CN103588487B - Low-expansion ceramic roller, and preparation method thereof - Google Patents
Low-expansion ceramic roller, and preparation method thereof Download PDFInfo
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- CN103588487B CN103588487B CN201210292799.7A CN201210292799A CN103588487B CN 103588487 B CN103588487 B CN 103588487B CN 201210292799 A CN201210292799 A CN 201210292799A CN 103588487 B CN103588487 B CN 103588487B
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- fused alumina
- white fused
- low
- alumina sand
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- 239000000919 ceramic Substances 0.000 title claims abstract description 119
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 63
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000000843 powder Substances 0.000 claims abstract description 54
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 52
- 239000011707 mineral Substances 0.000 claims abstract description 52
- 238000000498 ball milling Methods 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 27
- 238000003756 stirring Methods 0.000 claims abstract description 26
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 16
- ATYZRBBOXUWECY-UHFFFAOYSA-N zirconium;hydrate Chemical compound O.[Zr] ATYZRBBOXUWECY-UHFFFAOYSA-N 0.000 claims abstract description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 52
- 239000004576 sand Substances 0.000 claims description 52
- 238000000034 method Methods 0.000 claims description 45
- 230000008569 process Effects 0.000 claims description 39
- INJRKJPEYSAMPD-UHFFFAOYSA-N aluminum;silicic acid;hydrate Chemical class O.[Al].[Al].O[Si](O)(O)O INJRKJPEYSAMPD-UHFFFAOYSA-N 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 33
- 239000011230 binding agent Substances 0.000 claims description 26
- 238000007670 refining Methods 0.000 claims description 19
- 229910052850 kyanite Inorganic materials 0.000 claims description 18
- 239000010443 kyanite Substances 0.000 claims description 18
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 16
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 16
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 16
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 15
- 239000002689 soil Substances 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 13
- 229910052851 sillimanite Inorganic materials 0.000 claims description 13
- 238000007493 shaping process Methods 0.000 claims description 5
- 238000005452 bending Methods 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 abstract description 4
- 239000010431 corundum Substances 0.000 abstract description 3
- 229910052593 corundum Inorganic materials 0.000 abstract description 3
- 239000004927 clay Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 238000003825 pressing Methods 0.000 abstract 1
- 238000005245 sintering Methods 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- 230000006872 improvement Effects 0.000 description 10
- 238000000462 isostatic pressing Methods 0.000 description 9
- 238000005507 spraying Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000011819 refractory material Substances 0.000 description 4
- 238000013467 fragmentation Methods 0.000 description 3
- 238000006062 fragmentation reaction Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000011236 particulate material Substances 0.000 description 3
- 208000035126 Facies Diseases 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 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
- 238000005516 engineering process Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000003245 working effect Effects 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- -1 zirconium silicates Chemical class 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a low-expansion ceramic roller. The low-expansion ceramic roller comprises following main raw materials: electro-fused mullite, pulverized corundum, and mineral raw materials. Thermal expansion coefficient of the low-expansion ceramic roller ranges from 3.5 to 5.8*10<-6>/DEG C. The invention also discloses a preparation method of the low-expansion ceramic roller. The preparation method comprises following steps: refractory clay, aluminum oxide, the mineral raw materials, zirconium silicate and water are delivered into a ball mill for ball milling; electro-fused mullite particles and pulverized corundum are delivered into the ball mill for a second time of ball milling or stirring so as to obtain a slurry; the slurry is dried into powder, and is subjected to moulding, isostatic static pressing processing and sintering so as to obtain the low-expansion ceramic roller with the thermal expansion coefficient of 3.5 to 5.8*10<-6>/DEG C. According to the preparation method, the thermal expansion coefficient of the low-expansion ceramic roller is relatively low, bending strength is high, quick cooling and quick heating resistance is high, service life is long, and the low-expansion ceramic roller is suitable for application in areas with large temperature difference such as preheating zone or rapid cooling zone of a roller kiln.
Description
Technical field
The present invention relates to the processing and fabricating technical field of ceramic rod, particularly a kind of low bulk type ceramic rod and preparation method thereof.
Background technology
Current roller kiln are widely used in the production of building and snitaryware, the corundum-mullite material that what its ceramic rod used adopted mostly is is main raw material with aluminum oxide and emergy, because its principal crystalline phase contains a large amount of corundum phases, so its coefficient of expansion is comparatively large, the thermal expansivity (room temperature ~ 1000 DEG C) of conventional ceramic roller rod is usually 6.0 ~ 6.5
10
-6within DEG C scope.Excessive thermal expansivity, cause ceramic rod can produce larger volumetric expansion when being heated, at preheating zone and the chilling band of roller rod kiln, due to crossing of cold-hot wind, at ceramic rod, there is the huge temperature difference up and down, thus cause the expansion of ceramic rod inconsistent and produce flexural deformation, diastrophic degree is directly proportional to the size of ceramic rod thermal expansivity.Bending ceramic rod can cause the course of product in kiln to change, and product can extrude mutually or collide, thus has had a strong impact on the quality of burning till product.
In view of this, provide a kind of ceramic rod with low thermal coefficient of expansion to overcome the defect existed in prior art, and the preparation method providing described ceramic rod is problem demanding prompt solution in the industry.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of ceramic rod of low bulk type, is applicable to the region that the temperature difference such as preheating zone or chilling band of roller kiln is larger.
Technical problem to be solved by this invention is also, provides a kind of method preparing the ceramic rod of above-mentioned low bulk type.
For reaching above-mentioned technique effect, the invention provides a kind of low bulk type ceramic rod, its main raw material is electrofused mullite, white fused alumina sand, raw mineral materials;
The thermal expansivity of described ceramic rod is 3.5 ~ 5.8
10
-6/ DEG C.
As the improvement of such scheme, its main raw material formula by weight percentage of described ceramic rod is as follows:
Electrofused mullite 20 ~ 40%
White fused alumina sand 2 ~ 20%
Raw mineral materials 2 ~ 20%
Fireclay 15 ~ 50%
Aluminum oxide 10 ~ 40%
Zirconium silicate 1 ~ 15%.
As the improvement of such scheme, one or more in kyanite class mineral selected by described raw mineral materials;
Described kyanite class mineral comprise kyanite, sillimanite and andaluzite.
As the improvement of such scheme, the fineness of described raw mineral materials is 3 ~ 40
, the granularity of described electrofused mullite and white fused alumina sand is 30 ~ 150 orders, and described aluminum oxide grain size is 0.1 ~ 10
.
As the improvement of such scheme, the weight ratio of described electrofused mullite and white fused alumina sand is 2.5 ~ 3.5:0.5 ~ 1.5.
As the improvement of such scheme, described ceramic rod raw material by weight percentage also comprises:
Binding agent 0.1 ~ 5.0%;
Described binding agent is carboxymethyl cellulose.
Correspondingly, for reaching above-mentioned technique effect, present invention also offers a kind of preparation method of low bulk type ceramic rod, comprising:
By fireclay, aluminum oxide, raw mineral materials, zirconium silicate and water join in ball mill and carry out a ball milling;
Electrofused mullite particle and white fused alumina sand are joined in described ball mill, carries out secondary ball milling or stirring, obtain slurry;
Described slurry is dried into powder, then through shaping, isostatic pressed process, burn till after to obtain thermal expansivity be 3.5 ~ 5.8
10
-6/ DEG C ceramic rod.
As the improvement of such scheme, the time controling of a described ball milling is at 0.5 ~ 2h, and the time controling of described secondary ball milling or stirring is at 0.1 ~ 1h.
As the improvement of such scheme, described slurry is dried into powder, then through shaping, isostatic pressed process, burn till after to obtain thermal expansivity be 3.5 ~ 5.8
10
-6/ DEG C ceramic rod step in, comprising:
Described slurry is dried into powder;
Add binding agent and water, described binding agent and described powder stirring is even, obtain pug;
Described pug is carried out mud refining by soil kneader, obtains mud bar;
Described mud bar is carried out plasticity extrusion moulding by forcing machine, obtains roller blank tube;
Described roller blank tube is dried;
The described roller blank tube through drying is carried out isostatic pressed process, and the pressure-controlling of described isostatic pressed process is in the scope of 50 ~ 250Mpa;
Burnt till by the described roller blank tube through isostatic pressed process high temperature at 1500 ~ 1700 DEG C, obtaining thermal expansivity is 3.5 ~ 5.8
10
-6/ DEG C ceramic rod.
As the improvement of such scheme, described ceramic rod main raw material formula is by weight percentage as follows:
Electrofused mullite 20 ~ 40%
White fused alumina sand 2 ~ 20%
Raw mineral materials 2 ~ 20%
Fireclay 15 ~ 50%
Aluminum oxide 10 ~ 40%
Zirconium silicate 1 ~ 15%;
Binding agent 0.1 ~ 5.0%;
One or more in kyanite class mineral selected by described raw mineral materials, and described kyanite class mineral comprise kyanite, sillimanite and andaluzite;
The fineness of described raw mineral materials is 3 ~ 40
, the granularity of described electrofused mullite and white fused alumina sand is 30 ~ 150 orders, and described aluminum oxide grain size is 0.1 ~ 10
;
The weight ratio of described electrofused mullite and white fused alumina sand is 2.5 ~ 3.5:0.5 ~ 1.5;
Described binding agent is carboxymethyl cellulose.
Implement the present invention and there is following beneficial effect:
In the professional skill field relating to ceramic rod, compared with prior art, under the condition of room temperature ~ 1000 DEG C, the thermal expansivity of existing ceramic rod is generally 6.0 ~ 6.5
10
-6dEG C.And the technological merit of ceramic rod of the present invention has lower thermal expansivity 3.5 ~ 5.8
10
-6/ DEG C (room temperature ~ 1000 DEG C).The preheating zone that low bulk type ceramic rod of the present invention temperature difference in roller kiln is larger and chilling band are less likely to occur to bend when using, thus ensure the normal operation of burning till product, solve conventional roller rod in this region easy diastrophic problem.The production cost of this ceramic rod is substantially identical with conventional roller rod, and anti-bending strength outclass conventional ceramic roller rod, one of requisite auxiliary products that genus ceramic rod uses in roller kiln.Particularly, its principle is as follows:
The kyanite class raw mineral materials (comprising kyanite, sillimanite and andaluzite) that the present invention adopts, at high temperature can produce acicular mullite crystal seed, due to the existence of mullite seed, the formation of ceramic rod mullite crystal can be promoted, thus the mullitization that improve in ceramic rod, reduce the coefficient of expansion of ceramic rod.
The present invention introduces part zirconium silicate in ceramic rod substrate material, and at high temperature zirconium silicate can decomposite zirconium white, thus plays toughen and intensify effect to mullite, improves the applied at elevated temperature performance of ceramic rod.
What the ceramic rod aggregate in the present invention adopted is that the mode that electrofused mullite and white fused alumina sand facies combine adds, electrofused mullite add the coefficient of expansion that greatly can reduce ceramic rod, but because the intensity of electrofused mullite is lower, easily there is transgranular fracture when being subject to external mechanical force impact, and roller rod was lost efficacy.Therefore, introducing portion white fused alumina sand in electrofused mullite, when being subject to external mechanical force and impacting, the white fused alumina sand that intensity is higher can stop the continuation expansion of crackle, thus improves the Resisting fractre intensity of ceramic rod entirety.In addition, the existence of white fused alumina sand, burns till in process of cooling at roller rod, and due to the problem of expansion mismatch, meeting generation fine crack around white fused alumina sand, the existence of these fine cracks can improve the fracture toughness property of ceramic rod and anti-rapid heat cycle performance further.
In the present invention, ceramic rod have employed the technique of isostatic pressed process, roller blank tube is under huge pressure, and the particulate material in base pipe can be reset, and forms crisscross structure, improve the mechanical property of this ceramic rod, and then extend the work-ing life of this ceramic rod.
In sum, ceramic rod of the present invention has lower thermal expansivity, and bending strength is high, Resisting fractre good toughness, and anti-rapid heat cycle performance is good, long service life, is applicable to the region that the temperature difference such as preheating zone or chilling band of roller kiln is larger.
Accompanying drawing explanation
Fig. 1 is the schema of the preparation method of a kind of low bulk type of the present invention ceramic rod;
Fig. 2 is the another schema of the preparation method of a kind of low bulk of the present invention type ceramic rod.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
Embodiments provide a kind of low bulk type ceramic rod, its main raw material is electrofused mullite, white fused alumina sand, raw mineral materials;
The thermal expansivity of described ceramic rod is 3.5 ~ 5.8
10
-6/ DEG C.
Preferably, the thermal expansivity of described ceramic rod is 4.0 ~ 5.5
10
-6/ DEG C.
It should be noted that, the thermal expansivity of described ceramic rod is the thermal expansivity under room temperature to 1000 DEG C condition.
Its main raw material formula by weight percentage of described ceramic rod is as follows:
Electrofused mullite 20 ~ 40%
White fused alumina sand 2 ~ 20%
Raw mineral materials 2 ~ 20%
Fireclay 15 ~ 50%
Aluminum oxide 10 ~ 40%
Zirconium silicate 1 ~ 15%.
Preferably, its main raw material formula by weight percentage of described ceramic rod is as follows:
Electrofused mullite 25 ~ 30%
White fused alumina sand 5 ~ 15%
Raw mineral materials 5 ~ 15%
Fireclay 20 ~ 40%
Aluminum oxide 15 ~ 30%
Zirconium silicate 3 ~ 10%.
It should be noted that, described ceramic rod raw material by weight percentage, also comprises:
Binding agent 0.1 ~ 5.0%.
Preferably, the add-on of described binding agent is 1.0 ~ 3.0%.
In the main raw material formula of above-mentioned ceramic rod:
One, one or more in kyanite class mineral selected by described raw mineral materials; Described kyanite class mineral comprise kyanite, sillimanite and andaluzite.
Preferably, the one in kyanite, sillimanite and andaluzite selected by described raw mineral materials.
The fineness of described raw mineral materials is 3 ~ 40
.
Preferably, the fineness of described raw mineral materials is 10 ~ 30
.
It should be noted that, kyanite class mineral belong to high aluminum mineral raw material, and it comprises the anhydrous silicate mineral of kyanite, sillimanite (having another name called sillmanite, fibrolite) and andaluzite 3 kinds of isomerisms, and its chemical composition is Al
2o
3siO
2.Kyanite mineral have following operational characteristic: 1. thermal expansivity: kyanite mineral are cubical expansivity 16%-18% in heat-processed.2. stability: kyanite mineral production refractory materials stability is higher than fireclay refractory 1.5 times.3. refractoriness is high: the refractoriness of general fireclay refractory is 1670-1770 DEG C, and the refractory materials of kyanite is greater than 1790 DEG C usually, the tallest and the biggest in 1850 DEG C.4. non-reversibility: the calcination of kyanite mineral becomes mullite is an irreversible conversion.Temperature less than 1810 DEG C, it is stable.
Therefore, the kyanite class raw mineral materials (comprising kyanite, sillimanite and andaluzite) that ceramic rod of the present invention adopts, at high temperature can produce acicular mullite crystal seed, due to the existence of mullite seed, the formation of ceramic rod mullite crystal can be promoted, thus the mullitization that improve in ceramic rod, reduce the coefficient of expansion of ceramic rod.Mullite refractory has the advantages that high temperature lower volume is stablized, rate of expansion is low, resistance to chemical corrosion is strong, physical strength is high and thermal shock resistance is strong.
Two, the present invention introduces 1 ~ 15% zirconium silicate in ceramic rod substrate material, and at high temperature zirconium silicate can decomposite zirconium white, thus plays toughen and intensify effect to mullite, improves the applied at elevated temperature performance of ceramic rod.
Three, the granularity of described electrofused mullite and white fused alumina sand is 30 ~ 150 orders.
Preferably, the granularity of electrofused mullite and white fused alumina sand is 40 ~ 120 orders.
The weight ratio of described electrofused mullite and white fused alumina sand is 2.5 ~ 3.5:0.5 ~ 1.5.
Preferably, the weight ratio of described electrofused mullite and white fused alumina sand is 3:1.
What the ceramic rod aggregate in the present invention adopted is that the mode that electrofused mullite and white fused alumina sand facies combine adds, electrofused mullite add the coefficient of expansion that greatly can reduce ceramic rod, but because the intensity of electrofused mullite is lower, easily there is transgranular fracture when being subject to external mechanical force impact, and roller rod was lost efficacy.Therefore, introducing portion white fused alumina sand in electrofused mullite, when being subject to external mechanical force and impacting, the white fused alumina sand that intensity is higher can stop the continuation expansion of crackle, thus improves the Resisting fractre intensity of ceramic rod entirety.In addition, the existence of white fused alumina sand, burns till in process of cooling at roller rod, and due to the problem of expansion mismatch, meeting generation fine crack around white fused alumina sand, the existence of these fine cracks can improve the fracture toughness property of ceramic rod and anti-rapid heat cycle performance further.
Four, described aluminum oxide grain size is 0.1 ~ 10
.
Preferably, described aluminum oxide grain size is 1 ~ 5
.
Five, described binding agent can select carboxymethyl cellulose.
Six, the present invention adopts the fireclay of 15 ~ 50%.
Wherein, fireclay refers to that refractoriness is greater than 1580 DEG C, can does the clay of refractory materials and the bauxite as refractory materials.Except there is higher refractoriness, the stability of volume can be kept under the high temperature conditions, and there is slag resistance, resistivity to rapid heat cycle, and certain physical strength, abnormal firm after calcining.
In a word, ceramic rod of the present invention has lower thermal expansivity, and be less likely to occur to bend when the preheating zone that the temperature difference is larger in roller kiln and chilling band use, bending strength is high, Resisting fractre good toughness, and anti-rapid heat cycle performance is good, long service life.The present invention is applicable to the larger region of the temperature difference such as the preheating zone of roller kiln or chilling band, belongs to one of requisite auxiliary products that ceramic rod uses in roller kiln.
Correspondingly, see Fig. 1, present invention also offers a kind of preparation method of low bulk type ceramic rod, comprising:
S101, by fireclay, aluminum oxide, raw mineral materials, zirconium silicate and water join in ball mill and carry out a ball milling.
The time controling of a described ball milling is at 0.5 ~ 2h.
S102, joins in described ball mill by electrofused mullite particle and white fused alumina sand, carries out secondary ball milling or stirring, obtain slurry.
The time controling of described secondary ball milling or stirring is at 0.1 ~ 1h.
In step S101 and S102, adding successively (weight percent) of surface compositions pressed by described ceramic rod raw material:
Electrofused mullite 20 ~ 40%
White fused alumina sand 2 ~ 20%
Raw mineral materials 2 ~ 20%
Fireclay 15 ~ 50%
Aluminum oxide 10 ~ 40%
Zirconium silicate 1 ~ 15%.
Preferably, its main raw material formula by weight percentage of described ceramic rod is as follows:
Electrofused mullite 25 ~ 30%
White fused alumina sand 5 ~ 15%
Raw mineral materials 5 ~ 15%
Fireclay 20 ~ 40%
Aluminum oxide 15 ~ 30%
Zirconium silicate 3 ~ 10%.
S103, is dried into powder by described slurry, then through shaping, isostatic pressed process, burn till after to obtain thermal expansivity be 3.5 ~ 5.8
10
-6/ DEG C ceramic rod.
Preferably, the thermal expansivity of described ceramic rod is 4.0 ~ 5.5
10
-6/ DEG C.
It should be noted that, the thermal expansivity of described ceramic rod is the thermal expansivity under room temperature to 1000 DEG C condition.
In step S103, comprising:
Described slurry is dried into powder;
Adopt mist projection granulating complete processing, make ceramic rod stock be processed into the particulate material possessing certain fluidity;
Add binding agent and water, described binding agent and described powder stirring is even, obtain pug;
Described pug is carried out mud refining by soil kneader, obtains mud bar;
Described mud bar is carried out plasticity extrusion moulding by forcing machine, obtains roller blank tube;
Described roller blank tube is dried;
The described roller blank tube through drying is carried out isostatic pressed process, and the pressure-controlling of described isostatic pressed process is in the scope of 50 ~ 250Mpa;
Burnt till by the described roller blank tube through isostatic pressed process high temperature at 1500 ~ 1700 DEG C, obtaining thermal expansivity is 3.5 ~ 5.8
10
-6/ DEG C ceramic rod.
It should be noted that, the add-on of binding agent is 0.1 ~ 5.0%, and binding agent can select carboxymethyl cellulose.
Preferably, the add-on of described binding agent is 1.0 ~ 3.0%.
The schema of composition graphs 2, carries out more detailed elaboration to the preparation method of a kind of low bulk of the present invention type ceramic rod, comprising:
S201, by fireclay, aluminum oxide, raw mineral materials, zirconium silicate and water join in ball mill and carry out a ball milling.
The time controling of a described ball milling is at 0.5 ~ 2h.Preferably, the time controling of a described ball milling is at 1h.
Preferably, by 15 ~ 50% fireclays, 10 ~ 40% aluminum oxide, 2 ~ 20% raw mineral materialss, 1 ~ 15% zirconium silicate and additional 20 ~ 35% water join in ball mill and carry out a ball milling 0.5 ~ 2h.
More preferably, by 20 ~ 40% fireclays, 15 ~ 30% aluminum oxide, 5 ~ 15% raw mineral materialss, 3 ~ 10% zirconium silicates and additional 25 ~ 30% water join in ball mill and carry out a ball milling 1h.
It should be noted that, one or more in kyanite class mineral selected by described raw mineral materials; Described kyanite class mineral comprise kyanite, sillimanite and andaluzite.
The fineness of described raw mineral materials is 3 ~ 40
.
Preferably, the fineness of described raw mineral materials is 10 ~ 30
.
Described aluminum oxide grain size is 0.1 ~ 10
.
Preferably, described aluminum oxide grain size is 1 ~ 5
.
S202, joins in described ball mill by electrofused mullite particle and white fused alumina sand, carries out secondary ball milling or stirring, obtain slurry.
The time controling of described secondary ball milling or stirring is at 0.1 ~ 1h.Preferably, the time controling of described secondary ball milling or stirring is at 0.5h.
Preferably, 20 ~ 40% electrofused mullite particles and 2 ~ 20% white fused alumina sand are joined in described ball mill, carry out secondary ball milling or stir 0.1 ~ 1h, obtaining slurry.
More preferably, 25 ~ 30% electrofused mullite particles and 5 ~ 15% white fused alumina sand are joined in described ball mill, carry out secondary ball milling or stir 0.5h, obtaining slurry.
It should be noted that, the granularity of described electrofused mullite and white fused alumina sand is 30 ~ 150 orders.
Preferably, the granularity of electrofused mullite and white fused alumina sand is 40 ~ 120 orders.
Further, the weight ratio of described electrofused mullite and white fused alumina sand is 2.5 ~ 3.5:0.5 ~ 1.5.
Preferably, the weight ratio of described electrofused mullite and white fused alumina sand is 3:1.
S203, is dried into powder by described slurry.
Described mode slurry being dried into powder can select spraying dry or press filtration mud refining.
The water content of the powder after described oven dry is 1 ~ 10%.
Preferably, the water content of the powder after described oven dry is 2 ~ 8%.
Adopt mist projection granulating complete processing or press filtration mud refining technique, make ceramic rod stock be processed into the particulate material possessing certain fluidity, its tap density of such stock is higher, more easily mixes with binding agent.
S204, adds binding agent and water, and described binding agent and described powder stirring is even, obtains pug.
Particularly, after the binding agent adding 0.1 ~ 5.0% and additional 10 ~ 18% water, by described binding agent and described powder stirring even, obtain pug.
Preferably, the add-on of described binding agent is 1.0 ~ 3.0%.
Described binding agent can select carboxymethyl cellulose.
S205, carries out mud refining by described pug by soil kneader, obtains mud bar.
Described soil kneader can select hydraulic direct pushing-type soil kneader or spiral soil kneader.
Preferably, described pug is carried out mud refining 2 ~ 3 times by soil kneader, obtains mud bar.
S206, by described mud bar by carrying out plasticity extrusion moulding in forcing machine, obtains roller blank tube.
Described forcing machine can select hydraulic direct pushing-type plasticity forcing machine or spiral plasticity forcing machine.
S207, dries described roller blank tube.
The moisture of the described roller blank tube through drying is 0.5 ~ 3%.
Preferably, the moisture of the described roller blank tube through drying is 1 ~ 2%.
S208, carries out isostatic pressed process by the described roller blank tube through drying.
The pressure-controlling of described isostatic pressed process is in the scope of 50 ~ 250Mpa.
Preferably, the pressure-controlling of described isostatic pressed process is in the scope of 60 ~ 200Mpa.
S209, burnt till by the described roller blank tube through isostatic pressed process high temperature at 1500 ~ 1700 DEG C, obtaining thermal expansivity is 3.5 ~ 5.8
10
-6/ DEG C ceramic rod.
Preferably, the temperature that high temperature burns till is 1550 ~ 1650 DEG C.
Preferably, the thermal expansivity of described ceramic rod is 4.0 ~ 5.5
10
-6/ DEG C.
It should be noted that, the thermal expansivity of described ceramic rod is the thermal expansivity under room temperature to 1000 DEG C condition.
The present invention is further illustrated below with specific embodiment
Embodiment 1
First by the fireclay of 2250Kg, the aluminum oxide fine powder of 1350Kg, the kyanite fine powder of 600Kg, and the zirconium silicate of 450Kg and the water of 2200Kg to join in the ball mill of 5000L capacity ball milling about 1 hour, and then the white fused alumina sand adding the electrofused mullite particle of 2138Kg and 712Kg ball milling 0.5 hour again.
The slurry that ball milling goes out is prepared into through spraying dry the powder that water ratio is 5%; the powder of drying out adds the carboxymethyl cellulose of 2.0wt%; stir 20 minutes in machine,massing after the water of additional 15wt%; then adopt hydraulic direct pushing-type tablets press mud refining twice, then adopt hydraulic direct pushing-type to go out the extrusion moulding of pipe machine plasticity; under the pressure of 100Mpa, isostatic pressing process process is carried out after the base pipe oven dry of forming; then burn till under high temperature at 1550 ~ 1650 DEG C, the thermal expansivity (room temperature ~ 1000 DEG C) of the ceramic rod prepared is 5.35
10
-6/ DEG C.
Embodiment 2
First by the fireclay of 2100Kg, the aluminum oxide fine powder of 1125Kg, the kyanite fine powder of 900Kg, and the zirconium silicate of 375Kg and the water of 2200Kg to join in the ball mill of 5000L capacity ball milling about 1 hour, and then the white fused alumina sand adding the electrofused mullite particle of 2250Kg and 750Kg ball milling 0.5 hour again.
The slurry that ball milling goes out is through press filtration, mud refining, oven dry fragmentation, be prepared into the powder that water ratio is 8%, the powder of drying out adds the carboxymethyl cellulose of 2.8wt%, stir 20 minutes in machine,massing after the water of additional 12wt%, then adopt spiral soil kneader mud refining twice, then adopt the extrusion moulding of spiral vacuum-extruder plasticity, under the pressure of 180Mpa, isostatic pressing process process is carried out after the base pipe oven dry of forming, then burn till under high temperature at 1550 ~ 1650 DEG C, the thermal expansivity (room temperature ~ 1000 DEG C) of the ceramic rod prepared is 4.75
10
-6/ DEG C.
Embodiment 3
First by the fireclay of 2550Kg, the aluminum oxide fine powder of 1200Kg, the kyanite fine powder of 750Kg, and the zirconium silicate of 450Kg and the water of 2200Kg to join in the ball mill of 5000L capacity ball milling about 1 hour, and then the white fused alumina sand adding the electrofused mullite particle of 1912Kg and 638Kg ball milling 0.5 hour again.
The slurry that ball milling goes out is prepared into through spraying dry the powder that water ratio is 3%, the powder of drying out adds the carboxymethyl cellulose of 2.5wt%, stir 20 minutes in machine,massing after the water of additional 17wt%, adopt spiral soil kneader mud refining twice, then adopt the extrusion moulding of spiral vacuum-extruder plasticity, under the pressure of 90Mpa, isostatic pressing process process is carried out after the base pipe oven dry of forming, then burn till under high temperature at 1550 ~ 1650 DEG C, the thermal expansivity (room temperature ~ 1000 DEG C) of the ceramic rod prepared is 5.45
10
-6/ DEG C.
Embodiment 4
First by the fireclay of 1500Kg, the aluminum oxide fine powder of 2025Kg, the sillimanite fine powder of 1125Kg, and the zirconium silicate of 750Kg and the water of 2200Kg to join in the ball mill of 5000L capacity ball milling about 0.5 hour, and then the white fused alumina sand adding the electrofused mullite particle of 1575Kg and 525Kg ball milling 0.25 hour again.
The slurry that ball milling goes out is prepared into through spraying dry the powder that water ratio is 5%; the powder of drying out adds the carboxymethyl cellulose of 2.0wt%; stir 20 minutes in machine,massing after the water of additional 15wt%; then adopt hydraulic direct pushing-type tablets press mud refining twice, then adopt hydraulic direct pushing-type to go out the extrusion moulding of pipe machine plasticity; under the pressure of 50Mpa, isostatic pressing process process is carried out after the base pipe oven dry of forming; then burn till under high temperature at 1500 ~ 1700 DEG C, the thermal expansivity (room temperature ~ 1000 DEG C) of the ceramic rod prepared is 4.02
10
-6/ DEG C.
Embodiment 5
First by the fireclay of 1875Kg, the aluminum oxide fine powder of 1125Kg, the sillimanite fine powder of 375Kg, and the zirconium silicate of 225Kg and the water of 2200Kg to join in the ball mill of 5000L capacity ball milling about 1.5 hours, and then the white fused alumina sand adding the electrofused mullite particle of 2925Kg and 975Kg ball milling 0.75 hour again.
The slurry that ball milling goes out is through press filtration, mud refining, oven dry fragmentation, be prepared into the powder that water ratio is 8%, the powder of drying out adds the carboxymethyl cellulose of 2.8wt%, stir 20 minutes in machine,massing after the water of additional 12wt%, then adopt spiral soil kneader mud refining twice, then adopt the extrusion moulding of spiral vacuum-extruder plasticity, under the pressure of 200Mpa, isostatic pressing process process is carried out after the base pipe oven dry of forming, then burn till under high temperature at 1500 ~ 1650 DEG C, the thermal expansivity (room temperature ~ 1000 DEG C) of the ceramic rod prepared is 4.78
10
-6/ DEG C.
Embodiment 6
First by the fireclay of 2850Kg, the aluminum oxide fine powder of 750Kg, the sillimanite fine powder of 150Kg, and the zirconium silicate of 150Kg and the water of 2200Kg to join in the ball mill of 5000L capacity ball milling about 2 hours, and then the white fused alumina sand adding the electrofused mullite particle of 2700Kg and 900Kg ball milling 1 hour again.
The slurry that ball milling goes out is prepared into through spraying dry the powder that water ratio is 3%, the powder of drying out adds the carboxymethyl cellulose of 2.5wt%, stir 20 minutes in machine,massing after the water of additional 17wt%, adopt spiral soil kneader mud refining twice, then adopt the extrusion moulding of spiral vacuum-extruder plasticity, under the pressure of 90Mpa, isostatic pressing process process is carried out after the base pipe oven dry of forming, then burn till under high temperature at 1550 ~ 1650 DEG C, the thermal expansivity (room temperature ~ 1000 DEG C) of the ceramic rod prepared is 5.26
10
-6/ DEG C.
Embodiment 7
First by the fireclay of 2250Kg, the aluminum oxide fine powder of 1350Kg, the andaluzite fine powder of 600Kg, and the zirconium silicate of 450Kg and the water of 2200Kg to join in the ball mill of 5000L capacity ball milling about 1 hour, and then the white fused alumina sand adding the electrofused mullite particle of 2136Kg and 712Kg ball milling 0.5 hour again.
The slurry that ball milling goes out is prepared into through spraying dry the powder that water ratio is 5%; the powder of drying out adds the carboxymethyl cellulose of 1.0wt%; stir 20 minutes in machine,massing after the water of additional 15wt%; then adopt hydraulic direct pushing-type tablets press mud refining twice, then adopt hydraulic direct pushing-type to go out the extrusion moulding of pipe machine plasticity; under the pressure of 250Mpa, isostatic pressing process process is carried out after the base pipe oven dry of forming; then burn till under high temperature at 1550 ~ 1650 DEG C, the thermal expansivity (room temperature ~ 1000 DEG C) of the ceramic rod prepared is 3.65
10
-6/ DEG C.
Embodiment 8
First by the fireclay of 2100Kg, the aluminum oxide fine powder of 1125Kg, the andaluzite fine powder of 900Kg, and the zirconium silicate of 375Kg and the water of 2200Kg to join in the ball mill of 5000L capacity ball milling about 1 hour, and then the white fused alumina sand adding the electrofused mullite particle of 2250Kg and 750Kg ball milling 0.5 hour again.
The slurry that ball milling goes out is through press filtration, mud refining, oven dry fragmentation, be prepared into the powder that water ratio is 8%, the powder of drying out adds the carboxymethyl cellulose of 2.1wt%, stir 20 minutes in machine,massing after the water of additional 12wt%, then adopt spiral soil kneader mud refining twice, then adopt the extrusion moulding of spiral vacuum-extruder plasticity, under the pressure of 120Mpa, isostatic pressing process process is carried out after the base pipe oven dry of forming, then burn till under high temperature at 1550 ~ 1650 DEG C, the thermal expansivity (room temperature ~ 1000 DEG C) of the ceramic rod prepared is 4.25
10
-6/ DEG C.
Embodiment 9
First by the fireclay of 2550Kg, the aluminum oxide fine powder of 1200Kg, the andaluzite fine powder of 750Kg, and the zirconium silicate of 450Kg and the water of 2200Kg to join in the ball mill of 5000L capacity ball milling about 1 hour, and then the white fused alumina sand adding the electrofused mullite particle of 1912Kg and 638Kg ball milling 0.5 hour again.
The slurry that ball milling goes out is prepared into through spraying dry the powder that water ratio is 3%, the powder of drying out adds the carboxymethyl cellulose of 1.5wt%, stir 20 minutes in machine,massing after the water of additional 17wt%, adopt spiral soil kneader mud refining twice, then adopt the extrusion moulding of spiral vacuum-extruder plasticity, under the pressure of 160Mpa, isostatic pressing process process is carried out after the base pipe oven dry of forming, then burn till under high temperature at 1550 ~ 1650 DEG C, the thermal expansivity (room temperature ~ 1000 DEG C) of the ceramic rod prepared is 4.73
10
-6/ DEG C.
As from the foregoing, implement the present invention, there is following beneficial effect:
In the professional skill field relating to ceramic rod, compared with prior art, under the condition of room temperature ~ 1000 DEG C, the thermal expansivity of existing ceramic rod is generally 6.0 ~ 6.5
10
-6dEG C.And the technological merit of ceramic rod of the present invention has lower thermal expansivity 3.5 ~ 5.8
10
-6/ DEG C (room temperature ~ 1000 DEG C).The preheating zone that low bulk type ceramic rod of the present invention temperature difference in roller kiln is larger and chilling band are less likely to occur to bend when using, thus ensure the normal operation of burning till product, solve conventional roller rod in this region easy diastrophic problem.The production cost of this ceramic rod is substantially identical with conventional roller rod, and anti-bending strength outclass conventional ceramic roller rod, one of requisite auxiliary products that genus ceramic rod uses in roller kiln.
In a word, ceramic rod of the present invention has lower thermal expansivity, and bending strength is high, Resisting fractre good toughness, and anti-rapid heat cycle performance is good, long service life, is applicable to the region that the temperature difference such as preheating zone or chilling band of roller kiln is larger.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a low bulk type ceramic rod, is characterized in that, its main raw material is electrofused mullite, white fused alumina sand, raw mineral materials;
The thermal expansivity of described ceramic rod is 4.0 ~ 5.5 × 10
-6/ DEG C;
The weight ratio of described electrofused mullite and white fused alumina sand is 2.5 ~ 3.5:0.5 ~ 1.5.
2. low bulk type ceramic rod as claimed in claim 1, is characterized in that, its main raw material formula is by weight percentage as follows:
3. low bulk type ceramic rod as claimed in claim 1 or 2, it is characterized in that, one or more in kyanite class mineral selected by described raw mineral materials;
Described kyanite class mineral comprise kyanite, sillimanite and andaluzite.
4. low bulk type ceramic rod as claimed in claim 3, it is characterized in that, the fineness of described raw mineral materials is 3 ~ 40 μm, and the granularity of described electrofused mullite and white fused alumina sand is 30 ~ 150 orders, and described aluminum oxide grain size is 0.1 ~ 10 μm.
5. low bulk type ceramic rod as claimed in claim 3, it is characterized in that, the weight ratio of described electrofused mullite and white fused alumina sand is 3:1.
6. low bulk type ceramic rod as claimed in claim 3, it is characterized in that, described ceramic rod raw material by weight percentage also comprises:
Binding agent 0.1 ~ 5.0%;
Described binding agent is carboxymethyl cellulose.
7. prepare a method for the low bulk type ceramic rod described in any one of claim 1 ~ 6, it is characterized in that, comprising:
By fireclay, aluminum oxide, raw mineral materials, zirconium silicate and water join in ball mill and carry out a ball milling;
Electrofused mullite particle and white fused alumina sand are joined in described ball mill, carries out secondary ball milling or stirring, obtain slurry;
Described slurry is dried into powder, then through shaping, isostatic pressed process, burn till after to obtain thermal expansivity be 4.0 ~ 5.5 × 10
-6/ DEG C ceramic rod;
Wherein, the weight ratio of described electrofused mullite and white fused alumina sand is 2.5 ~ 3.5:0.5 ~ 1.5.
8. the preparation method of low bulk type ceramic rod as claimed in claim 7, it is characterized in that, the time controling of a described ball milling is at 0.5 ~ 2h, and the time controling of described secondary ball milling or stirring is at 0.1 ~ 1h.
9. the preparation method of low bulk type ceramic rod as claimed in claim 7, it is characterized in that, described slurry is dried into powder, then through shaping, isostatic pressed process, burn till after to obtain thermal expansivity be 4.0 ~ 5.5 × 10
-6/ DEG C ceramic rod step in, comprising:
Described slurry is dried into powder;
Add binding agent and water, described binding agent and described powder stirring is even, obtain pug;
Described pug is carried out mud refining by soil kneader, obtains mud bar;
Described mud bar is carried out plasticity extrusion moulding by forcing machine, obtains roller blank tube;
Described roller blank tube is dried;
The described roller blank tube through drying is carried out isostatic pressed process, and the pressure-controlling of described isostatic pressed process is in the scope of 50 ~ 250MPa;
Burnt till by the described roller blank tube through isostatic pressed process high temperature at 1500 ~ 1700 DEG C, obtaining thermal expansivity is 4.0 ~ 5.5 × 10
-6/ DEG C ceramic rod.
10. the preparation method of the low bulk type ceramic rod as described in any one of claim 7 ~ 9, is characterized in that, described ceramic rod main raw material formula is by weight percentage as follows:
One or more in kyanite class mineral selected by described raw mineral materials, and described kyanite class mineral comprise kyanite, sillimanite and andaluzite;
The fineness of described raw mineral materials is 3 ~ 40 μm, and the granularity of described electrofused mullite and white fused alumina sand is 30 ~ 150 orders, and described aluminum oxide grain size is 0.1 ~ 10 μm;
The weight ratio of described electrofused mullite and white fused alumina sand is 3:1;
Described binding agent is carboxymethyl cellulose.
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| CN105130407A (en) * | 2015-09-02 | 2015-12-09 | 湖州品创孵化器有限公司 | Fire-resistant zirconium corundum bricks with strong high-temperature folding resistance |
| CN109020520B (en) * | 2018-07-24 | 2021-08-27 | 广东金刚新材料有限公司 | Ceramic roller rod with thermal shock resistance and high-temperature creep resistance and preparation method thereof |
| CN108975923B (en) * | 2018-07-24 | 2021-06-11 | 广东金刚新材料有限公司 | Ceramic roller rod with thermal shock resistance and high-temperature volume stability and preparation method thereof |
| CN109574640A (en) * | 2019-01-25 | 2019-04-05 | 山东铭特陶瓷材料有限公司 | The preparation method of high-temperature corundum mullite crucible |
| CN110602811B (en) * | 2019-09-18 | 2021-09-28 | 刘刚 | Ceramic rod heating wire manufacturing process |
| CN112876267B (en) * | 2021-03-24 | 2022-08-05 | 福建安溪马斯特陶瓷有限公司 | Ceramic roller for toughened glass kiln and manufacturing process thereof |
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