CN109678190A - A kind of core-shell structure calcium oxide particle and preparation method thereof - Google Patents
A kind of core-shell structure calcium oxide particle and preparation method thereof Download PDFInfo
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- CN109678190A CN109678190A CN201910133484.XA CN201910133484A CN109678190A CN 109678190 A CN109678190 A CN 109678190A CN 201910133484 A CN201910133484 A CN 201910133484A CN 109678190 A CN109678190 A CN 109678190A
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- calcium oxide
- core
- shell structure
- oxide particle
- particle
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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
- C01F11/04—Oxides or hydroxides by thermal decomposition
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- 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
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- 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
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- 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
- C01P2006/10—Solid density
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- 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
Abstract
The present invention relates to a kind of core-shell structure calcium oxide particles and preparation method thereof.Its technical solution is: first calcium hydroxide particle being placed in the disk or rotary drum of Granulation Equipments, start Granulation Equipments, under conditions of the revolving speed of disk or rotary drum is 20~200 revs/min, Xiang Yuanpan or rotary drum spray into the coupling agent solution for accounting for the 0.5~8wt% of calcium hydroxide particle；Then the calcium hydroxide particle for being coated with coupling agent is taken out, it is 8~24 hours dry under the conditions of 90~110 DEG C；It is placed in heating furnace again, keeps the temperature 1~5 hour under the conditions of 1500~1700 DEG C, natural cooling is to get core-shell structure calcium oxide particle.The partial size of core-shell structure calcium oxide particle is 0.1~8mm, CaO content >=95wt%.Core-shell structure calcium oxide particle prepared by the present invention have the characteristics that it is high using temperature, have stable high-temperature performance good with hydration resistance, be the preferred raw material for preparing the advanced materials such as calcium oxide ceramics and refractory material.
Description
Technical field
The invention belongs to calcium oxide particle technical fields.More particularly to a kind of core-shell structure calcium oxide particle and its preparation side
Method.
Background technique
With the needs of economic development and national defense construction, high-quality high temperature alloy and clean steel demand are increased, smelt skill
Art increasingly tends to advanced and purifying, and harsher requirement is proposed to refractory material.Impurity content requires lower in alloy,
The difficulty of metallurgy will increase in series, this proposes very big challenge to ultralow impurity high temperature alloy metallurgy basis deposit and technology.
But general refractory material more or less can all cause certain pollution to high temperature alloy liquid when smelting, it is difficult to meet super
The rigors of pure smelting.And the refractory material containing free CaO does not pollute metal bath not only, there are also the function for purifying melt
Can, it is the most suitable refractory material for smelting the high-quality high temperature alloy of super clean.
Although the mineral rich in CaO, in nature reserves and its abundant, the problem of calcium oxide easy aquation, constrains
Application of the calcium oxide raw material in metallurgy industry.For a long time, it is material that exploitation, which has the CaO raw material of good hydration resistance,
The important topic that worker faces.Industrial applications calcia material is wanted, it is former to prepare the good calcium oxide of hydration resistance
Material is an important precondition.
In order to obtain the good CaO raw material of hydration resistance, domestic and international technical staff makes a large amount of research work, it is expected that
The hydration resistance for improving CaO raw material sums up the method for being mainly the following: introducing additive method, surface preparation, work
Change sintering, high-temperature calcination or electric smelting method etc..These researchs achieve certain effect, but in actual production and storage and transport process still
Encounter very big difficulty.The substance of some low melting points can be generated by introducing additive, reduce the service performance of product；Surface preparation does not have
The film heat for having and solving the problems, such as the easy aquation of CaO material at all, and formed on surface is easy to decompose, to the structure of material with
Service performance has an adverse effect；The lime stone of dinectly bruning is possible to obtain the oxygen of densified sintering product more than 1900 DEG C of temperature
Change calcium, this is highly difficult for industrial applications, and there is also easy aquation problems for the obtained calcium oxide of this method；?
Useful electric smelting method is melted calcium oxide sand, and crystallization physically well develops, CaO coarse grains, but this sand hydration resistance is still not
It is ideal.
As it can be seen that existing result of study has only delayed the hydration rate of calcium oxide to a certain extent, the reason is that more
Aspect, such as: the calcium oxide green body after presence, high-temperature process the defects of particle surface stomata or crackle is broken into specified grain
The new surface etc. exposed to the used time is spent, the hydration rate of calcium oxide particle can all be made to accelerate.
Summary of the invention
The present invention is directed to overcome the shortage of prior art, it is therefore an objective to provide it is a kind of it is high using temperature, have stable high-temperature performance and resist
The good core-shell structure calcium oxide particle and preparation method thereof of hydrating capacity, can with core-shell structure calcium oxide particle prepared by this method
As the raw material for preparing the advanced materials such as calcium oxide ceramics and refractory material.
To achieve the above object, the technical scheme adopted by the invention is that:
First calcium hydroxide particle is placed in the disk or rotary drum of Granulation Equipments, starts Granulation Equipments, in the disk or
Under conditions of the revolving speed of rotary drum is 20~200 revs/min, Xiang Suoshu disk or rotary drum penetrating account for the calcium hydroxide particle 0.5
The coupling agent solution of~8wt%；Then the calcium hydroxide particle for being coated with coupling agent is taken out, is done under the conditions of 90~110 DEG C
Dry 8~24 hours；It is placed in heating furnace again, keeps the temperature 1~5 hour under the conditions of 1500~1700 DEG C, natural cooling is to get nucleocapsid
Structure calcium oxide particle.
The partial size of the core-shell structure calcium oxide particle is 0.1~8mm, the CaO content of core-shell structure calcium oxide particle >=
95wt%.
The coupling agent solution is one kind of aluminic acid ester solution, metatitanic acid ester solution, zirconic acid lipoprotein solution or aluminium zirconic acid lipoprotein solution.
The Ca (OH) of the calcium hydroxide particle2Content >=95wt%；Partial size is 0.2~12mm.
Due to the adoption of the above technical scheme, the present invention has following good effect compared with prior art:
The thermal decomposition for aluminic acid ester solution, metatitanic acid ester solution, zirconic acid lipoprotein solution or the aluminium zirconic acid lipoprotein solution that the present invention uses produces
Object (aluminium oxide, titanium oxide and zirconium oxide and its composite oxides) and the thermal decomposition product calcium oxide of calcium hydroxide react,
The stable protective shell of forming properties (calcium aluminate, calcium titanate or zirconic acid calcium oxide etc.) on calcium oxide particle surface, by calcium oxide
With air insulated, the aquation of calcium oxide particle is fundamentally avoided.Meanwhile core-shell structure calcium oxide particle obtained is without broken
It is broken, it can be used directly, avoid tradition and be crushed process of granulation again to material hydration resistance bring adverse effect.
Core-shell structure calcium oxide particle prepared by the present invention is through detecting: partial size be 0.1~8mm, CaO content >=95wt%,
Bulk density >=2.7g/cm3；10h is kept under 50 DEG C and 90% damp condition, is dried in 110 DEG C, the aquation of calcium oxide particle
Rate of body weight gain≤0.8%.
Core-shell structure calcium oxide particle prepared by the present invention have it is high using temperature, have stable high-temperature performance and hydration resistance
The good feature of energy, is the preferred raw material for preparing the advanced materials such as calcium oxide ceramics and refractory material.
Specific embodiment
The present invention will be further described With reference to embodiment, not to the limitation of its protection scope.
It is now that the calcium hydroxide particle Unify legislation in present embodiment is as follows to avoid repeating, in embodiment not
It repeats again:
The Ca (OH) of the calcium hydroxide particle2Content >=95wt%；Partial size is 0.2~12mm.
Embodiment 1
A kind of core-shell structure calcium oxide particle and preparation method thereof.It is the step of preparation method described in the present embodiment:
First calcium hydroxide particle is placed in the disk or rotary drum of Granulation Equipments, starts Granulation Equipments, in the disk or
Under conditions of the revolving speed of rotary drum is 20~50 revs/min, Xiang Suoshu disk or rotary drum penetrating account for the calcium hydroxide particle 0.5~
The coupling agent solution of 1wt%；Then the calcium hydroxide particle for being coated with coupling agent is taken out, dry 16 under the conditions of 90~95 DEG C
~24 hours；It is placed in heating furnace again, keeps the temperature 3~5 hours under the conditions of 1500~1600 DEG C, natural cooling is to get nucleocapsid knot
Structure calcium oxide particle.
The coupling agent solution is aluminic acid ester solution.
Core-shell structure calcium oxide particle prepared by the present invention is through detecting: partial size be 0.1~8mm, CaO content be 95~
96wt%, bulk density are 2.7~2.85g/cm3；10h is kept under 50 DEG C and 90% damp condition, is dried in 110 DEG C, core
The aquation rate of body weight gain of shell structure calcium oxide particle is 0.6~0.8%.
Embodiment 2
A kind of core-shell structure calcium oxide particle and preparation method thereof.It is the step of preparation method described in the present embodiment:
First calcium hydroxide particle is placed in the disk or rotary drum of Granulation Equipments, starts Granulation Equipments, in the disk or
Under conditions of the revolving speed of rotary drum is 50~100 revs/min, Xiang Suoshu disk or rotary drum penetrating account for the calcium hydroxide particle 1~
The coupling agent solution of 3wt%；Then the calcium hydroxide particle for being coated with coupling agent is taken out, dry 8 under the conditions of 95~100 DEG C
~16 hours；It is placed in heating furnace again, keeps the temperature 1~3 hour under the conditions of 1600~1700 DEG C, natural cooling is to get nucleocapsid knot
Structure calcium oxide particle.
The coupling agent solution is metatitanic acid ester solution.
Core-shell structure calcium oxide particle prepared by the present invention is through detecting: partial size be 0.1~8mm, CaO content be 95.5~
96.5wt%, bulk density are 2.75~2.9g/cm3；10h is kept under 50 DEG C and 90% damp condition, is dried in 110 DEG C,
The aquation rate of body weight gain of core-shell structure calcium oxide particle is 0.5~0.7%.
Embodiment 3
A kind of core-shell structure calcium oxide particle and preparation method thereof.It is the step of preparation method described in the present embodiment:
First calcium hydroxide particle is placed in the disk or rotary drum of Granulation Equipments, starts Granulation Equipments, in the disk or
Under conditions of the revolving speed of rotary drum is 100~150 revs/min, Xiang Suoshu disk or rotary drum penetrating account for the calcium hydroxide particle 3~
The coupling agent solution of 5wt%；Then the calcium hydroxide particle for being coated with coupling agent is taken out, it is dry under the conditions of 100~105 DEG C
8~16 hours；It is placed in heating furnace again, keeps the temperature 1~3 hour under the conditions of 1600~1700 DEG C, natural cooling is to get nucleocapsid knot
Structure calcium oxide particle.
The coupling agent solution is zirconic acid lipoprotein solution.
Core-shell structure calcium oxide particle prepared by the present invention is through detecting: partial size be 0.1~8mm, CaO content be 96~
97wt%, bulk density are 2.85~3.0g/cm3；10h is kept under 50 DEG C and 90% damp condition, is dried in 110 DEG C, core
The aquation rate of body weight gain of shell structure calcium oxide particle is 0.4~0.6%.
Embodiment 4
A kind of core-shell structure calcium oxide particle and preparation method thereof.It is the step of preparation method described in the present embodiment:
First calcium hydroxide particle is placed in the disk or rotary drum of Granulation Equipments, starts Granulation Equipments, in the disk or
Under conditions of the revolving speed of rotary drum is 150~200 revs/min, Xiang Suoshu disk or rotary drum penetrating account for the calcium hydroxide particle 5~
The coupling agent solution of 8wt%；Then the calcium hydroxide particle for being coated with coupling agent is taken out, it is dry under the conditions of 105~110 DEG C
8~16 hours；It is placed in heating furnace again, keeps the temperature 1~3 hour under the conditions of 1600~1700 DEG C, natural cooling is to get nucleocapsid knot
Structure calcium oxide particle.
The coupling agent solution is aluminium zirconic acid lipoprotein solution.
Core-shell structure calcium oxide particle prepared by the present invention is through detecting: partial size be 0.1~8mm, CaO content be 95~
96wt%, bulk density are 2.8~2.95g/cm3；10h is kept under 50 DEG C and 90% damp condition, is dried in 110 DEG C, core
The aquation rate of body weight gain of shell structure calcium oxide particle is 0.3~0.5%.
Present embodiment has following good effect compared with prior art:
Aluminic acid ester solution, metatitanic acid ester solution, zirconic acid lipoprotein solution or the aluminium zirconic acid lipoprotein solution that present embodiment uses
The thermal decomposition product calcium oxide of thermal decomposition product (aluminium oxide, titanium oxide and zirconium oxide and its composite oxides) and calcium hydroxide is sent out
Raw reaction, the stable protective shell of forming properties (calcium aluminate, calcium titanate or zirconic acid calcium oxide etc.) on calcium oxide particle surface will
Calcium oxide and air insulated fundamentally avoid the aquation of calcium oxide particle.Meanwhile core-shell structure calcium oxide particle obtained without
It need to be crushed, can be used directly, avoid tradition and be crushed process of granulation again to material hydration resistance bring adverse effect.
Present embodiment preparation core-shell structure calcium oxide particle through detecting: partial size be 0.1~8mm, CaO content >=
95wt%, bulk density >=2.7g/cm3；10h is kept under 50 DEG C and 90% damp condition, is dried in 110 DEG C, calcium oxide
Aquation rate of body weight gain≤0.8% of grain.
Core-shell structure calcium oxide particle prepared by present embodiment have it is high using temperature, have stable high-temperature performance and
The good feature of hydration resistance is the preferred raw material for preparing the advanced materials such as calcium oxide ceramics and refractory material.
Claims (4)
1. a kind of preparation method of core-shell structure calcium oxide particle, it is characterised in that: calcium hydroxide particle is first placed in granulation and is set
In standby disk or rotary drum, start Granulation Equipments, under conditions of the revolving speed of the disk or rotary drum is 20~200 revs/min,
The coupling agent solution for accounting for the 0.5~8wt% of calcium hydroxide particle is sprayed into the disk or rotary drum；Then coupling will be coated with
The calcium hydroxide particle of agent takes out, 8~24 hours dry under the conditions of 90~110 DEG C；It is placed in heating furnace again, 1500~
1~5 hour is kept the temperature under the conditions of 1700 DEG C, natural cooling is to get core-shell structure calcium oxide particle.
2. the preparation method of core-shell structure calcium oxide particle according to claim 1, it is characterised in that the coupling agent is molten
Liquid is one kind of aluminic acid ester solution, metatitanic acid ester solution, zirconic acid lipoprotein solution or aluminium zirconic acid lipoprotein solution.
3. the preparation method of core-shell structure calcium oxide particle according to claim 1, it is characterised in that the calcium hydroxide
The Ca (OH) of particle2Content >=95wt%；Partial size is 0.2~12mm.
4. a kind of core-shell structure calcium oxide particle, it is characterised in that the core-shell structure calcium oxide particle is according to claim 1
Core-shell structure calcium oxide particle prepared by the preparation method of core-shell structure calcium oxide particle described in any one of~3.
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| CN201910133484.XA CN109678190A (en) | 2019-02-22 | 2019-02-22 | A kind of core-shell structure calcium oxide particle and preparation method thereof |
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| CN201910133484.XA CN109678190A (en) | 2019-02-22 | 2019-02-22 | A kind of core-shell structure calcium oxide particle and preparation method thereof |
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Cited By (3)
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| CN110041085A (en) * | 2019-04-08 | 2019-07-23 | 武汉科技大学 | A kind of calcium carbon composite and preparation method thereof |
| CN111268711A (en) * | 2020-02-17 | 2020-06-12 | 武汉科技大学 | Coated anti-hydration calcium oxide material and preparation method thereof |
| CN113603125A (en) * | 2021-03-08 | 2021-11-05 | 台湾塑胶工业股份有限公司 | Calcined shellfish shell powder and its preparation method |
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| CN108911710A (en) * | 2018-08-24 | 2018-11-30 | 武汉科技大学 | A kind of calcium oxide particle and preparation method thereof |
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|---|---|---|---|---|
| CN110041085A (en) * | 2019-04-08 | 2019-07-23 | 武汉科技大学 | A kind of calcium carbon composite and preparation method thereof |
| CN111268711A (en) * | 2020-02-17 | 2020-06-12 | 武汉科技大学 | Coated anti-hydration calcium oxide material and preparation method thereof |
| CN113603125A (en) * | 2021-03-08 | 2021-11-05 | 台湾塑胶工业股份有限公司 | Calcined shellfish shell powder and its preparation method |
| CN113603125B (en) * | 2021-03-08 | 2023-02-28 | 台湾塑胶工业股份有限公司 | Calcined shellfish shell powder and its preparation method |
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Application publication date: 20190426 |