CN111533149A - Preparation method of light high-dispersion calcium oxide - Google Patents
Preparation method of light high-dispersion calcium oxide Download PDFInfo
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- CN111533149A CN111533149A CN202010244990.9A CN202010244990A CN111533149A CN 111533149 A CN111533149 A CN 111533149A CN 202010244990 A CN202010244990 A CN 202010244990A CN 111533149 A CN111533149 A CN 111533149A
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- calcium oxide
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- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000000292 calcium oxide Substances 0.000 title claims abstract description 60
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000006185 dispersion Substances 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 24
- 238000001354 calcination Methods 0.000 claims abstract description 22
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000013078 crystal Substances 0.000 claims abstract description 22
- 238000003763 carbonization Methods 0.000 claims abstract description 19
- 238000003756 stirring Methods 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 13
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 230000029087 digestion Effects 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 9
- 230000008569 process Effects 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 6
- 238000010000 carbonizing Methods 0.000 claims abstract description 5
- 230000007935 neutral effect Effects 0.000 claims abstract description 5
- 235000012255 calcium oxide Nutrition 0.000 claims description 55
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 24
- 239000007789 gas Substances 0.000 claims description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 12
- 239000000920 calcium hydroxide Substances 0.000 claims description 10
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000001509 sodium citrate Substances 0.000 claims description 6
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical group O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical group [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 4
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 4
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 4
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000005054 agglomeration Methods 0.000 abstract description 2
- 230000002776 aggregation Effects 0.000 abstract description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- 239000012798 spherical particle Substances 0.000 abstract 1
- 239000000843 powder Substances 0.000 description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 230000032683 aging Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- C01F11/04—Oxides or hydroxides by thermal decomposition
- C01F11/06—Oxides or hydroxides by thermal decomposition of carbonates
-
- 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
- C01F11/18—Carbonates
- C01F11/182—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds
- C01F11/183—Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by an additive other than CaCO3-seeds the additive being an organic compound
-
- 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
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/30—Particle morphology extending in three dimensions
- C01P2004/32—Spheres
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Geology (AREA)
- Materials Engineering (AREA)
- Thermal Sciences (AREA)
- Physics & Mathematics (AREA)
- Structural Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention discloses a preparation method of light high-dispersion calcium oxide, belonging to the technical field of calcium oxide preparation, and comprising the following steps: digestion treatment; adding a first crystal form control agent; carbonizing treatment: putting the uniformly dispersed calcium hydroxide solution into a carbonization reaction kettle, starting heating and stirring, and introducing CO into the bottommost part of the calcium hydroxide solution at a certain flow rate2Mixing the gas, reacting to alkalescent pH value, and continuously introducing CO2Adding a certain amount of second crystal form control agent into the mixed gas under the state of heating and stirring, reacting to a neutral pH value, and stopping introducing the CO2Mixing the gas; filtering and drying; and (4) calcining. The preparation method comprises the steps of firstly adding two crystal form control agents before and after the carbonization treatment process to prepare spherical calcium oxide with small and uniform particle size, and then calcining and grinding to prepare the calcium oxideThe calcium oxide prepared by the method is dispersed in the form of spherical particles, has the characteristics of light weight and high dispersion, and can effectively prevent agglomeration.
Description
Technical Field
The invention relates to the technical field of calcium oxide preparation, in particular to a preparation method of light high-dispersion calcium oxide.
Background
Calcium oxide (calcium oxide), an inorganic compound, has the chemical formula CaO, commonly known as quicklime. The physical properties are white powder on the surface, off-white when the powder is impure, light yellow or gray when the powder contains impurities, and hygroscopicity. The calcium oxide product has the advantages of good high-temperature performance, strong alkaline slag corrosion resistance, capability of purifying high-temperature melt and the like, and is widely applied to metallurgical industries such as precious metal smelting and the like.
The existing preparation method of calcium oxide mostly uses calcium hydroxide as a raw material, has high production cost, high energy consumption, complex process and environmental pollution.
In addition, calcium oxide is prepared by directly calcining calcium hydroxide as a raw material, most of the generated calcium oxide is large blocks, and the generated calcium oxide can be ground and dispersed, so that the generated calcium oxide has the defects of non-uniform particles, easy agglomeration and the like.
Disclosure of Invention
The invention mainly solves the technical problem of providing a preparation method of light high-dispersion calcium oxide, which can solve the problems existing in the preparation of the calcium oxide by the existing method.
In order to solve the technical problems, the invention adopts a technical scheme that: the preparation method of the light high-dispersion calcium oxide comprises the following steps:
(1) and (3) digestion treatment: mixing quicklime and water according to a certain mass ratio, and carrying out digestion treatment to obtain a sodium hydroxide solution;
(2) adding a first crystal form control agent: adding a certain amount of first crystal form control agent into the calcium hydroxide solution prepared in the step (1), uniformly stirring, and then performing ultrasonic dispersion treatment;
(3) carbonizing treatment: putting the calcium hydroxide solution uniformly dispersed in the step (2) into a carbonization reaction kettle, starting heating and stirring, and introducing CO into the bottommost part of the calcium hydroxide solution at a certain flow rate2Mixing the gas, reacting to alkalescent pH value, and continuously introducing CO2Adding a certain amount of second crystal form control agent into the mixed gas under the state of heating and stirring, reacting to a neutral pH value, and stopping introducing the CO2Mixing the gases to complete the carbonization reaction;
(4) and (3) filtering and drying: filtering the mixture subjected to carbonization treatment in the step (3), washing filter residues with water, and drying to obtain light high-dispersion spherical calcium carbonate;
(5) calcining treatment: and (4) putting the light high-dispersion spherical calcium carbonate prepared in the step (3) into a rotary kiln for heat preservation and calcination, then cooling to below 70 ℃, and grinding to obtain the light high-dispersion calcium oxide.
In a preferred embodiment of the invention, in the step (1), the mass ratio of the quicklime to the water is 8.5-9: 1.
In a preferred embodiment of the present invention, in the step (2), the first crystal form control agent is sodium hexametaphosphate, and the amount of the first crystal form control agent added is 1.5-2.5% of the dry mass of the calcium hydroxide.
In a preferred embodiment of the present invention, in the step (3), the second crystal form controlling agent is a sodium citrate solution with a mass concentration of 10-13%; the addition amount of the second crystal form control agent is 1-1.5% of the dry mass of the calcium hydroxide.
In a preferred embodiment of the present invention, in the step (3), the heating temperature is 40 to 60 ℃, and the stirring speed is 50 to 500 r/min.
In a preferred embodiment of the present invention, in the step (3), the CO2The mixed gas is CO2And N2Wherein the CO is2The volume content of (a) is 85-95% of the total volume of the mixed gas.
In a preferred embodiment of the present invention, in the step (3), the weakly alkaline pH is 8.5 to 9.5.
In a preferred embodiment of the present invention, in the step (5), the calcination process conditions are as follows: the calcination temperature is 1250-1300 ℃, and the calcination time is 18-20 h.
In a preferred embodiment of the present invention, the calcium oxide is in the form of spheres or ellipsoids having a particle size of less than 45 μm, and has a calcium oxide content of more than 97%.
The invention adopts a technical scheme that: the light high-dispersion calcium oxide particles are prepared according to the preparation method of the light high-dispersion calcium oxide.
The invention has the beneficial effects that: the invention relates to a preparation method of light high-dispersion calcium oxide, which comprises the steps of firstly, respectively adding two crystal form control agents before and after a carbonization treatment process to prepare spherical calcium oxide with small and uniform particle size, and then calcining and grinding to prepare calcium oxide.
Detailed Description
The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.
The embodiment of the invention comprises the following steps:
example 1
The invention discloses a preparation method of light high-dispersion calcium oxide, which comprises the following steps:
(1) and (3) digestion treatment: weighing 8.5kg of quicklime and 1kg of water, mixing, performing digestion treatment, then aging for 24h, and sieving by a 200-mesh sieve to obtain a sodium hydroxide solution;
(2) adding a first crystal form control agent: adding sodium hexametaphosphate accounting for 1.5 percent of the dry mass of the calcium hydroxide into the calcium hydroxide solution prepared in the step (1), stirring at the speed of 200r/min for 30min until the solution is uniform, and then performing ultrasonic dispersion treatment at room temperature of 30kHz for 30min for later use;
(3) carbonizing treatment: putting the calcium hydroxide solution uniformly dispersed in the step (2) into a carbonization reaction kettle, setting the heating temperature to be 40 ℃, the stirring speed to be 100 r/min, starting heating and stirring, and introducing CO to the bottommost part of the calcium hydroxide solution at the flow rate of 2.5L/h2Reacting the mixed gas until the pH value of the mixture is 8.5-9.0, and continuously introducing CO2Adding a sodium citrate solution which accounts for 1 percent of the dry basis weight of the calcium hydroxide under the conditions of mixed gas heating and stirring, wherein the mass concentration of the sodium citrate solution is 13 percent, continuing to react until the neutral pH value is 6.5, and stopping introducing the CO2Mixing the gases to complete the carbonization reaction;
the CO is2The mixed gas is CO2And N2Wherein the CO is2Is 85 percent of the total volume of the mixed gas;
(4) and (3) filtering and drying: and (4) filtering the mixture subjected to carbonization treatment in the step (3), washing the filter residue with water for 3-5 times, and drying at 80 ℃ to obtain spherical white powder, namely the light high-dispersion spherical calcium carbonate.
(5) Calcining treatment: and (4) putting the light high-dispersion spherical calcium carbonate prepared in the step (3) into a rotary kiln, performing heat preservation and calcination for 20 hours at the temperature of 1250 +/-10 ℃, then cooling to below 70 ℃, and grinding to obtain the light high-dispersion calcium oxide. The calcination process conditions are as follows: the calcination temperature and the calcination time are 18-20 h.
The average grain diameter of the obtained white powder is 8 μm by adopting an SA-CP3 type centrifugal particle sizer test, the grain diameter distribution rate is more than 95 percent, and the dispersibility is good; the CaO content of the Cu target is 97.5 percent by mass by adopting an X-ray powder diffractometer D/MAX2000 at 40 kV and 100 mA at a scanning speed of 8 (DEG)/min and a scanning angle of 3-80 degrees.
Example 2
The invention discloses a preparation method of light high-dispersion calcium oxide, which comprises the following steps:
(1) and (3) digestion treatment: weighing 9kg of quicklime and 1kg of water, mixing, performing digestion treatment, then aging for 24h, and sieving by a 200-mesh sieve to obtain a sodium hydroxide solution;
(2) adding a first crystal form control agent: adding sodium hexametaphosphate accounting for 2.5 percent of the dry mass of the calcium hydroxide into the calcium hydroxide solution prepared in the step (1), stirring at the speed of 200r/min for 30min until the solution is uniform, and then performing ultrasonic dispersion treatment at room temperature of 30kHz for 30min for later use;
(3) carbonizing treatment: putting the calcium hydroxide solution uniformly dispersed in the step (2) into a carbonization reaction kettle, setting the heating temperature to be 60 ℃, the stirring speed to be 300 r/min, starting heating and stirring, and introducing CO into the bottommost part of the calcium hydroxide solution at the flow rate of 2.5L/h2Reacting the mixed gas until the pH value of the mixed gas is 9.0-9.5, and continuously introducing CO2Adding sodium citrate solution accounting for 1.5 percent of the dry basis weight of the calcium hydroxide under the conditions of mixed gas heating and stirring, wherein the mass concentration of the sodium citrate solution is 10 percent, continuously reacting until the neutral pH value is 6.5, and stopping introducing the CO2Mixing the gases to complete the carbonization reaction;
the CO is2The mixed gas is CO2And N2Wherein the CO is2Is 95% of the total volume of the mixed gas;
(4) and (3) filtering and drying: filtering the mixture subjected to carbonization treatment in the step (3), washing filter residues for 3-5 times, and drying at 80 ℃ to obtain spherical white powder, namely the light high-dispersion spherical calcium carbonate;
(5) calcining treatment: and (4) putting the light high-dispersion spherical calcium carbonate prepared in the step (3) into a rotary kiln, calcining for 18h at 1300 +/-10 ℃, cooling to 80-100 ℃, and grinding to obtain the light high-dispersion calcium oxide.
The average grain diameter of the obtained white powder is 7.5 mu m by adopting an SA-CP3 type centrifugal particle sizer, the grain diameter distribution rate is more than 97 percent, and the dispersibility is good; an X-ray powder diffractometer D/MAX2000 is adopted, and the CaO content in the Cu target is measured to be 98% by mass at 40 kV, 100 mA, the scanning speed of 8(°)/min and the scanning angle of 3-80 ℃.
The invention relates to a preparation method of light high-dispersion calcium oxide, which comprises the steps of firstly preparing spherical micron-sized sodium carbonate, and then sintering the sodium carbonate into calcium oxide particles, specifically, the calcium oxide particles are prepared by adopting carbonization treatment, and a first crystal form control agent is added before carbonization, so that the particle size of the generated calcium carbonate is small and uniform in the subsequent carbonization treatment process and is aggregated in a spherical state; the second crystal control agent is added in the carbonization treatment process, so that the spheres of the calcium carbonate are better regular and uniform, and the dispersibility of the calcium carbonate is improved; and then calcining the generated spherical calcium carbonate to obtain calcium oxide powder with excellent performance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A preparation method of light high-dispersion calcium oxide is characterized by comprising the following steps:
(1) and (3) digestion treatment: mixing quicklime and water according to a certain mass ratio, and carrying out digestion treatment to obtain a sodium hydroxide solution;
(2) adding a first crystal form control agent: adding a certain amount of first crystal form control agent into the calcium hydroxide solution prepared in the step (1), uniformly stirring, and then performing ultrasonic dispersion treatment;
(3) carbonizing treatment: putting the calcium hydroxide solution uniformly dispersed in the step (2) into a carbonization reaction kettle, starting heating and stirring, and introducing CO into the bottommost part of the calcium hydroxide solution at a certain flow rate2Mixing the gas, reacting to alkalescent pH value, and continuously introducing CO2Adding a certain amount of second crystal form control agent into the mixed gas under the state of heating and stirring, reacting to a neutral pH value, and stopping introducing the CO2Mixing the gases to complete the carbonization reaction;
(4) and (3) filtering and drying: filtering the mixture subjected to carbonization treatment in the step (3), washing filter residues with water, and drying to obtain light high-dispersion spherical calcium carbonate;
(5) calcining treatment: and (4) putting the light high-dispersion spherical calcium carbonate prepared in the step (3) into a rotary kiln for heat preservation and calcination, then cooling to below 70 ℃, and grinding to obtain the light high-dispersion calcium oxide.
2. The preparation method of the light high-dispersion calcium oxide according to claim 1, wherein in the step (1), the mass ratio of the quicklime to the water is 8.5-9: 1.
3. The method for preparing light high-dispersion calcium oxide according to claim 1, wherein in the step (2), the first crystal form control agent is sodium hexametaphosphate, and the addition amount of the first crystal form control agent is 1.5-2.5% of the dry weight of the calcium hydroxide.
4. The method for preparing light weight highly dispersed calcium oxide according to claim 1, wherein in the step (3), the second crystal form control agent is a sodium citrate solution with a mass concentration of 10-13%; the addition amount of the second crystal form control agent is 1-1.5% of the dry mass of the calcium hydroxide.
5. The method for preparing light weight highly dispersed calcium oxide according to claim 1, wherein in the step (3), the heating temperature is 40 to 60 ℃ and the stirring speed is 50 to 500 r/min.
6. The method for producing light weight highly dispersed calcium oxide according to claim 1, wherein in the step (3), the CO is present2The mixed gas is CO2And N2Wherein the CO is2The volume content of (a) is 85-95% of the total volume of the mixed gas.
7. The method for preparing light weight highly dispersed calcium oxide according to claim 1, wherein in the step (3), the weakly basic pH is 8.5 to 9.5.
8. The method for preparing light weight highly dispersed calcium oxide according to claim 1, wherein in the step (5), the calcination process conditions are as follows: the calcination temperature is 1250-1300 ℃, and the calcination time is 18-20 h.
9. The method for preparing light weight highly dispersed calcium oxide according to claim 1, wherein the calcium oxide is spherical or ellipsoidal with a particle size of less than 45 μm and has a calcium oxide content of more than 97%.
10. A light high-dispersion calcium oxide particle, characterized in that the light high-dispersion calcium oxide particle is prepared by the method for preparing light high-dispersion calcium oxide according to any one of claims 1 to 8.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113060751A (en) * | 2021-03-26 | 2021-07-02 | 上海南卓新材料科技有限公司 | Preparation method of nano calcium carbonate filler for LED-UV ink and product |
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| CN110172262A (en) * | 2019-04-21 | 2019-08-27 | 宣城新威华化工科技有限公司 | A kind of method of producing nano-calcium carbonate applied to electronic apparatus silicone adhesive |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113060751A (en) * | 2021-03-26 | 2021-07-02 | 上海南卓新材料科技有限公司 | Preparation method of nano calcium carbonate filler for LED-UV ink and product |
| CN113060751B (en) * | 2021-03-26 | 2023-04-18 | 上海南卓新材料科技有限公司 | Preparation method of nano calcium carbonate filler for LED-UV ink and product |
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Application publication date: 20200814 |