CN109650854A - Corundum-mullite composite brick and preparation method thereof - Google Patents

Corundum-mullite composite brick and preparation method thereof Download PDF

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Publication number
CN109650854A
CN109650854A CN201811592572.8A CN201811592572A CN109650854A CN 109650854 A CN109650854 A CN 109650854A CN 201811592572 A CN201811592572 A CN 201811592572A CN 109650854 A CN109650854 A CN 109650854A
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Prior art keywords
parts
mullite
brick
aggregate
mesh
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CN201811592572.8A
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Inventor
宋金标
宋彩虹
付鸿正
于建伟
周红丽
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ZHENGZHOU ZHENJIN REFRACTORY CO Ltd
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ZHENGZHOU ZHENJIN REFRACTORY CO Ltd
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Priority to CN201811592572.8A priority Critical patent/CN109650854A/en
Publication of CN109650854A publication Critical patent/CN109650854A/en
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/101—Refractories from grain sized mixtures
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
    • C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
    • C04B35/185—Mullite 3Al2O3-2SiO2
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • F27D1/06—Composite bricks or blocks, e.g. panels, modules
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    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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Abstract

The invention discloses a kind of corundum-mullite composite bricks, including flame retardant coating and thermal insulation layer；Flame retardant coating is electric smelting or 20-40 parts of fused mullite by 35 ~ 75 parts of raw material white fused alumina, and 15 ~ 25 parts of andalusite, 1 ~ 5 part of a alumina powder, 1 ~ 5 part of clay powder, 0.2 ~ 1.5 part of dextrin, 3 ~ 5 parts of industrial phosphoric acid are formulated；Thermal insulation layer is by 20 ~ 40 parts of raw material light-weight mullite, and 3 ~ 0mm poly light mullite gives up 10 ~ 20 parts of brick, and 10 ~ 20 parts of calcined kaolin, 1 ~ 5 part of a alumina powder, three 5 ~ 15 parts of mountain flours, 1 ~ 5 part of sodium bentonite, 5 ~ 10 parts and 3 ~ 5 parts of lignin liquor of clay powder are formulated.Refractory brick prepared by the present invention is made of refractory layer and thermal insulation layer two parts, working lining and the existing obvious differentiation of thermal insulation layer are realized again and are combined closely, make one piece of brick body while having both the high temperature resistant of corundum-mullite brick, cold crushing strength height, good thermal shock stability, the low dual characteristics that can effectively reduce kiln barrel temperature of characteristic and insulating brick thermal coefficient that refractoriness under load is high, corrosion resistance is strong, achieve the purpose that energy-saving.

Description

Corundum-mullite composite brick and preparation method thereof
Technical field
The present invention relates to refractory brick, compound more particularly, to a kind of corundum-mullite suitable for building revolution kiln hood Brick, the invention further relates to the preparation methods of the composite brick.
Background technique
Corundum mullite refractory is due to having the excellent performances such as high temperature resistant, corrosion-resistant, high abrasion, anti-thermal shock, Success replaces corundum based refractory materials to be widely applied in many industries.But due to the high-temperature behavior of refractory material, body Relationship between product density, intensity and thermal conductivity is proportional, i.e. the bulk density of refractory material is higher, and intensity is higher, then thermally conductive Coefficient is higher, so corundum-mullite brick is while having good high-temperature behavior and higher thermal shock resistance, density is high, The functional defect that thermal conductivity is high, coefficient of thermal expansion is high is also following.
Though existing corundum-mullite brick has compressive resistance height, good, the wear-resistant, good thermal shock stability of erosion-resisting characteristics etc. Feature, but thermal coefficient it is higher be the product maximum drawback.Due to revolution kiln hood all it is exposed in air, fire resisting Brick thermal coefficient will be excessively high so that cylinder of rotary kiln is increased, increase fuel consumption, result in waste of resources so that production and use at Originally it remains high.
Summary of the invention
The purpose of the present invention is to provide a kind of corundum-mullite composite brick, the composite brick have both corundum-mullite brick and every Hot brick dual characteristics, can significantly reduce kiln barrel temperature, achieve the purpose that energy-saving, and the present invention also provides the composite bricks Preparation method.
To achieve the above object, the present invention can take following technical proposals:
Corundum-mullite composite brick of the present invention, including flame retardant coating and thermal insulation layer；
The flame retardant coating is electric smelting or 20-40 parts of fused mullite by 35 ~ 75 parts of raw material white fused alumina, 15 ~ 30 parts of andalusite, 800 ~ 1,200 1 ~ 5 part of mesh a alumina powders, 200 1 ~ 5 part of mesh clay powders, 0.2 ~ 1.5 part of dextrin, 3 ~ 5 parts of industrial phosphoric acid are formulated；Its In
5 ~ 15 parts of 5 ~ 3mm white fused alumina aggregate, 10 ~ 20 parts of 3 ~ 1mm white fused alumina aggregate, 10 ~ 20 parts of 1 ~ 0mm white fused alumina aggregate, 325 mesh 10 ~ 20 parts of white alundum powder；
10 ~ 20 parts of 3 ~ 1mm mullite aggregate, 10 ~ 20 parts of 1 ~ 0mm mullite aggregate；
5 ~ 10 parts of 3 ~ 1mm andalusite aggregate, 5 ~ 10 parts of 1 ~ 0mm andalusite aggregate, 200 5 ~ 10 parts of mesh andalusite powders；
The thermal insulation layer is by 20 ~ 40 parts of raw material light-weight mullite, and 3 ~ 0mm poly light mullite gives up 10 ~ 20 parts of brick, the calcining of 200 mesh 10 ~ 20 parts of kaolin, 600 1 ~ 5 part of mesh a alumina powders, three 5 ~ 15 parts of mountain flours, 200 1 ~ 5 part of mesh sodium bentonites, 200 mesh clays 5 ~ 10 parts and 3 ~ 5 parts of lignin liquor of powder are formulated；Wherein 10 ~ 20 parts of the light-weight mullite aggregate of 4 ~ 2mm, 2 ~ 1mm's is light 10 ~ 20 parts of matter mullite aggregate.
The useless brick of poly light mullite used in the present invention is that the waste and old brick body that Industrial Stoves are removed can be dropped as brick body raw material The manufacturing cost of low brick body improves the comprehensive utilization ratio of resource.
For the use demand for meeting cylinder of rotary kiln, the flame retardant coating for the finished product brick body prepared and the thickness ratio of thermal insulation layer are 2:1 or so；The faying face of flame retardant coating and thermal insulation layer is arranged to interlocking, it is ensured that the bond strength of whole brick.Practical system When standby, the thickness ratio of flame retardant coating and thermal insulation layer can also be adjusted according to actual use occasion (specific kiln).
Corundum-mullite composite brick of the present invention the preparation method comprises the following steps: flame retardant coating raw material and thermal insulation layer raw material are used respectively first Edge runner-wet mill is kneaded into uniform pug, then two kinds of pugs is filled into respectively, inner cavity is divided into two-part mold by plate, It extracts plate out, semi-finished product adobe is compressed on press machine, after 110 DEG C dry, under weakly reducing atmosphere, enter tunnel oven 1200 ~ 1600 DEG C are warming up to, after firing 6 ~ 10 hours, obtains finished product brick body through natural cooling.
The finished product brick body of preparation is tested；
The chemical component mass percent of flame retardant coating are as follows: Al2O3 65-75%；SiO225-30%；Fe2O3, other impurity such as CaO at Part total amount is 1 ~ 2%；Apparent porosity≤17%, bulk density >=2.80g/cm3, cold crushing strength >=80Mpa, 1100 DEG C of water Cold process surveys thermal shock resistance >=30 time, refractoriness under load >=1700 DEG C T0.6；
The chemical component mass percent of thermal insulation layer are as follows: Al2O3 45-65%, SiO235-55%, Fe2O3, other impurity such as CaO at Part total amount is 1 ~ 2.5%；Apparent porosity >=30%, 1.6 ~ 1.8g/cm of bulk density3, cold crushing strength >=30Mpa, 1400 DEG C X24h reheating linear change rate on reheating≤0.4%, 1200 DEG C thermal coefficient≤0.75%.
Refractory brick prepared by the present invention is made of refractory layer and thermal insulation layer two parts, working lining and the existing obvious area of thermal insulation layer Divide to realize again and combine closely, make one piece of brick body while having both the high temperature resistant of corundum-mullite brick, cold crushing strength height, thermal shock Stability is good, and the characteristic and insulating brick thermal coefficient that refractoriness under load is high, corrosion resistance is strong are low to can effectively reduce kiln cylinder The dual characteristics of temperature achieve the purpose that energy-saving.
The flame retardant coating of brick body of the present invention is mainly primary raw material (mesh by white fused alumina, electric smelting or fused mullite and andalusite Realization cold crushing strength height, good thermal shock stability, refractoriness under load is high, corrosion resistance is strong), thermal insulation layer with lightweight not Come half light materials such as stone, calcined kaolin, useless poly light mullite brick be primary raw material (purpose is to obtain the higher porosity, Further decrease the bulk density and thermal coefficient of brick body thermal insulation layer), pass through separated charging, the side of high-pressure molding, high temperature sintering Formula, corundum mullite rock and half light material, which are concentrated, becomes an entirety, make product have corundum-mullite brick high temperature resistant, It is also equipped with lower thermal conductivity while high intensity, high thermal shock performance, integrates fire resisting, high-strength, anti-thermal shock and heat insulating function, Barrel temperature can be reduced while meeting user to refractory brick high-temperature behavior demand, reduced kiln lining weight, reduced operation Load effectively makes up the high disadvantage of corundum-mullite brick thermal conductivity, meet user requirement fire resistance it is good with it is energy-saving Dual requirements.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of composite brick of the present invention.
Specific embodiment
More detailed explanation is done to the present invention below by specific embodiment, in order to the reason of those skilled in the art Solution.
It unless otherwise specified, is that common synthesis is light the raw materials used present invention is marketable material, such as light-weight mullite aggregate Matter mullite, three mountain flours are commercially available kyanite, sillimanite and andalusite race powder (200 mesh).And the useless brick of poly light mullite is then The waste product that Industrial Stoves are removed, the present invention, which uses poly light mullite to give up brick as raw material, can be effectively reduced cost, mention simultaneously High comprehensive utilization of resources efficiency.
Embodiment 1 prepares the kilns corundum-mullite composite brick such as Zinc volatilization kiln, nickel rotary kiln
1, it stocks up:
1.1 flame retardant coating raw materials:
55 parts of white fused alumina: wherein 10 parts of 5 ~ 3mm aggregate, 15 parts of 3 ~ 1mm aggregate, 15 parts of 1 ~ 0mm aggregate, 325 15 parts of powder materials；
10 ~ 20 parts of 3 ~ 1mm mullite aggregate, 10 ~ 20 parts of 1 ~ 0mm mullite aggregate；
5 ~ 10 parts of 3 ~ 1mm andalusite aggregate, 5 ~ 10 parts of 1 ~ 0mm andalusite aggregate, 200 5 ~ 10 parts of mesh andalusite powders；
800 ~ 1,200 5 parts of mesh a alumina powders；
200 5 parts of mesh clay powders；
1.0 parts of dextrin；
Concentration is 5 parts of industrial phosphoric acid of 50 ~ 60%；
1.2 thermal insulation layer raw materials
30 parts of light-weight mullite, wherein 15 parts of the aggregate of 4 ~ 2mm, 15 parts of the aggregate of 2 ~ 1mm；
3 ~ 0mm gives up 15 parts of poly light mullite brick；
200 15 parts of mesh calcined kaolins；
600 5 parts of mesh a alumina powders；
10 parts of 200 mesh, three mountain flour；
200 5 parts of mesh sodium bentonites；
200 10 parts of mesh clay powders；
5 parts of lignin liquor.
2, preparation method
Flame retardant coating raw material (aggregate and powder) is added to edge runner-wet mill together first and is kneaded (routinely technique progress), obtains flame retardant coating Pug is spare；
Thermal insulation layer raw material (aggregate and powder) is added to edge runner-wet mill together in the same way and is kneaded (routinely technique progress), is obtained Thermal insulation layer pug is spare；
Be put into sawtooth pattern partition by design position in mold cavity, then by flame retardant coating pug and thermal insulation layer pug be filled with respectively into In the mold of partition two sides, semi-finished product adobe is pressed into the pressure not less than 20Mpa with press machine in a mold；Adobe After 110 DEG C of dryings (12-48 hours), tunnel oven to be sent under weakly reducing atmosphere and is warming up to 1200 ~ 1600 DEG C, heat preservation fires 6 ~ Kiln discharge after 10 hours obtains finished product brick body through natural cooling, as shown in Figure 1, brick body overall thickness be 250mm, thermal insulation layer 1 with a thickness of 70mm, the staggeredly faying face height between thermal insulation layer 1 and flame retardant coating 2 is 40mm.
2 finished product brick body performance test of embodiment
After tested:
The chemical component mass percent of flame retardant coating are as follows: Al2O3 70-75%；SiO225-30%；Fe2O3, other impurity such as CaO at Part total amount is 1.5%；Apparent porosity≤17%, bulk density >=2.80g/cm3, cold crushing strength >=80Mpa, 1100 DEG C of water Cold process surveys thermal shock resistance >=30 time, refractoriness under load >=1700 DEG C T0.6；
The chemical component mass percent of thermal insulation layer are as follows: Al2O3 55%, SiO2 43.5%, impurity composition total amount 1.5%；Apparent pore Rate >=30%, 1.6 ~ 1.8g/cm of bulk density3, cold crushing strength >=30Mpa, 1400 DEG C of x24h reheating linear change rate on reheating≤ 0.4%, 1200 DEG C of thermal coefficient≤0.75%.
The light-weight 10-15% of the more traditional corundum-mullite brick used of single brick weight, is built on kiln outer wall, The actual measurement of its kiln skin temperature is 220 DEG C or so (being originally 330 DEG C), and temperature can reduce 90-110 DEG C.
When practical preparation brick body, each raw material dosage can be adjusted in range disclosed by the invention, be to meet needs Preferably.

Claims (4)

1. a kind of corundum-mullite composite brick, it is characterised in that: including flame retardant coating and thermal insulation layer；
The flame retardant coating is electric smelting or 20-40 parts of fused mullite by 35 ~ 75 parts of raw material white fused alumina, 15 ~ 30 parts of andalusite, 800 ~ 1,200 1 ~ 5 part of mesh a alumina powders, 200 1 ~ 5 part of mesh clay powders, 0.2 ~ 1.5 part of dextrin, 3 ~ 5 parts of industrial phosphoric acid are formulated；Its In
5 ~ 15 parts of 5 ~ 3mm white fused alumina aggregate, 10 ~ 20 parts of 3 ~ 1mm white fused alumina aggregate, 10 ~ 20 parts of 1 ~ 0mm white fused alumina aggregate, 325 mesh 10 ~ 20 parts of white alundum powder；
10 ~ 20 parts of 3 ~ 1mm mullite aggregate, 10 ~ 20 parts of 1 ~ 0mm mullite aggregate；
5 ~ 10 parts of 3 ~ 1mm andalusite aggregate, 5 ~ 10 parts of 1 ~ 0mm andalusite aggregate, 200 5 ~ 10 parts of mesh andalusite powders；
The thermal insulation layer is by 20 ~ 40 parts of raw material light-weight mullite, and 3 ~ 0mm poly light mullite gives up 10 ~ 20 parts of brick, the calcining of 200 mesh 10 ~ 20 parts of kaolin, 600 1 ~ 5 part of mesh a alumina powders, three 5 ~ 15 parts of mountain flours, 200 1 ~ 5 part of mesh sodium bentonites, 200 mesh clays 5 ~ 10 parts and 3 ~ 5 parts of lignin liquor of powder are formulated；Wherein 10 ~ 20 parts of the light-weight mullite aggregate of 4 ~ 2mm, 2 ~ 1mm's is light 10 ~ 20 parts of matter mullite aggregate.
2. corundum-mullite composite brick according to claim 1, it is characterised in that: the poly light mullite gives up brick as industry The waste and old brick body that kiln is removed.
3. corundum-mullite composite brick according to claim 1, it is characterised in that: the thickness of the flame retardant coating and thermal insulation layer Than for 2:1, the faying face of the two is indenting.
4. the preparation method of corundum-mullite composite brick described in claim 1, it is characterised in that: first by flame retardant coating raw material and every Thermosphere raw material is kneaded with edge runner-wet mill into uniform pug respectively, then two kinds of pugs is filled into respectively, inner cavity is divided into two by plate It in partial mold, extracts plate out, semi-finished product adobe is compressed on press machine, after 110 DEG C dry, in weak also Primordial Qi Under atmosphere, enters tunnel oven and be warming up to 1200 ~ 1600 DEG C, after firing 6 ~ 10 hours, obtain finished product brick body through natural cooling.
CN201811592572.8A 2018-12-25 2018-12-25 Corundum-mullite composite brick and preparation method thereof Withdrawn CN109650854A (en)

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CN111018547A (en) * 2019-11-07 2020-04-17 浙江锦诚新材料股份有限公司 Light spray coating for blast furnace taphole smoke hood
CN112174651A (en) * 2020-09-28 2021-01-05 山东工业职业学院 Light refractory brick and preparation method thereof
CN112194470A (en) * 2020-09-14 2021-01-08 江苏国豪耐火科技有限公司 Chromium corundum composite brick for rotary kiln of hazardous waste incinerator and preparation method thereof
CN112341221A (en) * 2020-11-11 2021-02-09 广州市白云区石井特种耐火材料厂 Re-sintered electric-melting mullite brick and preparation method and application thereof
CN113173794A (en) * 2021-05-31 2021-07-27 北京金隅通达耐火技术有限公司 Corundum composite brick and preparation method thereof
CN116444256A (en) * 2023-03-10 2023-07-18 安徽瑞泰新材料科技有限公司 Mosi corundum abrasive brick and preparation process thereof

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CN102633512A (en) * 2012-04-12 2012-08-15 武汉科技大学 Abandoned molding sand based mullite light heat insulating bricks and preparation method thereof
CN105669170A (en) * 2016-01-08 2016-06-15 浙江长兴久鑫耐火材料有限公司 Heavy-light composite refractory brick containing burning loss pore-forming agent
CN107117948A (en) * 2017-04-18 2017-09-01 山东耐材集团鲁耐窑业有限公司 Chemical industry dangerous waste incinerator corundum-mullite composite brick and preparation method thereof

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CN102633512A (en) * 2012-04-12 2012-08-15 武汉科技大学 Abandoned molding sand based mullite light heat insulating bricks and preparation method thereof
CN105669170A (en) * 2016-01-08 2016-06-15 浙江长兴久鑫耐火材料有限公司 Heavy-light composite refractory brick containing burning loss pore-forming agent
CN107117948A (en) * 2017-04-18 2017-09-01 山东耐材集团鲁耐窑业有限公司 Chemical industry dangerous waste incinerator corundum-mullite composite brick and preparation method thereof

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111018547A (en) * 2019-11-07 2020-04-17 浙江锦诚新材料股份有限公司 Light spray coating for blast furnace taphole smoke hood
CN111018547B (en) * 2019-11-07 2022-01-28 浙江锦诚新材料股份有限公司 Light spray coating for blast furnace taphole smoke hood
CN112194470A (en) * 2020-09-14 2021-01-08 江苏国豪耐火科技有限公司 Chromium corundum composite brick for rotary kiln of hazardous waste incinerator and preparation method thereof
CN112174651A (en) * 2020-09-28 2021-01-05 山东工业职业学院 Light refractory brick and preparation method thereof
CN112174651B (en) * 2020-09-28 2022-05-10 山东工业职业学院 Light refractory brick and preparation method thereof
CN112341221A (en) * 2020-11-11 2021-02-09 广州市白云区石井特种耐火材料厂 Re-sintered electric-melting mullite brick and preparation method and application thereof
CN113173794A (en) * 2021-05-31 2021-07-27 北京金隅通达耐火技术有限公司 Corundum composite brick and preparation method thereof
CN116444256A (en) * 2023-03-10 2023-07-18 安徽瑞泰新材料科技有限公司 Mosi corundum abrasive brick and preparation process thereof

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