CN104211426B - High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof - Google Patents
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof Download PDFInfo
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Abstract
High silicon mullite that the present invention relates to a kind of grass structure morph-genetic and preparation method thereof.Its technical scheme is: with the grass of 10 ~ 70wt% for template, with the Alumina gel of 30 ~ 90wt% for soaker, at normal pressure or 10
3~ 10
4flood 3 ~ 24h under Pa condition, stir; Again the grass being impregnated with Alumina gel is toasted 24 ~ 48h under 60 ~ 200 DEG C of conditions, then under the condition of 1100 ~ 1400 DEG C, be incubated 2 ~ 12h, obtain the high silicon mullite of grass structure morph-genetic.The present invention not only intactly saves the intrinsic structure of natural phant, and define mullite nano particle at the hole wall of natural phant and surface, not only refinement pore structure, and enhance its frame strength, high volume stability and acid-fast alkali-proof corrodibility, the intrinsic structure of this porous form, there is larger specific surface area, in the field such as high temperature insulating, support of the catalyst, there are larger potentiality.
Description
Technical field
The invention belongs to high silicon mullite technical field.High silicon mullite being specifically related to a kind of grass structure morph-genetic and preparation method thereof.
Background technology
Morph-genetic materials uses that nature is multi-level through the biology self of 1 years, the intrinsic structure of multidimensional, many structures, by artificial synthesis, change its structural constituent, prepare and both retain nature biotechnology fine structure, pass through selectively compound again, the artificial material giving characteristic and function.The mechanism of plant template is mainly introduced the synthesis of inorganic materials and the preparation of matrix material by it, be template with natural phant, prepare and various there is the controlled porous inorganic material of distinct plant structure feature, unique microstructure physical and mechanical properties.Crystal-mullite as stable existence unique in biphasic system itself has many excellent physical propertys, as low-expansion coefficient, low heat conduction, low creep, low-k, high heat shock resistance and hot strength etc., these characteristics of mullite make it be used widely in the various fields such as refractory materials, high-temperature structural material and optical material, have important industrial value.The porous mullite of controlled architecture is not only applied to the kiln refractory materials of heat resistant requirements, and be applied to rotproofness require various ceramic firing kiln furnitures as the field such as strainer, waste-gas cleaning catalytic carrier of saggar, refractory slab, metallic solution.
At present, Chinese scholars is attempting SiC, Al of possessing natural plant constitutional features with different filamentary material (cotton stem, coconut husk and timber etc.) for Template preparation
2o
3, Si/SiC/C, TiO
2, ZrO
2, TiN/C and SnO
2deng porous ceramics.As " a kind of preparation method of corn-cob structure morph-genetic ceramic-based composite material " (CN101838148A) patented technology, disclose with corn-cob structure be template or with corn-cob structure and presoma for composite shuttering, firing temperature is 1300-2000 DEG C, through vacuum carbothermal reduction reaction, prepare corn-cob structure morph-genetic ceramic-based composite material.And for example " a kind of eucalyptus loses state Fe
2o
3-Fe
3o
4the preparation method of Compound Heavy Metals sorbent material " (CN102258976A) patented technology, to disclose with eucalyptus be biological template, ammoniacal liquor is digestion agent, iron nitrate is precursor solution, obtains and lose state Fe by tree
2o
3-Fe
3o
4compound Heavy Metals sorbent material.The major defect of aforesaid method is embodied in: (1) carbonization natural phant is template or single utilizes its natural structure, could not to make full use of in natural phant other chemical compositions as SiO
2, indirectly cause waste; (2) complex manufacturing, needs multiple working procedure to complete; (3) goods pore is and copies plant structure hole, does not have a mutability.
Summary of the invention
The present invention is intended to overcome prior art defect, and object is to provide the preparation method of the high silicon mullite of the low and technique simple grass structure morph-genetic of a kind of cost.The high silicon mullite of obtained grass structure morph-genetic has the pore structure of refinement, and frame strength, high volume stability and acid-fast alkali-proof corrodibility are good.
For achieving the above object, the technical solution adopted in the present invention is: with the grass of 10 ~ 70wt% for template, with the Alumina gel of 30 ~ 90wt% for soaker, at normal pressure or 10
3~ 10
4flood 3 ~ 24h under Pa condition, stir; Again the grass being impregnated with Alumina gel is toasted 24 ~ 48h under 60 ~ 200 DEG C of conditions, then under the condition of 1100 ~ 1400 DEG C, be incubated 2 ~ 12h, obtain the high silicon mullite of grass structure morph-genetic.
Described grass is more than one in chaff, rice husk, nut-shell and wood chip, and particle diameter is less than 0.088mm.
The pH value of described Alumina gel is 2.4 ~ 3.8, and solid content is 0.5 ~ 5.0wt%.
Owing to adopting technique scheme, the present invention compared with prior art has following positively effect:
The present invention's main raw material used is the little grass of current utility value, and output is huge, abundance, and have high carbon content and low sulphur content, ash content is with SiO
2be main, cost is lower, and makes full use of the chemical composition SiO in natural phant
2, avoid wastage of material, turn waste into wealth.The present invention is by dipping, oven dry and firing process, and namely can be used as high temperature insulating raw material, support of the catalyst uses, production technique is simple; Simultaneously, the goods space of preparation is many, the exquisite complexity of structure, the not only intactly heredity intrinsic structure of natural phant in structure, also mullite nano particle is defined at the hole wall of natural phant and surface, enhance its frame strength, improve the homogeneity of structure and consistence of losing state structural ceramics matrix material, impart the function that it is new, make it have light weight, weakening, absorption, catalysis, high volume stability and acid-fast alkali-proof corrodible property, expand its use field, there is society and economic worth widely.Agriculture byproduct grass can being effectively utilized simultaneously, providing a utilization ways easily for increasing its economic worth.
Specific surface area 20 ~ the 34m of the high silicon mullite of the grass structure morph-genetic obtained by the present invention
2/ g, porosity is 50 ~ 84%, and mean pore size is 0.5 ~ 5.0 μm.
Therefore, the present invention has the low and simple feature of technique of cost, and the high silicon mullite of prepared grass structure morph-genetic is refinement pore structure not only, and frame strength, high volume stability and acid-fast alkali-proof corrodibility are good.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, not limiting the scope of the invention.
Particle diameter in chaff described in this embodiment, rice husk, nut-shell and wood chip is all less than 0.088mm.Repeat no more in embodiment.
embodiment 1
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Described preparation method is: with the grass of 10 ~ 20wt% for template, with the Alumina gel of 80 ~ 90wt% for soaker, floods 3 ~ 5h in atmospheric conditions, stirs; Again the grass being impregnated with Alumina gel is toasted 24 ~ 28h under 60 ~ 100 DEG C of conditions, then under the condition of 1350 ~ 1400 DEG C, be incubated 2 ~ 4h, obtain the high silicon mullite of grass structure morph-genetic.
In the present embodiment: the pH value of described Alumina gel is 3.4 ~ 3.8, and solid content is 4.0 ~ 5.0wt%; Described grass is chaff.
Specific surface area 20 ~ the 22m of the high silicon mullite stone of the grass structure morph-genetic obtained by the present embodiment 1
2/ g, porosity is 50 ~ 55%, and mean pore size is 0.5 ~ 1.0 μm.
embodiment 2
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Described preparation method is: with the grass of 20 ~ 30wt% for template, with the Alumina gel of 70 ~ 80wt% for soaker, floods 5 ~ 8h in atmospheric conditions, stirs; Again the grass being impregnated with Alumina gel is toasted 28 ~ 32h under 70 ~ 110 DEG C of conditions, then under the condition of 1300 ~ 1350 DEG C, be incubated 4 ~ 8h, obtain the high silicon mullite of grass structure morph-genetic.
In the present embodiment: the pH value of described Alumina gel is 3.2 ~ 3.4, and solid content is 3.0 ~ 4.0wt%; Described grass is chaff.
Specific surface area 22 ~ the 24m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 2
2/ g, porosity is 55 ~ 60%, and mean pore size is 1.0 ~ 1.5 μm.
embodiment 3
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Described preparation method is: with the grass of 30 ~ 40wt% for template, with the Alumina gel of 60 ~ 70wt% for soaker, floods 8 ~ 10h in atmospheric conditions, stirs; Again the grass being impregnated with Alumina gel is toasted 32 ~ 36h under 80 ~ 120 DEG C of conditions, then under the condition of 1250 ~ 1300 DEG C, be incubated 8 ~ 10h, obtain the high silicon mullite of grass structure morph-genetic.
In the present embodiment: the pH value of described Alumina gel is 3.0 ~ 3.2, and solid content is 2.5 ~ 3.0wt%; Described grass is rice husk.
Specific surface area 24 ~ the 26m of the high silicon mullite stone of the grass structure morph-genetic obtained by the present embodiment 3
2/ g, porosity is 60 ~ 65%, and mean pore size is 1.5 ~ 2.0 μm.
embodiment 4
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Described preparation method is: with the grass of 40 ~ 50wt% for template, with the Alumina gel of 50 ~ 60wt% for soaker, floods 10 ~ 12h in atmospheric conditions, stirs; Again the grass being impregnated with Alumina gel is toasted 36 ~ 40h under 90 ~ 140 DEG C of conditions, then under the condition of 1200 ~ 1250 DEG C, be incubated 10 ~ 12h, obtain the high silicon mullite of grass structure morph-genetic.
In the present embodiment: the pH value of described Alumina gel is 2.8 ~ 3.0, and solid content is 2.0 ~ 2.50wt%; Described grass is rice husk, nut-shell and wood chip.
Specific surface area 26 ~ the 28m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 4
2/ g, porosity is 65 ~ 70%, and mean pore size is 2.0 ~ 2.5 μm.
embodiment 5
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Described preparation method is: with the grass of 50 ~ 60wt% for template, with the Alumina gel of 40 ~ 50wt% for soaker, 1 × 10
3~ 2.5 × 10
3flood 12 ~ 15 under Pa condition, stir; Again the grass being impregnated with Alumina gel is toasted 40 ~ 44h under 100 ~ 150 DEG C of conditions, then under the condition of 1150 ~ 1200 DEG C, be incubated 6 ~ 12h, obtain the high silicon mullite of grass structure morph-genetic.
In the present embodiment: the pH value of described Alumina gel is 2.6 ~ 2.8, and solid content is 1.0 ~ 2.0wt%; Described grass is wood chip.
Specific surface area 28 ~ the 30m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 5
2/ g, porosity is 70 ~ 75%, and mean pore size is 2.5 ~ 3.0 μm.
embodiment 6
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Described preparation method is: with the grass of 60 ~ 70wt% for template, with the Alumina gel of 30 ~ 40wt% for soaker, 2.5 × 10
3~ 5.0 × 10
3flood 15 ~ 18h under Pa condition, stir; Again the grass being impregnated with Alumina gel is toasted 44 ~ 48h under 110 ~ 160 DEG C of conditions, then under the condition of 1100 ~ 1150 DEG C, be incubated 4 ~ 10h, obtain the high silicon mullite of grass structure morph-genetic.
In the present embodiment: the pH value of described Alumina gel is 2.4 ~ 2.6, and solid content is 0.5 ~ 1.0wt%; Described grass is chaff, nut-shell and wood chip.
Specific surface area 30 ~ the 32m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 6
2/ g, porosity is 75 ~ 80%, and mean pore size is 3.0 ~ 3.5 μm.
embodiment 7
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Described preparation method is: with the grass of 35 ~ 45wt% for template, with the Alumina gel of 55 ~ 65wt% for soaker, 5.0 × 10
3~ 7.5 × 10
3flood 18 ~ 21h under Pa condition, stir; Again the grass being impregnated with Alumina gel is toasted 32 ~ 40h under 120 ~ 180 DEG C of conditions, then under the condition of 1200 ~ 1300 DEG C, be incubated 4 ~ 6h, obtain the high silicon mullite of grass structure morph-genetic.
In the present embodiment: the pH value of described Alumina gel is 2.9 ~ 3.1, and solid content is 3.5 ~ 4.0wt%; Described grass is nut-shell.
Specific surface area 25 ~ the 27m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 7
2/ g, porosity is 62 ~ 68%, and mean pore size is 1.8 ~ 2.4 μm.
embodiment 8
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Described preparation method is: with the grass of 45 ~ 55wt% for template, with the Alumina gel of 45 ~ 55wt% for soaker, 7.5 × 10
3~ 1 × 10
4flood 21 ~ 24h under Pa condition, stir; Again the grass being impregnated with Alumina gel is toasted 40 ~ 48h under 130 ~ 200 DEG C of conditions, then under the condition of 1150 ~ 1250 DEG C, be incubated 6 ~ 10h, obtain the high silicon mullite of grass structure morph-genetic.
In the present embodiment: the pH value of described Alumina gel is 2.7 ~ 2.9, and solid content is 2.5 ~ 3.5wt%; Described grass is nut-shell and wood chip.
Specific surface area 26 ~ the 28m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 8
2/ g, porosity is 68 ~ 74%, and mean pore size is 2.2 ~ 2.8 μm.
embodiment 9
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Except following technical parameter, all the other are with embodiment 1.
In the present embodiment: described grass is chaff and rice husk.
Specific surface area 20 ~ the 23m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 9
2/ g, porosity is 50 ~ 56%, and mean pore size is 0.5 ~ 1.3 μm
.
embodiment 10
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Except following technical parameter, all the other are with embodiment 2.
In the present embodiment: described grass is chaff and wood chip.
Specific surface area 23 ~ the 25m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 10
2/ g, porosity is 56 ~ 60%, and mean pore size is 1.3 ~ 2.1 μm.
embodiment 11
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Except following technical parameter, all the other are with embodiment 3.
In the present embodiment: described grass is chaff and nut-shell.
Specific surface area 25 ~ the 28m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 11
2/ g, porosity is 60 ~ 66%, and mean pore size is 2.1 ~ 2.8 μm.
embodiment 12
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Except following technical parameter, all the other are with embodiment 4.
In the present embodiment: described grass is rice husk and wood chip.
Specific surface area 28 ~ the 30m of the high silicon mullite stone of the grass structure morph-genetic obtained by the present embodiment 12
2/ g, porosity is 66 ~ 72%, and mean pore size is 2.8 ~ 3.4 μm.
embodiment 13
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Except following technical parameter, all the other are with embodiment 5.
In the present embodiment: described grass is rice husk and nut-shell.
Specific surface area 29 ~ the 32m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 13
2/ g, porosity is 72 ~ 76%, and mean pore size is 3.4 ~ 4.2 μm.
embodiment 14
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Except following technical parameter, all the other are with embodiment 6.In the present embodiment: described grass is chaff, rice husk and wood chip.
Specific surface area 30 ~ the 33m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 14
2/ g, porosity is 76 ~ 84%, and mean pore size is 4.2 ~ 5.0 μm.
embodiment 15
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Except following technical parameter, all the other are with embodiment 7.
In the present embodiment: described grass is chaff, rice husk and nut-shell.
Specific surface area 30 ~ the 32m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 15
2/ g, porosity is 66 ~ 70%, and mean pore size is 2.0 ~ 2.6 μm.
embodiment 16
High silicon mullite of a kind of grass structure morph-genetic and preparation method thereof.Except following technical parameter, all the other are with embodiment 8.
In the present embodiment: described grass is chaff, rice husk, nut-shell and wood chip.
Specific surface area 31 ~ the 34m of the high silicon mullite of the grass structure morph-genetic obtained by the present embodiment 16
2/ g, porosity is 70 ~ 76%, and mean pore size is 2.4 ~ 3.0 μm.
This embodiment compared with prior art has following positively effect:
This embodiment main raw material used is the little grass of current utility value, and output is huge, abundance, and have high carbon content and low sulphur content, ash content is with SiO
2be main, cost is lower, and makes full use of the chemical composition SiO in natural phant
2, avoid wastage of material, turn waste into wealth.This embodiment is by dipping, oven dry and firing process, and namely can be used as high temperature insulating raw material, support of the catalyst uses, production technique is simple; Simultaneously, the goods space of preparation is many, the exquisite complexity of structure, the not only intactly heredity intrinsic structure of natural phant in structure, also mullite nano particle is defined at the hole wall of natural phant and surface, enhance its frame strength, improve the homogeneity of structure and consistence of losing state structural ceramics matrix material, impart the function that it is new, make it have light weight, weakening, absorption, catalysis, high volume stability and acid-fast alkali-proof corrodible property, expand its use field, there is society and economic worth widely.Agriculture byproduct grass can being effectively utilized simultaneously, providing a utilization ways easily for increasing its economic worth.
Specific surface area 20 ~ the 34m of the high silicon mullite of the grass structure morph-genetic obtained by this embodiment
2/ g, porosity is 50 ~ 84%, and mean pore size is 0.5 ~ 5.0 μm.
Therefore, this embodiment has the low and simple feature of technique of cost, and the high silicon mullite of prepared grass structure morph-genetic is refinement pore structure not only, and frame strength, high volume stability and acid-fast alkali-proof corrodibility are good.
Claims (2)
1. a preparation method for the high silicon mullite of grass structure morph-genetic, is characterized in that with the grass of 10 ~ 70wt% for template, with the Alumina gel of 30 ~ 90wt% for soaker, at normal pressure or 10
3~ 10
4flood 3 ~ 24h under Pa condition, stir; Again the grass being impregnated with Alumina gel is toasted 24 ~ 48h under 60 ~ 200 DEG C of conditions, then under the condition of 1100 ~ 1400 DEG C, be incubated 2 ~ 12h, obtain the high silicon mullite of grass structure morph-genetic;
Described grass is more than one in chaff and rice husk, and particle diameter is less than 0.088mm;
The pH value of described Alumina gel is 2.4 ~ 3.8, and solid content is 0.5 ~ 5.0wt%.
2. a high silicon mullite for grass structure morph-genetic, is characterized in that the high silicon mullite of described grass structure morph-genetic is the high silicon mullite of the grass structure morph-genetic prepared by preparation method of the high silicon mullite of grass structure morph-genetic according to claim 1.
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| CN104561636A (en) * | 2014-12-04 | 2015-04-29 | 浙江省地质矿产研究所 | Porous block-shaped magnetic metal prepared based on loofah sponge and preparation method thereof |
| CN106560234B (en) * | 2015-10-06 | 2019-10-25 | 河南工业大学 | A method of state, which is lost, using plant prepares charcoal-aero gel |
| CN106673678B (en) * | 2016-12-27 | 2020-02-14 | 武汉科技大学 | Mullite light heat-insulating brick and preparation method thereof |
| CN110105066A (en) * | 2019-06-06 | 2019-08-09 | 南通通州湾新材料科技有限公司 | The preparation method and its mobile phone backboard of wood texture ceramics surface structure part |
| CN114890810B (en) * | 2022-04-18 | 2023-04-28 | 焦作诺尔曼炉业有限公司 | Mullite lightweight aggregate with rice hull genetic structure and preparation method thereof |
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| CN101838148A (en) * | 2010-02-09 | 2010-09-22 | 西安工程大学 | Method for preparing corn-cob structure morph-genetic ceramic-based composite material |
| CN102258976A (en) * | 2011-05-20 | 2011-11-30 | 桂林理工大学 | Preparation method of eucalyptus biomorphic Fe2O3/Fe3O4 composite heavy metal adsorbent |
| CN103408297A (en) * | 2013-08-26 | 2013-11-27 | 武汉科技大学 | Calcium hexaluminate-mullite composite material and preparation method thereof |
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| CN1388086A (en) * | 2002-07-11 | 2003-01-01 | 上海交通大学 | Method of preparing ceramic with natural plant material |
| CN101838148A (en) * | 2010-02-09 | 2010-09-22 | 西安工程大学 | Method for preparing corn-cob structure morph-genetic ceramic-based composite material |
| CN102258976A (en) * | 2011-05-20 | 2011-11-30 | 桂林理工大学 | Preparation method of eucalyptus biomorphic Fe2O3/Fe3O4 composite heavy metal adsorbent |
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