CN108558418A - A kind of preparation method of the high-strength calcium hexaluminate refractory material of light weight - Google Patents
A kind of preparation method of the high-strength calcium hexaluminate refractory material of light weight Download PDFInfo
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Abstract
A kind of preparation method of the high-strength calcium hexaluminate refractory material of light weight, it is characterised in that：It the described method comprises the following steps：（1）The aluminium hydroxide of the carbonic acid calcareous raw material of 38~60wt% and 40~62 wt% are mixed, the bonding agent of the sum of the above-mentioned raw materials water of 80~120 wt%, the dispersant of 0.02~0.05wt% and 1~4 wt% is added later, ball milling 3~5 hours obtains mixed slurry；（2）By mixed slurry mist projection granulating, spherical fine particles are obtained；（3）Spherical fine particles are calcined under the conditions of 1000~1200 DEG C and obtain light porous bead；（4）The aluminum oxide raw material of the light porous ball of 15~30wt% and 70~85 wt% are mixed, the bonding agent of 2~6wt% of the sum of above-mentioned raw materials is added later, after stirring evenly, 10~30MPa pressure compression mouldings, it is calcined 6~8 hours under conditions of 1600~1700 DEG C, obtains the high-strength calcium hexaluminate refractory material of light weight.
Description
Technical field
The invention belongs to refractory material or porous ceramic technology fields, particularly relate to a kind of high-strength calcium hexaluminate of light weight
Refractory material and preparation method thereof.
Background technology
High temperature industry has high energy consumption, discharges high feature.Very big attention with society to the energy and environmental protection reduces energy
Consumption, green production has been current high temperature industry task the most urgent.Heat in high temperature industry is most of from refractory material
It distributes and loses.The fireclay insulating refractory that exploitation thermal coefficient is low, temperature in use is high, high-temperature behavior is good is to reduce high temperature industry energy
Source consumes, and reduces the key of discharge.CA6（Calcium hexaluminate）With refractoriness height（1875℃）, the chemical stabilization under alkaline environment
Good, low to the wettability of the metal good characteristics of property, are a kind of excellent refractory materials.Meanwhile CA6It is flat with sheet or plate
The structure of shape can keep larger specific surface area at high temperature, can show preferable heat-proof quality at high temperature.These are special
Sign makes the CA of light weight6It has a very wide range of applications foreground in high temperature insulating field.
Currently, calcium hexaluminate lightweight refractory material is mainly lost using burning or prepared by foaming, such as a kind of Chinese patent " six aluminium
Sour calcium and corundum complex phase porous light heat insulating refractory materials and preparation method thereof "（CN 101928153 A）.This method with
The substances such as calcium carbonate and aluminium oxide are primary raw material, and it is pore former, calcining that addition polystyrene spheres and sawdust etc., which have machine burning lost article,
After obtain calcium hexaluminate lightweight refractory material.Lost article is burnt in such method preparation process to generate gas and be discharged from material internal,
It is formed by mostly coherent open pore, reduces the performance of refractory material.Meanwhile there is machine burning lost article to will produce pernicious gas
With a large amount of CO2, pollute the environment.Chinese patent " a kind of High-strength calcium hexa-aluminate light heat insulation material and preparation method thereof "
（CN 103496993 A）, using nano-calcium carbonate and ρ-Al2O3Micro mist is primary raw material, the method system that alkaline foaming agent is added
For the calcium hexaluminate heat-barrier material containing micro- hole-closing structure has been gone out, obtained material volume density is small, and heat-proof quality is good, but foams
Method technology controlling and process is complex, and it is uneven to easily lead to material, and production efficiency is relatively low.
Chinese patent " a kind of high-strength micropore calcium hexaluminate lightweight aggregate and preparation method thereof ",（CN 105948772 A）With
Hydrated alumina and calcium carbonate are primary raw material, using the side of decomposition in situ during hydrated alumina and calcination of calcium carbonate
Method has prepared the calcium hexaluminate lightweight aggregate of microcellular structure, and this method is simple for process, pollution-free in production process, but chemistry is anti-
Answer rate not easy to control, it is easy to crack in calcination process.
Invention content
The purpose of the present invention be exactly for the above-mentioned prior art in the presence of shortcoming and to provide a kind of light weight high-strength
Calcium hexaluminate refractory material and preparation method thereof, the present invention prepared by the high-strength calcium hexaluminate refractory material of light weight have resistance to pressure
The feature that degree is high, temperature in use is high, high volume has been stablized, it is of the present invention simple for process, in preparation process not
Pernicious gas is generated, environmental protection is conducive to.
The purpose of the present invention can be realized by following technique measures：
The preparation method of the high-strength calcium hexaluminate refractory material of light weight of the present invention includes the following steps：
（1）By the aluminium hydroxide of the carbonic acid calcareous raw material of 38~60wt% and 40~62 wt% mix, later be added above-mentioned raw materials it
With the water of 80~120 wt%, the bonding agent of the dispersant of 0.02~0.05wt% and 1~4 wt%, ball milling 3~5 hours is mixed
Close slurry；
（2）By mixed slurry mist projection granulating, spherical fine particles are obtained；
（3）Spherical fine particles are calcined under the conditions of 1000~1200 DEG C and obtain light porous bead；
（4）The aluminum oxide raw material of the light porous ball of 15~30wt% and 70~85 wt% are mixed, above-mentioned raw materials are added later
The sum of 2~6wt% bonding agent, after stirring evenly, 10~30MPa pressure compression mouldings are forged under conditions of 1600~1700 DEG C
It burns 6~8 hours, obtains the high-strength calcium hexaluminate refractory material of light weight.
Heretofore described carbonic acid calcareous raw material is derived from nano-calcium carbonate, precipitated calcium carbonate, ordinary calcium carbonate or lime
Any one in stone, the grain size of raw material is equal<0.074mm；The dispersant be derived from sodium tripolyphosphate, calgon or
Any one in sodium lignin sulfonate；The bonding agent is lignosulfite, dextrin, methylcellulose, polyethylene
Any one in alcohol or Ludox.
Step of the present invention（3）In prepared light porous ball, accumulation≤0.7g/cm3, particle size be 0.044~
0.3mm；Step（4）Described in aluminum oxide raw material be derived from commercial alumina, Alpha-alumina, electro-corundum, calcining corundum in
Any one or two kinds combination, Yuan expects Li Jing≤0.088mm.
There is spherical pore structure, bulk density to be for the high-strength calcium hexaluminate refractory material of light weight prepared by the present invention
1.3~1.6g/cm3, the reheat linear change of compressive resistance >=60MPa, 1600 DEG C of heat preservations 6 hours is -0.4%~+0.2%.
The present invention using carbonic acid calcareous raw material and aluminium hydroxide as primary raw material, is prepared for first using the method for decomposition in situ
High C/A（Calcium oxide/aluminium oxide）Porous small ball.Then, the porous small ball of high C/A is combined with aluminum oxide raw material, is used
The pore formation mechanism of Reaction-diffusion terms prepares the CA containing spherical pore structures6。
Compared with prior art, the present invention having the advantages that：（1）The high-strength calcium hexaluminate fire resisting of the light weight
Material has spherical pore structure, and closed porosity is high and pore size is controllable；
（2）The high-strength calcium hexaluminate refractory material of the light weight, compressive resistance is high, heat-proof quality is good, temperature in use is high, Neng Gouman
The requirement of sufficient high temperature kiln working lining used；
（3）The high-strength calcium hexaluminate refractory material of the light weight was produced using the mechanism of producing pores of decomposition in situ and Reaction-diffusion terms
It is not added in journey and burns lost article and foaming agent, no noxious gas emission, production efficiency are high, are suitble to large-scale industrial production.
Specific implementation mode
The present invention is further described below with reference to embodiment.
Embodiment 1
（1）The aluminium hydroxide of the nano-calcium carbonate of 38 wt% and 62 wt% are mixed, 90 wt% of the sum of above-mentioned raw materials are added later
Water, 0.05wt% sodium tripolyphosphate be the dextrin of dispersant and 4wt% be bonding agent, ball milling 3 hours obtains mixed slurry；
（2）By mixed slurry mist projection granulating, spherical particle green body is obtained；
（3）Spherical particle green body is calcined under the conditions of 1100 DEG C and obtains light porous ball, the bulk density of porous ball is
0.63g/cm3, particle size is 0.044~0.3mm；
（4）By the light porous ball of 30wt% and the alpha-alumina fine powder of 70wt%（Yuan expects Li Jing≤0.074mm）It mixes, in addition
The dextrin 4wt% as bonding agent for stating the sum of raw material, after stirring evenly, 10MPa pressure compression mouldings, in 1600 DEG C of condition
Lower calcining 8 hours, obtains high-strength light weight calcium hexaluminate fire resistant materials.
The high-strength calcium hexaluminate refractory technology index of light weight prepared by the present embodiment is：
Compressive resistance is 65.8MPa, and bulk density is 1.35 g/cm3, after 1600 DEG C of heat preservations, 6 hours burnings permanent line variation be
Rate -0.3%.
Embodiment 2
（1）The aluminium hydroxide of the precipitated calcium carbonate of 52 wt% and 48 wt% are mixed, 100 wt%'s of the sum of additional above-mentioned raw materials
Water, 0.03wt% sodium lignin sulfonate be the methylcellulose of dispersant and 2wt% be bonding agent, ball milling 4 hours is mixed
Slurry；
（2）By mixed slurry mist projection granulating, spherical particle green body is obtained；
（3）Spheric granules green body is calcined under the conditions of 1150 DEG C and obtains light porous ball, the bulk density of porous ball is
0.52g/cm3, particle size is 0.044~0.3mm；
（4）By the calcining corundum fine powder of the light porous ball of 22wt% and 40wt%（Yuan expects Li Jing≤0.074mm）With 38% industry
Aluminium oxide analysis mixing, is added the methylcellulose 3wt% as bonding agent of the sum of above-mentioned raw materials, after stirring evenly, 20MPa
Compression moulding under pressure calcines 7 hours under conditions of 1650 DEG C, obtains high-strength light weight calcium hexaluminate fire resistant materials.
The high-strength calcium hexaluminate refractory technology index of light weight prepared by the present embodiment is：
Compressive resistance is 70.2MPa, and bulk density is 1.41 g/cm3, after 1600 DEG C of heat preservations, 6 hours burnings permanent line variation be
Rate -0.1%.
Embodiment 3
（1）The aluminium hydroxide of the ordinary calcium carbonate of 60 wt% and 40 wt% are mixed, 100 wt%'s of the sum of additional above-mentioned raw materials
Water, 0.05wt% calgon be the lignosulfite of dispersant and 4wt% be bonding agent, ball milling 5 hours is mixed
Close slurry；
（2）By mixed slurry mist projection granulating, spherical particle green body is obtained；
（3）Spherical particle green body is calcined under the conditions of 1200 DEG C and obtains light porous ball, the bulk density of porous ball is
0.61g/cm3, particle size is 0.044~0.3mm；
（4）By the commercial alumina fine powder of the light porous ball of 20wt% and 80wt%（Raw material particle size 0.074mm）It mixes, in addition
The methylcellulose 3wt% as bonding agent for stating the sum of raw material, after stirring evenly, compression moulding under the conditions of 15MPa,
It is calcined 7 hours under conditions of 1650 DEG C, obtains high-strength light weight calcium hexaluminate fire resistant materials.
The high-strength calcium hexaluminate refractory technology index of light weight prepared by the present embodiment is：
Compressive resistance is 60.5MPa, and bulk density is 1.43 g/cm3, after 1600 DEG C of heat preservations, 6 hours burnings permanent line variation be
Rate -0.2%.
Claims (7)
1. a kind of preparation method of the high-strength calcium hexaluminate refractory material of light weight, it is characterised in that：It the described method comprises the following steps：
（1）By the aluminium hydroxide of the carbonic acid calcareous raw material of 38~60wt% and 40~62 wt% mix, later be added above-mentioned raw materials it
With the water of 80~120 wt%, the bonding agent of the dispersant of 0.02~0.05wt% and 1~4 wt%, ball milling 3~5 hours is mixed
Close slurry；
（2）By mixed slurry mist projection granulating, spherical fine particles are obtained；
（3）Spherical fine particles are calcined under the conditions of 1000~1200 DEG C and obtain light porous bead；
（4）The aluminum oxide raw material of the light porous ball of 15~30wt% and 70~85 wt% are mixed, above-mentioned raw materials are added later
The sum of 2~6wt% bonding agent, after stirring evenly, 10~30MPa pressure compression mouldings are forged under conditions of 1600~1700 DEG C
It burns 6~8 hours, obtains the high-strength calcium hexaluminate refractory material of light weight.
2. the preparation method preparation method of the high-strength calcium hexaluminate refractory material of light weight according to right 1, it is characterised in that：Institute
The carbonic acid calcareous raw material stated is derived from any one in nano-calcium carbonate, precipitated calcium carbonate, ordinary calcium carbonate or lime stone, raw material
Grain size it is equal<0.074mm.
3. the preparation method preparation method of the high-strength calcium hexaluminate refractory material of light weight according to right 1, it is characterised in that：Institute
The dispersant stated is derived from any one in sodium tripolyphosphate, calgon or sodium lignin sulfonate.
4. the preparation method preparation method of the high-strength calcium hexaluminate refractory material of light weight according to right 1, it is characterised in that：Institute
The bonding agent stated is any one in lignosulfite, dextrin, methylcellulose, polyvinyl alcohol or Ludox.
5. the preparation method preparation method of the high-strength calcium hexaluminate refractory material of light weight according to right 1, it is characterised in that：Step
Suddenly（3）In prepared light porous ball, accumulation≤0.7g/cm3, particle size is 0.044~0.3mm.
6. the preparation method preparation method of the high-strength calcium hexaluminate refractory material of light weight according to right 1, it is characterised in that：Step
Suddenly（4）Described in aluminum oxide raw material be derived from commercial alumina, Alpha-alumina, electro-corundum, calcining corundum in it is any one
Kind or two kinds of combination, Yuan expect Li Jing≤0.088mm.
7. the preparation method preparation method of the high-strength calcium hexaluminate refractory material of light weight according to right 1, it is characterised in that：Institute
It is 1.3~1.6g/cm that the high-strength calcium hexaluminate refractory material of light weight of preparation, which has spherical pore structure, bulk density,3, pressure resistance
The reheat linear change of intensity >=60MPa, 1600 DEG C of heat preservations 6 hours is -0.4%~+0.2%.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109320216A (en) * | 2018-11-06 | 2019-02-12 | 江苏中正陶瓷科技有限公司 | A kind of calcium hexaluminate crucible manufacturing modified based on laminar structured rare earth oxide |
| CN109851260A (en) * | 2019-01-18 | 2019-06-07 | 武汉科技大学 | A kind of carbon containing aluminous cement and preparation method thereof |
| CN110436914A (en) * | 2019-07-29 | 2019-11-12 | 武汉科技大学 | A kind of high porosity calcium hexaluminate foamed ceramics and preparation method thereof |
| CN111592281A (en) * | 2020-06-03 | 2020-08-28 | 重庆欧斯克宁保温建材有限公司 | Preparation method of pressure-resistant impact-resistant heat-insulation building material |
| CN112209739A (en) * | 2020-09-29 | 2021-01-12 | 郑州大学 | Lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic and preparation method thereof |
| CN114133257A (en) * | 2020-12-31 | 2022-03-04 | 郑州轻工业大学 | Micro-nano hole heat insulation refractory material containing calcium hexaluminate and preparation method thereof |
| CN116217219A (en) * | 2022-11-30 | 2023-06-06 | 宜兴摩根热陶瓷有限公司 | Preparation method of porous calcium hexaluminate ceramic with uniform structure |
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| CN109320216A (en) * | 2018-11-06 | 2019-02-12 | 江苏中正陶瓷科技有限公司 | A kind of calcium hexaluminate crucible manufacturing modified based on laminar structured rare earth oxide |
| CN109851260A (en) * | 2019-01-18 | 2019-06-07 | 武汉科技大学 | A kind of carbon containing aluminous cement and preparation method thereof |
| CN110436914A (en) * | 2019-07-29 | 2019-11-12 | 武汉科技大学 | A kind of high porosity calcium hexaluminate foamed ceramics and preparation method thereof |
| CN111592281A (en) * | 2020-06-03 | 2020-08-28 | 重庆欧斯克宁保温建材有限公司 | Preparation method of pressure-resistant impact-resistant heat-insulation building material |
| CN112209739A (en) * | 2020-09-29 | 2021-01-12 | 郑州大学 | Lightweight high-strength magnesium aluminate spinel hollow sphere porous ceramic and preparation method thereof |
| CN114133257A (en) * | 2020-12-31 | 2022-03-04 | 郑州轻工业大学 | Micro-nano hole heat insulation refractory material containing calcium hexaluminate and preparation method thereof |
| CN116217219A (en) * | 2022-11-30 | 2023-06-06 | 宜兴摩根热陶瓷有限公司 | Preparation method of porous calcium hexaluminate ceramic with uniform structure |
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