CN102731118B - Corundum micro-pore heat-insulating and fireproof material and preparation method thereof - Google Patents

Abstract

The invention relates to a corundum micro-pore heat-insulating and fireproof material and a preparation method thereof. The contents of raw materials of the corundum micro-pore heat-insulating and fireproof material are as follows: 40-50 wt% of corundum grain, 40-45 wt% of corundum fine powder, 5-10 wt% of active a-aluminum oxide micro-powder and 5-10 wt% r-aluminum oxide micro-powder, an additive, a dispersant account for 0.1-0.5 wt% of the above raw materials, nano aluminum oxide powder accounting for 0.1-1.5 wt% of the above materials and water accounting for 5-10 wt% of the above materials. The preparation method comprises the following steps of: dispersing the nano aluminum oxide powder into the water and dispersing under an ultrasonic vibration condition for 1-5 minutes to prepare a uniform suspension solution; then, gradually dropwise adding the suspension solution into a mixed material, and vibrating and molding; maintaining at a room temperature for 24-48 hours; de-molding and carrying out heat treatment at 1400-1600 DEG C; and keeping the heat for 1-5 hours. The corundum micro-pore heat-insulating and fireproof material and the preparation method thereof have the advantages of simple preparation process and lower energy consumption; a product has the advantages of small average hole diameter, high fireproof degree, great high-temperature resistance, low thermal conductivity and strong anti-corrosion resistance; and the product can be directly applied to a working layer of thermal equipment.

Description

A kind of corundum micropore insulating refractory and preparation method thereof

Technical field

The invention belongs to insulating refractory technical field.Relate in particular to a kind of corundum micropore insulating refractory and preparation method thereof.

Background technology

Along with country improves day by day to energy-saving and cost-reducing requirement, the development of heat insulating refractory materials has obtained development rapidly.Traditional insulating refractory normally reduces the thermal conductivity of material as lightweight corundum brick, diatomite brick and lime feldspar light cinder brick etc. by improving void content, the void content of material is higher, and its physical strength declines.In addition, traditional insulating refractory goods that normally formalize, need mechanical pressing, energy consumption is higher, need in use manually to build by laying bricks or stones, labour intensity is large, its can only be for use temperature position not too high and that directly do not contact with high-temp liquid or other medium, because it is easily subject to erosion and the infiltration (Xu Pingkun of working medium, Dong Yingbang. corundum refractory. Beijing: metallurgical industry press, 1999), affect its work-ing life, even have influence on the production safety of high temperature kiln or container, thereby limited its use.Therefore, the working lining material of the kiln of the hot industries such as ferrous metallurgy or container still be take fine and close mould material at present as main, easy construction when it uses, labour intensity are low, the hot strength of material is high, slag corrosion resistance and penetrating power are strong, but fine and close mould material thermal shock resistance is poor, thermal conductivity is higher, and in use heat loss amount is larger.

Researchist improves on the basis of dense form mould material, invented as " a kind of non-cement light alumina magnesia cast material and preparation method thereof " patented technology (CN200710052468.5), it has adopted porous ceramics particle, by adding silicon powder, guarantee workability and low temperature intensity, avoided as bonding agent causes use temperature, can not too high, easily producing the poor unfavorable factor of structure spalling and slag resistance because take aluminous cement, can apply to the position directly contacting with media such as slags.Yet the void content of the porous ceramics particle that it adopts is high, mean pore size is large (< 30 μ m) still, and energy-conservation need to take slag corrosion resistance and the penetrating quality that weakens material be cost.Meanwhile, in magnalium system, too much silicon powder can make material at high temperature produce too much liquid phase, has a strong impact on the use properties under its high temperature, has limited the use temperature of high purity alumina-magnesia material.

At present, China's hot industry normally adopts with the inner lining material of kiln or container the structure design that adds thermofin in working lining periphery, and working lining is selected fine and close mould material conventionally, and thermofin is selected insulating refractory.This structure design not only makes the liner thickening of kiln or container, thereby has dwindled the volume of kiln or container, and when inner lining material is built by laying bricks or stones or constructed, labour intensity is larger.Therefore, preparing structure heat-insulating integrated furnace lining material can effectively overcome the above problems, as " a kind of corundum structural heat-insulation integrative composite brick and preparation method " (CN101857450A) patented technology, introduced a kind of heavy supporting layer that comprises compact alumina, and take the light heat insulation layer that alumina hollow ball is aglite, the composite brick being composited by two-layer employing vibration pressurization or mechanical pressing, wherein, the length dimension ratio of heavy supporting layer and light heat insulation layer is 1 ~ 5:2 ~ 1.Although the composite brick making has higher refractoriness, higher intensity and thermal and insulating performance preferably, this composite brick needs mechanical pressing, and energy consumption is higher, and this composite brick is when building by laying bricks or stones, hand labor intensity is large, between each fragment of brick, has brickwork joint, and the volume stability of furnace lining is poor.

Summary of the invention

The present invention is intended to overcome prior art defect, and task is to provide the preparation method of the corundum micropore insulating refractory that a kind of manufacture craft is simple, energy consumption is lower.The insulating refractory mean pore size prepared by the method is little, refractoriness is high, hot strength is large, thermal conductivity is low, volume stability is good and corrosion resistance is strong, can be directly used in the working lining of Thermal Equipment, and in use easy construction and labour intensity low.

For completing above-mentioned task, the technical solution adopted in the present invention is: raw material and the content thereof of described corundum micropore insulating refractory are: the corundum in granules of 40 ~ 50wt%, the corundum fine powder of 40 ~ 45wt%, the active α – alumina powder of 5 ~ 10wt%, 5 ~ 10wt% ρ – alumina powder; Admixture and content thereof are: the dispersion agent of above-mentioned raw materials 0.1 ~ 0.5wt%, above-mentioned raw materials 0.1 ~ 1.5wt%'s is nano alumina powder jointed, the water of above-mentioned raw materials 5 ~ 10wt%.

The preparation method of described corundum micropore insulating refractory is: first by the content of raw material and admixture, prepare burden, again by raw material and dispersant, make compound, separately by nano alumina powder jointed, be dispersed in water, under ultra-sonic oscillation condition, disperse 1 ~ 5 minute, be mixed with uniform suspension; Then suspension is dropwise joined in described compound, stir, vibratory compaction, at room temperature maintenance 24 ~ 48 hours, the demoulding, by the idiosome after the demoulding through 110 ~ 200 ℃ dry 10 ~ 24 hours, finally under 1400 ~ 1600 ℃ of conditions, heat-treat, be incubated 1 ~ 5 hour, obtain corundum micropore insulating refractory.

In technique scheme: corundum in granules is a kind of in plate diamond spar particle, white fused alumina particle, brown corundum in granules; The Al of corundum in granules<sub TranNum="78">2</sub>o<sub TranNum="79">3</sub>content is 95 ~ 99wt%, granularity<3mm; Corundum fine powder is one or both in plate diamond spar fine powder, white fused alumina fine powder, brown corundum fine powder; The Al of corundum fine powder<sub TranNum="80">2</sub>o<sub TranNum="81">3</sub>content is 95 ~ 99wt%, and the grain composition ratio of corundum fine powder is: the corundum fine powder that granularity is less than 0.045mm accounts for 40 ~ 50wt%, and the corundum fine powder that granularity is 0.045mm ~ 0.088mm accounts for 50 ~ 60wt%; The Al of active α – alumina powder<sub TranNum="82">2</sub>o<sub TranNum="83">3</sub>content>99wt%, granularity is less than 0.009mm; The Al of active ρ-alumina powder<sub TranNum="84">2</sub>o<sub TranNum="85">3</sub>content>99wt%, granularity is less than 0.003mm; Dispersion agent is one or both in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and polyoxyethylene glycol; The Al of nano aluminium oxide<sub TranNum="86">2</sub>o<sub TranNum="87">3</sub>content is>99wt%, granularity is less than 100nm.

Owing to adopting technique scheme, the present invention is incorporated in corundum pouring material nano alumina powder jointed, and preparation technology is simple, energy consumption is lower.It is main raw material that this mould material system is selected corundum, in use without low melt-phase, produces, and refractoriness is high.Utilize active ρ-alumina powder and water that hydration reaction occurs at normal temperatures, generate bayerite and boehmite colloidal sol, produce early strength, at high temperature there is dehydration reaction and generate activated alumina in its hydrated product, produce a large amount of micropores simultaneously; On the other hand, the nano alumina powder jointed effect that can play refinement pore of introducing, and form a large amount of submicron orders and nano level pore, the pore of this scope size can reduce the thermal conductivity of material, thermosteresis in high temperature kiln or container is reduced greatly, improved material to the anti-erosion of high-temperature liquid state or other medium and penetrating power, the generation of micropore can also reduce material thermal stresses at high temperature to a certain extent, improves its thermal shock resistance simultaneously.In addition, utilize the nano aluminium oxide of introducing to produce Ceramic bond with the Reactive alumina reaction of reacting the activated alumina of generation and adding, the matrix strength of strengthening mould material, thus guaranteed material use properties at high temperature.

Therefore, preparation technology of the present invention is simple, energy consumption is lower, prepared corundum micropore insulating refractory has that mean pore size is little, refractoriness is high, hot strength is large, thermal conductivity is low, volume stability is good and the advantage such as corrosion resistance is strong, can be directly used in the working lining of Thermal Equipment, easy construction in use, labour intensity are low, have heat insulating and fire-resistant effect, heat insulation effect is better, is conducive to save energy and reduce the cost.

Embodiment

Below in conjunction with embodiment, the present invention will be further described, not the restriction to its protection domain.

For avoiding repetition, first related raw material and the admixture of this embodiment agreed to be described below, in embodiment, repeat no more:

The Al of plate diamond spar particle, white fused alumina particle and brown corundum in granules<sub TranNum="94">2</sub>o<sub TranNum="95">3</sub>content is 95 ~ 99wt%, granularity<3mm; The Al of plate diamond spar fine powder, white fused alumina fine powder and brown corundum fine powder<sub TranNum="96">2</sub>o<sub TranNum="97">3</sub>content is 95 ~ 99wt%, the Al of active α – alumina powder<sub TranNum="98">2</sub>o<sub TranNum="99">3</sub>content>99wt%, granularity is less than 0.009mm; The Al of active ρ – alumina powder<sub TranNum="100">2</sub>o<sub TranNum="101">3</sub>content>99wt%, granularity is less than 0.003mm; The Al of nano aluminium oxide<sub TranNum="102">2</sub>o<sub TranNum="103">3</sub>content is>99wt%, granularity is less than 100nm.

Embodiment 1

A kind of corundum micropore insulating refractory and preparation method thereof.Raw material and the content thereof of described corundum micropore insulating refractory are: the corundum in granules of 40 ~ 45wt%, the corundum fine powder of 40 ~ 45wt%, the active α – alumina powder of 8 ~ 10wt%, ρ-alumina powder of 7 ~ 10wt%; Admixture and content thereof are: the tripoly phosphate sodium STPP of above-mentioned raw materials 0.1 ~ 0.5wt%, above-mentioned raw materials 0.1 ~ 0.5wt%'s is nano alumina powder jointed, the water of above-mentioned raw materials 5 ~ 10wt%.

The preparation method of the present embodiment is: first by the content of raw material and admixture, prepare burden, by raw material and dispersant, make compound again, separately by nano alumina powder jointed, be dispersed in water, under ultra-sonic oscillation condition, disperse 1 ~ 5 minute, be mixed with uniform suspension; Then suspension is dropwise joined in described compound, stir, vibratory compaction, at room temperature maintenance 24 ~ 48 hours, the demoulding, by the idiosome after the demoulding through 110 ~ 200 ℃ dry 10 ~ 24 hours, finally under 1400 ~ 1500 ℃ of conditions, heat-treat, be incubated 1 ~ 3 hour, obtain corundum micropore insulating refractory.

In the present embodiment: corundum in granules is plate diamond spar particle; The grain composition ratio of corundum fine powder is: the plate diamond spar fine powder that granularity is less than 0.045mm accounts for 45 ~ 50wt%, and the plate diamond spar fine powder that granularity is 0.045mm ~ 0.088mm accounts for 50 ~ 55wt%.

The corundum micropore insulating refractory that the present embodiment is prepared, its performance test results shows: void content is 25 ~ 30%; Volume density is 2.85 ~ 2.90g/cm ³; Cold crushing strength is 80 ~ 90MPa; Strength at normal temperature is 15 ~ 20MPa; Mean pore size is 500 ~ 900nm; The thermal conductivity of 300 ℃ is 0.380 ~ 0.385 (W/ (mk)), and the thermal conductivity of 600 ℃ is 0.575 ~ 0.580 (W/ (mk)), and the thermal conductivity of 1000 ℃ is 0.725 ~ 0.730 (W/ (mk)).

Embodiment 2

A kind of corundum micropore insulating refractory and preparation method thereof.Raw material and the content thereof of described corundum micropore insulating refractory are: the corundum in granules of 45 ~ 50wt%, the corundum fine powder of 40 ~ 45wt%, the active α – alumina powder of 5 ~ 8wt%, ρ-alumina powder of 5 ~ 7wt%; Admixture and content thereof are: the Sodium hexametaphosphate 99 of above-mentioned raw materials 0.1 ~ 0.5wt%, above-mentioned raw materials 0.5 ~ 1.0wt%'s is nano alumina powder jointed, the water of above-mentioned raw materials 5 ~ 10wt%.

The preparation method of the present embodiment is: first by the content of raw material and admixture, prepare burden, by raw material and dispersant, make compound again, separately by nano alumina powder jointed, be dispersed in water, under ultra-sonic oscillation condition, disperse 1 ~ 5 minute, be mixed with uniform suspension; Then suspension is dropwise joined in described compound, stir, vibratory compaction, at room temperature maintenance 24 ~ 48 hours, the demoulding, by the idiosome after the demoulding through 110 ~ 200 ℃ dry 10 ~ 24 hours, finally under 1500 ~ 1600 ℃ of conditions, heat-treat, be incubated 3 ~ 5 hours, obtain corundum micropore insulating refractory.

In the present embodiment: corundum in granules is plate diamond spar particle; The grain composition ratio of corundum fine powder is: the brown corundum fine powder that granularity is less than 0.045mm accounts for 40 ~ 45wt%, and the brown corundum fine powder that granularity is 0.045mm ~ 0.088mm accounts for 55 ~ 60wt%.

The corundum micropore insulating refractory that the present embodiment is prepared, its performance test results shows: void content is 25 ~ 28%; Volume density is 2.87 ~ 2.90g/cm ³; Cold crushing strength is 60 ~ 75MPa; Strength at normal temperature is 20 ~ 25MPa; Mean pore size is 400 ~ 700nm; The thermal conductivity of 300 ℃ is 0.285 ~ 0.290 (W/ (mk)), and the thermal conductivity of 600 ℃ is 0.440 ~ 0.445 (W/ (mk)), and the thermal conductivity of 1000 ℃ is 0.800 ~ 0.805 (W/ (mk)).

Embodiment 3

A kind of corundum micropore insulating refractory and preparation method thereof.Raw material and the content thereof of described corundum micropore insulating refractory are: the corundum in granules of 40 ~ 45wt%, the corundum fine powder of 40 ~ 45wt%, the active α – alumina powder of 8 ~ 10wt%, ρ-alumina powder of 5 ~ 7wt%; Admixture and content thereof are: the polyoxyethylene glycol of above-mentioned raw materials 0.1 ~ 0.5wt%, above-mentioned raw materials 1.0 ~ 1.5wt%'s is nano alumina powder jointed, the water of above-mentioned raw materials 5 ~ 10wt%.

The preparation method of the present embodiment is: first by the content of raw material and admixture, prepare burden, by raw material and dispersant, make compound again, separately by nano alumina powder jointed, be dispersed in water, under ultra-sonic oscillation condition, disperse 1 ~ 5 minute, be mixed with uniform suspension; Then suspension is dropwise joined in described compound, stir, vibratory compaction, at room temperature maintenance 24 ~ 48 hours, the demoulding, by the idiosome after the demoulding through 110 ~ 200 ℃ dry 10 ~ 24 hours, finally under 1400 ~ 1500 ℃ of conditions, heat-treat, be incubated 3 ~ 5 hours, obtain corundum micropore insulating refractory.

In the present embodiment: corundum in granules is brown corundum in granules; The grain composition ratio of corundum fine powder is: the white fused alumina fine powder that granularity is less than 0.045mm accounts for 45 ~ 50wt%, and the white fused alumina fine powder that granularity is 0.045mm ~ 0.088mm accounts for 50 ~ 55wt%.

The corundum micropore insulating refractory that the present embodiment is prepared, its performance test results shows: void content is 20 ~ 28%; Volume density is 2.85 ~ 2.90g/cm ³; Cold crushing strength is 85 ~ 90MPa; Strength at normal temperature is 20 ~ 25MPa; Mean pore size is 300 ~ 600nm; The thermal conductivity of 300 ℃ is 0.200 ~ 0.205 (W/ (mk)), and the thermal conductivity of 600 ℃ is 0.600 ~ 0.605 (W/ (mk)), and the thermal conductivity of 1000 ℃ is 0.775 ~ 0.780 (W/ (mk)).

Embodiment 4

A kind of corundum micropore insulating refractory and preparation method thereof.Raw material and the content thereof of described corundum micropore insulating refractory are: the corundum in granules of 40 ~ 45wt%, the corundum fine powder of 40 ~ 45wt%, the active α – alumina powder of 5 ~ 8wt%, ρ-alumina powder of 7 ~ 10wt%; Admixture and content thereof are: the tripoly phosphate sodium STPP of above-mentioned raw materials 0.05 ~ 0.3wt% and the Sodium hexametaphosphate 99 of 0.05 ~ 0.2wt%, above-mentioned raw materials 0.5 ~ 1.0wt%'s is nano alumina powder jointed, the water of above-mentioned raw materials 5 ~ 10wt%.

The preparation method of the present embodiment is with embodiment 1.

In the present embodiment: corundum in granules is brown corundum in granules; The grain composition ratio of corundum fine powder is: the plate diamond spar fine powder that granularity is less than 0.045mm accounts for 40 ~ 45wt%, and the white fused alumina fine powder that granularity is 0.045mm ~ 0.088mm accounts for 55 ~ 60wt%.

The corundum micropore insulating refractory that the present embodiment is prepared, its performance test results shows: void content is 20 ~ 25%; Volume density is 2.90 ~ 2.95g/cm ³; Cold crushing strength is 90 ~ 100MPa; Strength at normal temperature is 25 ~ 30MPa; Mean pore size is 400 ~ 600nm; The thermal conductivity of 300 ℃ is 0.230 ~ 0.235 (W/ (mk)), and the thermal conductivity of 600 ℃ is 0.635 ~ 0.640 (W/ (mk)), and the thermal conductivity of 1000 ℃ is 0.835 ~ 0.840 (W/ (mk)).

Embodiment 5

A kind of corundum micropore insulating refractory and preparation method thereof.Raw material and the content thereof of described corundum micropore insulating refractory are: the corundum in granules of 45 ~ 50wt%, the corundum fine powder of 40 ~ 45wt%, the active α – alumina powder of 5 ~ 8wt%, ρ-alumina powder of 5 ~ 7wt%; Admixture and content thereof are: the tripoly phosphate sodium STPP of above-mentioned raw materials 0.05 ~ 0.3wt% and the polyoxyethylene glycol of 0.05 ~ 0.2wt%, above-mentioned raw materials 0.1 ~ 0.5wt%'s is nano alumina powder jointed, the water of above-mentioned raw materials 5 ~ 10wt%.

The preparation method of the present embodiment is: first by the content of raw material and admixture, prepare burden, by raw material and dispersant, make compound again, separately by nano alumina powder jointed, be dispersed in water, under ultra-sonic oscillation condition, disperse 1 ~ 5 minute, be mixed with uniform suspension; Then suspension is dropwise joined in described compound, stir, vibratory compaction, at room temperature maintenance 24 ~ 48 hours, the demoulding, by the idiosome after the demoulding through 110 ~ 200 ℃ dry 10 ~ 24 hours, finally under 1500 ~ 1600 ℃ of conditions, heat-treat, be incubated 1 ~ 3 hour, obtain corundum micropore insulating refractory.

In the present embodiment: corundum in granules is white fused alumina particle; The grain composition ratio of corundum fine powder is: the plate diamond spar fine powder that granularity is less than 0.045mm accounts for 45 ~ 50wt%, and the brown corundum fine powder that granularity is 0.045mm ~ 0.088mm accounts for 50 ~ 55wt%.

The corundum micropore insulating refractory that the present embodiment is prepared, its performance test results shows: void content is 25 ~ 30%; Volume density is 2.75 ~ 2.80g/cm ³; Cold crushing strength is 50 ~ 80MPa; Strength at normal temperature is 12 ~ 20MPa; Mean pore size is 600 ~ 1000nm; The thermal conductivity of 300 ℃ is 0.625 ~ 0.630 (W/ (mk)), and the thermal conductivity of 600 ℃ is 0.735 ~ 0.740 (W/ (mk)), and the thermal conductivity of 1000 ℃ is 1.000 ~ 1.050 (W/ (mk)).

Embodiment 6

A kind of corundum micropore insulating refractory and preparation method thereof.Raw material and the content thereof of described corundum micropore insulating refractory are: the corundum in granules of 40 ~ 45wt%, the corundum fine powder of 40 ~ 45wt%, the active α – alumina powder of 8 ~ 10wt%, ρ-alumina powder of 7 ~ 10wt%; Admixture and content thereof are: the Sodium hexametaphosphate 99 of above-mentioned raw materials 0.05 ~ 0.3wt% and the polyoxyethylene glycol of 0.05 ~ 0.2wt%, above-mentioned raw materials 1.0 ~ 1.5wt%'s is nano alumina powder jointed, the water of above-mentioned raw materials 5 ~ 10wt%.

The preparation method of the present embodiment is with embodiment 2.

In the present embodiment: corundum in granules is white fused alumina particle; The grain composition ratio of corundum fine powder is: the white fused alumina fine powder that granularity is less than 0.045mm accounts for 40 ~ 45wt%, and the brown corundum fine powder that granularity is 0.045mm ~ 0.088mm accounts for 55 ~ 60wt%.

The corundum micropore insulating refractory that the present embodiment is prepared, its performance test results shows: void content is 28 ~ 30%; Volume density is 2.73 ~ 2.82g/cm ³; Cold crushing strength is 65 ~ 90MPa; Strength at normal temperature is 15 ~ 25MPa; Mean pore size is 500 ~ 800nm; The thermal conductivity of 300 ℃ is 0.362 ~ 0.368 (W/ (mk)), and the thermal conductivity of 600 ℃ is 0.523 ~ 0.545 (W/ (mk)), and the thermal conductivity of 1000 ℃ is 0.675 ~ 0.690 (W/ (mk)).

This embodiment is incorporated in corundum pouring material nano alumina powder jointed, and preparation technology is simple, energy consumption is lower.It is main raw material that this mould material system is selected corundum, in use without low melt-phase, produces, and refractoriness is high.Utilize active ρ-alumina powder and water that hydration reaction occurs at normal temperatures, generate bayerite and boehmite colloidal sol, produce early strength, at high temperature there is dehydration reaction and generate activated alumina in its hydrated product, produce a large amount of micropores simultaneously; On the other hand, the nano alumina powder jointed effect that can play refinement pore of introducing, and form a large amount of submicron orders and nano level pore, the pore of this scope size can reduce the thermal conductivity of material, thermosteresis in high temperature kiln or container is reduced greatly, improved material to the anti-erosion of high-temperature liquid state or other medium and penetrating power, the generation of micropore can also reduce material thermal stresses at high temperature to a certain extent, improves its thermal shock resistance simultaneously.In addition, utilize the nano aluminium oxide of introducing to produce Ceramic bond with the Reactive alumina reaction of reacting the activated alumina of generation and adding, the matrix strength of strengthening mould material, thus guaranteed material use properties at high temperature.

The corundum micropore insulating refractory that this embodiment is prepared, its performance test results shows: void content is 20 ~ 30%; Volume density is 2.73 ~ 2.95g/cm ³; Cold crushing strength is 50 ~ 100MPa; Strength at normal temperature is 12 ~ 30MPa; Mean pore size is 300 ~ 1000nm; The thermal conductivity of 300 ℃ is 0.200 ~ 0.630 (W/ (mk)), and the thermal conductivity of 600 ℃ is 0.440 ~ 0.740 (W/ (mk)), and the thermal conductivity of 1000 ℃ is 0.675 ~ 1.050 (W/ (mk)).

Therefore, this embodiment preparation technology is simple, energy consumption is lower, prepared corundum micropore insulating refractory has that mean pore size is little, refractoriness is high, hot strength is large, thermal conductivity is low, volume stability is good and the advantage such as corrosion resistance is strong, can be directly used in the working lining of Thermal Equipment, easy construction in use, labour intensity are low, have heat insulating and fire-resistant effect, heat insulation effect is better, is conducive to save energy and reduce the cost.

Claims (2)

1. the preparation method of a corundum micropore insulating refractory, the raw material and the content thereof that it is characterized in that described corundum micropore insulating refractory are: the corundum in granules of 40～50wt%, the corundum fine powder of 40～45wt%, the active α – alumina powder of 5～10wt%, 5～10wt% ρ – alumina powder; Admixture and content thereof are: the dispersion agent of above-mentioned raw materials 0.1～0.5wt%, and above-mentioned raw materials 0.1～1.5wt%'s is nano alumina powder jointed, the water of above-mentioned raw materials 5～10wt%;

The preparation method of described corundum micropore insulating refractory is: first by the content of raw material and admixture, prepare burden, again by raw material and dispersant, make compound, separately by nano alumina powder jointed, be dispersed in water, under ultra-sonic oscillation condition, disperse 1～5 minute, be mixed with uniform suspension; Then suspension is dropwise joined in described compound, stir, vibratory compaction, at room temperature maintenance 24～48 hours, the demoulding, by the base substrate after the demoulding through 110～200 ℃ dry 10～24 hours, finally under 1400～1600 ℃ of conditions, heat-treat, be incubated 1～5 hour, obtain corundum micropore insulating refractory;

Described corundum in granules is a kind of in plate diamond spar particle, white fused alumina particle, brown corundum in granules; The Al of corundum in granules<sub TranNum="149">2</sub>o<sub TranNum="150">3</sub>content is 95～99wt%, granularity<3mm;

Described corundum fine powder is one or both in plate diamond spar fine powder, white fused alumina fine powder, brown corundum fine powder; The Al of corundum fine powder ₂o ₃content is 95～99wt%, and the grain composition ratio of corundum fine powder is: the corundum fine powder that granularity is less than 0.045mm accounts for 40～50wt%, and the corundum fine powder that granularity is 0.045mm～0.088mm accounts for 50～60wt%;

Described dispersion agent is one or both in tripoly phosphate sodium STPP, Sodium hexametaphosphate 99 and polyoxyethylene glycol;

The Al of described nano aluminium oxide ₂o ₃content is>99wt%, granularity is less than 100nm;

The Al of described active α – alumina powder ₂o ₃content>99wt%, granularity is less than 0.009mm;

The Al of described ρ – alumina powder ₂o ₃content>99wt%, granularity is less than 0.003mm.

2. the prepared corundum micropore insulating refractory of the preparation method of corundum micropore insulating refractory according to claim 1.