CN103951372A - High-strength fire-resistant thermal insulation material - Google Patents
High-strength fire-resistant thermal insulation material Download PDFInfo
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- CN103951372A CN103951372A CN201410155179.8A CN201410155179A CN103951372A CN 103951372 A CN103951372 A CN 103951372A CN 201410155179 A CN201410155179 A CN 201410155179A CN 103951372 A CN103951372 A CN 103951372A
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Abstract
The invention discloses a high-strength fire-resistant thermal insulation material. A preparation method of the high-strength fire-resistant thermal insulation material comprises the following steps: preparing a shaped product with the required size by using expanded vermiculite, clay, refractory cement and dextrin as initial materials and adding a waterproof agent and a binding agent in a mechanical pressing forming manner, wherein a nano-modification organic silicon rubber solution is used as the waterproof agent, and the binding agent is an inorganic binding agent, drying, carrying out heat preservation, and baking at a high temperature, thus obtaining the high-strength fire-resistant thermal insulation material. The high-strength fire-resistant thermal insulation material has the advantages of good structure and volume stability, high strength, low cost, simple process, convenience for construction and baking, environmental protection, safety and the like.
Description
Technical field
The present invention relates to a kind of lagging material, relate in particular to a kind of take expanded vermiculite, clay, refractory cements, the high-strength refractory lagging material of dextrin as just expecting.
Background technology
At industrial circle, every higher than kiln body and body of heater under normal temperature environment, especially high temperature kiln, high-temperature smelting pot, in order to prevent the loss of heat, adopt lagging material at body of heater or kiln body.Using the upper part alumina-silicate ceramic fibre plates that adopt or tapetum fibrosum as the lagging material between kiln refractory lining and iron-clad for current 800 ℃ more, yet fibrous lagging material is generally loose and porous structure, water-absorbent is unfavorable for by force casting and constructing, at 800～1000 ℃ of life-time service, can there is crystallization in addition, make the fiber efflorescence that becomes fragile, cause thermal insulation layer slump attenuation, can cause structural distortion in kiln lining, loosening, fall brick etc., as electrolyzer thermal insulation layer, easily cause leaking aluminium phenomenon, as rotary kiln, ladle, the refractory lining of tundish and torpedo car etc. and the thermal insulation layer between iron-clad easily cause that middle and later periods surface temperature raises, iron-clad distortion, affect furnace lining heat retaining property and resistance to overturning.
Energy prices are day by day high, and traditional energy supply shortage is energy-saving and cost-reducing, and green production is imperative.The most urgent current task is that exploitation thermal conductivity is low, intensity is high, high volume stability is excellent, the heat-insulating heat-preserving material of 1000 ℃ of not efflorescence of life-time service distortion.
Summary of the invention
The object of the invention is in order to solve the problems of the technologies described above the deficiency of existence, provide that a kind of structure and volume stability are good, intensity is high, cost is low, technique is simple, constructability and baker, and the high-strength refractory lagging material of Environmental Safety and and preparation method.
The technical solution adopted in the present invention is, with expanded vermiculite, clay, refractory cements, dextrin for just expecting, additional water-resisting agent and bonding agent; Adopt mechanical pressing mode to prepare the molded article of desired size, after drying, insulation, and high temperature bakes, and obtains this high-strength refractory lagging material.
The parts by weight of the expanded vermiculite in just expecting, clay, refractory cements, dextrin are: expanded vermiculite accounts for the per-cent 80～95% of the gross weight of just expecting, clay accounts for the per-cent 2～15% of the gross weight of just expecting, refractory cements accounts for the per-cent 2～5% of the gross weight of just expecting, and dextrin accounts for the per-cent 0～2% of the gross weight of just expecting; The per-cent that water-resisting agent accounts for the gross weight of just expecting is 3～6%; The per-cent that bonding agent accounts for the gross weight of just expecting is 25～30%;
Wherein the granularity of expanded vermiculite is between 0.1～2mm, and granularity accounts for 75～95% of expanded vermiculite gross weight being less than or equal to 1mm and being greater than between 0.1mm, and granularity is less than or equal to 2mm and is greater than and between 1mm, accounts for 5～25% of expanded vermiculite gross weight;
Wherein the granularity < 0.044mm of well as clay fines, deducts the chemical composition Al after igloss
2o
335～48%, Al
2o
3+ SiO
2>=97%, basic oxide R
2o≤0.6%.
The Al of refractory cements wherein
2o
3> 50%, granularity < 0.088mm.
Wherein dextrin is industrial yellow starch gum powder, granularity < 0.1mm.
What wherein water-resisting agent was used is nano modified organosilicon rubber solutions.
Wherein bonding agent is inorganic bonding agent, a kind of in aluminium dihydrogen phosphate, phosphoric acid, or the combination solution of two kinds.
Preparation method of the present invention is:
The preparation of step 1, expanded vermiculite: flaky vermiculite is slowly heated to 800 ℃ from normal temperature, drops into rapidly in the process furnace that is heated to 1000 ℃ high-temperature roasting expanded, obtain expanded vermiculite material through broken selection by winnowing grading system after expanded;
The preparation of step 2, matrix: the powder mix matrix that clay, refractory cements, dextrin are obtained in mixing equipment mixing by above-mentioned umber for 30-60 minute;
Step 3, expanded vermiculite material prepared by step 1 add bonding agent to stir, and after stirring, add water-resisting agent, stir wetting; Add again the prepared powder mix of step 2 to mix;
Step 4, by conventional mechanical pressing mode, prepare the molded article of various desired sizes, through 100～110 ℃, after dry 24～36 hours, at 230～300 ℃, high temperature bakes 10～12 hours, obtains this high-strength refractory lagging material.
Wherein the vermiculite in step 1 obtains through broken selection by winnowing grading system after expanded, granularity 1～2mm, loose bulk density < 0.2g/cm
3; Granularity 0.1～1mm, loose bulk density < 0.3g/cm
3.
In step 1, the thermal technology of vermiculite puffing has been selected first preheating, then the mode of rapid heating, and this is because if with the type of heating that is warmed up at a slow speed 1000 ℃, and vermiculite is that interlayer division is come, and expands less, thereby has extended the expansion time; If when vermiculite is heated rapidly to 1000 ℃, under high temperature direct effect, first vermiculite upper layer expands becomes thermal insulating layer on surface, cause the thermal resistance of whole particle to increase, conduct heat slack-off, the dewatering speed of granule interior diminishes, and cause reducing expanded efficiency, make expanded time lengthening; Therefore the thermal technology of the present invention's vermiculite puffing used, makes the expanded multiple of vermiculite can improve 30%, expanded time shorten 50%.
The resulting expanded vermiculite of this thermal technology has unique lamellar structure and a large amount of tiny pores, is being subject to form layers sheet IPN when molded to inlay network structure, thereby is having very little thermal conductivity, to conducting heat, has larger iris action; Make end article there is compressive strength high, the advantages such as thermal and insulating performance is good, and change very little along with temperature increases progressively thermal conductivity, can be in use temperature more than 1000 ℃ high temperature the intensity of the heat insulation and preservation effect and the uralite that are similar to ceramic beaverboard is provided consistently, having again certain toughness can relief of thermal stress; Expanded vermiculite has been used different proportionings in the present invention in addition, the distribution of the accumulation of discontinuous sized particles and continuous sized particles is mated particle with accumulation and density control, make article construction highly stable, at high temperature life-time service product of the present invention can not be out of shape as ceramic beaverboard generation crystallization in efflorescence, thereby guarantee that the heat retaining property of furnace lining and one-piece construction are stable, can effectively extend converter life, improve operating environment around, guaranteed normal production, reduce maintenance rate, thereby reduced production cost.
The present invention has used nano modified organosilicon rubber solutions as water-resisting agent, and nano modified organosilicon rubber solutions has unique water-repellancy, snappiness, and globality films continuously, fine and close in seam; Stable performance, high temperature resistant, low temperature resistant, super weather-proof, anti-aging; It also has active nanoparticle energy rapid permeability and enters basic unit inside, be cross-linked into dimensional network structure body, make goods there is good thixotropy and the stability of dispersion, therefore nano modified organosilicon rubber solutions, as material of construction, is usually used in some buildingss such as building roof floor, toilet, parking lot; And the present invention innovates a nano modified organosilicon rubber solutions and is used in this flame-proof thermal insulation material formula, take full advantage of these advantages such as hydrophobic nature of nano modified organosilicon rubber solutions, goods of the present invention are difficult for by water-wet, facilitate construction and the baker of mould material; Therefore nano modified organosilicon rubber solutions has played vital effect in the present invention;
The present invention has adopted phosphoric acid salt high temperature adhesives, can fully effectively utilize the small-particle raw ore that output is large, cost is low, has improved utilization ratio and the use temperature of granular raw ore.
The present invention also takes full advantage of the solidification of reacting of refractory cements and bonding agent, only needs to adopt conventional hydropress drawing method plastic, and integrated artistic is simple, is easy to produce in enormous quantities, can significantly reduce production cost.
In addition, the present invention is not detrimental to health containing any asbestos and ceramic fiber etc. and the material of contaminate environment, healthy and safe, cleaner production.
Performance index of the present invention are: volume density 1.1～1.5g/cm
3, compressive strength 15～35MPa, thermal conductivity 0.17～0.25W/mk, 1000 ℃ * 24h hour line shrinking percentage≤2%, 24 hours soaked rear compressive strength>=12MPa.
Therefore, the present invention can be widely used in refractory lining and the lining of the insulation between iron-clad of electrolyzer, rotary kiln, ladle, tundish and torpedo car etc., can greatly reduce iron-clad temperature, reduces iron-clad distortion, extends the iron-clad life-span, improves operating environment around.
Embodiment
Following examples describe the present invention in detail.
Embodiment 1:
The preparation of step 1, expanded vermiculite: flaky vermiculite is slowly heated to 800 ℃ from normal temperature, drops into rapidly in the process furnace that is heated to 1000 ℃ high-temperature roasting expanded, obtain expanded vermiculite material through broken selection by winnowing grading system after expanded;
The preparation of step 2, matrix: clay 2%, refractory cements 2%, dextrin 1%, is placed on mixing equipment and mixes the powder mix matrix obtaining for 60 minutes;
Step 3, expanded vermiculite material prepared by step 1 choose 95%, then add and account for the bonding agent that the per-cent of the gross weight of just expecting is 30% and stir, and after stirring, adding the per-cent that accounts for the gross weight of just expecting is 6% water-resisting agent, stirs wetting; Add again the prepared powder mix mixing and stirring of step 2;
Step 4, by conventional mechanical pressing mode, prepare the molded article of various desired sizes, through 110 ℃, after dry 36 hours, at 300 ℃, high temperature bakes 12 hours, obtains this high-strength refractory lagging material.
The volume density of the high-strength refractory lagging material that the present embodiment obtains is 1.14g/cm
3, cold crushing strength is 17MPa, thermal conductivity (1000 ℃ of hot-face temperatures) is 0.165W/mk, 1.52%, 24 hour soaked rear compressive strength 12.5MPa of 1000 ℃ * 24h hour line shrinking percentage.
Embodiment 2:
The preparation of step 1, expanded vermiculite: flaky vermiculite is slowly heated to 800 ℃ from normal temperature, drops into rapidly in the process furnace that is heated to 1000 ℃ high-temperature roasting expanded, obtain expanded vermiculite material through broken selection by winnowing grading system after expanded;
The preparation of step 2, matrix: clay 5%, refractory cements 3%, dextrin 2%, is placed on mixing equipment and mixes the powder mix matrix obtaining for 50 minutes;
Step 3, expanded vermiculite material prepared by step 1 choose 90%, then add and account for the bonding agent that the per-cent of the gross weight of just expecting is 28% and stir, and after stirring, adding the per-cent that accounts for the gross weight of just expecting is 5% water-resisting agent, stirs wetting; Add again the prepared powder mix mixing and stirring of step 2;
Step 4, by conventional mechanical pressing mode, prepare the molded article of various desired sizes, through 100 ℃, after dry 36 hours, at 280 ℃, high temperature bakes 10 hours, obtains this high-strength refractory lagging material.
The volume density of the high-strength refractory lagging material that the present embodiment obtains is 1.26g/cm
3, cold crushing strength is 20MPa, thermal conductivity (1000 ℃ of hot-face temperatures) is 0.169W/mk, 1.45%, 24 hour soaked rear compressive strength 14.6MPa of 1000 ℃ * 24h hour line shrinking percentage.
Embodiment 3:
The preparation of step 1, expanded vermiculite: flaky vermiculite is slowly heated to 800 ℃ from normal temperature, drops into rapidly in the process furnace that is heated to 1000 ℃ high-temperature roasting expanded, obtain expanded vermiculite material through broken selection by winnowing grading system after expanded;
The preparation of step 2, matrix: clay 8%, refractory cements 5%, dextrin 2%, is placed on mixing equipment and mixes the powder mix matrix obtaining for 40 minutes;
Step 3, expanded vermiculite material prepared by step 1 choose 85%, then add and account for the bonding agent that the per-cent of the gross weight of just expecting is 28% and stir, and after stirring, adding the per-cent that accounts for the gross weight of just expecting is 5% water-resisting agent, stirs wetting; Add again the prepared powder mix mixing and stirring of step 2;
Step 4, by conventional mechanical pressing mode, prepare the molded article of various desired sizes, through 105 ℃, after dry 30 hours, at 250 ℃, high temperature bakes 10 hours, obtains this high-strength refractory lagging material.
The volume density of the high-strength refractory lagging material that the present embodiment obtains is 1.38g/cm
3, cold crushing strength is 25MPa, thermal conductivity (1000 ℃ of hot-face temperatures) is 0.219W/mk, 1.15%, 24 hour soaked rear compressive strength 18MPa of 1000 ℃ * 24h hour line shrinking percentage.
Embodiment 4:
The preparation of step 1, expanded vermiculite: flaky vermiculite is slowly heated to 800 ℃ from normal temperature, drops into rapidly in the process furnace that is heated to 1000 ℃ high-temperature roasting expanded, obtain expanded vermiculite material through broken selection by winnowing grading system after expanded;
The preparation of step 2, matrix: clay 15%, refractory cements 5%, dextrin 0%, is placed on mixing equipment and mixes the powder mix matrix obtaining for 30 minutes;
Step 3, expanded vermiculite material prepared by step 1 choose 80%, then add and account for the bonding agent that the per-cent of the gross weight of just expecting is 25% and stir, and after stirring, adding the per-cent that accounts for the gross weight of just expecting is 3% water-resisting agent, stirs wetting; Add again the prepared powder mix mixing and stirring of step 2;
Step 4, by conventional mechanical pressing mode, prepare the molded article of various desired sizes, through 110 ℃, after dry 24 hours, at 230 ℃, high temperature bakes 12 hours, obtains this high-strength refractory lagging material.
The volume density of the high-strength refractory lagging material that the present embodiment obtains is 1.49g/cm
3, cold crushing strength is 35MPa, thermal conductivity (1000 ℃ of hot-face temperatures) is 0.248W/mk, 0.96%, 24 hour soaked rear compressive strength 20MPa of 1000 ℃ * 24h hour line shrinking percentage.
Claims (9)
1. a high-strength refractory lagging material, is characterized in that: with expanded vermiculite, clay, refractory cements, dextrin for just expecting, additional water-resisting agent and bonding agent; The parts by weight of the expanded vermiculite in just expecting, clay, refractory cements, dextrin are: expanded vermiculite accounts for the per-cent 80～95% of the gross weight of just expecting, clay accounts for the per-cent 2～15% of the gross weight of just expecting, refractory cements accounts for the per-cent 2～5% of the gross weight of just expecting, and dextrin accounts for the per-cent 0～2% of the gross weight of just expecting; The per-cent that water-resisting agent accounts for the gross weight of just expecting is 3～6%; The per-cent that bonding agent accounts for the gross weight of just expecting is 25～30%.
2. a kind of high-strength refractory lagging material according to claim 1, it is characterized in that: the granularity of expanded vermiculite is between 0.1～2mm, granularity accounts for 75～95% of expanded vermiculite gross weight being less than or equal to 1mm and being greater than between 0.1mm, granularity is less than or equal to 2mm and is greater than and between 1mm, accounts for 5～25% of expanded vermiculite gross weight.
3. a kind of high-strength refractory lagging material according to claim 1, is characterized in that: the granularity < 0.044mm of well as clay fines, the chemical composition Al after deduction igloss
2o
335～48%, Al
2o
3+ SiO
2>=97%, basic oxide R
2o≤0.6%.
4. a kind of high-strength refractory lagging material according to claim 1, is characterized in that: the Al of refractory cements
2o
3> 50%, granularity < 0.088mm.
5. a kind of high-strength refractory lagging material according to claim 1, is characterized in that: dextrin is industrial yellow starch gum powder, granularity < 0.1mm.
6. a kind of high-strength refractory lagging material according to claim 1, is characterized in that: what water-resisting agent was used is nano modified organosilicon rubber solutions.
7. a kind of high-strength refractory lagging material according to claim 1, is characterized in that: bonding agent is inorganic bonding agent, a kind of in aluminium dihydrogen phosphate, phosphoric acid, or the combination solution of two kinds.
8. the preparation method of a kind of high-strength refractory lagging material according to claim 1, it is characterized in that: the preparation of step 1, expanded vermiculite: flaky vermiculite is slowly heated to 800 ℃ from normal temperature, drop into rapidly in the process furnace that is heated to 1000 ℃ high-temperature roasting expanded, through broken selection by winnowing grading system, obtain expanded vermiculite material after expanded;
The preparation of step 2, matrix: the powder mix matrix that clay, refractory cements, dextrin are obtained in mixing equipment mixing by above-mentioned umber for 30-60 minute;
Step 3, expanded vermiculite material prepared by step 1 add bonding agent to stir, and after stirring, add water-resisting agent, stir wetting; Add again the prepared powder mix of step 2 to mix;
Step 4, by conventional mechanical pressing mode, prepare the molded article of various desired sizes, through 100～110 ℃, after dry 24～36 hours, at 230～300 ℃, high temperature bakes 10～12 hours, obtains this high-strength refractory lagging material.
9. the preparation method of a kind of high-strength refractory lagging material according to claim 8, is characterized in that: after vermiculite in step 1 is expanded, through broken selection by winnowing grading system, obtain granularity 1～2mm, loose bulk density < 0.2g/cm
3; Granularity 0.1～1mm, loose bulk density < 0.3g/cm
3.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108026725A (en) * | 2015-09-23 | 2018-05-11 | 韩国维尔美株式会社 | Ultrathin architectural decoration vermiculite board |
| CN114621016A (en) * | 2022-03-18 | 2022-06-14 | 安徽碳鑫科技有限公司 | Preparation process of refractory heat-insulating material |
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| CN108026725A (en) * | 2015-09-23 | 2018-05-11 | 韩国维尔美株式会社 | Ultrathin architectural decoration vermiculite board |
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