CN105294133A - Mullite silicon carbide composite brick with low thermal conductivity and preparation method thereof - Google Patents

Mullite silicon carbide composite brick with low thermal conductivity and preparation method thereof Download PDF

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Publication number
CN105294133A
CN105294133A CN201510856961.7A CN201510856961A CN105294133A CN 105294133 A CN105294133 A CN 105294133A CN 201510856961 A CN201510856961 A CN 201510856961A CN 105294133 A CN105294133 A CN 105294133A
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silicon carbide
particle diameter
mullite
heat conduction
low heat
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Inventor
马淑龙
张积礼
高长贺
张德义
王浩杰
王治峰
夏文斌
马飞
朱凌云
吕雪锋
李冉
柴国彦
曲睿磊
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GONGYI TONGDA ZHONGYUAN REFRACTORY TECHNOLOGY Co Ltd
TONGDA REFRACTORY TECHNOLOGIES Co Ltd
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GONGYI TONGDA ZHONGYUAN REFRACTORY TECHNOLOGY Co Ltd
TONGDA REFRACTORY TECHNOLOGIES Co Ltd
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Priority to CN201510856961.7A priority Critical patent/CN105294133A/en
Publication of CN105294133A publication Critical patent/CN105294133A/en
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Abstract

The invention discloses a mullite silicon carbide composite brick with low thermal conductivity and a preparation method thereof. The composite brick is prepared from the following raw materials in percentage by weight: 20 to 60 percent of mullite homogenized grogs, 20 to 45 percent of bauxite chamotte, 10 to 20 parts of silicon carbide, 5 to 15 parts of alumina hollow ball, 3 to 8 parts of Guangxi white clay, and with the addition of waste paper pulp accounting for 2 to 5 percent of the total weight of the raw materials. The preparation method comprises the steps that firstly mixing and grinding are performed on all the materials; the obtained mixture is subjected to compression moulding to obtain a green brick; the obtained green brick is subjected to drying, sintering, finally cooling and taking out of a kiln so as to obtain a product. According to the composite brick disclosed by the invention, the difficulties of rotary kiln cylinder body deformation caused by higher thermal conductivity causing the high temperature of the cylinder body and energy waste can be solved. The mullite silicon carbide composite brick disclosed by the invention has the characteristics of low heat conduction, thermostability, anti-erosion, anti-scouring and the like, and is used for multiple rotary kilns in China, which proves that the using effect is good.

Description

A kind of low heat conduction mullite silicon carbide compound brick and preparation method thereof
Technical field
The invention belongs to technical field of refractory materials, particularly one low heat conduction mullite silicon carbide compound brick and preparation method thereof.
Background technology
Adopting rotary kiln to be used for producing refractory raw material and treating refuse as high temperature kiln is the most generally, be also the production technique of most economical environmental protection at present, and this technique has the advantages that adaptability to raw material is strong, resource recovery is high.But because rotary kiln high temperature zone temperature is high, partial material is in fritting or fine melt state, make that its slag content is high, fluctuation is large, viscosity is low, cause the Working environment of refractory materials in kiln very harsh, higher requirement be it is also proposed to the performance of refractory materials.Tradition magnesia-alumina spinel refractory is higher due to thermal conductivity, easily causes barrel temperature higher and causes cylinder of rotary kiln to be out of shape and the waste of the energy.
The various defects existed when being used for rotary kiln according to existing traditional magnesia-alumina spinel refractory, need to research and develop a kind of new refractory materials, to solve the various defects of traditional magnesia-alumina spinel refractory for existing during rotary kiln.Based on this research purpose, the present invention through studying for a long period of time and test, thus have developed one and can substitute traditional magnesia-alumina spinel refractory for rotary kiln, and can overcome the defect of traditional magnesia-alumina spinel refractory for existing during rotary kiln.
Summary of the invention
The technical problem to be solved in the present invention is: in order to overcome the defect of existing traditional magnesia-alumina spinel refractory for existing during rotary kiln, the invention provides a kind of low heat conduction mullite silicon carbide compound brick newly and preparation method thereof.Composite brick prepared by the present invention can solve because thermal conductivity is higher, cause barrel temperature higher and cause cylinder of rotary kiln to be out of shape and the difficult problem of energy dissipation.
In order to solve the problem, the technical scheme that the present invention takes is:
The invention provides a kind of low heat conduction mullite silicon carbide compound brick, represent with weight percentage, containing mullite homogeneous material 20 ~ 60% in described low heat conduction mullite silicon carbide compound brick raw material composition, bauxite chamotte 20 ~ 45%, silicon carbide 10 ~ 20%, alumina hollow ball 5 ~ 15%, Guangxi white clay 3 ~ 8%; The additional spent pulping liquor accounting for above-mentioned various raw material gross weight 2 ~ 5%;
Described mullite homogeneous material is formulated according to mass ratio 1:1 ~ 3:0.5 ~ 1 by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities;
Described bauxite chamotte is formulated according to mass ratio 1:2 ~ 3:1 ~ 2:2 ~ 3 by the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities.
According to above-mentioned low heat conduction mullite silicon carbide compound brick, Al in described mullite homogeneous material 2o 3mass percentage be 68 ~ 72%, volume density ﹥ 2.7g/cm 3.
According to above-mentioned low heat conduction mullite silicon carbide compound brick, Al in described bauxite chamotte 2o 3mass percentage >83%, volume density >3.0g/cm 3.
According to above-mentioned low heat conduction mullite silicon carbide compound brick, the granularity <0.074mm of described silicon carbide, the mass percentage >90% of SiC in silicon carbide.
According to above-mentioned low heat conduction mullite silicon carbide compound brick, the granularity <0.5mm of described alumina hollow ball, Al in alumina hollow ball 2o 3mass percentage >97%.
According to above-mentioned low heat conduction mullite silicon carbide compound brick, the granularity <0.044mm of described Guangxi white clay, Al in the white clay of Guangxi 2o 3mass percentage >34%.
According to above-mentioned low heat conduction mullite silicon carbide compound brick, the proportion of described spent pulping liquor is 1.0 ~ 1.6g/cm 3.
In addition, provide a kind of preparation method of low heat conduction mullite silicon carbide compound brick, described preparation method comprises the following steps:
A, get the raw materials ready: first get the raw materials ready according to the ratio of above-mentioned each raw material, preparation 3mm≤particle diameter < 5mm, the mullite homogeneous material of 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities, 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, the bauxite chamotte of 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities, the silicon carbide of granularity <0.074mm, the alumina hollow ball of granularity <0.5mm, the Guangxi white clay of granularity <0.044mm and spent pulping liquor,
B, batch mixing: by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm of preparing in step a and < 1mm tri-kinds of granularities, the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and 0.074mm≤particle diameter < 1mm tri-kinds of granularities and the alumina hollow ball of <0.5mm are as aggregate, pour in edgd runner and be dry mixed 3 ~ 5min, obtain dry blend; Then in gained dry blend, add spent pulping liquor, add rear batch mixing 2 ~ 3min; Finally add remaining raw material granularity <0.074mm bauxite chamotte, granularity is the Guangxi white clay of <0.074mm silicon carbide and granularity <0.044mm, carry out mixed grind 5 ~ 10min after adding, obtain pug;
C, shaping: the pug compression moulding obtained by step b is adobe, and the volume density being controlled to shaped brick base is 2.45 ~ 2.65g/cm 3;
D, drying: the adobe of step c gained is placed in dry kiln and carries out drying, time of drying is 20 ~ 50h, and dry kiln temperature in is 45 ~ 90 DEG C, and drying temperature is 110 ~ 180 DEG C; Kiln discharge during moisture content < 0.5% in dry rear gained adobe;
E, to burn till: adopt hyperthermia tunnel Kiln or shuttle kiln to burn till gained adobe after drying, firing temperature is 1350 ~ 1450 DEG C, be incubated 10 ~ 20h under firing temperature, naturally cool to room temperature kiln discharge after burning till, obtain product low heat conduction mullite silicon carbide compound brick.
According to the preparation method of above-mentioned low heat conduction mullite silicon carbide compound brick, the compression moulding of pug described in step c is adobe, and what adopt during compacting is moulding press, and the tonnage of moulding press is 630T.
positive beneficial effect of the present invention:
1, the present invention utilizes mullite homogeneous material to replace part bauxite chamotte, and introduce a certain amount of alumina hollow ball, the product prepared low heat conduction mullite silicon carbide compound brick obviously can reduce thermal conductivity and the volume density of material, also can reduce the load of cylindrical shell while reducing barrel temperature, and then realize energy-saving and cost-reducing object.
2, the novel low heat conduction mullite silicon carbide compound brick of the rotary kiln prepared by the present invention, its main chemical compositions is: Al 2o 355% ~ 70%, SiC4% ~ 14%.
4, the novel low heat conduction mullite silicon carbide compound brick prepared of the present invention, its void content is very high, and there is a large amount of holes of holding one's breath, is greater than 20%, and volume density is 2.40 ~ 2.55g/cm 3, compressive strength is greater than 60MPa, thermal shock resistance >15 time, refractoriness under load >1550 DEG C, indices excellent property; Service requirements can be met completely.
5, product of the present invention low heat conduction mullite silicon carbide compound brick can be applicable to upper transitional zone and the preheat zone that kliner coating do not hung by rotary kiln.Product of the present invention uses through domestic many rotary kilns, proves that its result of use is good, and product of the present invention has the feature such as low heat conduction, high temperature resistant, anti-erosion, antiscour.
6, technical solution of the present invention adopts mullite homogeneous material, bauxite chamotte, silicon carbide and alumina hollow ball to be novel low heat conduction mullite silicon carbide compound brick prepared by main raw material, facts have proved: the introducing of mullite homogeneous material and alumina hollow ball obviously can reduce thermal conductivity and the volume density of material, also can reduce the load of cylindrical shell while reducing barrel temperature, and then realize energy-saving and cost-reducing object.
embodiment:
Set forth the present invention further below in conjunction with embodiment, but do not limit content of the present invention.
Al in the mullite homogeneous material adopted in the embodiment of the present invention 2o 3mass percentage be 68 ~ 72%, volume density ﹥ 2.7g/cm 3; Al in described bauxite chamotte 2o 3mass percentage >83%, volume density >3.0g/cm 3; The granularity <0.074mm of described silicon carbide, the mass percentage >90% of SiC in silicon carbide; The granularity <0.5mm of described alumina hollow ball, Al in alumina hollow ball 2o 3mass percentage >97%; The granularity <0.044mm of described Guangxi white clay, Al in the white clay of Guangxi 2o 3mass percentage >34%; The proportion of described spent pulping liquor is 1.0 ~ 1.6g/cm 3.
Embodiment 1:
The present invention's low heat conduction mullite silicon carbide compound brick, represent with weight percentage, raw material consists of: mullite homogeneous material 20%, bauxite chamotte 45%, silicon carbide 15%, alumina hollow ball 15%, Guangxi white clay 5%; The additional spent pulping liquor accounting for above-mentioned various raw material gross weight 3%;
Described 20% mullite homogeneous material is formulated according to mass ratio 1:2:0.8 by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities;
Described 45% bauxite chamotte is formulated according to mass ratio 1:2:2:2 by the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities.
Embodiment 2:
The preparation method of the embodiment of the present invention 1 low heat conduction mullite silicon carbide compound brick, its detailed step is as follows:
A, get the raw materials ready: first get the raw materials ready according to the ratio of each raw material described in embodiment 1, preparation 3mm≤particle diameter < 5mm, the mullite homogeneous material of 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities, 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, the bauxite chamotte of 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities, the silicon carbide of granularity <0.074mm, the alumina hollow ball of granularity <0.5mm, the Guangxi white clay of granularity <0.044mm and spent pulping liquor,
B, batch mixing: by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm of preparing in step a and < 1mm tri-kinds of granularities, the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and 0.074mm≤particle diameter < 1mm tri-kinds of granularities and the alumina hollow ball of <0.5mm are as aggregate, pour in edgd runner and be dry mixed 5min, obtain dry blend; Then in gained dry blend, add spent pulping liquor, add rear batch mixing 3min; Finally add remaining raw material granularity <0.074mm bauxite chamotte, granularity is the Guangxi white clay of <0.074mm silicon carbide and granularity <0.044mm, carries out mixed grind 10min, obtain pug after adding;
C, shaping: the pug compression moulding obtained by step b is adobe, and what adopt during compacting is moulding press, and the tonnage of moulding press is 630T; The volume density being controlled to shaped brick base is 2.45 ~ 2.65g/cm 3;
D, drying: the adobe of step c gained is placed in dry kiln and carries out drying, time of drying is 36h, and dry kiln temperature in is 50 ~ 60 DEG C, and drying temperature is 120 ~ 130 DEG C; Kiln discharge during moisture content < 0.5% in dry rear gained adobe;
E, to burn till: adopt hyperthermia tunnel Kiln or shuttle kiln to burn till gained adobe after drying, firing temperature is 1400 DEG C, is incubated 16h under firing temperature, naturally cools to room temperature kiln discharge after burning till, and obtains product low heat conduction mullite silicon carbide compound brick.
The performance index of products obtained therefrom are: apparent porosity 22.8%, volume density 2.55g/cm 3, cold crushing strength 91.3MPa, refractoriness under load 1578 DEG C, thermal shock resistance (1100 DEG C, water-cooled) is greater than 15 times.
Embodiment 3:
The present invention's low heat conduction mullite silicon carbide compound brick, represent with weight percentage, raw material consists of: mullite homogeneous material 40%, bauxite chamotte 33%, silicon carbide 12%, alumina hollow ball 10%, Guangxi white clay 5%; The additional spent pulping liquor accounting for above-mentioned various raw material gross weight 3%;
Described 40% mullite homogeneous material is formulated according to mass ratio 1:3:0.5 by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities;
Described 33% bauxite chamotte is formulated according to mass ratio 1:3:1:3 by the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities.
Embodiment 4:
The preparation method of the embodiment of the present invention 3 low heat conduction mullite silicon carbide compound brick, its detailed step is as follows:
A, get the raw materials ready: first get the raw materials ready according to the ratio of each raw material described in embodiment 3, preparation 3mm≤particle diameter < 5mm, the mullite homogeneous material of 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities, 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, the bauxite chamotte of 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities, the silicon carbide of granularity <0.074mm, the alumina hollow ball of granularity <0.5mm, the Guangxi white clay of granularity <0.044mm and spent pulping liquor,
B, batch mixing: by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm of preparing in step a and < 1mm tri-kinds of granularities, the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and 0.074mm≤particle diameter < 1mm tri-kinds of granularities and the alumina hollow ball of <0.5mm are as aggregate, pour in edgd runner and be dry mixed 5min, obtain dry blend; Then in gained dry blend, add spent pulping liquor, add rear batch mixing 3min; Finally add remaining raw material granularity <0.074mm bauxite chamotte, granularity is the Guangxi white clay of <0.074mm silicon carbide and granularity <0.044mm, carries out mixed grind 10min, obtain pug after adding;
C, shaping: the pug compression moulding obtained by step b is adobe, and what adopt during compacting is moulding press, and the tonnage of moulding press is 630T; The volume density being controlled to shaped brick base is 2.45 ~ 2.65g/cm 3;
D, drying: the adobe of step c gained is placed in dry kiln and carries out drying, time of drying is 28h, and dry kiln temperature in is 70 ~ 80 DEG C, and drying temperature is 150 ~ 160 DEG C; Kiln discharge during moisture content < 0.5% in dry rear gained adobe;
E, to burn till: adopt hyperthermia tunnel Kiln or shuttle kiln to burn till gained adobe after drying, firing temperature is 1450 DEG C, is incubated 10h under firing temperature, naturally cools to room temperature kiln discharge after burning till, and obtains product low heat conduction mullite silicon carbide compound brick.
The performance index of products obtained therefrom are: apparent porosity 22.1%, volume density 2.40g/cm 3, cold crushing strength 78.9MPa, refractoriness under load 1568 DEG C, thermal shock resistance (1100 DEG C, water-cooled) is greater than 15 times.
Embodiment 5:
The present invention's low heat conduction mullite silicon carbide compound brick, represent with weight percentage, raw material consists of: mullite homogeneous material 60%, bauxite chamotte 20%, silicon carbide 10%, alumina hollow ball 5%, Guangxi white clay 5%; The additional spent pulping liquor accounting for above-mentioned various raw material gross weight 3%;
Described 60% mullite homogeneous material is formulated according to mass ratio 1:1:1 by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities;
Described 20% bauxite chamotte is formulated according to mass ratio 1:2.5:1.5:2.5 by the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities.
Embodiment 6:
The preparation method of the embodiment of the present invention 5 low heat conduction mullite silicon carbide compound brick, its detailed step is as follows:
A, get the raw materials ready: first get the raw materials ready according to the ratio of each raw material described in embodiment 5, preparation 3mm≤particle diameter < 5mm, the mullite homogeneous material of 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities, 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, the bauxite chamotte of 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities, the silicon carbide of granularity <0.074mm, the alumina hollow ball of granularity <0.5mm, the Guangxi white clay of granularity <0.044mm and spent pulping liquor,
B, batch mixing: by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm of preparing in step a and < 1mm tri-kinds of granularities, the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and 0.074mm≤particle diameter < 1mm tri-kinds of granularities and the alumina hollow ball of <0.5mm are as aggregate, pour in edgd runner and be dry mixed 5min, obtain dry blend; Then in gained dry blend, add spent pulping liquor, add rear batch mixing 3min; Finally add remaining raw material granularity <0.074mm bauxite chamotte, granularity is the Guangxi white clay of <0.074mm silicon carbide and granularity <0.044mm, carries out mixed grind 10min, obtain pug after adding;
C, shaping: the pug compression moulding obtained by step b is adobe, and what adopt during compacting is moulding press, and the tonnage of moulding press is 630T; The volume density being controlled to shaped brick base is 2.45 ~ 2.65g/cm 3;
D, drying: the adobe of step c gained is placed in dry kiln and carries out drying, time of drying is 42h, and dry kiln temperature in is 45 ~ 50 DEG C, and drying temperature is 110 ~ 120 DEG C; Kiln discharge during moisture content < 0.5% in dry rear gained adobe;
E, to burn till: adopt hyperthermia tunnel Kiln or shuttle kiln to burn till gained adobe after drying, firing temperature is 1350 DEG C, is incubated 20h under firing temperature, naturally cools to room temperature kiln discharge after burning till, and obtains product low heat conduction mullite silicon carbide compound brick.
The performance index of products obtained therefrom are: apparent porosity 21.8%, volume density 2.46g/cm 3, cold crushing strength 86.5MPa, refractoriness under load 1610 DEG C, thermal shock resistance (1100 DEG C, water-cooled) is greater than 15 times.
Embodiment 7:
The present invention's low heat conduction mullite silicon carbide compound brick, represent with weight percentage, raw material consists of: mullite homogeneous material 35%, bauxite chamotte 28%, silicon carbide 20%, alumina hollow ball 9%, Guangxi white clay 8%; The additional spent pulping liquor accounting for above-mentioned various raw material gross weight 5%;
Described 60% mullite homogeneous material is formulated according to mass ratio 1:1:1 by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities;
Described 20% bauxite chamotte is formulated according to mass ratio 1:2:2:3 by the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities.
Embodiment 8:
The preparation method of the embodiment of the present invention 7 low heat conduction mullite silicon carbide compound brick, its detailed step is as follows:
A, get the raw materials ready: first get the raw materials ready according to the ratio of each raw material described in embodiment 7, preparation 3mm≤particle diameter < 5mm, the mullite homogeneous material of 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities, 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, the bauxite chamotte of 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities, the silicon carbide of granularity <0.074mm, the alumina hollow ball of granularity <0.5mm, the Guangxi white clay of granularity <0.044mm and spent pulping liquor,
B, batch mixing: by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm of preparing in step a and < 1mm tri-kinds of granularities, the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and 0.074mm≤particle diameter < 1mm tri-kinds of granularities and the alumina hollow ball of <0.5mm are as aggregate, pour in edgd runner and be dry mixed 5min, obtain dry blend; Then in gained dry blend, add spent pulping liquor, add rear batch mixing 3min; Finally add remaining raw material granularity <0.074mm bauxite chamotte, granularity is the Guangxi white clay of <0.074mm silicon carbide and granularity <0.044mm, carries out mixed grind 10min, obtain pug after adding;
C, shaping: the pug compression moulding obtained by step b is adobe, and what adopt during compacting is moulding press, and the tonnage of moulding press is 630T; The volume density being controlled to shaped brick base is 2.45 ~ 2.65g/cm 3;
D, drying: the adobe of step c gained is placed in dry kiln and carries out drying, time of drying is 25h, and dry kiln temperature in is 80 ~ 90 DEG C, and drying temperature is 170 ~ 180 DEG C; Kiln discharge during moisture content < 0.5% in dry rear gained adobe;
E, to burn till: adopt hyperthermia tunnel Kiln or shuttle kiln to burn till gained adobe after drying, firing temperature is 1450 DEG C, is incubated 12h under firing temperature, naturally cools to room temperature kiln discharge after burning till, and obtains product low heat conduction mullite silicon carbide compound brick.
The performance index of products obtained therefrom are: apparent porosity 22.3%, volume density 2.42g/cm 3, cold crushing strength 88.6MPa, refractoriness under load 1580 DEG C, thermal shock resistance (1100 DEG C, water-cooled) is greater than 15 times.

Claims (9)

1. one kind low heat conduction mullite silicon carbide compound brick, it is characterized in that: represent with weight percentage, containing mullite homogeneous material 20 ~ 60% in described low heat conduction mullite silicon carbide compound brick raw material composition, bauxite chamotte 20 ~ 45%, silicon carbide 10 ~ 20%, alumina hollow ball 5 ~ 15%, Guangxi white clay 3 ~ 8%; The additional spent pulping liquor accounting for above-mentioned various raw material gross weight 2 ~ 5%;
Described mullite homogeneous material is formulated according to mass ratio 1:1 ~ 3:0.5 ~ 1 by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities;
Described bauxite chamotte is formulated according to mass ratio 1:2 ~ 3:1 ~ 2:2 ~ 3 by the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities.
2. low heat conduction mullite silicon carbide compound brick according to claim 1, is characterized in that: Al in described mullite homogeneous material 2o 3mass percentage be 68 ~ 72%, volume density ﹥ 2.7g/cm 3.
3. low heat conduction mullite silicon carbide compound brick according to claim 1, is characterized in that: Al in described bauxite chamotte 2o 3mass percentage >83%, volume density >3.0g/cm 3.
4. low heat conduction mullite silicon carbide compound brick according to claim 1, is characterized in that: the granularity <0.074mm of described silicon carbide, the mass percentage >90% of SiC in silicon carbide.
5. low heat conduction mullite silicon carbide compound brick according to claim 1, is characterized in that: the granularity <0.5mm of described alumina hollow ball, Al in alumina hollow ball 2o 3mass percentage >97%.
6. low heat conduction mullite silicon carbide compound brick according to claim 1, is characterized in that: the granularity <0.044mm of described Guangxi white clay, Al in the white clay of Guangxi 2o 3mass percentage >34%.
7. low heat conduction mullite silicon carbide compound brick according to claim 1, is characterized in that: the proportion of described spent pulping liquor is 1.0 ~ 1.6g/cm 3.
8. a preparation method for low heat conduction mullite silicon carbide compound brick, it is characterized in that, described preparation method comprises the following steps:
A, get the raw materials ready: first get the raw materials ready according to the ratio of raw material each described in claim 1, preparation 3mm≤particle diameter < 5mm, the mullite homogeneous material of 1mm≤particle diameter < 3mm and < 1mm tri-kinds of granularities, 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm, the bauxite chamotte of 0.074mm≤particle diameter < 1mm and < 0.074mm tetra-kinds of granularities, the silicon carbide of granularity <0.074mm, the alumina hollow ball of granularity <0.5mm, the Guangxi white clay of granularity <0.044mm and spent pulping liquor,
B, batch mixing: by the mullite homogeneous material of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm of preparing in step a and < 1mm tri-kinds of granularities, the bauxite chamotte of 3mm≤particle diameter < 5mm, 1mm≤particle diameter < 3mm and 0.074mm≤particle diameter < 1mm tri-kinds of granularities and the alumina hollow ball of <0.5mm are as aggregate, pour in edgd runner and be dry mixed 3 ~ 5min, obtain dry blend; Then in gained dry blend, add spent pulping liquor, add rear batch mixing 2 ~ 3min; Finally add remaining raw material granularity <0.074mm bauxite chamotte, granularity is the Guangxi white clay of <0.074mm silicon carbide and granularity <0.044mm, carry out mixed grind 5 ~ 10min after adding, obtain pug;
C, shaping: the pug compression moulding obtained by step b is adobe, and the volume density being controlled to shaped brick base is 2.45 ~ 2.65g/cm 3;
D, drying: the adobe of step c gained is placed in dry kiln and carries out drying, time of drying is 20 ~ 50h, and dry kiln temperature in is 45 ~ 90 DEG C, and drying temperature is 110 ~ 180 DEG C; Kiln discharge during moisture content < 0.5% in dry rear gained adobe;
E, to burn till: adopt hyperthermia tunnel Kiln or shuttle kiln to burn till gained adobe after drying, firing temperature is 1350 ~ 1450 DEG C, be incubated 10 ~ 20h under firing temperature, naturally cool to room temperature kiln discharge after burning till, obtain product low heat conduction mullite silicon carbide compound brick.
9. the preparation method of low heat conduction mullite silicon carbide compound brick according to claim 8, it is characterized in that: the compression moulding of pug described in step c is adobe, what adopt during compacting is moulding press, and the tonnage of moulding press is 630T.
CN201510856961.7A 2015-11-30 2015-11-30 Mullite silicon carbide composite brick with low thermal conductivity and preparation method thereof Pending CN105294133A (en)

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CN106187235A (en) * 2016-07-20 2016-12-07 武汉钢铁股份有限公司 A kind of half heavy coke dry quenching furnace annular passage refractory brick and preparation method
CN107200592A (en) * 2017-05-19 2017-09-26 河南瑞泰耐火材料科技有限公司 A kind of lightweight is ultralow to lead mullite brick and preparation method thereof
CN107244906A (en) * 2017-06-15 2017-10-13 郑州瑞泰耐火科技有限公司 Aluminium titanates calcium compound abrasive brick and preparation method thereof
CN108675804A (en) * 2018-06-08 2018-10-19 郑州凯翔耐火材料有限公司 A kind of highly heatproof and shockproof mullite brick and its production technology
CN109111215A (en) * 2018-08-29 2019-01-01 通达耐火技术股份有限公司 A kind of cement rotary kiln low aluminum silicon not brick and preparation method thereof
CN110423104A (en) * 2019-08-21 2019-11-08 郑州明珠实业有限公司 A kind of alumina bubble brick and preparation method thereof

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CN102701763A (en) * 2012-06-08 2012-10-03 安徽瑞泰新材料科技有限公司 Low-aluminum sintered alumina-silica refractory material and preparation method thereof
CN103755363A (en) * 2013-12-27 2014-04-30 郑州汇特耐火材料有限公司 Lightweight siliceous mullite composite brick and preparation method thereof
CN103922766A (en) * 2014-03-21 2014-07-16 通达耐火技术股份有限公司 Mullite brick used for furnace bottom of COREX furnace and its production method

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CN102079658A (en) * 2010-09-21 2011-06-01 王强 Method for manufacturing high-strength ultra wear-resistant precast brick
CN102701763A (en) * 2012-06-08 2012-10-03 安徽瑞泰新材料科技有限公司 Low-aluminum sintered alumina-silica refractory material and preparation method thereof
CN103755363A (en) * 2013-12-27 2014-04-30 郑州汇特耐火材料有限公司 Lightweight siliceous mullite composite brick and preparation method thereof
CN103922766A (en) * 2014-03-21 2014-07-16 通达耐火技术股份有限公司 Mullite brick used for furnace bottom of COREX furnace and its production method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106187235A (en) * 2016-07-20 2016-12-07 武汉钢铁股份有限公司 A kind of half heavy coke dry quenching furnace annular passage refractory brick and preparation method
CN107200592A (en) * 2017-05-19 2017-09-26 河南瑞泰耐火材料科技有限公司 A kind of lightweight is ultralow to lead mullite brick and preparation method thereof
CN107200592B (en) * 2017-05-19 2019-11-22 河南瑞泰耐火材料科技有限公司 A kind of lightweight is ultralow to lead mullite brick and preparation method thereof
CN107244906A (en) * 2017-06-15 2017-10-13 郑州瑞泰耐火科技有限公司 Aluminium titanates calcium compound abrasive brick and preparation method thereof
CN108675804A (en) * 2018-06-08 2018-10-19 郑州凯翔耐火材料有限公司 A kind of highly heatproof and shockproof mullite brick and its production technology
CN109111215A (en) * 2018-08-29 2019-01-01 通达耐火技术股份有限公司 A kind of cement rotary kiln low aluminum silicon not brick and preparation method thereof
CN110423104A (en) * 2019-08-21 2019-11-08 郑州明珠实业有限公司 A kind of alumina bubble brick and preparation method thereof

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Application publication date: 20160203