CN103204691A - 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 continual renovation of technology of producing cement, cement manufacture plant day by day to maximize, energy-conservationization direction develops, increase output, improve the quality, save energy and reduce the cost, reducing cost becomes the key that enterprise increases benefit.
At present, rotary kiln is main flow with spinel brick and siliceous mullite brick still with refractory brick, but this two classes brick all exists thermal conductivity height, defective that thermal waste is big.For this reason, some producers and R﹠D institution have carried out number of research projects, and have released some heavy, that lightweight combines composite bricks.But cross because of lightweight working lining structural strength and lowly can't satisfy service requirements, this type of composite brick does not obtain to promote on a large scale, causes in the industry so far still based on the heavy brick.Rotary kiln with the 10000t/d of conch group is example, and its preceding transitional zone is used spinel brick, and what clinkering zone used is magnesia chrome brick.Since the thermal conductivity of spinel brick and magnesia chrome brick big (〉=2.7W/mK), make kiln cylinder body outside wall temperature higher (about about 380 ℃, can reach 420 ℃ during high temperature greatly).The too high one side of cylinder body outer wall temperature can make the kiln cylinder body heat radiation increase, thereby has strengthened heat consumption of clinker, has increased the 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, influenced the operation factor of cement rotary kiln.As seen, if can use low thermal conductance, combined strength bination height, refractory lining that heat-proof quality is good at these key positions, not only can reduce the temperature of transitional zone position cylindrical shell, reduce heat lost by radiation, cut down the consumption of energy, also be conducive to simultaneously the maintenance of equipment, improve operation rate.
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 that also to provide with this brick material simultaneously be the light layer raw material.
Based on above-mentioned purpose, the present invention has taked following technical scheme: low thermal conductance silicon corundum brick material, formed by the solid material of liquid wedding 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 in the fused white corundum powder of content 〉=99wt%, Al
2O
36～8 parts in 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 on pearl, Al
2O
38～10 parts of the soft flame-proof clay powders of content 〉=30wt%.
Described liquid wedding agent is the lignosulfite of proportion 1.15～1.25g/mL, and its consumption is 4～4.5% of described solid material gross weight.
Described bauxitic clay grog particle grain size is 2～4mm; Described carborundum powder is crossed 200 mesh sieves, and the fused white corundum powder is crossed 300 mesh sieves, and the andaluzite powder is crossed 200 mesh sieves, and the soft flame-proof clay powder is crossed 200 mesh sieves; Described SiO
2The particle diameter of super-fine powder≤0.3 μ m, the particle diameter of elemental silicon, pure aluminum super-fine powder≤5 μ m, the described bead footpath≤1mm that floats.
By the silicon corundum composite brick that described low thermal conductance silicon corundum brick material is made, this composite brick by described low thermal conductance silicon corundum brick material and heavy brick material two sections of material through two-sided mechanical pressing and fire and form.
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
3Content 〉=12～15 parts of 90wt% lapis amiridiss, 12～15 parts of the carborundum powders of SiC 〉=97wt%, Al
2O
35～15 parts in the bonding clay powder of content 〉=35wt%, add 3～5 parts of liquid wedding agents, 3～10 parts of function admixtures.
The bauxitic clay particle grain size is 2～4mm in the described heavy brick material, and emergy particle diameter≤1mm, lapis amiridis cross 325 mesh sieves, and carborundum powder is crossed 200 mesh sieves, and the bonding clay powder is crossed 200 mesh sieves.
The liquid wedding agent that adds in the 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: will expect chamber separated into two parts in proportion with the dividing plate mould, thermal conductance silicon corundum brick material and heavy brick material are hanged down in filling respectively, and wherein the volume of low thermal conductance silicon corundum brick material is no more than 50% of composite brick cumulative volume; Adopt two-sided mechanical pressing after extracting dividing plate out, forming pressure is not less than 100MPa; (4) burn till: the base substrate after the moulding is placed 80～150 ℃ of down oven dry 24 hours, and loading of kiln was fired 20～24 hours under 1480 ℃ ± 10 ℃, cooled off with kiln then.
The mixing step of described low thermal conductance silicon corundum brick material is: with 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 the pulvis mixing pan successively, and mixed grind is 10～15 minutes continuously, and is standby; Insert the particle mixing pan with bauxitic clay grog particle with after floating the pearl mixing, added liquid wedding agent mixed grind 2～3 minutes, then the pulvis that mixes is joined in the operating particle mixing pan, abundant mixed grind is 5～10 minutes again.
The mixing step of described heavy brick material is: place the pulvis mixing pan fully to mix 5～10 minutes in lapis amiridis, carborundum powder, function admixture and bonding clay powder, and standby; With bauxitic clay particle, emergy and add the liquid wedding agent and placed particle mixing pan mixed grind 2～3 minutes; Pour the pulvis that mixes in the operating particle mixing pan abundant the mixing 10-15 minute.
In low thermal conductance silicon corundum brick material provided by the invention, the SiO of adding
2Can stop the propagation of heat energy effectively at the inner nanometer micropore that forms of goods after super-fine powder is fired; The andaluzite powder is the mechanism of utilizing the effect of andaluzite microdilatancy and floating the fired volumetric shrinkage of pearl with the adding of floating pearl, increase the void content of goods, further reduce the goods thermal conduction capability, also receive separately the volumetric shrinkage that causes and the stress that expands and bring under the high temperature simultaneously mutually; The adding of SiC not only can effectively improve the high-temperature behavior of goods, has also stopped thermal radiation effectively 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 among energy and the SiC forms β-SiC and Al respectively
4C
3, can increase product strength effectively.Test-results shows, low thermal conductance silicon corundum brick material products provided by the invention can guarantee that product is withstand voltage, obviously reduce the thermal conductivity of product on the use basis of wear resisting property that help enterprise to realize energy-saving and cost-reducing target, its economic and social benefit is remarkable.Be silicon corundum composite brick performance brilliance and the yield rate height (can reach 99%) of light layer material with it, the masonry cement rotary kiln transition belt of using, the cylindrical shell medial temperature only is 186 ℃, far below existing spinel brick and siliceous mullite brick on the market.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
Embodiment 1
Low thermal conductance silicon corundum brick material,Solid material by liquid wedding agent lignosulfite and following weight parts is formed:
Al
2O
3Content 〉=87wt%, particle diameter are 43 parts of the bauxitic clay grog particles of 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 in the fused white corundum powder of content 〉=99wt%, mistake 300 mesh sieves;
Al
2O
36 parts in 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 on 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.
Leading silicon corundum brick material with above-mentioned low-heat is the silicon corundum composite brick that the light layer material is made,This composite brick by above-mentioned low thermal conductance silicon corundum brick material and heavy brick material two sections of material through two-sided mechanical pressing and fire and form.Wherein the weight of heavy brick material consists of:
Al
2O
3Content 〉=85wt%, particle diameter be 2～4mm 40 parts of bauxitic clay particles,
Al
2O
35 parts of the emergies of content 〉=90wt%, particle diameter≤1mm,
Al
2O
312 parts of the lapis amiridiss of content 〉=90wt%, mistake 325 mesh sieves,
12 parts of the carborundum powders of SiC 〉=97wt%, mistake 200 mesh sieves,
Al
2O
35 parts in the bonding clay powder of content 〉=35wt%, mistake 200 mesh sieves,
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: with 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 the pulvis mixing pan successively, and mixed grind is 10 minutes continuously, and is standby; Insert the particle mixing pan with bauxitic clay grog particle with after floating the pearl mixing, added liquid wedding agent mixed grind 2 minutes, then the pulvis that mixes is joined in the operating particle mixing pan, abundant mixed grind is 10 minutes again.
(2) mixing heavy brick material: place the pulvis mixing pan fully to mix 5 minutes in lapis amiridis, carborundum powder, function admixture and bonding clay powder, standby; With bauxitic clay particle, emergy and add the liquid wedding agent and placed particle mixing pan mixed grind 3 minutes; Pour the pulvis that mixes in the operating particle mixing pan abundant the mixing 15 minutes.
(3) moulding: will expect chamber separated into two parts in proportion with the dividing plate mould, the low thermal conductance silicon corundum brick material of filling and heavy brick material wherein hang down thermal conductance silicon corundum brick material and account for 50% of composite brick cumulative volume respectively; Adopt two-sided mechanical pressing, forming pressure 100MPa after extracting dividing plate out;
(4) burn till: the base substrate after the moulding is placed 80 ℃ of down oven dry 24 hours, and loading of kiln was fired 20 hours under 1480 ℃ ± 10 ℃, cooled off with kiln then.
Embodiment 2
Low thermal conductance silicon corundum brick material,Solid material by liquid wedding agent lignosulfite and following weight parts is formed:
Al
2O
3Content 〉=87wt%, particle diameter are 42 parts of the bauxitic clay grog particles of 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 in the fused white corundum powder of content 〉=99wt%, mistake 300 mesh sieves;
Al
2O
36 parts in 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 on 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.
Leading silicon corundum brick material with above-mentioned low-heat is the silicon corundum composite brick that the light layer material is made,This composite brick by above-mentioned low thermal conductance silicon corundum brick material and heavy brick material two sections of material through two-sided mechanical pressing and fire and form.Wherein the weight of heavy brick material consists of:
Al
2O
3Content 〉=85wt%, particle diameter be 2～4mm 45 parts of bauxitic clay particles,
Al
2O
310 parts of the emergies of content 〉=90wt%, particle diameter≤1mm,
Al
2O
314 parts of the lapis amiridiss of content 〉=90wt%, mistake 325 mesh sieves,
13 parts of the carborundum powders of SiC 〉=97wt%, mistake 200 mesh sieves,
Al
2O
38 parts in the bonding clay powder of content 〉=35wt%, mistake 200 mesh sieves,
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: with 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 the pulvis mixing pan successively, and mixed grind is 12 minutes continuously, and is standby; Insert the particle mixing pan with bauxitic clay grog particle with after floating the pearl mixing, added liquid wedding agent mixed grind 3 minutes, then the pulvis that mixes is joined in the operating particle mixing pan, abundant mixed grind is 5 minutes again.
(2) mixing heavy brick material: place the pulvis mixing pan fully to mix 10 minutes in lapis amiridis, carborundum powder, function admixture and bonding clay powder, standby; With bauxitic clay particle, emergy and add the liquid wedding agent and placed particle mixing pan mixed grind 2 minutes; Pour the pulvis that mixes in the operating particle mixing pan abundant the mixing 10 minutes.
(3) moulding: will expect chamber separated into two parts in proportion with the dividing plate mould, thermal conductance silicon corundum brick material and heavy brick material are hanged down in filling respectively, and wherein the volume of low thermal conductance silicon corundum brick material is 40% of composite brick cumulative volume; Adopt two-sided mechanical pressing, forming pressure 150MPa after extracting dividing plate out;
(4) burn till: the base substrate after the moulding is placed 100 ℃ of down oven dry 24 hours, and loading of kiln was fired 20～21 hours under 1480 ℃ ± 10 ℃, cooled off with kiln then.
Embodiment 3
Low thermal conductance silicon corundum brick material,Solid material by liquid wedding agent lignosulfite and following weight parts is formed:
Al
2O
3Content 〉=87wt%, particle diameter are 45 parts of the bauxitic clay grog particles of 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 in the fused white corundum powder of content 〉=99wt%, mistake 300 mesh sieves;
Al
2O
38 parts in 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 on 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.
Leading silicon corundum brick material with above-mentioned low-heat is the silicon corundum composite brick that the light layer material is made,This composite brick by above-mentioned low thermal conductance silicon corundum brick material and heavy brick material two sections of material through two-sided mechanical pressing and fire and form.Wherein the weight of heavy brick material consists of:
Al
2O
3Content 〉=85wt%, particle diameter be 2～4mm 50 parts of bauxitic clay particles,
Al
2O
315 parts of the emergies of content 〉=90wt%, particle diameter≤1mm,
Al
2O
315 parts of the lapis amiridiss of content 〉=90wt%, mistake 325 mesh sieves,
15 parts of the carborundum powders of SiC 〉=97wt%, mistake 200 mesh sieves,
Al
2O
310 parts in the bonding clay powder of content 〉=35wt%, mistake 200 mesh sieves,
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: with 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 the pulvis mixing pan successively, and mixed grind is 15 minutes continuously, and is standby; Insert the particle mixing pan with bauxitic clay grog particle with after floating the pearl mixing, added liquid wedding agent mixed grind 2 minutes, then the pulvis that mixes is joined in the operating particle mixing pan, abundant mixed grind is 8 minutes again.
(2) mixing heavy brick material: place the pulvis mixing pan fully to mix 8 minutes in lapis amiridis, carborundum powder, function admixture and bonding clay powder, standby; With bauxitic clay particle, emergy and add the liquid wedding agent and placed particle mixing pan mixed grind 2 minutes; Pour the pulvis that mixes in the operating particle mixing pan abundant the mixing 12 minutes.
(3) moulding: will expect chamber separated into two parts in proportion with the dividing plate mould, thermal conductance silicon corundum brick material and heavy brick material are hanged down in filling respectively, and wherein the volume of low thermal conductance silicon corundum brick material is 45% of composite brick cumulative volume; Adopt two-sided mechanical pressing, forming pressure 110MPa after extracting dividing plate out;
(4) burn till: the base substrate after the moulding is placed 120 ℃ of down oven dry 24 hours, and loading of kiln was fired 22 hours under 1480 ℃ ± 10 ℃, cooled off with kiln then.
Embodiment 4
Low thermal conductance silicon corundum brick material,Solid material by liquid wedding agent lignosulfite and following weight parts is formed:
Al
2O
3Content 〉=87wt%, particle diameter are 38 parts of the bauxitic clay grog particles of 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 in the fused white corundum powder of content 〉=99wt%, mistake 300 mesh sieves;
Al
2O
38 parts in 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 on 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.
Leading silicon corundum brick material with above-mentioned low-heat is the silicon corundum composite brick that the light layer material is made,This composite brick by above-mentioned low thermal conductance silicon corundum brick material and heavy brick material two sections of material through two-sided mechanical pressing and fire and form.Wherein the weight of heavy brick material consists of:
Al
2O
3Content 〉=85wt%, particle diameter be 2～4mm 42 parts of bauxitic clay particles,
Al
2O
38 parts of the emergies of content 〉=90wt%, particle diameter≤1mm,
Al
2O
312 parts of the lapis amiridiss of content 〉=90wt%, mistake 325 mesh sieves,
14 parts of the carborundum powders of SiC 〉=97wt%, mistake 200 mesh sieves,
Al
2O
315 parts in the bonding clay powder of content 〉=35wt%, mistake 200 mesh sieves,
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: with 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 the pulvis mixing pan successively, and mixed grind is 12 minutes continuously, and is standby; Insert the particle mixing pan with bauxitic clay grog particle with after floating the pearl mixing, added liquid wedding agent mixed grind 3 minutes, then the pulvis that mixes is joined in the operating particle mixing pan, abundant mixed grind is 10 minutes again.
(2) mixing heavy brick material: place the pulvis mixing pan fully to mix 6 minutes in lapis amiridis, carborundum powder, function admixture and bonding clay powder, standby; With bauxitic clay particle, emergy and add the liquid wedding agent and placed particle mixing pan mixed grind 3 minutes; Pour the pulvis that mixes in the operating particle mixing pan abundant the mixing 15 minutes.
(3) moulding: will expect chamber separated into two parts in proportion with the dividing plate mould, the low thermal conductance silicon corundum brick material of filling and heavy brick material wherein hang down thermal conductance silicon corundum brick material and account for 50% of composite brick cumulative volume respectively; Adopt two-sided mechanical pressing, forming pressure 100MPa after extracting dividing plate out;
(4) burn till: the base substrate after the moulding is placed 150 ℃ of down oven dry 24 hours, and loading of kiln was fired 24 hours under 1480 ℃ ± 10 ℃, cooled off with kiln then.
Embodiment 5
From embodiment 1-4, extract 20 silicon corundum composite brick samples (wherein each embodiment extracts 5 parallel sample), respectively the lightweight of these 20 samples is partly carried out Al
2O
3 ,SiC, MgO composition measurement and performance measurements such as refractoriness under load, cold crushing strength, apparent porosity, thermal shock, thermal conductivity, volume density and wear resistance.Simultaneously, choose silicon corundum brick, premium high-alumina brick, three common kinds of spinel brick from the market, each kind extracts five samples and compares mensuration.The statistical survey result lists in table 1.
The significant parameter measurement result of the different refractory brick samples of table 1
Simultaneously, with reference to the prescription of embodiment 1-4, prepare sample according to following method:
1) will hang down thermal conductance silicon corundum brick material and heavy brick material is compound according to volume 1:1, complex method is flat opposed; Forming pressure 100MPa behind the mechanical pressing places base substrate 100 ℃ of oven dry 24 hours down, and loading of kiln was fired 24 hours under 1480 ℃ ± 10 ℃, cooled off with kiln then.
2) composite brick after utilizing brick cutting machine with sintering is processed into 40 * 40 * 160(unit: rectangular parallelepiped sample mm), carry 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.Neat fracture takes place along bonding surface in sample, shows that between the two bonding strength is much larger than light layer self intensity.
Comprehensive above-mentioned experimental result is as can be 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, the cylindrical shell medial temperature is 186 ℃, and spinel brick and siliceous mullite brick are respectively 360 ℃ and 295 ℃, and its heat insulating, energy conservation and consumption reduction effects are obvious.
2) lightweight part toughness increases, and has effectively overcome because various mechanical stresses and the thermal stresses that frequent start-stop kiln causes; Lightweight and heavy partly have higher binding strength.
3) silicon corundum composite brick density provided by the invention is little than heavy bricks such as spinel brick and siliceous mullite bricks, and the 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 (10)
1. low thermal conductance silicon corundum brick material is characterized in that, is made up of the solid material of liquid wedding 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 in the fused white corundum powder of content 〉=99wt%, Al
2O
36～8 parts in 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 on pearl, Al
2O
38～10 parts of the soft flame-proof clay powders of content 〉=30wt%.
2. low thermal conductance silicon corundum brick material as claimed in claim 1 is characterized in that described liquid wedding 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. low thermal conductance silicon corundum brick material as claimed in claim 1 is characterized in that described bauxitic clay grog particle grain size is 2～4mm; Described carborundum powder is crossed 200 mesh sieves, and the fused white corundum powder is crossed 300 mesh sieves, and the andaluzite powder is crossed 200 mesh sieves, and the soft flame-proof clay powder is crossed 200 mesh sieves; Described SiO
2The particle diameter of super-fine powder≤0.3 μ m, the particle diameter of elemental silicon, pure aluminum super-fine powder≤5 μ m, the described bead footpath≤1mm that floats.
4. the silicon corundum composite brick of being made by the arbitrary described low thermal conductance silicon corundum brick material of claim 1-3 is characterized in that, this composite brick by described low thermal conductance silicon corundum brick material and heavy brick material two sections of material through two-sided mechanical pressing and fire and form.
5. silicon corundum composite brick as claimed in claim 4 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
3Content 〉=12～15 parts of 90wt% lapis amiridiss, 12～15 parts of the carborundum powders of SiC 〉=97wt%, Al
2O
35～15 parts in the bonding clay powder of content 〉=35wt%, add 3～5 parts of liquid wedding agents, 3～10 parts of function admixtures.
6. silicon corundum composite brick as claimed in claim 5 is characterized in that, the bauxitic clay particle grain size is 2～4mm in the described heavy brick material, and emergy particle diameter≤1mm, lapis amiridis cross 325 mesh sieves, and carborundum powder is crossed 200 mesh sieves, and the bonding clay powder is crossed 200 mesh sieves.
7. silicon corundum composite brick as claimed in claim 5 is characterized in that, the liquid wedding agent that adds in the 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%.
8. silicon corundum composite brick as claimed in claim 4 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: will expect chamber separated into two parts in proportion with the dividing plate mould, thermal conductance silicon corundum brick material and heavy brick material are hanged down in filling respectively, and wherein the volume of low thermal conductance silicon corundum brick material is no more than 50% of composite brick cumulative volume; Adopt two-sided mechanical pressing after extracting dividing plate out, forming pressure is not less than 100MPa; (4) burn till: the base substrate after the moulding is placed 80～150 ℃ of down oven dry 24 hours, and loading of kiln was fired 20～24 hours under 1480 ℃ ± 10 ℃, cooled off with kiln then.
9. as the arbitrary described silicon corundum composite brick of claim 5-8, it is characterized in that the mixing step of low thermal conductance silicon corundum brick material is: with 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 the pulvis mixing pan successively, and mixed grind is 10～15 minutes continuously, and is standby; Insert the particle mixing pan with bauxitic clay grog particle with after floating the pearl mixing, added liquid wedding agent mixed grind 2～3 minutes, then the pulvis that mixes is joined in the operating particle mixing pan, abundant mixed grind is 5～10 minutes again.
10. silicon corundum composite brick as claimed in claim 9 is characterized in that, the mixing step of described heavy brick material is: place the pulvis mixing pan fully to mix 5～10 minutes in lapis amiridis, carborundum powder, function admixture and bonding clay powder, and standby; With bauxitic clay particle, emergy and add the liquid wedding agent and placed particle mixing pan mixed grind 2～3 minutes; Pour the pulvis that mixes in the operating particle mixing pan abundant the mixing 10-15 minute.
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| CN201310164086.7A CN103204691B (en) | 2013-05-07 | 2013-05-07 | Low-heat conductance silicon corundum brick material and silicon corundum composite brick made of same |
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| CN103204691B CN103204691B (en) | 2014-07-02 |
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