CN117142877B - Preparation method of light silica brick and light silica brick obtained by preparation method - Google Patents
Preparation method of light silica brick and light silica brick obtained by preparation method Download PDFInfo
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- CN117142877B CN117142877B CN202311419784.7A CN202311419784A CN117142877B CN 117142877 B CN117142877 B CN 117142877B CN 202311419784 A CN202311419784 A CN 202311419784A CN 117142877 B CN117142877 B CN 117142877B
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- nitrate tetrahydrate
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 271
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 132
- 239000011449 brick Substances 0.000 title claims abstract description 129
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- ZHJGWYRLJUCMRT-UHFFFAOYSA-N 5-[6-[(4-methylpiperazin-1-yl)methyl]benzimidazol-1-yl]-3-[1-[2-(trifluoromethyl)phenyl]ethoxy]thiophene-2-carboxamide Chemical compound C=1C=CC=C(C(F)(F)F)C=1C(C)OC(=C(S1)C(N)=O)C=C1N(C1=C2)C=NC1=CC=C2CN1CCN(C)CC1 ZHJGWYRLJUCMRT-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 26
- 238000005245 sintering Methods 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 17
- 239000000843 powder Substances 0.000 claims description 28
- 239000002699 waste material Substances 0.000 claims description 24
- 239000000428 dust Substances 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 8
- 239000011230 binding agent Substances 0.000 claims description 7
- 239000007767 bonding agent Substances 0.000 claims description 7
- 239000004576 sand Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000002245 particle Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 abstract description 6
- 238000010304 firing Methods 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 4
- 238000009776 industrial production Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 13
- 238000004383 yellowing Methods 0.000 description 12
- 230000009286 beneficial effect Effects 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 239000008267 milk Substances 0.000 description 4
- 210000004080 milk Anatomy 0.000 description 4
- 235000013336 milk Nutrition 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000571 coke Substances 0.000 description 3
- 230000000295 complement effect Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000007580 dry-mixing Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 241001408630 Chloroclystis Species 0.000 description 1
- 229920001131 Pulp (paper) Polymers 0.000 description 1
- 229910002056 binary alloy Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000006071 cream Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- RAFRTSDUWORDLA-UHFFFAOYSA-N phenyl 3-chloropropanoate Chemical compound ClCCC(=O)OC1=CC=CC=C1 RAFRTSDUWORDLA-UHFFFAOYSA-N 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
- C04B38/0675—Vegetable refuse; Cellulosic materials, e.g. wood chips, cork, peat, paper
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/443—Nitrates or nitrites
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Abstract
The invention belongs to the field of light silica brick materials, and particularly relates to a preparation method of a light silica brick and the light silica brick obtained by the preparation method. The calcium nitrate tetrahydrate in the lightweight silica brick has the functions of the mineralizer and the pore-forming agent, and can be uniformly distributed and gradually decomposed in the high-temperature sintering process, so that the stress is absorbed, the heat conductivity is reduced, and meanwhile, the brick body is not damaged. The preparation method is simple, the raw materials are rich, the cost performance is excellent, the firing process is easy to control, the brick body cannot yellow, the method is suitable for industrial production of large-scale silica bricks, and the finished brick has higher strength.
Description
Technical Field
The invention belongs to the field of light silica brick materials, and particularly relates to a preparation method of a light silica brick and the light silica brick obtained by the preparation method.
Background
The light silica brick is also called siliceous heat insulating brick, and has silica content of 91wt% or higher and volume density of 1.2 g/cm 3 The following light refractory materials have the same refractoriness and load softening temperature as those of the componentsThe silicon brick is not much different. However, because of the many pores, the compressive strength, slag resistance, corrosion resistance and the like are not as good as those of ordinary silica bricks, but the thermal shock resistance is improved, and the characteristics of no shrinkage and the like are realized after long-term use, thus the ceramic material is widely applied to the design of light heat-insulating refractory material systems and kilns.
At present, the light silica bricks are generally prepared by adopting a mechanical pressure combustible method, and the method has the advantages of simple process, low cost and the like. The light-weight silica brick is produced by adding anthracite, coke dust, saw dust, shell powder, light polymer balls and other matters during compounding, and through molding and sintering. However, anthracite contains higher ash content, which is easy to deteriorate the firing performance of the product and generate phenomena of black cores, cracks, looseness, even chipping and the like; although the ash content of the coke dust is low, the quality and the source of the coke dust are unstable; the sawdust and the polymer light balls have elasticity, the elastic aftereffect of the blank body after the mechanical press molding is difficult to solve, and the cracking phenomenon is easy to generate. In addition, a significant problem with the mechanical compression flammable method is that the raw materials, particularly the combustibles, are difficult to disperse uniformly during the dry mixing process, so that the air holes of the finished brick after firing are distributed very unevenly, and the local concentration of air hole clusters is prominent. Thus, the yield is affected, and the stability of the quality of the silica bricks is also affected, so that the performance of the silica bricks is affected.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a preparation method of a light silica brick and the light silica brick obtained by the preparation method.
The technical scheme adopted by the invention is as follows:
the preparation method of the light silica brick comprises the following steps:
s1, baking calcium nitrate tetrahydrate until the calcium nitrate tetrahydrate is molten, and premixing and stirring the molten calcium nitrate tetrahydrate, silica fine powder and saw dust to obtain pug;
s2, mixing the pug of the S1 with aggregate, waste silica bricks and a binding agent, and pressing into green bricks;
s3, drying and sintering the green bricks to obtain finished products.
Preferably, the mass ratio of the calcium nitrate tetrahydrate to the silica fine powder and the saw dust is 1:1.5-5:0.05-0.5, preferably 1:1.5-4:0.1-0.4. According to the preferable scheme, wet mixing can be realized, and mud materials with uniform components can be prepared more easily.
In the S1, preferably, the total amount of raw materials is taken as a reference, the usage amount of calcium nitrate tetrahydrate is 10.1-20wt%, the usage amount of silica fine powder is 30-60wt%, and the usage amount of saw dust is 1-10wt%.
In the S2, preferably, the total amount of the raw materials is taken as a reference, the using amount of the aggregate accounts for 5-57.9 wt% and the using amount of the waste silica bricks accounts for 1-15 wt%; the consumption of the bonding agent is 0.5% -5% of the total amount of the raw materials.
In the preferable scheme of the ratio of the raw materials, the high-performance light silica brick can realize better grain composition and is more beneficial to the production of the high-performance light silica brick.
Preferably, the preparation method of the light silica brick further comprises the following steps: in S1, saw dust is soaked in water in advance for decay, and then the saw dust is premixed with fused calcium nitrate tetrahydrate and silica fine powder. According to the preferable scheme, sawdust can be prevented from floating in the pug, and the pug uniformity is improved.
More preferably, the soaking rot condition includes: the mass ratio of the sawdust to the water is 1: 0.1-0.5, the soaking time is 12-72h, and the soaking temperature is 10-40 ℃. According to the preferred scheme, the mass ratio of the sawdust to the water is proper, the soaking parameters are proper, the sawdust can be thoroughly decomposed, and the pugging of pugs is facilitated.
Wherein preferably, in S1, the conditions of premixing and stirring include: the stirring time is 1-10 min, and the stirring speed is 50-500 rpm.
Wherein preferably, in S2, the mixing conditions include: the mixing time is 1-30 min, and the mixing rotating speed is 50-500 rpm.
Wherein preferably the aggregate is one or more of silica or silica sand.
Wherein preferably, the waste silica bricks are produced by crushing produced silica brick residues.
Wherein preferably the binding agent is pulp waste or other species conventional in the art.
Wherein preferably, the granularity of the aggregate is less than or equal to 2.18 and mm, the granularity of the silica fine powder is less than or equal to 0.088mm, and the granularity of the waste silica bricks is less than or equal to 0.5 and mm.
Wherein preferably the particle size of the sawdust is less than or equal to 5 mm.
Wherein preferably, the drying and sintering process in S3 includes: and (3) naturally drying the green bricks for 12-48 hours until the residual moisture is less than 1.0 and wt percent, drying, then placing the green bricks into a tunnel kiln or a shuttle kiln, heating to 1450-1510 ℃, preserving heat for 24-48 hours, and sintering to obtain finished products. According to the preferable scheme, cracking of the silica bricks in the firing process can be avoided, and the physical properties of the finished bricks are improved.
The invention also provides a light silica brick which is prepared by the preparation method of the light silica brick. The light silica brick has excellent density, strength, stability and other performance.
The beneficial effects are that:
the lightweight silica brick containing calcium nitrate tetrahydrate produced by the technical scheme of the invention has the following advantages: (1) The molten liquid calcium nitrate tetrahydrate, the silica fine powder and the saw dust are premixed and stirred, so that the raw materials in the finished light silica brick are uniformly distributed, and the stability of each performance of the finished brick is improved; (2) The high-temperature decomposition of the calcium nitrate tetrahydrate is gradually carried out (the following reaction formulas 1-3), and when the calcium nitrate tetrahydrate is used as a mineralizer, compared with the lime milk adopted in the prior art, the calcium nitrate tetrahydrate can avoid the damage to a brick body due to the release of a large amount of gas at a certain temperature; (3) The total gas release amount of the calcium nitrate tetrahydrate is large at high temperature, so that the calcium nitrate tetrahydrate can also play a role of a pore-forming agent; (4) The brick body does not yellow when the calcareous mineralizer (namely calcium nitrate tetrahydrate) is singly used, and the melting point of the low melting phase in the brick is higher (CaO-SiO) 2 The minimum eutectic point 1430 ℃ of the binary system is beneficial to improving the high-temperature performance of the finished brick.
Ca(NO 3 ) 2 ·4H 2 O→Ca(NO 3 ) 2 Reaction 1
Ca(NO 3 ) 2 →Ca(NO 2 ) 2 Reaction 2
Ca(NO 2 ) 2 CaO equation 3.
Aiming at the defects and defects of the existing method for producing the light-weight silica bricks by adopting a mechanical pressure combustible method, the method has the following beneficial effects that calcium nitrate tetrahydrate is added into the raw materials for producing the light-weight silica bricks and matched with sawdust, silica fine powder and a specific premixing stirring step is adopted:
(1) The premixing and stirring of the liquid calcium nitrate tetrahydrate, the silica fine powder and the sawdust can realize the uniform distribution of the raw materials of the silica fine powder and the pore-forming agent mineralizer in the finished light silica brick, and the stability of each performance of the finished brick is improved; then mixing the mixture with aggregate, waste silica bricks and a bonding agent to ensure that the evenly distributed pug is fully and evenly mixed with the aggregate, the waste silica bricks and the bonding agent, thereby being beneficial to improving the performance and the yield of the burned bricks;
(2) The calcium nitrate tetrahydrate is gradually decomposed into calcium nitrite and calcium oxide in the firing process of the silica bricks, and the decomposition process is carried out in multiple steps, so that excessive pressure can not be generated in the bricks; the saw dust is matched, so that the damage to the brick structure can be avoided while uniform micropores are created, and the preparation of the high-performance uniform-pore light-weight silica bricks is facilitated;
(3) The volume shrinkage of the calcium nitrate tetrahydrate is large after the calcium nitrate tetrahydrate is decomposed at high temperature, so that the calcium nitrate tetrahydrate can also play a role of a pore-forming agent; by matching with the sawdust, uniform micropores (mainly generated by sawdust dehydration and burning loss) and gaps (mainly generated by calcium nitrate tetrahydrate dehydration and decomposition) can be formed at the contact position of the matrix part and the aggregate in the brick, thereby being beneficial to relieving the volume effect generated in the sintering process of the silica brick and improving the pore uniformity of the finished brick;
(4) The brick body of the calcium mineralizer is not yellowing when being singly used, and therefore, the low melting point in the brick is higher, and the produced silicon brick has high strength, good high-temperature volume stability, excellent high-temperature thermal shock resistance and excellent high-temperature creep property;
(5) The preparation method is simple, the raw materials are rich, the cost performance is excellent, the sintering process is easy to control, the method is suitable for the industrial production of the light-weight silica bricks, and the qualification rate is high.
Detailed Description
The invention solves the problem of uneven distribution of combustible materials caused by dry mixing when the lightweight silica bricks are produced by a mechanical pressure combustible method by utilizing the low melting point characteristic of the calcium nitrate tetrahydrate and utilizing the wet premixing of the baked liquid calcium nitrate tetrahydrate, the silica fine powder and the sawdust and matching with other steps. The calcium nitrate tetrahydrate in the lightweight silica brick has the functions of the mineralizer and the pore-forming agent, and can be uniformly distributed and gradually decomposed in the high-temperature sintering process, so that the stress is absorbed, the heat conductivity is reduced, and meanwhile, the brick body is not damaged. The preparation method is simple, the raw materials are rich, the cost performance is excellent, the firing process is easy to control, the brick body cannot yellow, the method is suitable for industrial production of large-scale silica bricks, and the finished brick has higher strength.
The invention is further illustrated below in conjunction with specific examples. In all examples, the content of each raw material is calculated by mass percent, the granularity of aggregate is less than or equal to 2.18 and mm, the granularity of silica fine powder is less than or equal to 0.088mm, the granularity of waste silica bricks is less than or equal to 0.5 and mm, and the granularity of sawdust is less than or equal to 5 and mm. The waste silica bricks are prepared by crushing produced silica brick residues, the binding agent is paper pulp waste liquid, the consumption standard of the binding agent is the total amount of a mixture composed of aggregate, silica fine powder, waste silica bricks, sawdust and calcium nitrate tetrahydrate (namely, the consumption of the binding agent is the total amount of the mixture), and the consumption standard of other raw materials is the consumption of the total amount of the mixture.
Example 1
The sawdust is soaked in water in advance for decay, and the mass ratio of the sawdust to the water is 1:0.2, soaking time is 24 hours, and soaking temperature is 27 ℃; then, the 19% calcium nitrate tetrahydrate is baked until being melted, 39% of silica fine powder and 2% of saw dust (namely, the saw dust after being soaked and rotten) are added and premixed and stirred, and the conditions of the premixed and stirred include: stirring for 6 min at stirring speed of 100 rpm to obtain pug; mixing the pug with 30% silica sand and 10% waste silica bricks, adding 2% pulp waste liquid bonding agent of the mixture, uniformly mixing for 20 min at a mixing speed of 150 rpm, and performing compression molding; naturally drying the green bricks for 36h until the residual moisture is less than 1.0 and wt%, and then placing the green bricks into a tunnel kiln at 1450 o And C, preserving heat for 30h, and sintering to obtain the light silica brick.
The obtained silica brick has no phenomena of black core, crack, loosening and even chipping, yellowing, etc., and has a volume density of 1.06 g/cm 3 The normal temperature compressive strength is 12.1 Mpa, the load softening temperature is 1578 ℃, the heat conductivity coefficient is 0.30W/(m.K) at 350 ℃, the permanent line change is +0.0% at 1550 ℃, the proportion of pores with the size of 50-300 mu m is 75%, and the product percent of pass is 93%.
Example 2
Reference example 1 was conducted except that 12% calcium nitrate tetrahydrate, 45% silica fine powder, 2% sawdust, 31% silica sand; drying for 24h at 1460 o And C, preserving heat for 36h, and sintering to obtain the light silica brick.
The obtained silica brick has no phenomena of black core, crack, loosening and even chipping, yellowing, etc., and has a volume density of 1.08 g/cm 3 The normal temperature compressive strength is 11.8 Mpa, the load softening temperature is 1585 ℃, the heat conductivity coefficient is 0.31W/(m.K) at 350 ℃, the permanent line change at 1550 ℃ is +0.0%, the 50-300 mu m Kong Zhanbi percent, and the product percent of pass is 92 percent.
Example 3
Reference example 1 was conducted except that 40% silica fine powder, 4% sawdust, 32% silica sand, 5% waste silica bricks; drying for 48 hours at 1460 o And C, preserving heat for 30 hours, and sintering to obtain the light silica brick.
The obtained silica brick has no phenomena of black core, crack, loosening and even chipping, yellowing, etc., and has a bulk density of 0.99 g/cm 3 The normal temperature compressive strength is 10.3 Mpa, the load softening temperature is 1595 ℃, the heat conductivity coefficient at 350 ℃ is 0.29W/(m.K), the permanent line change at 1550 ℃ is +0.0%, the 50-300 mu m Kong Zhanbi percent, and the product percent of pass is 94 percent.
Example 4
Reference example 1 was followed except that 37% silica fines, 4% sawdust, were dried for 36 hours at 1450 o And C, preserving heat for 24 hours, and sintering to obtain the light silica brick.
The obtained silica brick has no phenomena of black core, crack, loosening and even chipping, yellowing, etc., and has a volume density of 1.02 g/cm 3 The normal temperature compressive strength is 10.9 Mpa, the load softening temperature is 1609 ℃, the average heat conductivity coefficient at 350 ℃ is 0.30W/(m.K), the permanent line change at 1550 ℃ is +0.0%, the 50-300 mu m Kong Zhanbi percent, and the product percent of pass is 91 percent.
Example 5
With reference to example 1, except that 12% calcium nitrate tetrahydrate, 44% silica fine powder, 4% sawdust, 35% silica aggregate, 5% waste silica brick; drying for 36 hours at 1450 o And C, preserving heat for 36 hours, and sintering to obtain the light silica brick.
The obtained silica brick has no phenomena of black core, crack, loosening and even chipping, yellowing, etc., and has a volume density of 0.97 g/cm 3 The normal temperature compressive strength is 11.4 Mpa, the load softening temperature is 1611 ℃, the average heat conductivity coefficient at 350 ℃ is 0.28W/(m.K), the permanent line change at 1550 ℃ is +0.0%, the 50-300 mu m Kong Zhanbi 79%, and the product percent of pass is 93%.
Example 6
With reference to example 1, the difference is that the amount of sawdust was adjusted so that the mass ratio of calcium nitrate tetrahydrate to sawdust was 1:0.5, the other components are unchanged, and the usage amount of the silica aggregate is correspondingly adjusted to complement 100% of the mixture.
The obtained silica brick has no phenomena of black core, crack, loosening and even chipping, yellowing, etc., and has a bulk density of 0.91 g/cm 3 The normal temperature compressive strength is 9.1 Mpa, the load softening temperature is 1569 ℃, the heat conductivity coefficient is 0.31W/(m.K) at 350 ℃, the permanent line change is +0.0% at 1550 ℃, the product percent of pass is 90 percent, and the 50-300 mu m Kong Zhanbi percent of pass is realized.
Example 7
With reference to example 1, the difference is that the amount of sawdust was adjusted so that the mass ratio of calcium nitrate tetrahydrate to sawdust was 1:0.05, the other components are unchanged, and the usage amount of the silica aggregate is correspondingly adjusted to complement 100% of the mixture.
The obtained silica brick has no phenomena of black core, crack, loosening and even chipping, yellowing, etc., and has a volume density of 1.18 g/cm 3 The normal temperature compressive strength is 12.4 Mpa, the load softening temperature is 1595 ℃, the heat conductivity coefficient at 350 ℃ is 0.37W/(m.K), the permanent line change at 1550 ℃ is +0.0%, the 50-300 mu m Kong Zhanbi percent, and the product percent of pass is 89 percent.
Example 8
With reference to example 1, the difference is that the amount of silica fine powder is adjusted so that the mass ratio of calcium nitrate tetrahydrate to silica fine powder is 1:5, the other components are unchanged, and the usage amount of the silica aggregate is correspondingly adjusted to complement 100% of the mixture.
The obtained silica brick has no phenomena of black core, crack, loosening and even chipping, yellowing, etc., and has a volume density of 1.16 g/cm 3 The normal temperature compressive strength is 11.8 Mpa, the load softening temperature is 1572 ℃, the heat conductivity coefficient is 0.38W/(m.K) at 350 ℃, the permanent line change at 1550 ℃ is +0.0%, the 50-300 mu m Kong Zhanbi%, and the product percent of pass is 88%.
Example 9
With reference to example 1, the difference is that the sawdust is not decomposed in advance, but the powder sawdust is directly mixed.
The obtained silica brick has no phenomena of black core, crack, loosening and even chipping, yellowing, etc., and has a volume density of 1.08 g/cm 3 The normal temperature compressive strength is 10.1 Mpa, the load softening temperature is 1562 ℃, the heat conductivity coefficient is 0.37W/(m.K) at 350 ℃, the permanent line change is +0.0% at 1550 ℃, the product percent of pass is 86 percent, and the 50-300 mu m Kong Zhanbi percent.
Comparative example 1
The mineralizing agent lime cream is adopted to prepare the silica brick by matching with the conventional preparation method, and the concrete steps are as follows:
firstly, mixing 35.0. 35.0 wt% of silica sand, 45% of silica fine powder, 10wt% of waste silica bricks, 2% of saw dust and 8.0 wt% of lime milk, adding 1.5 wt% of pulp waste liquid bonding agent of the mixture, uniformly mixing, and pressing for molding; the green bricks are naturally dried for 24 hours and then are put into a tunnel kiln at 1450 o And C, preserving heat for 36h, and sintering to obtain the light silica brick.
The obtained silica brick has a volume density of 1.15 g/cm 3 The normal temperature compressive strength is 5.6 Mpa, the load softening temperature is 1539 ℃, the heat conductivity coefficient is 0.38W/(m.K) at 350 ℃, the permanent line change is +0.2% at 1550 ℃, the product yield is 80 percent and the 50-300 mu m Kong Zhanbi percent.
It can be seen that comparative example 1, which uses a conventional formulation and method, has low room temperature compressive strength and load softening temperature, high thermal conductivity and poor uniformity of pore size distribution, compared with example 1.
Comparative example 2
The method adopts the combination of mineralizer lime milk and iron scales to prepare the silica brick by matching with a conventional preparation method, and specifically comprises the following steps:
mixing 38.0 wt% of silica sand, 45% of silica fine powder, 10wt% of waste silica bricks, 2% of saw dust, 4.0 wt% of lime milk and 1% of iron scale, adding 1.5 wt% of pulp waste liquid bonding agent of the mixture, uniformly mixing, and pressing for forming; the green bricks are naturally dried for 36 hours and then are put into a tunnel kiln at 1450 o And C, preserving heat for 24 hours, and sintering to obtain the light silica brick.
The obtained silica brick has a bulk density of 1.16 g/cm 3 The normal temperature compressive strength is 5.3 Mpa, the load softening temperature is 1510 ℃, the heat conductivity coefficient is 0.38W/(m.K) at 350 ℃, the permanent line change at 1550 ℃ is +0.1%, the 50-300 mu m Kong Zhanbi%, and the product percent of pass is 82%.
It can be seen that comparative example 2, which uses a conventional formulation and method, has low room temperature compressive strength and load softening temperature, high thermal conductivity and poor uniformity of pore size distribution, compared with example 1.
Comparative example 3
With reference to example 1, the difference is that the calcium nitrate tetrahydrate is not baked to melt, but the subsequent premixing and the like steps are performed using the calcium nitrate tetrahydrate powder.
The obtained silica brick has no phenomena of black core, crack, loosening and even chipping, yellowing, etc., and has a volume density of 1.06 g/cm 3 The normal temperature compressive strength is 10.9 Mpa, the load softening temperature is 1566 ℃, the heat conductivity coefficient is 0.33W/(m.K) at 350 ℃, the permanent line change is +0.2% at 1550 ℃, the 50-300 mu m Kong Zhanbi percent, and the product percent of pass is 82 percent.
Comparative example 4
With reference to example 1, the process was carried out except that the baking and premixing were not carried out, but all the raw materials were directly kneaded, and the subsequent pressing was carried out.
The obtained silica brick has no phenomena of black core, loosening, even chipping, yellowing, etc., and part of brick body has cracks, and the volume density is 1.06 g/cm after detection 3 The normal temperature compressive strength is 10.1 Mpa, the load softening temperature is 1567 ℃, the heat conductivity coefficient is 0.36W/(m.K) at 350 ℃, the permanent line change at 1550 ℃ is +0.3%, the 50-300 mu m Kong Zhanbi%, and the product percent of pass is 75%.
Claims (8)
1. The preparation method of the light silica brick is characterized by comprising the following steps:
s1, baking calcium nitrate tetrahydrate until the calcium nitrate tetrahydrate is molten, and premixing and stirring the molten calcium nitrate tetrahydrate, silica fine powder and saw dust to obtain pug; the mass ratio of the calcium nitrate tetrahydrate to the silica fine powder to the saw dust is 1:1.5-5:0.05-0.5; in S1, taking the total amount of raw materials as a reference, the dosage of calcium nitrate tetrahydrate accounts for 10.1-20wt%, the dosage of silica fine powder accounts for 30-50wt%, and the dosage of saw dust accounts for 1-10wt%;
s2, mixing the pug of the S1 with aggregate, waste silica bricks and a binding agent, and pressing into green bricks; in S2, the total amount of raw materials is taken as a reference, the using amount of aggregate is 5-57.9 wt%, and the using amount of waste silica bricks is 1-15 wt%; the consumption of the bonding agent is 0.5% -5% of the total amount of the raw materials;
s3, drying and sintering the green bricks to obtain finished products.
2. The method for producing a lightweight silica brick according to claim 1, further comprising: in S1, saw dust is soaked in water in advance for decay, and then the saw dust is premixed with fused calcium nitrate tetrahydrate and silica fine powder.
3. The method for producing a lightweight silica brick according to claim 2, wherein the soaking rotting conditions include: the mass ratio of the sawdust to the water is 1: 0.1-0.5, soaking time is 12-72h, and soaking temperature is 10-40 ℃.
4. The method for producing a lightweight silica brick according to claim 1, wherein in S1, the conditions of premixing and stirring include: stirring for 1-10 min at 50-500 rpm;
in S2, the mixing conditions include: the mixing time is 1-30 min, and the mixing rotating speed is 50-500 rpm.
5. The method for producing a lightweight silica brick according to claim 1, wherein the aggregate is one or more of silica or silica sand, the waste silica brick is produced by crushing a produced silica brick residue, and the binder is pulp waste liquid.
6. The method for producing a lightweight silica brick according to claim 1, wherein the aggregate has a particle size of 2.18. 2.18 mm or less, the silica fine powder has a particle size of 0.088mm or less, the waste silica brick has a particle size of 0.5 mm or less, and the sawdust has a particle size of 5 mm or less.
7. The method for producing a lightweight silica brick according to claim 1, wherein the drying and sintering process in S3 comprises: and (3) naturally drying the green bricks for 12-48 hours until the residual moisture is less than 1.0 and wt percent, drying, then placing the green bricks into a tunnel kiln or a shuttle kiln, heating to 1450-1510 ℃, preserving heat for 24-48 hours, and sintering to obtain finished products.
8. A lightweight silica brick produced by the method for producing a lightweight silica brick as claimed in any one of claims 1 to 7.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962056A (en) * | 2006-11-02 | 2007-05-16 | 吉林大学 | Catalyst for removing oil fume and preparation method thereof |
| CN107162500A (en) * | 2017-05-16 | 2017-09-15 | 安徽省华银茶油有限公司 | A kind of cold-proof freeze proof concrete aerated brick and preparation method thereof |
| CN113982083A (en) * | 2021-09-09 | 2022-01-28 | 宏岳塑胶集团股份有限公司 | Preparation method of sound-proof and heat-proof type foamed cement plastic pipe fitting |
| WO2022105557A1 (en) * | 2020-11-20 | 2022-05-27 | 中国石油天然气集团有限公司 | High-strength portland cement slurry for ultra-high-temperature cementing, preparation method therefor and application thereof |
| CN115536409A (en) * | 2022-10-24 | 2022-12-30 | 中冶检测认证有限公司 | Silica brick added with calcium nitrate tetrahydrate and preparation method thereof |
| CN115893998A (en) * | 2022-11-18 | 2023-04-04 | 广西蒙娜丽莎新材料有限公司 | Preparation method of luminous antibacterial ceramic |
| CN116535175A (en) * | 2023-05-18 | 2023-08-04 | 江苏绿和环境科技有限公司 | Recycled brick aggregate water permeable brick and preparation method thereof |
-
2023
- 2023-10-30 CN CN202311419784.7A patent/CN117142877B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1962056A (en) * | 2006-11-02 | 2007-05-16 | 吉林大学 | Catalyst for removing oil fume and preparation method thereof |
| CN107162500A (en) * | 2017-05-16 | 2017-09-15 | 安徽省华银茶油有限公司 | A kind of cold-proof freeze proof concrete aerated brick and preparation method thereof |
| WO2022105557A1 (en) * | 2020-11-20 | 2022-05-27 | 中国石油天然气集团有限公司 | High-strength portland cement slurry for ultra-high-temperature cementing, preparation method therefor and application thereof |
| CN113982083A (en) * | 2021-09-09 | 2022-01-28 | 宏岳塑胶集团股份有限公司 | Preparation method of sound-proof and heat-proof type foamed cement plastic pipe fitting |
| CN115536409A (en) * | 2022-10-24 | 2022-12-30 | 中冶检测认证有限公司 | Silica brick added with calcium nitrate tetrahydrate and preparation method thereof |
| CN115893998A (en) * | 2022-11-18 | 2023-04-04 | 广西蒙娜丽莎新材料有限公司 | Preparation method of luminous antibacterial ceramic |
| CN116535175A (en) * | 2023-05-18 | 2023-08-04 | 江苏绿和环境科技有限公司 | Recycled brick aggregate water permeable brick and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 李红霞.《耐火材料手册 第2版》.北京：冶金工业出版社,2021,第609-610页. * |
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