CN108046282A - A kind of method for calcinating of kaolin superfine powder - Google Patents
A kind of method for calcinating of kaolin superfine powder Download PDFInfo
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- CN108046282A CN108046282A CN201711317970.4A CN201711317970A CN108046282A CN 108046282 A CN108046282 A CN 108046282A CN 201711317970 A CN201711317970 A CN 201711317970A CN 108046282 A CN108046282 A CN 108046282A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/40—Clays
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01P2004/60—Particles characterised by their size
- C01P2004/61—Micrometer sized, i.e. from 1-100 micrometer
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- 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
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- Inorganic Chemistry (AREA)
- Silicates, Zeolites, And Molecular Sieves (AREA)
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Abstract
The present invention relates to a kind of method for calcinating of kaolin superfine powder, after day kaolin homogenizing, dry, grinding, flash calcining furnace is sent into, then the substance after being quickly cooled down is processed into≤micro mist of 0.044mm fine powders or≤0.010mm uses.The present invention have it is resourceful, calcining it is energy saving, grinding economizes on electricity, many advantages, such as Product Activity is high, yield is big, at low cost, to substitute or partly substitute the silicon ash and alumina powder of refractory concrete, or the admixture of building concrete and cement, achieve the purpose that make full use of resource, reduce discharge, increase income and economize on spending, can be used for the industries such as ceramics, papermaking, rubber, coating, plastics, paint, cable, petrochemical industry, medicine as raw material or filler.
Description
Technical field
A kind of method for calcinating of kaolin superfine powder, to substitute or partly substitute silicon ash and the oxidation of refractory concrete
The admixture of aluminium micro mist or building concrete and cement can be used for ceramics, papermaking, rubber, coating, plastics, paint, electricity
The industries such as cable, petrochemical industry, medicine are as raw material or filler.
Background technology
China possesses abundant kaolin resource, will be kaolin calcined after can obtain calcined kaolin.Calcined kaolin has
Whiteness height, good crystalline, the advantages that unit weight is small, porosity is big, strong covering power, it is widely used in being mainly used for ceramics, papermaking, rubber
The industries such as glue, coating, plastics, paint, cable, petrochemical industry, medicine are as raw material or filler.It is presently used for setting for calcined kaolin
It is standby mainly to have fixed bed（Down-draft kiln, tunnel oven, pushed bat kiln and shuttle kiln）With semifixed bed type（Vertical furnace, rotary kiln）Formula kiln
Stove.In calcination process, material and thermal current contact area are small, and heat transfer efficiency is low, and calcining heat consumption is big, and processing time is long, gained production
Product or poor activity or activity should not be used in unshape refractory and building concrete industry very much by force.In calcining, when temperature is
At 500-600 DEG C, kaolinite（Al2O3·2SiO2·2H2O）Remove crystallization water generation metakaolinite（Al2O3·2SiO2）；Continue
The combustion reaction of carbon then occurs for heating；When temperature is 925-980 DEG C, metakaolinite takes place solid phase reaction and forms sial point
Spar（2Al2O3·3SiO2）；When calcining heat reaches 1000-1100 DEG C, sial spinelle is progressively to mullite（3Al2O3·
2SiO2）With amorphous Si O2Conversion.To meet the requirement of the industries such as ceramics, papermaking, coating, existing calcined kaolin products mainly chase after
Whiteness index is sought, is mostly calcined at 1000-1100 DEG C.After 600-700 DEG C of calcining, kaolin has maximum activity, warp
The alumina content highest that NaOH melts melt after leaching, after mixing cement or concrete, intensity is best, and condensation and frost resistance are good
Good, shrinkage performance is slightly worse but because of the soluble Al and SO in burning clay3Deng reaction, entringite is formed（3CaO•Al2O3•
3CaSO4•32H2O）, influence the sulphate-corrosion resistance energy of institute's prepared material.Similarly, in refractory concrete because burn clay in can
Dissolubility Al participates in the too fast water requirement for also influencing material shaping and making of reaction.Therefore, it is necessary to study a kind of new method for calcinating both to have protected
It holds and burns SiO in clay2Activity, reduce Al2O3Activity, and significantly improve calcining efficiency new method.
The content of the invention
In order to improve the thermal efficiency of calcining, the present invention intends, using flash calcine technology, completing to kaolin under fluidization
Preheating, calcining and the cooling of powder.Under fluidization form, kaolin powder is dispersed in single particle in thermal current, heat-exchange surface
Product is big, and solid phase heat transfer distances are short, therefore can complete to conduct heat in very short time, rapid to occur and complete reaction in-situ, realizes instantaneous
Heat transfer and instantaneous calcining.
A kind of method for calcinating of kaolin superfine powder, comprises the following steps：
Grinding：Kaolin is homogenized, is dried, grinding extremely<0.088mm；Calcining：Levigate kaolin is sent at flash calcining furnace
Reason；Cooling recycling.By X1, three cyclone preheaters, a fluidized calcinator, inverted U pipe, C1, C2, C3 of X2, X3 composition
The three-level cooling cyclone of composition and a cottrell and exhaust blower are formed；Enter stove raw material and sequentially enter X1, X2 and X3
Preheater is gone out furnace gases and is preheated step by step, and pre- hot material enters fluidized calcinator, is rapidly heated to 1150 DEG C -1350 DEG C, is protected
10s-20s is held, completes flash calcining；Then, the thermal current for being mingled with material after calcining enters separating barrel by inverted U pipeline,
Material is separated with gas in separating barrel；Material sequentially enters C1, C2, C3 cooling cyclone, is entered stove air and cooled down step by step；Most
Afterwards, cooled material enters airslide disintegrating mill, by levigate to≤0.044mm fine powders or the micro mist of≤0.010mm；Enter furnace gases
C1, C2, C3 cooling cyclone are sequentially entered, cools down material of coming out of the stove, and material of being come out of the stove preheats；Secondly, into calcining furnace, into
Row flash is calcined；Then, X1, X2 are sequentially entered, X3 cyclone preheaters are heated into stove material, and are entered stove material and cooled down；Most
Afterwards, go out furnace gases to handle through cottrell, then discharged through exhaust blower.
Soaking time at described 1150-1350 DEG C, by the pipeline of setting calcining furnace height and calcining furnace to cylinder（U
Type pipe）Length ensures.
The rapid cooling is completed by first to third level cooling cyclone cylinder.
One of described product is the kaolin fine powder after burning, and granularity≤0.044mm is partially larger than 90%, as superfine powder
For preparing the base portion in Al-Si Refractory Materials.Meanwhile as the admixture of cement.
The two of the product are the high alumina kaolinite micro mist after burning, and granularity≤0.010mm is partially larger than 90%, as micro mist
For preparing the base portion in Al-Si Refractory Materials, partly to replace silicon ash and alumina powder.Meanwhile as micro mist generation
It is used to prepare building concrete for part silicon ash.
Calcining furnace in the technological process, inverted U pipe, X1, X2, X3 cyclone preheaters can be directly using waste and old
The rotary kiln that small-sized cement factory discards can be used after simply transforming.
It is since kaolinite is layer structure, i.e., heavy along c-axis direction by " oxyhydrogen aluminum stone " octahedral sheet and tetrahedral si-o film
Multiple stacking forms, and interlayer exists without cation or hydrone.After dehydration, the metakaolinite of formation keeps kaolinic " false
As ", it is a kind of substance between amorphous state and crystalline state.Therefore, kaolin crystal Central Plains " oxyhydrogen aluminum stone " octahedral structure
By very havoc, but oxygen-octahedron structure relative completion.Therefore improved with calcining heat or calcination time extend, " hydrogen-oxygen aluminium
Stone " octahedral " illusion " will be reset, and is burnt the leaching rate of alumina of clay and will be greatly reduced, but " crystal grain " size formed
For structure cell grade, material still has very big activity.In warm-up phase, kaolinite completes dehydration, still to keep the non-of former kaolinite shape
Crystalline state or the very poor metakaolinite of crystallinity；In calcination stage, in-situ restructuring occurs for metakaolinite, forms short range similar to aluminium silicon tip
Spar but long-range unordered structure.Time for being heat-treated is very short in being calcined due to flash, kiln material at all without the sufficient time into
Row crystallization, therefore amorphous state and crystallinity are very poor, but the more complete substance of short range structure.Since the leaching rate of aluminium oxide is low, therefore
The sulphate-corrosion resistance energy that building concrete is configured by burning kaolin can be effectively improved.Since crystallinity is poor, weak with reference to power,
The kaolinite figure that flash is calcined out still has good chemism and excellent grindability, preferably mixed as refractory concrete and building
Active component in solidifying soil matrix matter uses.
Kaolin is homogenized, is dried, grinding, fluidization flash calcining and fine grinding, be made for unsetting fire proofed wood
The calcined kaolin fine powder or calcined kaolin micro mist of material matrix and the calcined kaolin micro mist for Concrete Industry, production
Product can be used for the industries such as ceramics, papermaking, rubber, coating, plastics, paint, cable, petrochemical industry, medicine as raw material or filler.
Specific embodiment
Embodiment 1
Select kaolinic chemical composition for：Al2O3=37.22%, SiO2=46.58%, Fe2O3=0.63%, TiO2=0.46%, CaO=
0.14%, MgO=0.06%, K2O=0.26%, Na2O=0.09%, Loss=14.46%.It is levigate after above-mentioned kaolinite smitham is dried
Extremely<0.088mm is re-fed into fluidization equipment and is calcined through 1150 DEG C × 30s, and calcination time calculating formula is " calcination time=fluidization
Calciner plant calcines the strip length/band mean flow rate ", by the materiel machining after calcining extremely≤calcined kaolin of 0.044mm surpasses
The micro mist of fine powder and≤0.010mm, for configuring glass furnace molten tin bath clay syphon.It matches and is：8-1mm flint clays 51.5%,<
1mm flint clays 19.8%,<0.088mm flint clays 10.1%,<0.088mm alumina base mullites 4.6%,<0.044mm alumina fine powders
4.4%,<0.010mm kaolinites micro mist 4.6%, silicon ash 2%, pure calcium aluminate cement 3%.
After water is added to be molded, 1 day flexural strength 4.3MPa meets manufacturing technique requirent；After 1250 DEG C × 8h is burnt, burning line
Change -0.71%, compressive resistance 87.3MPa, meet performance requirement.Experiment has reached part substitution alumina-silica raw material fine powder
With the purpose of substitution alumina powder.
Embodiment 2
Select kaolinic chemical composition for：Al2O3=37.22%, SiO2=46.58%, Fe2O3=0.63%, TiO2=0.46%, CaO=
0.14%, MgO=0.06%, K2O=0.26%, Na2O=0.09%, Loss=14.46%.It is levigate after above-mentioned kaolinite smitham is dried
Extremely<0.088mm is re-fed into fluidization equipment and is calcined through 1200 DEG C × 30s, and calcination time calculating formula is " calcination time=fluidization
Calciner plant calcines the strip length/band mean flow rate ", by the materiel machining after calcining extremely≤calcined kaolin of 0.044mm surpasses
The micro mist of fine powder and≤0.010mm, for configuring glass furnace molten tin bath clay syphon.It matches and is：8-1mm flint clays 51.5%,<
1mm flint clays 19.8%,<0.088mm flint clays 10.1%,<0.088mm alumina base mullites 4.6%,<0.044mm alumina fine powders
4.4%,<0.010mm kaolinites micro mist 4.6%, silicon ash 2%, pure calcium aluminate cement 3%.
After water is added to be molded, 1 day flexural strength 4.35MPa meets manufacturing technique requirent；After 1250 DEG C × 8h is burnt, burn till
Line changes -0.69%, compressive resistance 87.8MPa, meets performance requirement.It is thin that experiment has reached part substitution alumina-silica raw material
The purpose of powder and substitution alumina powder.
Embodiment 3
Select kaolinic chemical composition for：Al2O3=37.22%, SiO2=46.58%, Fe2O3=0.63%, TiO2=0.46%, CaO=
0.14%, MgO=0.06%, K2O=0.26%, Na2O=0.09%, Loss=14.46%.It is levigate after above-mentioned kaolinite smitham is dried
Extremely<0.088mm is re-fed into fluidization equipment and is calcined through 1250 DEG C × 20s, and calcination time calculating formula is " calcination time=fluidization
Calciner plant calcines the strip length/band mean flow rate ", by the materiel machining after calcining extremely≤calcined kaolin of 0.044mm surpasses
The micro mist of fine powder and≤0.010mm, for configuring glass furnace molten tin bath clay syphon.It matches and is：8-1mm flint clays 51.5%,<
1mm flint clays 19.8%,<0.088mm flint clays 10.1%,<0.088mm alumina base mullites 4.6%,<0.044mm alumina fine powders
4.4%,<0.010mm kaolinites micro mist 4.6%, silicon ash 2%, pure calcium aluminate cement 3%.
After water is added to be molded, 1 day flexural strength 4.41MPa meets manufacturing technique requirent；After 1250 DEG C × 8h is burnt, burn till
Line changes -0.63%, compressive resistance 87.85MPa, meets performance requirement.It is thin that experiment has reached part substitution alumina-silica raw material
The purpose of powder and substitution alumina powder.
Embodiment 4
Select kaolinic chemical composition for：Al2O3=37.22%, SiO2=46.58%, Fe2O3=0.63%, TiO2=0.46%, CaO=
0.14%, MgO=0.06%, K2O=0.26%, Na2O=0.09%, Loss=14.46%.It is levigate after above-mentioned kaolinite smitham is dried
Extremely<0.088mm is re-fed into fluidization equipment and is calcined through 1350 DEG C × 10s, and calcination time calculating formula is " calcination time=fluidization
Calciner plant calcines the strip length/band mean flow rate ", by the materiel machining after calcining extremely≤calcined kaolin of 0.044mm surpasses
The micro mist of fine powder and≤0.010mm, for configuring glass furnace molten tin bath clay syphon.It matches and is：8-1mm flint clays 51.5%,<
1mm flint clays 19.8%,<0.088mm flint clays 10.1%,<0.088mm alumina base mullites 4.6%,<0.044mm alumina fine powders
4.4%,<0.010mm kaolinites micro mist 4.6%, silicon ash 2%, pure calcium aluminate cement 3%.
After water is added to be molded, 1 day flexural strength 4.56MPa meets manufacturing technique requirent；After 1250 DEG C × 8h is burnt, burn till
Line changes -0.53%, compressive resistance 88.6MPa, meets performance requirement.It is thin that experiment has reached part substitution alumina-silica raw material
The purpose of powder and substitution alumina powder.
Embodiment 5
Select kaolinic chemical composition for：Al2O3=37.22%, SiO2=46.58%, Fe2O3=0.63%, TiO2=0.46%, CaO=
0.14%, MgO=0.06%, K2O=0.26%, Na2O=0.09%, Loss=14.46%.It is levigate after above-mentioned kaolinite smitham is dried
Extremely<0.088mm is re-fed into fluidization equipment and is calcined through 1250 DEG C × 10s, and calcination time calculating formula is " calcination time=fluidization
Calciner plant calcines the strip length/band mean flow rate ", by the materiel machining after calcining extremely≤calcined kaolin of 0.044mm surpasses
Fine powder.The performance of made calcined kaolin fine powder is judged with cement mortar strength test, when preparing standard specimen with 96% clinker
Add 4% gypsum, grind pure clinker cement, fineness control tails over 1%-4%, specific surface area 30m in 0.008mm square hole screens2Kg is left
It is right；85% standard specimen of comparative sample adds 15% calcined kaolin superfine powder to prepare；Tested according to standard conditions, acquired results with
“GB175-2007:Common portland cement " comparison is included in table 1：
Table 1 burns the comparison of clay cement mortar sample performance
As shown in Table 1, the cement mortar strength index of made standard specimen can meet highest ranking in GB175-2007 portland cements
62.5R requirement；Performance can also meet most high in GB175-2007 Portland cements after 15% burning clay of standard specimen admixture
The requirement of grade 52.5R.Therefore, it is made burning clay can be used for manufacture Portland cement, further it is levigate after can also be used for
Make concrete admixture.
Claims (4)
1. a kind of method for calcinating of kaolin superfine powder, comprises the following steps：Kaolin is homogenized, is dried, grinding extremely<
Levigate kaolin is sent into the processing of flash calcining furnace, cooling recycling by 0.088mm；Entire technological process by X1, X2, X3 composition
Three cyclone preheaters, a fluidized calcinator, inverted U pipe, the three-level cooling cyclone and an electricity of C1, C2, C3 composition
Dust-precipitator and exhaust blower are formed；Enter stove raw material and sequentially enter X1, X2 and X3 preheater, gone out furnace gases and preheated step by step；In advance
Hot material enters fluidized calcinator, completes flash calcining；Then, the thermal current for being mingled with material after calcining passes through inverted U pipeline
Into separating barrel, material is separated with gas in separating barrel, and material sequentially enters C1, C2, C3 cooling cyclone, is entered stove air
It cools down step by step；Finally, cooled material enters airslide disintegrating mill, by the product of levigate system；Enter furnace gases sequentially enter C1,
C2, C3 cooling cyclone cool down material of coming out of the stove, and material of being come out of the stove preheats；Secondly, into calcining furnace, flash calcining is carried out；
Then, X1, X2 are sequentially entered, X3 cyclone preheaters are heated into stove material, and are entered stove material and cooled down；Finally, furnace gases are gone out
It handles through cottrell, then is discharged through exhaust blower.
2. according to the method described in claim 1, it is characterized in that：Temperature is controlled at 1150 DEG C -1350 DEG C in the calcining furnace,
Pre- hot material keeps 10s-20s after entering calcining furnace, to complete flash calcining.
3. according to the method described in claim 1, it is characterized in that：In step（3）In, the material after the collection can be levigate
≤ 0.044mm fine powders are made.
4. according to the method described in claim 1, it is characterized in that：In step（3）In, the material after the collection can be levigate
≤ the micro mist of 0.010mm is made.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897542A (en) * | 2021-01-28 | 2021-06-04 | 天津水泥工业设计研究院有限公司 | Process and device for low-temperature rapid calcination modification of kaolin |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US3775040A (en) * | 1970-07-01 | 1973-11-27 | Clays Lovering Pochin & Co Ltd | Heat treatment of particulate materials |
| GB1352515A (en) * | 1970-04-15 | 1974-05-08 | English Clays Lovering Pochin | Separation of particulate materials |
| CN1600687A (en) * | 2003-09-28 | 2005-03-30 | 中国科学院过程工程研究所 | Rapid cycled fluidized calcining procedure for superfine kaolin and equipment |
| CN1915814A (en) * | 2006-09-12 | 2007-02-21 | 内蒙古蒙西高岭粉体股份有限公司 | Technique of fluidized instant calcinations of kaolin in coal series |
| CN101445248A (en) * | 2008-12-31 | 2009-06-03 | 开封奇明耐火材料有限公司 | Fluidized calcining technology of high-activity metakaolin |
| CN106568331A (en) * | 2016-10-19 | 2017-04-19 | 中冶焦耐(大连)工程技术有限公司 | Large suspension kiln and production process thereof |
-
2017
- 2017-12-12 CN CN201711317970.4A patent/CN108046282A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1352515A (en) * | 1970-04-15 | 1974-05-08 | English Clays Lovering Pochin | Separation of particulate materials |
| US3775040A (en) * | 1970-07-01 | 1973-11-27 | Clays Lovering Pochin & Co Ltd | Heat treatment of particulate materials |
| CN1600687A (en) * | 2003-09-28 | 2005-03-30 | 中国科学院过程工程研究所 | Rapid cycled fluidized calcining procedure for superfine kaolin and equipment |
| CN1915814A (en) * | 2006-09-12 | 2007-02-21 | 内蒙古蒙西高岭粉体股份有限公司 | Technique of fluidized instant calcinations of kaolin in coal series |
| CN101445248A (en) * | 2008-12-31 | 2009-06-03 | 开封奇明耐火材料有限公司 | Fluidized calcining technology of high-activity metakaolin |
| CN106568331A (en) * | 2016-10-19 | 2017-04-19 | 中冶焦耐(大连)工程技术有限公司 | Large suspension kiln and production process thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112897542A (en) * | 2021-01-28 | 2021-06-04 | 天津水泥工业设计研究院有限公司 | Process and device for low-temperature rapid calcination modification of kaolin |
| CN112897542B (en) * | 2021-01-28 | 2022-12-13 | 天津水泥工业设计研究院有限公司 | Process and device for low-temperature rapid calcination modification of kaolin |
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