CN111517677A - Processing method of calcium hydroxide powder - Google Patents
Processing method of calcium hydroxide powder Download PDFInfo
- Publication number
- CN111517677A CN111517677A CN202010310295.8A CN202010310295A CN111517677A CN 111517677 A CN111517677 A CN 111517677A CN 202010310295 A CN202010310295 A CN 202010310295A CN 111517677 A CN111517677 A CN 111517677A
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- Prior art keywords
- digester
- digestion
- calcium hydroxide
- hydroxide powder
- water
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Classifications
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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
- C04B2/10—Preheating, burning calcining or cooling
-
- 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
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention relates to a processing method of calcium hydroxide powder, belonging to the field of calcium hydroxide powder processing. The method comprises the following steps: a. calcining and crushing a limestone raw material into quick lime; b. adding water, a dispersing additive and a surfactant into quicklime for primary digestion, wherein the water-material ratio for digestion is 0.65-0.8, the stirring speed of a digester is 700-750 rpm, the outlet temperature of the digester is 65-70 ℃, and the digestion time is 15 min; c. adding a dispersed hydrophobic moisture-proof additive for secondary digestion, wherein no water is added in the secondary digestion, the stirring speed of a digester is 750-800 rpm, the outlet temperature of the digester is 80-85 ℃, and the digestion time is 1 hour; d. calcium hydroxide powder is generated through dehydration, drying and crushing and is input into a storage bin for storage; the invention has high reaction activity, good fluidity, large specific surface area, high crystallinity and strong hydrophobicity, and is suitable for being used as a chlorine scavenger.
Description
Technical Field
The invention belongs to the field of calcium hydroxide powder processing, and particularly relates to a processing method of calcium hydroxide powder.
Background
Chlorine is one of the important raw materials for the chemical industry. The existing chlorine leakage prevention measures mainly comprise a packed tower absorption method, a pit burying method, an ammonia neutralization method, a slaked lime dispersion method and the like, and the effects of the methods are not ideal for the sudden occurrence of chlorine leakage, particularly for moving chlorine sources. And the injection method for injecting alkaline powder is the best scheme superior to other methods in emergency sudden liquid chlorine leakage accidents. The key of the spraying method is that a powder with certain characteristics is required.
The spraying method is that chlorine scavenger (alkaline powder) is filled into chlorine gas eliminator, when chlorine gas leaks, the scavenger powder is driven by high-pressure nitrogen gas to be sprayed out of the chlorine gas eliminator, and is spread to a chlorine gas leakage site, and fully contacts with the chlorine gas dissipated in the air to generate physical and chemical reaction, so that chlorine gas is quickly and effectively eliminated, and emergency personnel can enter the site in time. Therefore, the calcium hydroxide powder used as a chlorine gas scavenger must have the following requirements: firstly, the chemical activity is high, and the reaction speed with chlorine is high; the powder injection method is a gas/solid mass transfer process with chemical reaction, and physical and chemical reactions occur on the surface of the powder, so that the powder is required to have a larger surface area, the gas/solid contact area is increased, and the removal efficiency is improved; thirdly, the powder has moisture resistance, caking resistance and excellent fluidity; and fourthly, the scavenger and the reactant thereof do not produce secondary pollution.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a processing method of calcium hydroxide powder, which has high reaction activity, good fluidity, large specific surface area, high crystallinity and strong hydrophobicity and is suitable for being used as a chlorine scavenger.
The technical scheme adopted by the invention is as follows:
a processing method of calcium hydroxide powder comprises the following steps:
a. calcining and crushing a limestone raw material into quick lime;
b. feeding quicklime into a first-stage digester, adding water, a dispersing additive and a surfactant for digestion, wherein the water-material ratio for digestion is 0.65-0.8, the stirring speed of the digester is 700-750 rpm, the outlet temperature of the digester is 65-70 ℃, and the digestion time is 15 min;
c. inputting the digested mixture into a secondary digester, adding a dispersed hydrophobic moisture-proof additive into the secondary digester for secondary digestion, wherein no water is added in the secondary digestion, the stirring speed of the digester is 750-800 rpm, the outlet temperature of the digester is 80-85 ℃, and the digestion time is 1 hour;
d. then the calcium hydroxide powder is generated through dehydration, drying and crushing and is input into a storage bin for storage.
Furthermore, the dispersing additive in the step b is polyethylene glycol 200 or polyethylene glycol 400, and the dosage of the polyethylene glycol 200 or the polyethylene glycol 400 is 0.1 to 1 percent of the weight of the quicklime.
Furthermore, in the step b, the surfactant is ethoxylated sodium alkyl sulfate or fatty alcohol ether sodium sulfate, and the using amount of the surfactant is 0.1-0.5% of the weight of the quicklime.
Further, said dispersed hydrophobic moisture resistant additive of step c is selected to contain at least 10% of conventional functional groups selected from alcohols, aldehydes, nitriles, esters, ketones, ethers, sulfates, sulfonates or hydrocarbons.
The invention has the beneficial effects that: the calcium hydroxide powder prepared by the method has the advantages of high reaction activity, good fluidity, small particles, large specific surface area, high crystallinity, complete crystal form, strong hydrophobic property, good air permeability and the like; the chlorine gas scavenging agent is suitable for being used as a chlorine gas scavenging agent, is filled in a pressure storage type dry powder sprayer, has the advantages of long spraying time, small residual quantity in a bottle, uniform spraying and the like under certain conditions, and can quickly and effectively treat chlorine leakage accidents.
Detailed Description
The following examples are provided to illustrate specific embodiments of the present invention.
Example 1
A processing method of calcium hydroxide powder comprises the following steps:
a. calcining and crushing a limestone raw material into quick lime;
b. feeding quicklime into a first-stage digester, adding water, a dispersing additive and a surfactant for digestion, wherein the water-material ratio for digestion is 0.65-0.8, the stirring speed of the digester is 700-750 rpm, the outlet temperature of the digester is 65-70 ℃, and the digestion time is 15 min;
c. inputting the digested mixture into a secondary digester, adding a dispersed hydrophobic moisture-proof additive into the secondary digester for secondary digestion, wherein no water is added in the secondary digestion, the stirring speed of the digester is 750-800 rpm, the outlet temperature of the digester is 80-85 ℃, and the digestion time is 1 hour;
d. then the calcium hydroxide powder is generated through dehydration, drying and crushing and is input into a storage bin for storage.
And the dispersing additive in the step b is polyethylene glycol 200 or polyethylene glycol 400, and the dosage of the dispersing additive is 0.1-1% of the weight of the quicklime.
In the step b, the surfactant is ethoxylated sodium alkyl sulfate or fatty alcohol ether sodium sulfate, and the using amount of the surfactant is 0.1-0.5% of the weight of the quicklime.
Said dispersed hydrophobic moisture resistant additive of step c is selected to contain at least 10% of conventional functional groups selected from the group consisting of alcohols, aldehydes, nitriles, esters, ketones, ethers, sulfates, sulfonates, and hydrocarbons.
The calcium hydroxide powder prepared by the method has the advantages of high reaction activity, good fluidity, small particles, large specific surface area, high crystallinity, complete crystal form, strong hydrophobic property, good air permeability and the like.
The calcium hydroxide powder is suitable for being used as a chlorine leakage scavenger, and the reaction principle of the calcium hydroxide powder and chlorine is as follows:
2Ca(OH)2+2Cl2=CaCl2+Ca(OCl)2+2H2O
3Ca(OCl)2= Ca(CO3)2+CaCl2
the reaction products are mainly calcium chloride and calcium carbonate, and no secondary pollution is caused.
The calcium hydroxide powder prepared by the invention is filled in a pressure storage type dry powder sprayer, has the advantages of long spraying time, small residual quantity in a bottle, uniform spraying and the like under certain conditions, and can quickly and effectively treat chlorine leakage accidents.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. The present invention is not limited to the above-described embodiments, which are described in the specification and illustrated only for illustrating the principle of the present invention, but various changes and modifications may be made within the scope of the present invention as claimed without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A processing method of calcium hydroxide powder is characterized by comprising the following steps:
a. calcining and crushing a limestone raw material into quick lime;
b. feeding quicklime into a first-stage digester, adding water, a dispersing additive and a surfactant for digestion, wherein the water-material ratio for digestion is 0.65-0.8, the stirring speed of the digester is 700-750 rpm, the outlet temperature of the digester is 65-70 ℃, and the digestion time is 15 min;
c. inputting the digested mixture into a secondary digester, adding a dispersed hydrophobic moisture-proof additive into the secondary digester for secondary digestion, wherein no water is added in the secondary digestion, the stirring speed of the digester is 750-800 rpm, the outlet temperature of the digester is 80-85 ℃, and the digestion time is 1 hour;
d. then the calcium hydroxide powder is generated through dehydration, drying and crushing and is input into a storage bin for storage.
2. The method for processing calcium hydroxide powder according to claim 1, wherein: and the dispersing additive in the step b is polyethylene glycol 200 or polyethylene glycol 400, and the dosage of the dispersing additive is 0.1-1% of the weight of the quicklime.
3. The method for processing calcium hydroxide powder according to claim 1, wherein: in the step b, the surfactant is ethoxylated sodium alkyl sulfate or fatty alcohol ether sodium sulfate, and the using amount of the surfactant is 0.1-0.5% of the weight of the quicklime.
4. The method for processing calcium hydroxide powder according to claim 1, wherein: said dispersed hydrophobic moisture resistant additive of step c is selected to contain at least 10% of conventional functional groups selected from the group consisting of alcohols, aldehydes, nitriles, esters, ketones, ethers, sulfates, sulfonates, and hydrocarbons.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010310295.8A CN111517677A (en) | 2020-04-20 | 2020-04-20 | Processing method of calcium hydroxide powder |
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| CN202010310295.8A CN111517677A (en) | 2020-04-20 | 2020-04-20 | Processing method of calcium hydroxide powder |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112358205A (en) * | 2020-11-27 | 2021-02-12 | 广西合山市华纳新材料科技有限公司 | Preparation method of high-activity calcium hydroxide |
| CN113955955A (en) * | 2021-12-10 | 2022-01-21 | 安徽前江超细粉末科技有限公司 | Method for solving problem of easy caking in high-activity lime slaking process |
| CN115321845A (en) * | 2022-08-31 | 2022-11-11 | 广西华纳新材料股份有限公司 | Preparation method of large-particle calcium hydroxide with regular morphology |
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| CN106746763A (en) * | 2016-12-05 | 2017-05-31 | 南京格暠环保科技有限公司 | A kind of preparation method of dry production modified food level calcium hydroxide |
| CN108178175A (en) * | 2018-03-05 | 2018-06-19 | 南京格暠环保科技有限公司 | The preparation method of calcium hydroxide special for plastic heat stabilizer |
| CN108285280A (en) * | 2018-03-28 | 2018-07-17 | 董小琳 | A kind of preparation method of food-grade calcium hydroxide |
| 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 |
| CN109608061A (en) * | 2018-12-26 | 2019-04-12 | 南京鲁兴科技有限公司 | A kind of quicklime slaking method |
| 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 |
| CN110078390A (en) * | 2019-06-18 | 2019-08-02 | 邓金营 | A kind of preparation method of high-purity high-quality calcium oxide and calcium hydroxide powder |
-
2020
- 2020-04-20 CN CN202010310295.8A patent/CN111517677A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106746763A (en) * | 2016-12-05 | 2017-05-31 | 南京格暠环保科技有限公司 | A kind of preparation method of dry production modified food level calcium hydroxide |
| CN108178175A (en) * | 2018-03-05 | 2018-06-19 | 南京格暠环保科技有限公司 | The preparation method of calcium hydroxide special for plastic heat stabilizer |
| CN108285280A (en) * | 2018-03-28 | 2018-07-17 | 董小琳 | A kind of preparation method of food-grade calcium hydroxide |
| 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 |
| CN109608061A (en) * | 2018-12-26 | 2019-04-12 | 南京鲁兴科技有限公司 | A kind of quicklime slaking method |
| 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 |
| CN110078390A (en) * | 2019-06-18 | 2019-08-02 | 邓金营 | A kind of preparation method of high-purity high-quality calcium oxide and calcium hydroxide powder |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112358205A (en) * | 2020-11-27 | 2021-02-12 | 广西合山市华纳新材料科技有限公司 | Preparation method of high-activity calcium hydroxide |
| CN113955955A (en) * | 2021-12-10 | 2022-01-21 | 安徽前江超细粉末科技有限公司 | Method for solving problem of easy caking in high-activity lime slaking process |
| CN115321845A (en) * | 2022-08-31 | 2022-11-11 | 广西华纳新材料股份有限公司 | Preparation method of large-particle calcium hydroxide with regular morphology |
| CN115321845B (en) * | 2022-08-31 | 2023-04-07 | 广西华纳新材料股份有限公司 | Preparation method of large-particle calcium hydroxide with regular shape |
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Application publication date: 20200811 |
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