CN103204691B - Low-heat conductance silicon corundum brick material and silicon corundum composite brick made of same - Google Patents
Low-heat conductance silicon corundum brick material and silicon corundum composite brick made of same Download PDFInfo
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Abstract
The invention relates to a low-heat conductance silicon corundum brick material and a silicon corundum composite brick made of the same, and belongs to the technical field of refractory materials. The low-heat conductance silicon corundum brick material comprises a liquid bonding agent and the following solid raw materials in parts by weight: 38-45 parts of bauxite chamotte granules with the content of Al2O3 of more than or equal to 87 percent by weight, 15-20 parts of silicon carbide powder with the content of SiC of more than or equal to 90 percent by weight and the content of free carbon of not less than 5 percent, 8-13 parts of electric smelting white corundum powder with the Al2O3 content of more than or equal to 99 percent by weight, 6-8 parts of andalusite powder with the Al2O3 content of more than or equal to 55 percent by weight, 3-5 parts of SiO2 ultramicro powder with SiO2 content of more than or equal to 95 percent by weight, 0.5-1 part of monatomic silicon ultramicro powder, 0.5-1 part of monatomic aluminum ultramicro powder, 3-5 parts of floating beads with the Al2O3 content of more than or equal to 30 percent by weight and the SiO2 content of more than or equal to 50 percent by weight and 8-10 parts of soft refractory clay with the Al2O3 content of more than or equal to 30 percent by weight. The silicon corundum composite brick made of the low-heat conductance silicon corundum brick material is obtained by carrying out double-surface mechanical pressing and burning on two materials, namely the low-heat conductance silicon corundum brick material and a heavy brick material. When the silicon corundum composite brick provided by the invention is used for building the transitional zone of a cement rotary kiln, the mean temperature of a cylinder body is low and is only 186 DEG C.
Description
Technical field
The invention belongs to technical field of refractory materials, be specifically related to a kind of low thermal conductance silicon corundum brick material, also relate to the silicon Corundum composite brick of being made by this brick material simultaneously.
Background technology
Along with the continuous renewal of technology of producing cement, cement manufacture plant, increasingly to maximization, energy-saving future development, increases output, improves quality, saves energy and reduce the cost, reduces costs the key that becomes enterprise's increase benefit.
At present, rotary kiln is with refractory brick still taking spinel brick and siliceous mullite brick as main flow, but this two classes brick all exists the defect that thermal conductivity is high, thermal waste is large.For this reason, some producers and R&D institution have carried out a large amount of research work, and have released some heavy, lightweight combines composite bricks.But cannot meet service requirements because lightweight working lining structural strength is too low, this type of composite brick does not obtain and promotes on a large scale, causes in industry so far still taking heavy brick as main.Taking the rotary kiln of the 10000t/d of conch group as example, its front transitional zone is used spinel brick, and what clinkering zone used is magnesia chrome brick.Due to the thermal conductivity large (>=2.7W/mK) of spinel brick and magnesia chrome brick, make kiln cylinder body outside wall temperature higher (greatly about 380 DEG C of left and right, can reach 420 DEG C when high temperature).Cylinder body outer wall excess Temperature can make kiln cylinder body heat radiation increase on the one hand, thereby has strengthened heat consumption of clinker, has increased grog unit cost; On the other hand, cylindrical shell is overheated also has a great potential safety hazard: increased the damage probability of mechanical means, accelerated barrel distortion, and barrel distortion has accelerated the physical disturbance of liner, consequently fallen brick, stop kiln, affected the operation factor of cement rotary kiln.Visible, if can use low thermal conductance, combined strength bination is high, heat-proof quality is good refractory lining at these key positions, not only can reduce the temperature of transitional zone position cylindrical shell, reduce heat lost by radiation, reduce energy consumption, also be conducive to the maintenance of equipment, improve operation rate simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of low thermal conductance silicon corundum brick material, the comprehensive silicon corundum brick taking this brick material as light layer raw material is also provided simultaneously.
Based on above-mentioned purpose, the present invention has taked following technical scheme: low thermal conductance silicon corundum brick material, is made up of the solid material of liquid bonding agent and following weight parts: Al
2o
338～45 parts of bauxitic clay grog particles, SiC content>=90wt% and the free carbon content of content>=87wt% is not less than 5% 15～20 parts of carborundum powders, Al
2o
38～13 parts, the fused white corundum powder of content>=99wt%, Al
2o
36～8 parts, the andaluzite powder of content>=55wt%, SiO
2the SiO of content>=95wt%
23～5 parts of super-fine powder, 0.5～1 part of elemental silicon super-fine powder, 0.5～1 part of pure aluminum super-fine powder, Al
2o
3content>=30wt% and SiO
2content>=50wt% floats 3～5 parts, pearl, Al
2o
38～10 parts of the soft flame-proof clay powders of content>=30wt%.
Described liquid bonding agent is the lignosulfite of proportion 1.15～1.25g/mL, and its consumption is 4～4.5% of described solid material gross weight.
The particle diameter of described bauxitic clay grog particle is 2～4mm; Described carborundum powder is crossed 200 mesh sieves, and fused white corundum powder is crossed 300 mesh sieves, and andaluzite powder is crossed 200 mesh sieves, and soft flame-proof clay powder is crossed 200 mesh sieves; Described SiO
2particle diameter≤0.3 μ the m of super-fine powder, the particle diameter≤5 μ m of elemental silicon, pure aluminum super-fine powder, described in float bead footpath≤1mm.
The silicon Corundum composite brick of being made up of described low thermal conductance silicon corundum brick material, this composite brick is molded and fire and form through Double-plate machine by described low thermal conductance silicon corundum brick material and heavy brick material two sections of material.
The weight of described heavy brick material consists of: Al
2o
340～50 parts of the bauxitic clay particles of content>=85wt%, Al
2o
35～15 parts of the emergies of content>=90wt%, Al
2o
312～15 parts of the carborundum powders of 12～15 parts of content>=90wt% lapis amiridiss, SiC>=97wt%, Al
2o
35～15 parts, the bonding clay powder of content>=35wt%, 3～5 parts of additional liquid bonding agents, 3～10 parts of function admixtures.
In described heavy brick material, the particle diameter of bauxitic clay particle is 2～4mm, emergy particle diameter≤1mm, and lapis amiridis is crossed 325 mesh sieves, and carborundum powder is crossed 200 mesh sieves, and bonding clay powder is crossed 200 mesh sieves.
Additional liquid bonding agent in described heavy brick material is industrial wooden sulfonate solution, methocel solution or phosphate dihydrogen aluminum solution; Described function admixture is Al
2o
3aquamaine stone flour or the ZrO of>=58wt%
2the zirconia powder of>=99wt%.
Described composite brick makes via following method: (1) mixing low thermal conductance silicon corundum brick material; (2) mixing heavy brick material; (3) moulding: material chamber is divided into two portions in proportion with dividing plate mould, filling low thermal conductance silicon corundum brick material and heavy brick material respectively, wherein the volume of low thermal conductance silicon corundum brick material is no more than 50% of composite brick cumulative volume; After extracting dividing plate out, adopt Double-plate machine molded, forming pressure is not less than 100MPa; (4) burn till: the base substrate after moulding is placed at 80～150 DEG C and is dried 24 hours, and loading of kiln, fires 20～24 hours at 1480 DEG C ± 10 DEG C, then cooling with kiln.
The mixing step of described low thermal conductance silicon corundum brick material is: by carborundum powder, fused white corundum powder, andaluzite powder, SiO
2super-fine powder, elemental silicon super-fine powder, pure aluminum super-fine powder and soft flame-proof clay powder add pulvis mixing pan successively, and mixed grind 10～15 minutes, for subsequent use continuously; By bauxitic clay grog particle with float after pearl mixes and insert particle mixing pan, add liquid bonding agent mixed grind 2～3 minutes, then the pulvis mixing is joined in operating particle mixing pan, more abundant mixed grind 5～10 minutes.
The mixing step of described heavy brick material is: lapis amiridis, carborundum powder, function admixture and bonding clay powder is placed in to pulvis mixing pan and fully mixes 5～10 minutes, and for subsequent use; Bauxitic clay particle, emergy and additional liquid bonding agent are placed in to particle mixing pan mixed grind 2～3 minutes; Pour the pulvis mixing in the operating particle mixing pan abundant 10-15 minute of mixing.
In low thermal conductance silicon corundum brick material provided by the invention, the SiO adding
2after super-fine powder is fired, can, at the inner nanometer micropore that forms of goods, effectively stop the propagation of heat energy; Andaluzite powder is the mechanism of utilizing the effect of andaluzite microdilatancy and floating the fired volumetric shrinkage of pearl with floating adding of pearl, increase the void content of goods, further reduce goods thermal conduction capability, also mutually receive separately the volumetric shrinkage causing and the stress that expands and bring under high temperature simultaneously; SiC adds the high-temperature behavior that not only can effectively improve goods, has also effectively stopped thermal radiation simultaneously, has further strengthened the heat-insulation and heat-preservation ability of goods; Simple substance Si and simple substance Al add according to weight ratio 1:1, and the uncombined carbon in energy and SiC forms respectively β-SiC and Al
4c
3, can effectively increase product strength.Test-results shows, low thermal conductance silicon corundum brick material products provided by the invention can be ensureing that product is withstand voltage, obviously reduce the thermal conductivity of product on the use basis of wear resisting property, contributes to enterprise to realize energy-saving and cost-reducing target, and its economic and social benefit is remarkable.Silicon Corundum composite brick performance brilliance taking it as light layer material and yield rate high (can reach 99%), the masonry cement rotary kiln transition belt of using, cylindrical shell medial temperature is only 186 DEG C, far below existing spinel brick and siliceous mullite brick on the market.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
embodiment 1
low thermal conductance silicon corundum brick material,solid material by liquid bonding agent lignosulfite and following weight parts forms:
Al
2o
343 parts of the bauxitic clay grog particles that content>=87wt%, particle diameter are 2～4mm;
SiC content >=90wt% and free carbon content be not less than 5%, cross 18 parts of the carborundum powders of 200 mesh sieves;
Al
2o
312 parts, the fused white corundum powder of content>=99wt%, mistake 300 mesh sieves;
Al
2o
36 parts, the andaluzite powder of content>=55wt%, mistake 200 mesh sieves;
SiO
2the SiO of content>=95wt%, particle diameter≤0.3 μ m
23 parts of super-fine powder;
0.5 part of the elemental silicon super-fine powder of particle diameter≤5 μ m;
0.5 part of the pure aluminum super-fine powder of particle diameter≤5 μ m;
Al
2o
3content>=30wt% and SiO
2content>=50wt%, particle diameter≤1mm float 7 parts, pearl;
Al
2o
310 parts of the soft flame-proof clay powders of content>=30wt%, mistake 200 mesh sieves.
Wherein the proportion of lignosulfite is 1.18g/mL, and consumption is 4.5% of above-mentioned solid material gross weight.
lead taking above-mentioned low-heat the silicon Corundum composite brick that silicon corundum brick material is made as light layer material,this composite brick is molded and fire and form through Double-plate machine by above-mentioned low thermal conductance silicon corundum brick material and heavy brick material two sections of material.Wherein the weight of heavy brick material consists of:
Al
2o
340 parts of bauxitic clay particles that content>=85wt%, particle diameter are 2～4mm,
Al
2o
35 parts of the emergies of content>=90wt%, particle diameter≤1mm,
Al
2o
3content>=90wt%, cross 325 mesh sieves 12 parts of lapis amiridiss,
SiC >=97wt%, cross 200 mesh sieves 12 parts of carborundum powders,
Al
2o
3content>=35wt%, cross 200 mesh sieves 5 parts, bonding clay powder,
4 parts of the wooden sulfonate solution of industry,
Al
2o
38 parts of the aquamaine stone flours of>=58wt%.
This composite brick makes via following method:
(1) mixing low thermal conductance silicon corundum brick material: by carborundum powder, fused white corundum powder, andaluzite powder, SiO
2super-fine powder, elemental silicon super-fine powder, pure aluminum super-fine powder and soft flame-proof clay powder add pulvis mixing pan successively, and mixed grind 10 minutes, for subsequent use continuously; By bauxitic clay grog particle with float after pearl mixes and insert particle mixing pan, add liquid bonding agent mixed grind 2 minutes, then the pulvis mixing is joined in operating particle mixing pan, more abundant mixed grind 10 minutes.
(2) mixing heavy brick material: lapis amiridis, carborundum powder, function admixture and bonding clay powder are placed in to pulvis mixing pan and fully mix 5 minutes, for subsequent use; Bauxitic clay particle, emergy and additional liquid bonding agent are placed in to particle mixing pan mixed grind 3 minutes; The pulvis mixing is poured in operating particle mixing pan and fully mixed 15 minutes.
(3) moulding: material chamber is divided into two portions in proportion with dividing plate mould, filling low thermal conductance silicon corundum brick material and heavy brick material respectively, wherein low thermal conductance silicon corundum brick material accounts for 50% of composite brick cumulative volume; After extracting dividing plate out, adopt Double-plate machine molded, forming pressure 100MPa;
(4) burn till: the base substrate after moulding is placed at 80 DEG C and is dried 24 hours, and loading of kiln, fires 20 hours at 1480 DEG C ± 10 DEG C, then cooling with kiln.
embodiment 2
low thermal conductance silicon corundum brick material,solid material by liquid bonding agent lignosulfite and following weight parts forms:
Al
2o
342 parts of the bauxitic clay grog particles that content>=87wt%, particle diameter are 2～4mm;
SiC content >=90wt% and free carbon content be not less than 5%, cross 19 parts of the carborundum powders of 200 mesh sieves;
Al
2o
313 parts, the fused white corundum powder of content>=99wt%, mistake 300 mesh sieves;
Al
2o
36 parts, the andaluzite powder of content>=55wt%, mistake 200 mesh sieves;
SiO
2the SiO of content>=95wt%, particle diameter≤0.3 μ m
23 parts of super-fine powder;
0.5 part of the elemental silicon super-fine powder of particle diameter≤5 μ m;
0.5 part of the pure aluminum super-fine powder of particle diameter≤5 μ m;
Al
2o
3content>=30wt% and SiO
2content>=50wt%, particle diameter≤1mm float 8 parts, pearl;
Al
2o
310 parts of the soft flame-proof clay powders of content>=30wt%, mistake 200 mesh sieves.
Wherein the proportion of lignosulfite is 1.15g/mL, and consumption is 4.5% of above-mentioned solid material gross weight.
lead taking above-mentioned low-heat the silicon Corundum composite brick that silicon corundum brick material is made as light layer material,this composite brick is molded and fire and form through Double-plate machine by above-mentioned low thermal conductance silicon corundum brick material and heavy brick material two sections of material.Wherein the weight of heavy brick material consists of:
Al
2o
345 parts of bauxitic clay particles that content>=85wt%, particle diameter are 2～4mm,
Al
2o
310 parts of the emergies of content>=90wt%, particle diameter≤1mm,
Al
2o
3content>=90wt%, cross 325 mesh sieves 14 parts of lapis amiridiss,
SiC >=97wt%, cross 200 mesh sieves 13 parts of carborundum powders,
Al
2o
3content>=35wt%, cross 200 mesh sieves 8 parts, bonding clay powder,
3 parts of methocel solutions,
ZrO
23 parts of the zirconia powders of>=99wt%.
This composite brick makes via following method:
(1) mixing low thermal conductance silicon corundum brick material: by carborundum powder, fused white corundum powder, andaluzite powder, SiO
2super-fine powder, elemental silicon super-fine powder, pure aluminum super-fine powder and soft flame-proof clay powder add pulvis mixing pan successively, and mixed grind 12 minutes, for subsequent use continuously; By bauxitic clay grog particle with float after pearl mixes and insert particle mixing pan, add liquid bonding agent mixed grind 3 minutes, then the pulvis mixing is joined in operating particle mixing pan, more abundant mixed grind 5 minutes.
(2) mixing heavy brick material: lapis amiridis, carborundum powder, function admixture and bonding clay powder are placed in to pulvis mixing pan and fully mix 10 minutes, for subsequent use; Bauxitic clay particle, emergy and additional liquid bonding agent are placed in to particle mixing pan mixed grind 2 minutes; The pulvis mixing is poured in operating particle mixing pan and fully mixed 10 minutes.
(3) moulding: material chamber is divided into two portions in proportion with dividing plate mould, filling low thermal conductance silicon corundum brick material and heavy brick material respectively, wherein the volume of low thermal conductance silicon corundum brick material is 40% of composite brick cumulative volume; After extracting dividing plate out, adopt Double-plate machine molded, forming pressure 150MPa;
(4) burn till: the base substrate after moulding is placed at 100 DEG C and is dried 24 hours, and loading of kiln, fires 20～21 hours at 1480 DEG C ± 10 DEG C, then cooling with kiln.
embodiment 3
low thermal conductance silicon corundum brick material,solid material by liquid bonding agent lignosulfite and following weight parts forms:
Al
2o
345 parts of the bauxitic clay grog particles that content>=87wt%, particle diameter are 2～4mm;
SiC content >=90wt% and free carbon content be not less than 5%, cross 15 parts of the carborundum powders of 200 mesh sieves;
Al
2o
310 parts, the fused white corundum powder of content>=99wt%, mistake 300 mesh sieves;
Al
2o
38 parts, the andaluzite powder of content>=55wt%, mistake 200 mesh sieves;
SiO
2the SiO of content>=95wt%, particle diameter≤0.3 μ m
24 parts of super-fine powder;
1 part of the elemental silicon super-fine powder of particle diameter≤5 μ m;
1 part of the pure aluminum super-fine powder of particle diameter≤5 μ m;
Al
2o
3content>=30wt% and SiO
2content>=50wt%, particle diameter≤1mm float 8 parts, pearl;
Al
2o
39 parts of the soft flame-proof clay powders of content>=30wt%, mistake 200 mesh sieves.
Wherein the proportion of lignosulfite is 1.25g/mL, and consumption is 4% of above-mentioned solid material gross weight.
lead taking above-mentioned low-heat the silicon Corundum composite brick that silicon corundum brick material is made as light layer material,this composite brick is molded and fire and form through Double-plate machine by above-mentioned low thermal conductance silicon corundum brick material and heavy brick material two sections of material.Wherein the weight of heavy brick material consists of:
Al
2o
350 parts of bauxitic clay particles that content>=85wt%, particle diameter are 2～4mm,
Al
2o
315 parts of the emergies of content>=90wt%, particle diameter≤1mm,
Al
2o
3content>=90wt%, cross 325 mesh sieves 15 parts of lapis amiridiss,
SiC >=97wt%, cross 200 mesh sieves 15 parts of carborundum powders,
Al
2o
3content>=35wt%, cross 200 mesh sieves 10 parts, bonding clay powder,
5 parts of phosphate dihydrogen aluminum solutions,
Al
2o
310 parts of the aquamaine stone flours of>=58wt%.
This composite brick makes via following method:
(1) mixing low thermal conductance silicon corundum brick material: by carborundum powder, fused white corundum powder, andaluzite powder, SiO
2super-fine powder, elemental silicon super-fine powder, pure aluminum super-fine powder and soft flame-proof clay powder add pulvis mixing pan successively, and mixed grind 15 minutes, for subsequent use continuously; By bauxitic clay grog particle with float after pearl mixes and insert particle mixing pan, add liquid bonding agent mixed grind 2 minutes, then the pulvis mixing is joined in operating particle mixing pan, more abundant mixed grind 8 minutes.
(2) mixing heavy brick material: lapis amiridis, carborundum powder, function admixture and bonding clay powder are placed in to pulvis mixing pan and fully mix 8 minutes, for subsequent use; Bauxitic clay particle, emergy and additional liquid bonding agent are placed in to particle mixing pan mixed grind 2 minutes; The pulvis mixing is poured in operating particle mixing pan and fully mixed 12 minutes.
(3) moulding: material chamber is divided into two portions in proportion with dividing plate mould, filling low thermal conductance silicon corundum brick material and heavy brick material respectively, wherein the volume of low thermal conductance silicon corundum brick material is 45% of composite brick cumulative volume; After extracting dividing plate out, adopt Double-plate machine molded, forming pressure 110MPa;
(4) burn till: the base substrate after moulding is placed at 120 DEG C and is dried 24 hours, and loading of kiln, fires 22 hours at 1480 DEG C ± 10 DEG C, then cooling with kiln.
embodiment 4
low thermal conductance silicon corundum brick material,solid material by liquid bonding agent lignosulfite and following weight parts forms:
Al
2o
338 parts of the bauxitic clay grog particles that content>=87wt%, particle diameter are 2～4mm;
SiC content >=90wt% and free carbon content be not less than 5%, cross 20 parts of the carborundum powders of 200 mesh sieves;
Al
2o
38 parts, the fused white corundum powder of content>=99wt%, mistake 300 mesh sieves;
Al
2o
38 parts, the andaluzite powder of content>=55wt%, mistake 200 mesh sieves;
SiO
2the SiO of content>=95wt%, particle diameter≤0.3 μ m
23 parts of super-fine powder;
1 part of the elemental silicon super-fine powder of particle diameter≤5 μ m;
1 part of the pure aluminum super-fine powder of particle diameter≤5 μ m;
Al
2o
3content>=30wt% and SiO
2content>=50wt%, particle diameter≤1mm float 5 parts, pearl;
Al
2o
38 parts of the soft flame-proof clay powders of content>=30wt%, mistake 200 mesh sieves.
Wherein the proportion of lignosulfite is 1.20g/mL, and its consumption is 4.2% of above-mentioned solid material gross weight.
lead taking above-mentioned low-heat the silicon Corundum composite brick that silicon corundum brick material is made as light layer material,this composite brick is molded and fire and form through Double-plate machine by above-mentioned low thermal conductance silicon corundum brick material and heavy brick material two sections of material.Wherein the weight of heavy brick material consists of:
Al
2o
342 parts of bauxitic clay particles that content>=85wt%, particle diameter are 2～4mm,
Al
2o
38 parts of the emergies of content>=90wt%, particle diameter≤1mm,
Al
2o
3content>=90wt%, cross 325 mesh sieves 12 parts of lapis amiridiss,
SiC >=97wt%, cross 200 mesh sieves 14 parts of carborundum powders,
Al
2o
3content>=35wt%, cross 200 mesh sieves 15 parts, bonding clay powder,
4 parts of the wooden sulfonate solution of industry,
ZrO
26 parts of the zirconia powders of>=99wt%.
This composite brick makes via following method:
(1) mixing low thermal conductance silicon corundum brick material: by carborundum powder, fused white corundum powder, andaluzite powder, SiO
2super-fine powder, elemental silicon super-fine powder, pure aluminum super-fine powder and soft flame-proof clay powder add pulvis mixing pan successively, and mixed grind 12 minutes, for subsequent use continuously; By bauxitic clay grog particle with float after pearl mixes and insert particle mixing pan, add liquid bonding agent mixed grind 3 minutes, then the pulvis mixing is joined in operating particle mixing pan, more abundant mixed grind 10 minutes.
(2) mixing heavy brick material: lapis amiridis, carborundum powder, function admixture and bonding clay powder are placed in to pulvis mixing pan and fully mix 6 minutes, for subsequent use; Bauxitic clay particle, emergy and additional liquid bonding agent are placed in to particle mixing pan mixed grind 3 minutes; The pulvis mixing is poured in operating particle mixing pan and fully mixed 15 minutes.
(3) moulding: material chamber is divided into two portions in proportion with dividing plate mould, filling low thermal conductance silicon corundum brick material and heavy brick material respectively, wherein low thermal conductance silicon corundum brick material accounts for 50% of composite brick cumulative volume; After extracting dividing plate out, adopt Double-plate machine molded, forming pressure 100MPa;
(4) burn till: the base substrate after moulding is placed at 150 DEG C and is dried 24 hours, and loading of kiln, fires 24 hours at 1480 DEG C ± 10 DEG C, then cooling with kiln.
embodiment 5
From embodiment 1-4, extract 20 silicon Corundum composite brick samples (wherein each embodiment extracts 5 parallel sample), respectively the lightweight part of these 20 samples is carried out to Al
2o
3 ,the performance measurements such as SiC, MgO composition measurement and refractoriness under load, cold crushing strength, apparent porosity, thermal shock, thermal conductivity, volume density and wear resistance.Meanwhile, choose from the market silicon corundum brick, premium high-alumina brick, three common kinds of spinel brick, each kind extracts five samples and carries out comparative determination.Statistical survey result, lists in table 1.
The significant parameter measurement result of the different refractory brick samples of table 1
Meanwhile, with reference to the formula of embodiment 1-4, prepare by the following method sample:
1) by compound according to volume 1:1 to low thermal conductance silicon corundum brick material and heavy brick material, complex method is flat opposed; Forming pressure 100MPa, is placed in base substrate at 100 DEG C and dries 24 hours after mechanical pressing, and loading of kiln is fired 24 hours at 1480 DEG C ± 10 DEG C, then cooling with kiln.
2) utilize brick cutting machine that the composite brick after sintering is processed into 40 × 40 × 160(unit: rectangular parallelepiped sample mm), carries out bending test to sample.
Test-results: the folding strength of sample is 7.5-7.8MPa, and section an ancient unit of weight is irregular form.Not there is not neat fracture along bonding surface in sample, shows that bonding strength is between the two much larger than light layer self intensity.
Comprehensive above-mentioned experimental result is known:
1) silicon Corundum composite brick of the present invention is compared with existing silicon corundum brick, premium high-alumina brick, spinel brick, and the former thermal conductivity is obviously lower.Utilize low thermal conductance silicon Corundum composite brick masonry cement rotary kiln transition belt provided by the invention, cylindrical shell medial temperature is 186 DEG C, and spinel brick and siliceous mullite brick are respectively 360 DEG C and 295 DEG C, and its heat insulating, energy conservation and consumption reduction effects are obvious.
2) lightweight part toughness increases, and has effectively overcome the various mechanical stresses and the thermal stresses that cause due to frequent start-stop kiln; Lightweight and heavy part have higher bonding strength.
3) silicon Corundum composite brick density provided by the invention is little compared with the heavy such as spinel brick and siliceous mullite brick brick, and unit volume brick using amount is light, has alleviated the heavy burden of Thermal Equipment, alleviates the load of motor device simultaneously, has played energy-conservation effect.
Claims (9)
1. low thermal conductance silicon corundum brick material, is characterized in that, is made up of: Al the solid material of liquid bonding agent and following weight parts
2o
338～45 parts of bauxitic clay grog particles, SiC content>=90wt% and the free carbon content of content>=87wt% is not less than 5% 15～20 parts of carborundum powders, Al
2o
38～13 parts, the fused white corundum powder of content>=99wt%, Al
2o
36～8 parts, the andaluzite powder of content>=55wt%, SiO
2the SiO of content>=95wt%
23～5 parts of super-fine powder, 0.5～1 part of elemental silicon super-fine powder, 0.5～1 part of pure aluminum super-fine powder, Al
2o
3content>=30wt% and SiO
2content>=50wt% floats 3～5 parts, pearl, Al
2o
38～10 parts of the soft flame-proof clay powders of content>=30wt%; Wherein, the particle diameter of described bauxitic clay grog particle is 2～4mm; Described carborundum powder is crossed 200 mesh sieves, and fused white corundum powder is crossed 300 mesh sieves, and andaluzite powder is crossed 200 mesh sieves, and soft flame-proof clay powder is crossed 200 mesh sieves; Described SiO
2particle diameter≤0.3 μ the m of super-fine powder, the particle diameter≤5 μ m of elemental silicon, pure aluminum super-fine powder, described in float bead footpath≤1mm.
2. low thermal conductance silicon corundum brick material as claimed in claim 1, is characterized in that, described liquid bonding agent is the lignosulfite of proportion 1.15～1.25g/mL, and its consumption is 4～4.5% of described solid material gross weight.
3. the silicon Corundum composite brick of being made up of the arbitrary described low thermal conductance silicon corundum brick material of claim 1-2, is characterized in that, this composite brick is molded and fire and form through Double-plate machine by described low thermal conductance silicon corundum brick material and heavy brick material two sections of material.
4. silicon Corundum composite brick as claimed in claim 3, is characterized in that, the weight of described heavy brick material consists of: Al
2o
340～50 parts of the bauxitic clay particles of content>=85wt%, Al
2o
35～15 parts of the emergies of content>=90wt%, Al
2o
312～15 parts of the carborundum powders of 12～15 parts of content>=90wt% lapis amiridiss, SiC>=97wt%, Al
2o
35～15 parts, the bonding clay powder of content>=35wt%, 3～5 parts of additional liquid bonding agents, 3～10 parts of function admixtures.
5. silicon Corundum composite brick as claimed in claim 4, is characterized in that, in described heavy brick material, the particle diameter of bauxitic clay particle is 2～4mm, emergy particle diameter≤1mm, and lapis amiridis is crossed 325 mesh sieves, and carborundum powder is crossed 200 mesh sieves, and bonding clay powder is crossed 200 mesh sieves.
6. silicon Corundum composite brick as claimed in claim 4, is characterized in that, the additional liquid bonding agent in described heavy brick material is industrial wooden sulfonate solution, methocel solution or phosphate dihydrogen aluminum solution; Described function admixture is Al
2o
3aquamaine stone flour or the ZrO of>=58wt%
2the zirconia powder of>=99wt%.
7. silicon Corundum composite brick as claimed in claim 3, is characterized in that, described composite brick makes via following method: (1) mixing low thermal conductance silicon corundum brick material; (2) mixing heavy brick material; (3) moulding: material chamber is divided into two portions in proportion with dividing plate mould, filling low thermal conductance silicon corundum brick material and heavy brick material respectively, wherein the volume of low thermal conductance silicon corundum brick material is no more than 50% of composite brick cumulative volume; After extracting dividing plate out, adopt Double-plate machine molded, forming pressure is not less than 100MPa; (4) burn till: the base substrate after moulding is placed at 80～150 DEG C and is dried 24 hours, and loading of kiln, fires 20～24 hours at 1480 DEG C ± 10 DEG C, then cooling with kiln.
8. the silicon Corundum composite brick as described in as arbitrary in claim 4-7, is characterized in that, the mixing step of low thermal conductance silicon corundum brick material is: by carborundum powder, fused white corundum powder, andaluzite powder, SiO
2super-fine powder, elemental silicon super-fine powder, pure aluminum super-fine powder and soft flame-proof clay powder add pulvis mixing pan successively, and mixed grind 10～15 minutes, for subsequent use continuously; By bauxitic clay grog particle with float after pearl mixes and insert particle mixing pan, add liquid bonding agent mixed grind 2～3 minutes, then the pulvis mixing is joined in operating particle mixing pan, more abundant mixed grind 5～10 minutes.
9. silicon Corundum composite brick as claimed in claim 8, is characterized in that, the mixing step of described heavy brick material is: lapis amiridis, carborundum powder, function admixture and bonding clay powder are placed in to pulvis mixing pan and fully mix 5～10 minutes, and for subsequent use; Bauxitic clay particle, emergy and additional liquid bonding agent are placed in to particle mixing pan mixed grind 2～3 minutes; Pour the pulvis mixing in the operating particle mixing pan abundant 10-15 minute of mixing.
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| CN105669170B (en) * | 2016-01-08 | 2018-11-09 | 浙江长兴久鑫耐火材料科技股份有限公司 | A kind of heavy and light composite refractory brick losing pore creating material containing burning |
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| CN105503222B (en) * | 2016-01-08 | 2018-11-27 | 浙江长兴久鑫耐火材料科技股份有限公司 | A kind of composite refractory brick containing floating bead |
| CN105481408A (en) * | 2016-01-08 | 2016-04-13 | 浙江长兴久鑫耐火材料有限公司 | Composite refractory brick |
| CN107759233A (en) * | 2016-08-19 | 2018-03-06 | 张丽媛 | A kind of insulated pouring material |
| CN107879732B (en) * | 2017-11-27 | 2020-09-08 | 武汉科技大学 | Dispersive breathable refractory material and preparation method thereof |
| CN111662076A (en) * | 2020-07-01 | 2020-09-15 | 郑州凯翔耐火材料有限公司 | High-strength high-alumina brick and preparation method thereof |
| CN111662075A (en) * | 2020-07-01 | 2020-09-15 | 郑州凯翔耐火材料有限公司 | Composite aluminum silicon carbide brick and preparation method thereof |
| CN112299826A (en) * | 2020-10-27 | 2021-02-02 | 郑州荣盛窑炉耐火材料有限公司 | Aluminum-chromium-zirconium-silicon composite brick for zinc oxide rotary kiln reaction zone and preparation method thereof |
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