicklime prepared by calcining limestone with the mass fraction of more than 90% in a reaction device, uniformly spraying hot water in a spraying device on the quicklime in the reaction device through a spraying head, and reacting the hot water with the quicklime for 1.5 h; the released heat is collected by a heat energy recovery device to heat water in the spraying device;
s3: secondary graying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, hot water is supplemented, the quicklime is subjected to secondary reaction, and the hot water and the quicklime react for 2.3 hours; the released heat is collected by a heat energy recovery device to heat water in the spraying device;
s4: three-level greying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, so that the quicklime is reacted for three times, the hot water is reacted with the quicklime for 3.4 hours, and the temperature in the reaction device is kept to be higher than 85 ℃ in the process; obtaining crude calcium hydroxide;
s5: cooling and standing: cooling the crude calcium hydroxide obtained after the reaction is completed, and precipitating the crude calcium hydroxide on a lower layer;
s6: and (3) dewatering and separating: filtering excessive water from the cooled lime slurry to leave crude calcium hydroxide;
s7: and (3) drying: heating the crude calcium hydroxide to remove redundant water and obtain the calcium hydroxide with higher purity.
EXAMPLE III
A method for improving the quality of calcium hydroxide comprises the following steps:
s1: heating reaction water: heating water required in the spraying device to 85-100 ℃, and keeping a constant temperature state;
s2: first-stage greying: putting quicklime prepared by calcining limestone with the mass fraction of more than 90% in a reaction device, uniformly spraying hot water in a spraying device on the quicklime in the reaction device through a spraying head, and reacting the hot water with the quicklime for 1.8 h; the released heat is collected by a heat energy recovery device to heat water in the spraying device;
s3: secondary graying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, hot water is supplemented, the quicklime is subjected to secondary reaction, and the hot water and the quicklime react for 2.4 hours; the released heat is collected by a heat energy recovery device to heat water in the spraying device;
s4: three-level greying: uniformly spraying hot water in the spraying device on the quicklime in the reaction device through a spray head, so that the quicklime is reacted for three times, reacting the hot water with the quicklime for 3.6 hours, and keeping the temperature in the reaction device to be higher than 85 ℃ in the process; to prepare crude calcium hydroxide;
s5: cooling and standing: cooling the crude calcium hydroxide obtained after the reaction is completed, and precipitating the crude calcium hydroxide on a lower layer;
s6: and (3) dewatering and separating: filtering excessive water from the cooled lime slurry to leave crude calcium hydroxide;
s7: and (3) drying: heating the crude calcium hydroxide to remove redundant water and obtain the calcium hydroxide with higher purity.
Example four
A method for improving the quality of calcium hydroxide comprises the following steps:
s1: heating reaction water: heating water required in the spraying device to 85-100 ℃, and keeping a constant temperature state;
s2: first-stage greying: putting quicklime prepared by calcining limestone with the mass fraction of more than 90% in a reaction device, uniformly spraying hot water in a spraying device on the quicklime in the reaction device through a spraying head, and reacting the hot water with the quicklime for 1.7 h; the released heat is collected by a heat energy recovery device to heat water in the spraying device;
s3: secondary graying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, hot water is supplemented, the quicklime is subjected to secondary reaction, and the hot water and the quicklime react for 2.2 hours; the released heat is collected by a heat energy recovery device to heat water in the spraying device;
s4: three-level greying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, so that the quicklime is reacted for three times, the hot water is reacted with the quicklime for 4 hours, and the temperature in the reaction device is kept to be higher than 85 ℃ in the process; to prepare crude calcium hydroxide;
s5: cooling and standing: cooling the crude calcium hydroxide obtained after the reaction is completed, and precipitating the crude calcium hydroxide on a lower layer;
s6: and (3) dewatering and separating: filtering excessive water from the cooled lime slurry to leave crude calcium hydroxide;
s7: and (3) drying: heating the crude calcium hydroxide to remove redundant water and obtain the calcium hydroxide with higher purity.
EXAMPLE five
A method for improving the quality of calcium hydroxide comprises the following steps:
s1: heating reaction water: heating water required in the spraying device to 85-100 ℃, and keeping a constant temperature state;
s2: first-stage greying: putting quicklime prepared by calcining limestone with the mass fraction of more than 90% in a reaction device, uniformly spraying hot water in a spraying device on the quicklime in the reaction device through a spraying head, and reacting the hot water with the quicklime for 2 hours; the released heat is collected by a heat energy recovery device to heat water in the spraying device;
s3: secondary graying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, hot water is supplemented, the quicklime is subjected to secondary reaction, and the hot water and the quicklime react for 2.5 hours; the released heat is collected by a heat energy recovery device to heat water in the spraying device;
s4: three-level greying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, so that the quicklime is reacted for three times, the hot water is reacted with the quicklime for 3.8 hours, and the temperature in the reaction device is kept to be higher than 85 ℃ in the process; to prepare crude calcium hydroxide;
s5: cooling and standing: cooling the crude calcium hydroxide obtained after the reaction is completed, and precipitating the crude calcium hydroxide on a lower layer;
s6: and (3) dewatering and separating: filtering excessive water from the cooled lime slurry to leave crude calcium hydroxide;
s7: and (3) drying: heating the crude calcium hydroxide to remove redundant water and obtain the calcium hydroxide with higher purity.
The purity of the calcium hydroxide prepared in the first to fifth examples was measured, and the results were as follows:
| item | Example one | Example two | EXAMPLE III | Example four | EXAMPLE five | Blank control |
| Amount of impurities | 2.6％ | 3.8％ | 2.9％ | 3.4％ | 3.27％ | 10.3％ |
| Purity of | 96.4％ | 96.2％ | 97.1％ | 96.6％ | 96.73％ | 89.7％ |
| Yield of the product | 92％ | 93.1％ | 93.32％ | 91.67％ | 93.25％ | 80.78％ |
Calcium hydroxide manufactured by adopting a general process on the market is selected for comparison with the first embodiment to the fifth embodiment of the invention, and the following results can be obtained through a detection table:
the purity of the calcium hydroxide prepared in the first to fifth embodiments of the invention is higher than that of the calcium hydroxide prepared by the general process. In the production process, the heat energy released by the reaction is recycled, so that the energy consumption is reduced; meanwhile, a certain temperature is maintained, so that the reaction temperature is continuously kept above 85 ℃, calcium hydroxide generated by quicklime and water is reduced, the calcium hydroxide is dissolved in water, and the yield and the purity of the calcium hydroxide are improved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (7)
1. A method for improving the quality of calcium hydroxide is characterized by comprising the following steps: the method comprises the following steps:
s1: heating reaction water: heating water required in the spraying device to a certain temperature, and keeping a constant temperature state;
s2: first-stage greying: putting quicklime in a reaction device, uniformly spraying hot water in a spraying device on the quicklime in the reaction device through a spraying head, and reacting the hot water with the quicklime for a period of time;
s3: secondary graying: hot water in the spraying device is uniformly sprayed on the quick lime in the reaction device through a spray head, hot water is supplemented, the quick lime is subjected to secondary reaction, and the hot water and the quick lime react for a period of time;
s4: three-level greying: hot water in the spraying device is uniformly sprayed on the quicklime in the reaction device through a spray head, so that the quicklime is reacted for three times, the hot water is reacted with the quicklime for a period of time, and the temperature in the reaction device is kept to be higher than 85 ℃ in the process; to prepare crude calcium hydroxide;
s5: cooling and standing: cooling the crude calcium hydroxide obtained after the reaction is completed, and precipitating the crude calcium hydroxide on a lower layer;
s6: and (3) dewatering and separating: filtering excessive water from the cooled lime slurry to leave crude calcium hydroxide;
s7: and (3) drying: heating the crude calcium hydroxide to remove redundant water and obtain the calcium hydroxide with higher purity.
2. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the quick lime is prepared by calcining limestone with the mass fraction of more than 90%.
3. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the water required in the spraying device in the step S1 is heated to 85-100 ℃.
4. The method for improving the quality of calcium hydroxide according to claim 1, wherein: in the step S2, the reaction time of the first-level graying is 1.5-2 h.
5. The method for improving the quality of calcium hydroxide according to claim 1, wherein: in the step S3, the reaction time of the secondary graying is 2-2.5 h.
6. The method for improving the quality of calcium hydroxide according to claim 1, wherein: in the step S4, the reaction time of the three-level greying is 3-4 h.
7. The method for improving the quality of calcium hydroxide according to claim 1, wherein: the upper end of the reaction device is provided with a heat energy recovery device, and the heat energy recovery device is connected with the spraying device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114644463A (en) * | 2020-12-18 | 2022-06-21 | 衢州顺天钙业有限公司 | Method for improving quality of calcium hydroxide |
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| CN109336420A (en) * | 2018-12-13 | 2019-02-15 | 四川和临科技发展有限公司 | A kind of production method of calcium hydroxide |
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| DE102012020192A1 (en) * | 2011-11-19 | 2013-05-23 | Ewa Piaszczynski | Producing lime, which is processable into products e.g. for paint industry and products of restoration industry, comprises preparing mixture of water, ethanol and long-chain cellulose ether, and allowing mixture to act on calcium hydroxide |
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Application publication date: 20200110 |