CN101708997B - Alumina light-weight brick and preparation method thereof - Google Patents

Alumina light-weight brick and preparation method thereof Download PDF

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Publication number
CN101708997B
CN101708997B CN2009102727397A CN200910272739A CN101708997B CN 101708997 B CN101708997 B CN 101708997B CN 2009102727397 A CN2009102727397 A CN 2009102727397A CN 200910272739 A CN200910272739 A CN 200910272739A CN 101708997 B CN101708997 B CN 101708997B
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micro mist
preparation
alumina
weight brick
weight percent
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CN101708997A (en
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李远兵
李晓星
赵雷
吴清顺
李亚伟
黄凯
李绍康
冯斌
金胜利
李淑静
桑绍柏
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Wuhan University of Science and Engineering WUSE
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Wuhan University of Science and Engineering WUSE
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Abstract

The invention relates to an alumina light-weight brick and a preparation method thereof. The method adopts the technical scheme that: 50 to 80 weight percent of Al2O3 fine powder, 15 to 30 weight percent of alpha-Al2O3 micro-powder and 5 to 20 weight percent of rho-Al2O3 micro-powder serving as raw materials are mixed with 0.1 to 1 weight percent of sintering aid, 30 to 50 weight percent of water, 0.1 to 1 weight percent of water reducer and 0.1 to 2 weight percent of SiO2 for 3 to 5 minutes; furthermore, the mixture and 0.2 to 0.4 weight percent of foaming agent are mixed uniformly, and are cast and molded; and the mold is sintered at the temperature of between 1,450 and 1,700 DEG C after being dried, and is insulated for 3 to 5 hours. The method has the characteristics of simple process and energy conservation; and the prepared alumina light-weight brick has the volume density of between 0.6 and 1.1g/cm3, the heat conductivity of between 0.2 and 0.6w/(m.k) and the compression strength of 5 to 15Mpa, and has the advantages of higher strength, small volume density and low heat conductivity compared with hollow ball products.

Description

A kind of alumina light-weight brick and preparation method thereof
Technical field
The invention belongs to the lightweight refractory technical field, be specifically related to a kind of alumina light-weight brick and preparation method thereof.
Background technology
Save energy is one of economic important measures that keep Sustainable development.The insulation thermal insulation then is one of energy-conservation important measures, thereby the heat-insulation and heat-preservation material with micro-nano hole has consequence in the heat-insulation and heat-preservation field.Lagging material is meant the material that void content is high, volume density is low, thermal conductivity is low.For at various atmosphere (air, H 2, N 2And CO etc.) under, satisfy the high-temperature heat treatment process requirement of metal, nonmetal and goods, and reduce energy consumption, many scientific and technical personnel are devoted to the light heat-insulating material that research is used down at high temperature (1750-1800 ℃).High-strength, ultralight, low heat conduction also are the developing direction of domestic and international light cinder brick always.
At present, in the existing various lagging materials, aluminum oxide lagging material kind is maximum, and use temperature is high, heat-insulating and energy-saving is effective, is the lagging material of giving priority to now.The preparation method of lagging material has a lot, mainly contains after-flame admixture method, foaming process, gas evolution method, porous material method etc.After-flame admixture method is to adopt combustiblematerialss such as sawdust, wood chip, the porous plastics ball additive that maybe can distil to introduce pore; Foaming process is to introduce pore through foaming agent foaming back with the slurry blend; Gas evolution method then produces gas through chemical reaction and introduces pore; The porous material rule is to utilize natural lightweight material or made various hollow ball to introduce hole; Above-mentioned the whole bag of tricks respectively has its relative merits.Like " a kind of preparation method who prepares high-strength light alumina hollow ball pottery " (CN200310122906.2) patented technology, set forth a kind of working method of alumina light-weight brick, this method is aggregate, α-Al with the alumina hollow ball 2O 3Micro mist is that matrix, phosphoric acid solution are wedding agent, the vibration extrusion forming.The main drawback of this method is embodied in: (1) this method restricted application; (2) preparation of alumina hollow ball need consume mass energy, and energy consumption is high; (3) this small product size density is bigger, and thermal conductivity is higher.
Summary of the invention
The purpose of this invention is to provide that a kind of manufacture craft is simple, the preparation method of the alumina light-weight brick of save energy.Have the advantages that with the prepared alumina light-weight brick of this method intensity is higher, volume density is little and thermal conductivity is low.
For realizing above-mentioned purpose, the technical scheme that the present invention adopted is: with the Al of 50～80wt% 2O 3α-Al of fine powder, 15～30wt% 2O 3ρ-Al of micro mist and 5～20wt% 2O 3Micro mist is a raw material, adds the sintering agent of 0.1～1wt%, the water of 30～50wt%, the water reducer of 0.1～1wt% and the SiO of 0.1～2wt% 2, mixed 3～5 minutes, add the foaming agent of 0.2～0.4wt% again, mix, casting, burn till under 1450～1700 ℃ condition dry back, is incubated 3～5 hours.
Wherein: Al 2O 3Fine powder or be α-Al 2O 3Fine powder or be the commercial alumina fine powder, its granularity is 200 orders; Sintering agent is TiO 2Micro mist, MgO micro mist, Cr 2O 3Micro mist, MgF 2, a kind of in the boric acid; Water reducer is a kind of in polycarboxylic acids dehydragent, tripoly phosphate sodium STPP, Lignins water reducer, the naphthalene water reducer; SiO 2A kind of in nano silicon, fine silica powder, the silicon sol; Foaming agent is made up of X 2073, rosined soap, sorbitan mono-oleic acid ester and polyoxyethylenated alcohol sodium sulfate, and foaming agent is prepared into foam in use earlier.
Because adopt technique scheme, the present invention need not labor Energy production hollow ball, operating procedure is simple; Because the foam that mixes in this material possesses high tenacity, homogeneity, dispersiveness and small-bore property, will in material, form the aperture that seals in a large number and be evenly distributed in addition, gas molecule is difficult to collision each other, and the result will make material thermal conductivity lower greatly; The a large amount of pores that form also make material have lower volume density, and in general, the pore of material is many more, and the intensity of material can be more little, but because the pore that this foam forms is little, and be evenly distributed, thereby make material that higher relatively intensity arranged.The volume density of prepared alumina light-weight brick is 0.6～1.1g/cm 3, thermal conductivity is 0.2～0.6w/ (m.k), compressive strength reaches 5～15Mpa.
Therefore, the present invention has that technology is simple, the characteristics of save energy, and prepared alumina light-weight brick has the advantage that intensity is higher, volume density is little and thermal conductivity is low with respect to hollow ball product.
Embodiment
Below in conjunction with embodiment the present invention being done further description, is not the restriction to its protection domain:
For avoiding repetition, earlier with this embodiment to relate to relevant raw material and admixture the common feature unification be described below, will not give unnecessary details among the embodiment: Al 2O 3The granularity of fine powder is 200 orders; Foaming agent is made up of X 2073, rosined soap, sorbitan mono-oleic acid ester and polyoxyethylenated alcohol sodium sulfate, and foaming agent is prepared into foam in use earlier.' embodiment 1:
A kind of alumina light-weight brick and preparation method thereof.α-Al with 50～55wt% 2O 3α-Al of fine powder, 25～30wt% 2O 3ρ-Al of micro mist and 15～20wt% 2O 3Micro mist is a raw material, adds the TiO of 0.1～0.3wt% 2The fine silica powder of the water of micro mist, 30～35wt%, the polycarboxylic acids dehydragent of 0.1～0.3wt% and 0.1～0.5wt% mixed 3～5 minutes, added the foaming agent of 0.2～0.3wt% again; Mix, casting, burn till under 1450～1550 ℃ condition dry back, is incubated 3～5 hours.
The volume density of present embodiment 1 prepared alumina light-weight brick is 0.7～1.0g/cm 3, thermal conductivity is 0.2～0.5w/ (m.k), compressive strength reaches 5～15Mpa.
Embodiment 2:
A kind of alumina light-weight brick and preparation method thereof.α-Al with 55～65wt% 2O 3α-Al of fine powder, 20～25wt% 2O 3ρ-Al of micro mist and 10～20wt% 2O 3Micro mist is a raw material; Add the MgO micro mist of 0.3～0.5wt%, the water of 35～40wt%, the Lignins water reducer of 0.1～0.3wt% and the silicon sol of 0.5～1wt%, mixed 3～5 minutes, add the foaming agent of 0.3～0.4wt% again; Mix; Casting, burn till under 1550～1600 ℃ condition dry back, is incubated 3～5 hours.
The volume density of present embodiment 2 prepared alumina light-weight bricks is 0.8～1.0g/cm 3, thermal conductivity is 0.3～0.5w/ (m.k), compressive strength reaches 6～15Mpa.
Embodiment 3:
A kind of alumina light-weight brick and preparation method thereof.α-Al with 60～65wt% 2O 3α-Al of fine powder, 15～25wt% 2O 3ρ-Al of micro mist and 10～20wt% 2O 3Micro mist is a raw material, adds the Cr of 0.1～0.5wt% 2O 3The how based water reducer of the water of micro mist, 40～45wt%, 0.1～0.5wt% and the nano silicon of 0.1～1wt% mixed 3～5 minutes, added the foaming agent of 0.3～0.4wt% again; Mix; Casting, burn till under 1600～1650 ℃ condition dry back, is incubated 3～5 hours.
The volume density of present embodiment 3 prepared alumina light-weight bricks is 0.7～0.9g/cm 3, thermal conductivity is 0.2～0.5w/ (m.k), compressive strength reaches 6～12Mpa.
Embodiment 4:
A kind of alumina light-weight brick and preparation method thereof.α-Al with 65～70wt% 2O 3α-Al of fine powder, 15～25wt% 2O 3ρ-Al of micro mist and 5～15wt% 2O 3Micro mist is a raw material, adds the TiO of 0.5～1wt% 2The fine silica powder of the water of micro mist, 45～50wt%, the tripoly phosphate sodium STPP of 0.1～0.5wt% and 1～2wt% mixed 3～5 minutes, added the foaming agent of 0.2～0.3wt% again; Mix; Casting, burn till under 1650～1700 ℃ condition dry back, is incubated 3～5 hours.
The volume density of present embodiment 4 prepared alumina light-weight bricks is 0.7～1.0g/cm 3, thermal conductivity is 0.2～0.4w/ (m.k), compressive strength reaches 6～15Mpa.
Embodiment 5:
A kind of alumina light-weight brick and preparation method thereof.α-Al with 70～75wt% 2O 3α-Al of fine powder, 15～25wt% 2O 3ρ-Al of micro mist and 5～10wt% 2O 3Micro mist is a raw material; Add the MgO micro mist of 0.1～0.5wt%, the water of 45～50wt%, the tripoly phosphate sodium STPP of 0.5～1wt% and the silicon sol of 0.1～1wt%, mixed 3～5 minutes, add the foaming agent of 0.3～0.4wt% again; Mix; Casting, burn till under 1650～1700 ℃ condition dry back, is incubated 3～5 hours.
The volume density of present embodiment 5 prepared alumina light-weight bricks is 0.6～1.0g/cm 3, thermal conductivity is 0.2～0.5w/ (m.k), compressive strength reaches 5～12Mpa.
Embodiment 6:
A kind of alumina light-weight brick and preparation method thereof.α-Al with 75～80wt% 2O 3α-Al of fine powder, 15～20wt% 2O 3ρ-Al of micro mist and 5～10wt% 2O 3Micro mist is a raw material, adds the Cr of 0.5～1wt% 2O 3The silicon sol of the water of micro mist, 40～45wt%, the polycarboxylic acids dehydragent of 0.1～0.5wt% and 1～1.5wt% mixed 3～5 minutes, added the foaming agent of 0.2～0.3wt% again; Mix; Casting, burn till under 1550～1600 ℃ condition dry back, is incubated 3～5 hours.
The volume density of present embodiment 6 prepared alumina light-weight bricks is 0.7～1.0g/cm 3, thermal conductivity is 0.2～0.6w/ (m.k), compressive strength reaches 6～12Mpa.
Embodiment 7:
A kind of alumina light-weight brick and preparation method thereof.With the commercial alumina fine powder of 50～60wt%, α-Al of 25～30wt% 2O 3
ρ-Al of micro mist and 15～20wt% 2O 3Micro mist is a raw material; Add how based water reducer and the fine silica powder of 0.1～1wt% of water, the 0.1～0.3wt% of MgO micro mist, the 35～40wt% of 0.1～0.5wt%, mixed 3～5 minutes, add the foaming agent of 0.3～0.4wt% again; Mix; Casting, burn till under 1550～1600 ℃ condition dry back, is incubated 3～5 hours.
The volume density of present embodiment 7 prepared alumina light-weight bricks is 0.6～1.0g/cm 3, thermal conductivity is 0.2～0.5w/ (m.k), compressive strength reaches 6～14Mpa.
Embodiment 8:
A kind of alumina light-weight brick and preparation method thereof.With the commercial alumina fine powder of 60～70wt%, α-Al of 15～25wt% 2O 3ρ-Al of micro mist and 5～15wt% 2O 3Micro mist is a raw material; Add the boric acid of 0.5～1wt%, the water of 40～50wt%, the polycarboxylic acids dehydragent of 0.5～1wt% and the nano silicon of 0.1～1wt%, mixed 3～5 minutes, add the foaming agent of 0.2～0.3wt% again; Mix; Casting, burn till under 1650～1700 ℃ condition dry back, is incubated 3～5 hours.
The volume density of present embodiment 8 prepared alumina light-weight bricks is 0.7～1.1g/cm 3, thermal conductivity is 0.2～0.5w/ (m.k), compressive strength reaches 5～15Mpa.
Embodiment 9:
A kind of alumina light-weight brick and preparation method thereof.With the commercial alumina fine powder of 70～75wt%, α-Al of 15～20wt% 2O 3ρ-Al of micro mist and 5～15wt% 2O 3Micro mist is a raw material, adds the TiO of 0.1～0.5wt% 2The fine silica powder of the water of micro mist, 40～50wt%, the tripoly phosphate sodium STPP of 0.1～0.5wt% and 1～2wt% mixed 3～5 minutes, added the foaming agent of 0.2～0.3wt% again; Mix; Casting, burn till under 1550～1600 ℃ condition dry back, is incubated 3～5 hours.
The volume density of present embodiment 9 prepared alumina light-weight bricks is 0.6～1.1g/cm 3, thermal conductivity is 0.2～0.5w/ (m.k), compressive strength reaches 5～10Mpa.
Embodiment 10:
A kind of alumina light-weight brick and preparation method thereof.With the commercial alumina fine powder of 75～80wt%, α-Al of 15～20wt% 2O 3ρ-Al of micro mist and 5～10wt% 2O 3Micro mist is a raw material, adds the MgF of 0.5～1wt% 2The silicon sol of the water of micro mist, 30～40wt%, the polycarboxylic acids dehydragent of 0.1～0.5wt% and 0.5～1wt% mixed 3～5 minutes, added the foaming agent of 0.3～0.4wt% again; Mix; Casting, burn till under 1650～1700 ℃ condition dry back, is incubated 3～5 hours.
The volume density of present embodiment 10 prepared alumina light-weight bricks is 0.7～1.0g/cm 3, thermal conductivity is 0.2～0.6w/ (m.k), compressive strength reaches 6～12Mpa.
This embodiment need not labor Energy production hollow ball, and operating procedure is simple; Because the foam that mixes in this material possesses high tenacity, homogeneity, dispersiveness and small-bore property, will in material, form the aperture that seals in a large number and be evenly distributed in addition, gas molecule is difficult to collision each other, and the result will make material thermal conductivity lower greatly; The a large amount of pores that form also make material have lower volume density, and in general, the pore of material is many more, and the intensity of material can be more little, but because the pore that this foam forms is little, and be evenly distributed, thereby make material that higher relatively intensity arranged.The volume density of prepared alumina light-weight brick is 0.6～1.1g/cm 3, thermal conductivity is 0.2～0.6w/ (m.k), compressive strength reaches 5～15Mpa.
Therefore, this embodiment has that technology is simple, the characteristics of save energy, and prepared alumina light-weight brick has the advantage that intensity is higher, volume density is little and thermal conductivity is low with respect to hollow ball product.

Claims (5)

1. the preparation method of an alumina light-weight brick is characterized in that the Al with 50～80wt% 2O 3α-Al of fine powder, 15～30wt% 2O 3ρ-Al of micro mist and 5～20wt% 2O 3Micro mist is a raw material, adds the sintering agent of said raw material 0.1～1wt%, the water of 30～50wt%, the water reducer of 0.1～1wt% and the SiO of 0.1～2wt% 2, mixed 3～5 minutes, add the foaming agent of said raw material 0.2～0.4wt% again, mix, casting, burn till under 1450～1700 ℃ condition dry back, is incubated 3～5 hours;
Said foaming agent is made up of X 2073, rosined soap, sorbitan mono-oleic acid ester and polyoxyethylenated alcohol sodium sulfate; Foaming agent is prepared into foam in use earlier;
Described Al 2O 3Fine powder or be α-Al 2O 3Fine powder or be the commercial alumina fine powder, its granularity is 200 orders.
2. the preparation method of alumina light-weight brick according to claim 1 is characterized in that described sintering agent is TiO 2Micro mist, MgO micro mist, Cr 2O 3Micro mist, MgF 2, a kind of in the boric acid.
3. the preparation method of alumina light-weight brick according to claim 1 is characterized in that described water reducer is a kind of in polycarboxylic acids dehydragent, tripoly phosphate sodium STPP, Lignins water reducer, the naphthalene water reducer.
4. the preparation method of alumina light-weight brick according to claim 1 is characterized in that described SiO 2A kind of in nano silicon, fine silica powder, the silicon sol.
5. according to the prepared alumina light-weight brick of preparation method of each described alumina light-weight brick in the claim 1～4.
CN2009102727397A 2009-11-10 2009-11-10 Alumina light-weight brick and preparation method thereof Expired - Fee Related CN101708997B (en)

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CN101891369B (en) * 2010-08-03 2012-04-18 瑞泰科技股份有限公司 Fused cast alpha-beta alumina cylindrical brick and production method thereof
CN102167621B (en) * 2011-01-21 2013-04-17 武汉科技大学 Aluminum oxide hollow sphere light insulating brick and preparation method thereof
CN102372489A (en) * 2011-08-05 2012-03-14 海城市中兴高档镁质砖有限公司 Production method of waterproof magnesite brick
CN103848637A (en) * 2012-11-28 2014-06-11 宝山钢铁股份有限公司 Steel ladle light-weight heat-insulating brick and preparation method thereof
CN103044065B (en) * 2012-12-28 2014-05-14 武汉理工大学 Porous oxide ceramic heat insulating material for kilns and preparation method of porous oxide ceramic heat insulating material
CN103044045B (en) * 2013-01-17 2014-06-18 武汉科技大学 High-strength aluminum oxide light-weight heat insulation brick and preparation method thereof
CN103044044A (en) * 2013-01-17 2013-04-17 武汉科技大学 Lightweight aluminum oxide castable and preparation method thereof
CN104310970B (en) * 2014-09-27 2017-01-11 景德镇陶瓷大学 A method of enhancing thermal shock resistance of a fully-dense high-aluminum ceramic material and a product prepared by the method
CN104860706A (en) * 2015-05-07 2015-08-26 姜捷 Rice hull ash foam brick and manufacturing method thereof
CN105036715B (en) * 2015-07-09 2017-12-12 山东大东联石油设备有限公司 A kind of aluminium chrome refractory and preparation method thereof
CN110937882A (en) * 2019-12-17 2020-03-31 中国铝业股份有限公司 Alumina light heat-insulating material and preparation method thereof
CN115231908A (en) * 2022-07-05 2022-10-25 洛阳欧斯特建材有限公司 High-purity alumina brick for preparing lithium battery anode material kiln and preparation method thereof

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