CN113121260A - Preparation method of light high-strength building brick - Google Patents
Preparation method of light high-strength building brick Download PDFInfo
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- CN113121260A CN113121260A CN202110368054.3A CN202110368054A CN113121260A CN 113121260 A CN113121260 A CN 113121260A CN 202110368054 A CN202110368054 A CN 202110368054A CN 113121260 A CN113121260 A CN 113121260A
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- 239000011469 building brick Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 67
- 239000010431 corundum Substances 0.000 claims abstract description 67
- 239000010802 sludge Substances 0.000 claims abstract description 45
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000001816 cooling Methods 0.000 claims abstract description 30
- 238000001035 drying Methods 0.000 claims abstract description 24
- 238000003756 stirring Methods 0.000 claims abstract description 24
- 238000005245 sintering Methods 0.000 claims abstract description 21
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 19
- 150000001875 compounds Chemical class 0.000 claims abstract description 18
- 238000000227 grinding Methods 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims abstract description 10
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 10
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims abstract description 10
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 10
- 239000004088 foaming agent Substances 0.000 claims abstract description 10
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 8
- 230000001965 increasing effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 17
- 239000011449 brick Substances 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 description 11
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 10
- 238000010304 firing Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000006260 foam Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 239000003864 humus Substances 0.000 description 1
- 230000001795 light effect Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
- C04B33/132—Waste materials; Refuse; Residues
- C04B33/1321—Waste slurries, e.g. harbour sludge, industrial muds
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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
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- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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Abstract
The invention discloses a preparation method of a light high-strength building brick, which comprises the following steps: drying the foundation sludge for 1-2h at the drying temperature of 80-100 ℃, adding light corundum, light calcined magnesia and calcined alumina micro powder, uniformly mixing, and then uniformly grinding at 15-25kPa to obtain a sludge compound; adding carboxymethyl cellulose and sodium tripolyphosphate into water, uniformly mixing, adding a sludge compound, uniformly stirring, adding a foaming agent under a stirring state, and uniformly stirring to obtain a castable; and (3) uniformly casting the castable, drying and sintering to obtain the light high-strength building brick. The sintering operation is as follows: heating the blank obtained by baking from normal temperature to 300-400 ℃, and keeping the temperature t1h, cooling to 200 ℃ and 250 ℃, and keeping the temperature t2h; then the temperature is increased to 1200 ℃ and 1300 ℃, and the temperature is kept for t3h, cooling to 900 plus 1000 ℃, and keeping the temperature t4h; continuously heating to 1400 ℃ and 1450 ℃, and keeping the temperature t5h。
Description
Technical Field
The invention relates to the technical field of light building brick materials, in particular to a preparation method of a light high-strength building brick.
Background
At present, due to the influence of energy shortage and available energy price at home and abroad, the development of novel energy-saving light materials has great market demand at home and abroad. The development of environment-friendly light building brick materials and the preparation of low-density, high-strength and low-cost light building bricks have become the mainstream direction.
The silt is soft soil with a pore ratio of more than 1.5, is a modern sediment formed under the condition of participation of microorganisms in a slow water flow environment in a bay, a lake or a river, is rich in organic matters, low in mechanical strength, high in compressibility, poor in water permeability, easy to deform and uneven after loading, and easy to cause building settlement if silt exists in a foundation, so that the requirement of the foundation of a hydraulic building is not easily met.
At present, the accumulated stockpiling amount of the foundation sludge is nearly 30 hundred million tons, the stockpiling of the foundation sludge can cause a plurality of environmental hazards, the disposal of the foundation sludge is more and more concerned by the whole society, and the high added value utilization is less at present. The energy is saved, the method is one of important measures for keeping sustainable development economically, the foundation sludge is added into the building brick, the important measure for saving energy is realized, the prepared building brick cannot form uniform air holes, the weight is larger, the strength is low, the building brick is easy to crack, and the higher requirement is provided for the light building brick at present.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a preparation method of a light high-strength building brick.
The invention provides a preparation method of a light high-strength building brick, which comprises the following steps:
s1, drying the foundation sludge for 1-2 hours at the drying temperature of 80-100 ℃, adding light corundum, light calcined magnesia and calcined alumina micro powder, uniformly mixing, and then uniformly grinding under 15-25kPa to obtain a sludge compound;
s2, adding carboxymethyl cellulose and sodium tripolyphosphate into water, mixing uniformly, adding a sludge compound, stirring uniformly, adding a foaming agent under a stirring state, and stirring uniformly to obtain a castable;
and S3, uniformly casting the castable, naturally drying, baking for 1-2h at 50-80 ℃, and sintering to obtain the light high-strength building brick.
Preferably, in S1, the mass ratio of the foundation sludge, the light corundum, the light calcined magnesia and the calcined alumina micropowder is 40-80: 20-40: 10-30: 1-5.
Preferably, in S1, the foundation sludge has a water content of 40 to 50 wt% and a pore ratio of 1.5 to 2.5.
Preferably, in S1, the light corundum has a particle size of 6mm or less, specifically as follows: the light corundum with the grain diameter of less than or equal to 6mm and more than 3mm accounts for 20-30% by mass, the light corundum with the grain diameter of less than or equal to 3mm and more than 1mm accounts for 30-40% by mass, the light corundum with the grain diameter of less than or equal to 1mm and more than 0.5mm accounts for 10-15% by mass, and the balance is the light corundum with the grain diameter of less than or equal to 0.5 mm.
Preferably, in S1, the light corundum has a density of 1.55-1.65g/cm3(ii) a The volume of the through air holes in the light corundum accounts for 30-40% of the volume of the light corundum particles
Preferably, in S1, the particle size of the light-burned magnesia is less than 75 μm, and the particle size of the calcined alumina fine powder is less than 3 μm.
Preferably, in S2, the mass ratio of the carboxymethyl cellulose to the sodium tripolyphosphate to the sludge compound to the foaming agent is 1-5: 1-2: 80-100: 1-3.
Preferably, in S3, the sintering operation is as follows: heating the blank obtained by baking from normal temperature to 300-400 ℃, and keeping the temperature t1h, cooling to 200 ℃ and 250 ℃, and keeping the temperature t2h; then the temperature is increased to 1200 ℃ and 1300 ℃, and the temperature is kept for t3h, cooling to 900 plus 1000 ℃, and keeping the temperature t4h; continuously heating to 1400 ℃ and 1450 ℃, and keeping the temperature t5h; wherein t is more than or equal to 81+t2+t3+t4+t5≤12，t1+t3+t5≥t2+t4+3。
Preferably, in the sintering process of S3, the temperature rise speed in the temperature rise stage is 6-10 ℃/min.
Preferably, in the sintering process of S3, the cooling speed in the cooling stage is 1-2 ℃/min.
The technical effects of the invention are as follows:
because the foundation sludge contains a large amount of organic humus and has a very large natural pore ratio, the brick is directly calcined by a common process, organic carbon contained in the brick generates a large amount of bubbles in the firing process, the large amount of bubbles are gathered and convected in a blank body to form through air flow, and the mechanical property of the brick body is very poor;
the invention controls the sintering process, controls the growth speed of bubbles in the rapid heating process of the first, third and fifth stages, effectively reduces the aggregation of micro bubbles to form large bubbles, effectively enhances the mechanical property of products, controls the slow cooling process of the second and fourth stages, avoids bubbles from overflowing a blank body, effectively forms a porous structure, has light weight and excellent heat preservation performance of the blank body, greatly saves the cost compared with a common firing method, and has excellent mechanical property of fired products.
The invention further adds light corundum, light calcined magnesia, calcined alumina micro powder and foundation sludge for compounding, so that the light corundum, the light calcined magnesia, the calcined alumina micro powder and the foundation sludge are fully mixed at the molecular level, and the foundation sludge framework is prefabricated, thereby not only enhancing the strength of foundation sludge brick products, but also obviously improving the plasticity of green bodies, and having excellent brick forming performance. The light high-strength building brick obtained by the invention is detected as follows: the linear shrinkage after firing is less than 1 percent, the heat conductivity coefficient is 0.1-0.3W/(m.K), and the volume density is 0.5-0.8g/cm3The compressive strength is 21-25 MPa.
The large number of uniformly closed tiny air holes formed inside the building brick are beneficial to improving the light effect and the mechanical property of materials, and have the characteristics of resource saving, environmental protection and simple process.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A preparation method of a light high-strength building brick comprises the following steps:
s1, drying 40kg of foundation sludge for 2 hours at the drying temperature of 80 ℃, adding 40kg of light corundum, 10kg of light-burned magnesium oxide and 5kg of calcined alumina micro powder, uniformly mixing, and feeding the mixture into a grinding machine for uniform grinding at the grinding pressure of 15kPa to obtain a sludge compound;
wherein the water content of the foundation sludge is 50 wt%, and the porosity ratio is 1.5; the grain diameter of the light-burned magnesium oxide is less than 75 mu m; the particle size of the calcined alumina micro powder is less than 3 mu m;
the density of the light corundum is 1.64g/cm3(ii) a The volume of the through air holes in the light corundum accounts for 30 percent of the volume of the light corundum particles; the light corundum has the grain diameter of less than or equal to 6mm, and specifically comprises the following components: the mass percentage of the light corundum with the grain diameter of less than or equal to 6mm and more than 3mm is 30%, the mass percentage of the light corundum with the grain diameter of less than or equal to 3mm and more than 1mm is 30%, the mass percentage of the light corundum with the grain diameter of less than or equal to 1mm and more than 0.5mm is 15%, and the balance is the light corundum with the grain diameter of less than or equal to 0.5 mm;
s2, adding 5kg of carboxymethyl cellulose and 1kg of sodium tripolyphosphate into 30kg of water, uniformly mixing, adding 100kg of sludge compound, uniformly stirring, adding 1kg of foaming agent under a stirring state, and uniformly stirring to obtain a castable;
s3, uniformly casting the castable, naturally drying, baking for 1h at 80 ℃, and sintering to obtain the light high-strength building brick;
the sintering operation is as follows: heating the baked green body from normal temperature to 400 ℃, keeping the temperature for 3h at the heating speed of 6 ℃/min, cooling to 200 ℃, keeping the temperature for 1.5h at the cooling speed of 2 ℃/min; then heating to 1300 ℃, keeping the temperature for 3h at the heating speed of 6 ℃/min, cooling to 900 ℃, keeping the temperature for 1.5h at the cooling speed of 2 ℃/min; the temperature is continuously increased to 1450 ℃, the temperature increasing speed is 6 ℃/min, and the temperature is kept for 3 h.
Example 2
A preparation method of a light high-strength building brick comprises the following steps:
s1, drying 80kg of foundation sludge for 1h at the drying temperature of 100 ℃, adding 20kg of light corundum, 30kg of light-burned magnesium oxide and 1kg of calcined alumina micro powder, uniformly mixing, and feeding the mixture into a grinding machine for uniform grinding at the grinding pressure of 25kPa to obtain a sludge compound;
wherein the water content of the foundation sludge is 40 wt%, and the porosity ratio is 2.5; the grain diameter of the light-burned magnesium oxide is less than 75 mu m; the particle size of the calcined alumina micro powder is less than 3 mu m;
the density of the light corundum is 1.57g/cm3(ii) a The volume of the through air holes in the light corundum accounts for 40 percent of the volume of the light corundum particles; the light corundum has the grain diameter of less than or equal to 6mm, and specifically comprises the following components: the mass percentage of the light corundum with the grain diameter of less than or equal to 6mm and more than 3mm is 20%, the mass percentage of the light corundum with the grain diameter of less than or equal to 3mm and more than 1mm is 40%, the mass percentage of the light corundum with the grain diameter of less than or equal to 1mm and more than 0.5mm is 10%, and the balance is the light corundum with the grain diameter of less than or equal to 0.5 mm;
s2, adding 1kg of carboxymethyl cellulose and 2kg of sodium tripolyphosphate into 60kg of water, uniformly mixing, adding 80kg of sludge compound, uniformly stirring, adding 3kg of foaming agent under a stirring state, and uniformly stirring to obtain a castable;
s3, uniformly casting the castable, naturally drying, baking for 2 hours at 50 ℃, and sintering to obtain the light high-strength building brick;
the sintering operation is as follows: heating the baked green body from normal temperature to 300 ℃, keeping the temperature for 2h at the heating speed of 10 ℃/min, cooling to 250 ℃, keeping the temperature for 1.5h at the cooling speed of 1 ℃/min; then heating to 1200 ℃, keeping the temperature for 2h at the heating speed of 10 ℃/min, cooling to 1000 ℃, keeping the temperature for 1h at the cooling speed of 1 ℃/min; the temperature is continuously increased to 1400 ℃, the temperature increasing speed is 10 ℃/min, and the temperature is kept for 1.5 h.
Example 3
A preparation method of a light high-strength building brick comprises the following steps:
s1, drying 50kg of foundation sludge for 1.7h at the drying temperature of 85 ℃, adding 35kg of light corundum, 15kg of light-burned magnesium oxide and 4kg of calcined alumina micro powder, uniformly mixing, and feeding the mixture into a grinding machine for uniform grinding at the grinding pressure of 18kPa to obtain a sludge compound;
wherein the water content of the foundation sludge is 47 wt%, and the porosity ratio is 1.8; the grain diameter of the light-burned magnesium oxide is less than 75 mu m; the particle size of the calcined alumina micro powder is less than 3 mu m;
the density of the light corundum is 1.62g/cm3(ii) a The volume of the through air holes in the light corundum accounts for 33 percent of the volume of the light corundum particles; the light corundum has the grain diameter of less than or equal to 6mm, and specifically comprises the following components: the mass percentage of the light corundum with the grain diameter of less than or equal to 6mm and more than 3mm is 28 percent, the mass percentage of the light corundum with the grain diameter of less than or equal to 3mm and more than 1mm is 33 percent, the mass percentage of the light corundum with the grain diameter of less than or equal to 1mm and more than 0.5mm is 14 percent, and the balance is the light corundum with the grain diameter of less than or equal to 0.5 mm;
s2, adding 4kg of carboxymethyl cellulose and 1.3kg of sodium tripolyphosphate into 40kg of water, uniformly mixing, adding 95kg of sludge compound, uniformly stirring, adding 1.5kg of foaming agent under a stirring state, and uniformly stirring to obtain a castable;
s3, uniformly casting the castable, naturally drying, baking for 1.3h at 70 ℃, and sintering to obtain the light high-strength building brick;
the sintering operation is as follows: heating the baked green body from normal temperature to 370 ℃, keeping the temperature for 3h at the heating speed of 7 ℃/min, cooling to 240 ℃, keeping the temperature for 1h at the cooling speed of 1.3 ℃/min; then heating to 1280 ℃, keeping the temperature for 2h at the heating speed of 7 ℃/min, cooling to 970 ℃, keeping the temperature for 1.3 ℃/min at the cooling speed of 1.3 ℃/min, and keeping the temperature for 1 h; continuously heating to 1440 ℃, wherein the heating rate is 7 ℃/min, and keeping the temperature for 1 h.
Example 4
A preparation method of a light high-strength building brick comprises the following steps:
s1, drying 70kg of foundation sludge for 1.3h at the drying temperature of 95 ℃, adding 25kg of light corundum, 25kg of light-burned magnesium oxide and 2kg of calcined alumina micro powder, uniformly mixing, and feeding the mixture into a grinding machine for grinding uniformly under the grinding pressure of 22kPa to obtain a sludge compound;
wherein the water content of the foundation sludge is 43 wt%, and the porosity ratio is 2.1; the grain diameter of the light-burned magnesium oxide is less than 75 mu m; the particle size of the calcined alumina micro powder is less than 3 mu m;
density of light corundumIs 1.58g/cm3(ii) a The volume of the through air holes in the light corundum accounts for 37 percent of the volume of the light corundum particles; the light corundum has the grain diameter of less than or equal to 6mm, and specifically comprises the following components: the mass percentage of the light corundum with the grain diameter of less than or equal to 6mm and more than 3mm is 22%, the mass percentage of the light corundum with the grain diameter of less than or equal to 3mm and more than 1mm is 37%, the mass percentage of the light corundum with the grain diameter of less than or equal to 1mm and more than 0.5mm is 12%, and the balance is the light corundum with the grain diameter of less than or equal to 0.5 mm;
s2, adding 2kg of carboxymethyl cellulose and 1.7kg of sodium tripolyphosphate into 50kg of water, uniformly mixing, adding 85kg of sludge compound, uniformly stirring, adding 2.5kg of foaming agent under a stirring state, and uniformly stirring to obtain a castable;
s3, uniformly casting the castable, naturally drying, baking for 1.7h at 60 ℃, and sintering to obtain the light high-strength building brick;
the sintering operation is as follows: heating the baked green body from normal temperature to 330 ℃, keeping the temperature for 3h at the heating speed of 9 ℃/min, cooling to 220 ℃, keeping the temperature for 2h at the cooling speed of 1.7 ℃/min; then heating to 1220 ℃, keeping the temperature for 2h at the heating speed of 9 ℃/min, cooling to 930 ℃, keeping the temperature for 2h at the cooling speed of 1.7 ℃/min; and continuously heating to 1410 ℃, wherein the heating rate is 9 ℃/min, and keeping the temperature for 2 h.
Example 5
A preparation method of a light high-strength building brick comprises the following steps:
s1, drying 60kg of foundation sludge for 1.5h at the drying temperature of 90 ℃, adding 30kg of light corundum, 20kg of light-burned magnesium oxide and 3kg of calcined alumina micro powder, uniformly mixing, and feeding the mixture into a grinding machine for uniform grinding at the grinding pressure of 20kPa to obtain a sludge compound;
wherein the water content of the foundation sludge is 45 wt%, and the porosity ratio is 2.05; the grain diameter of the light-burned magnesium oxide is less than 75 mu m; the particle size of the calcined alumina micro powder is less than 3 mu m;
the density of the light corundum is 1.61g/cm3(ii) a The volume of the through air holes in the light corundum accounts for 35 percent of the volume of the light corundum particles; the light corundum has the grain diameter of less than or equal to 6mm, and specifically comprises the following components: the grain diameter is less than or equal to 6mm and more than 3The mass percent of the mm light corundum is 25%, the mass percent of the mm light corundum with the grain diameter of less than or equal to 3mm and more than 1mm is 35%, the mass percent of the mm light corundum with the grain diameter of less than or equal to 1mm and more than 0.5mm is 13%, and the balance is the weight percent of the mm light corundum with the grain diameter of less than or equal to 0.5 mm;
s2, adding 3kg of carboxymethyl cellulose and 1.5kg of sodium tripolyphosphate into 45kg of water, uniformly mixing, adding 90kg of sludge compound, uniformly stirring, adding 2kg of foaming agent under a stirring state, and uniformly stirring to obtain a castable;
s3, uniformly casting the castable, naturally drying, baking for 1.5h at 65 ℃, and sintering to obtain the light high-strength building brick;
the sintering operation is as follows: heating the baked green body from normal temperature to 350 ℃, keeping the temperature for 3h at the heating speed of 8 ℃/min, cooling to 230 ℃, keeping the temperature for 2h at the cooling speed of 1.5 ℃/min; then heating to 1250 ℃, keeping the temperature for 3h at the heating speed of 8 ℃/min, cooling to 950 ℃, keeping the temperature for 2h at the cooling speed of 1.5 ℃/min; and continuously heating to 1430 ℃ at the heating speed of 8 ℃/min and keeping the temperature for 2 h.
Comparative example
The commercially available foam brick for construction is adopted.
The light high-strength building bricks obtained in examples 3 to 5 and the commercially available building foam bricks used in the comparative examples were subjected to performance tests, and the test results are shown in the following table:
| detecting items | Unit of | Example 3 | Example 4 | Example 5 | Comparative example |
| Bulk density | g/cm3 | 0.51 | 0.72 | 0.85 | 1.42 |
| Coefficient of thermal conductivity | W/(m·K) | 0.12 | 0.16 | 0.19 | 0.38 |
| Compressive strength | MPa | 22 | 24 | 25 | 12 |
| Linear shrinkage after firing | ％ | 0.35 | 0.48 | 0.12 | 2.65 |
From the above table, it can be seen that: the light high-strength building brick obtained by the invention has the advantages of good mechanical property, high compressive strength, small specific gravity and high porosity, can easily resist conventional fire and is very suitable for heat preservation and bearing of external walls. Meanwhile, the invention takes the foundation sludge as the main body of the formula, well recycles waste resources, has simple firing process, saves energy, and has simple process and controllable conditions in the whole preparation process.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The preparation method of the light high-strength building brick is characterized by comprising the following steps:
s1, drying the foundation sludge for 1-2 hours at the drying temperature of 80-100 ℃, adding light corundum, light calcined magnesia and calcined alumina micro powder, uniformly mixing, and then uniformly grinding under 15-25kPa to obtain a sludge compound;
s2, adding carboxymethyl cellulose and sodium tripolyphosphate into water, mixing uniformly, adding a sludge compound, stirring uniformly, adding a foaming agent under a stirring state, and stirring uniformly to obtain a castable;
and S3, uniformly casting the castable, naturally drying, baking for 1-2h at 50-80 ℃, and sintering to obtain the light high-strength building brick.
2. The method for preparing the light-weight high-strength building brick according to claim 1, wherein in S1, the mass ratio of the foundation sludge, the light corundum, the light calcined magnesia and the calcined alumina micropowder is 40-80: 20-40: 10-30: 1-5.
3. The method of claim 1, wherein the moisture content of the foundation sludge is 40-50 wt% and the porosity is 1.5-2.5 in S1.
4. The method for preparing the light-weight high-strength building brick according to claim 1, wherein in S1, the grain size of the light-weight corundum is less than or equal to 6mm, and the method comprises the following specific steps: the light corundum with the grain diameter of less than or equal to 6mm and more than 3mm accounts for 20-30% by mass, the light corundum with the grain diameter of less than or equal to 3mm and more than 1mm accounts for 30-40% by mass, the light corundum with the grain diameter of less than or equal to 1mm and more than 0.5mm accounts for 10-15% by mass, and the balance is the light corundum with the grain diameter of less than or equal to 0.5 mm.
5. The method for preparing a lightweight high-strength architectural brick according to claim 1, wherein in S1, the lightweight corundum has a density of 1.55 to 1.65g/cm3(ii) a The volume of the through air holes in the light corundum accounts for 30-40% of the volume of the light corundum particles.
6. The method of claim 1, wherein in the step S1, the particle size of the light calcined magnesia is less than 75 μm, and the particle size of the calcined alumina fine powder is less than 3 μm.
7. The method for preparing a lightweight high-strength building brick according to claim 1, wherein in S2, the mass ratio of the carboxymethyl cellulose, the sodium tripolyphosphate, the sludge compound and the foaming agent is 1-5: 1-2: 80-100: 1-3.
8. The method of claim 1, wherein the sintering step in S3 is as follows:
heating the blank obtained by baking from normal temperature to 300-400 ℃, and keeping the temperature t1h, cooling to 200 ℃ and 250 ℃, and keeping the temperature t2h; then the temperature is increased to 1200 ℃ and 1300 ℃, and the temperature is kept for t3h, cooling to 900 plus 1000 ℃, and keeping the temperature t4h; continuously heating to 1400 ℃ and 1450 ℃, and keeping the temperature t5h；
Wherein t is more than or equal to 81+t2+t3+t4+t5Less than or equal to 12; and the heat preservation time t of the temperature rise stage1、t2、t3The following relationship is satisfied: t is t1+t3+t5≥t2+t4+3。
9. The method for preparing a lightweight high-strength building brick according to claim 8, wherein the temperature rise rate in the temperature rise stage is 6-10 ℃/min in the sintering process of S3.
10. The method for preparing a lightweight high-strength building brick according to claim 8, wherein the cooling rate in the cooling stage is 1-2 ℃/min in the sintering process of S3.
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| CN108727036A (en) * | 2018-06-13 | 2018-11-02 | 合肥欧克斯新型建材有限公司 | A kind of efficient energy-saving heat-preservation brick and preparation method thereof |
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| IT8421355A0 (en) * | 1983-07-21 | 1984-06-12 | Didier Werke Ag | PROCEDURE FOR PRODUCING A LIGHTWEIGHT FIREBRICK. |
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| CN101709001A (en) * | 2009-10-31 | 2010-05-19 | 华南理工大学 | Method for firing porous filtering ceramic tiles with ceramic polishing scrap |
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