CN110483023A - A kind of microporous corundum brick and preparation method thereof - Google Patents
A kind of microporous corundum brick and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a kind of microporous corundum bricks and preparation method thereof.Microporous corundum brick primary raw material group becomes dense alumina 75~95%, andalusite 0~10%, silicon carbide 0~8%, bonding clay powder 3~5% and metal silicon powder 0.4~2%.Dense alumina or dense alumina and andalusite is dry-mixed as aggregate；Then phenolic resin mixing is added；It is subsequently added into silicon carbide, bonding clay powder, metal silicon powder or bonding clay powder, metal silicon powder mixed grind, obtains mixed material；Mixed material is pressed into adobe；Adobe is successively dried, is burnt into, and obtains product microporous corundum brick.Prepared by the method refractory product has moderate heating conduction, high withstand voltage intensity, excellent anti-erosion, erosion resistibility and excellent thermal shock resistance, product can be burnt under open oxidizing atmosphere, its high production efficiency, the technique requirement that large blast furnace ceramic cup harshness can be met, has excellent using effect.
Description
One, technical field:
The present invention relates to a kind of refractory materials and preparation method thereof, more particularly to a kind of microporous corundum brick and its preparation
Method.
Two, background technique:
Realize that prolonging campaign, enlargement are the important goals of Iron industry.As China's iron and steel metallurgical industry energy conservation is dropped
Consumption and deepening constantly for energy-saving and emission-reduction work promote with strength, and it is field of new materials that exploitation, which adapts to prolonging campaign with refractory material,
One of research emphasis.Prolonging campaign is system engineering, and blast-furnace body is played an important role wherein with refractory material.
In recent years, use and strengthening smelting of the steel industry due to economy material, so that blast furnace work condition environment is increasingly disliked
Bad, erosion, erosion of alkali of slag etc. are all greatly reinforced, and cupola well refractory material is required to have more strong anti-invade in this case
Corrosion energy.In addition, theoretical and practice have shown that control aperture, increasing micropore ratio can be improved the service performances such as the anti-slag of material.It is micro-
Hole refractory material not only can be with the service life compared with market application product height, but also plays important energy conservation in use and make
With in recent years gradually by more and more steel designing institutees and iron company's approval.
The manufacturing of microporous refractory material at present is burnt into using reducing atmosphere, and usually there are two types of modes: inert gas
Protection and buried charcoal firing.Inert gas shielding calcination equipment complexity, and large-scale or ultra-large type size product not easy to produce.Buried charcoal
Firing process is more, and industrial production efficiency is low, and dust is very big during product buried charcoal and brick output, and production environment is poor.
Corundum brick can make the pore volume rate less than 1 μm be increased to 50% or more in burying under carbon atmosphere, average pore size 1 μm with
It is interior, but be sintered under weak oxide atmosphere, average pore size still has 7 μm or so, wherein less than 1 μm pore volume rate is 20%~30%
Between, it is sintered under oxidizing atmosphere, micropore size is less or does not have.Refractory material microporous is burnt under common oxidizing atmosphere
At being a problem to be solved.
Three, summary of the invention:
The technical problem to be solved by the present invention is being burnt into production equipment using existing tunnel kiln and according to environmental requirement, mention
For a kind of microporous corundum brick and preparation method thereof.The characteristics of present invention combination blast furnace and microporous corundum brick, using fine and close rigid
The raw materials such as jade, andalusite, silicon carbide, metal silicon powder prepare adobe after material mixing, molding, drying, then burn through tunnel oven high temperature
System forms microporous corundum brick.
To solve the above-mentioned problems, the technical scheme adopted by the invention is as follows:
The present invention provides a kind of microporous corundum brick, in terms of weight percentage, the main original of the microporous corundum brick
Material group becomes dense alumina 75~95%, andalusite 0~10%, silicon carbide 0~8%, bonding clay powder 3~5% and metallic silicon
Micro mist 0.4~2%.
According to above-mentioned microporous corundum brick, in terms of weight percentage, the dense alumina 75~95% is by partial size
The dense alumina 5~10% of 5-3mm, the dense alumina 30~50% of partial size 3-1mm and partial size < 1mm dense alumina 40~
55% composition.
According to above-mentioned microporous corundum brick, the bulk density of the dense alumina is 3.8~3.9g/cm3。
According to above-mentioned microporous corundum brick, granularity<180 mesh of the silicon carbide, purity>=97% of silicon carbide.
According to above-mentioned microporous corundum brick, granularity < 180 mesh of the bonding clay powder.
According to above-mentioned microporous corundum brick, granularity < 1 μm of the metal silicon powder, the quality of Si in metal silicon powder
Percentage composition >=95%.
According to above-mentioned microporous corundum brick, granularity < 1mm of the andalusite, Al in andalusite2O3Quality percentage contain
Amount >=57%.
Additionally, it is provided a kind of preparation method of microporous corundum brick, the preparation method comprises the following steps:
A, various raw materials are weighed first, in accordance with the ratio of above-mentioned microporous corundum brick；
B, it is poured into dry-mixed 1~2 in batch mixer using weighed raw material dense alumina or dense alumina and andalusite as aggregate
Minute；Then the phenolic resin for accounting for all raw material gross weights 2~3% is added, then carries out mixing 3~5 minutes；It is subsequently added into and weighs
Raw material silicon carbide, bonding clay powder, metal silicon powder or bonding clay powder, metal silicon powder, after addition carry out mixed grind 15~
25 minutes, obtain mixed material；
C, mixed material obtained by step b is pressed using moulding press, obtains adobe；
D, the adobe of compression moulding is 24~36 hours dry in dry kiln, dry kiln enters vehicle mouth temperature < 90 DEG C, dry
Maximum temperature is controlled at 110~180 DEG C；
E, adobe of the step d after dry is used into hyperthermia tunnel Kiln or shuttle kiln, is burnt under oxidizing atmosphere, firing temperature
It is 1420~1550 DEG C, reaches 4~8h of heat preservation under the conditions of firing temperature, be cooled to room temperature to obtain product microporous corundum after heat preservation
Brick.
According to the preparation method of above-mentioned microporous corundum brick, the briquetting pressure 400~1000 of moulding press in step c
Ton；The bulk density of gained adobe is 3.10~3.35g/cm3。
According to the preparation method of above-mentioned microporous corundum brick, the specific heating process be burnt into step e are as follows: through 10~
14h, temperature rise to 450 DEG C by room temperature；Through 12~16h, 850 DEG C are risen to by 450 DEG C；Through 16~for 24 hours, 1250 are risen to by 850 DEG C
DEG C~1300 DEG C；Through 20~26h, 1500~1550 DEG C are risen to by 1250 DEG C~1300 DEG C；It is protected under the conditions of 1500~1550 DEG C
4~8h of temperature；Then through 12~16h, temperature is down to 800 DEG C by 1500~1550 DEG C, most afterwards through 10~14h, is down to room by 800 DEG C
Warm product kiln discharge.
Positive beneficial effect of the invention:
1, there is moderate heating conduction, high withstand voltage intensity using the refractory product of technical solution of the present invention preparation, it is excellent
Anti-erosion, erosion resistibility and excellent thermal shock resistance, product can be burnt under open oxidizing atmosphere, production efficiency
Height can meet the technique requirement of large blast furnace ceramic cup harshness, have excellent using effect.
2, the present invention is in microporous corundum brick sintering process, to 450 DEG C or so since 200 DEG C, in technical solution
Metal silicon powder gradually aoxidizes and is formed sull, prevents oxygen to brick body internal penetration, effective protection silicon carbide and phenol
Carbon in urea formaldehyde is not oxidized.
3, the metal silicon powder in technical solution of the present invention, granularity < 1 μm form micropore size in oxidation process,
The close 3.10g/cm of products obtained therefrom microporous corundum brick body after measured3, the porosity less than 12%, wherein aperture accounting for about less than 1 μm
60% or more, slag corrosion resistance depth is in 2mm or less；Close conventional ceramic cup material bodies are 3.05g/cm3Left and right, slag corrosion resistance depth
In 14mm or more.
Four, specific embodiment:
The present invention is further explained with reference to embodiments, but is not intended to limit the range of technical solution of the present invention protection.
In following embodiment: the bulk density of the dense alumina used is 3.8~3.9g/cm3；Granularity < 180 of silicon carbide
Mesh, purity >=97% of silicon carbide；The granularity of bonding clay < 180 mesh；Granularity < 1 μm of metal silicon powder, in metal silicon powder
Mass percentage >=95% of Si；Granularity < 1mm of andalusite, Al in andalusite2O3Mass percentage >=57%.Separately
Outside, dense alumina includes 5-3mm dense alumina, 3-1mm dense alumina and < 1mm dense alumina, wherein < 1mm dense alumina is divided into
1-0mm dense alumina and 180 mesh dense aluminas；Granularity < 1mm of andalusite, including 1-0mm andalusite and 180 mesh andalusites.
Embodiment 1:
Microporous corundum brick of the present invention, in terms of weight percentage, raw material composition are as follows: the dense alumina of partial size 5-3mm
5%, the dense alumina 42% of partial size 3-1mm, the dense alumina 18% of partial size 1-0mm, the dense alumina 22% of 180 mesh of partial size,
Carborundum powder 8%, bonding clay powder 3% and metal silicon powder 2%.
Embodiment 2:
Microporous corundum brick of the present invention, in terms of weight percentage, raw material composition are as follows: the dense alumina of partial size 5-3mm
10%, the dense alumina 37% of partial size 3-1mm, the dense alumina 13% of partial size 1-0mm, the dense alumina 29% of 180 mesh of partial size,
Andalusite 5%, carborundum powder 0.5%, bonding clay powder 5% and the metal silicon powder 0.5% of partial size 1-0mm.
Embodiment 3:
Microporous corundum brick of the present invention, in terms of weight percentage, raw material composition are as follows: the dense alumina of partial size 5-3mm
8%, the dense alumina 30% of partial size 3-1mm, the dense alumina 17% of partial size 1-0mm, the dense alumina 23% of 180 mesh of partial size,
The andalusite 5% of partial size 1-0mm, the andalusite 5% of 180 mesh of partial size, carborundum powder 6%, bonding clay powder 5% and metallic silicon are micro-
Powder 1%.
The preparation method of 1-3 microporous corundum brick of the embodiment of the present invention, the detailed step of the preparation method are as follows:
A, various raw materials are weighed first, in accordance with the ratio of any microporous corundum brick of embodiment 1-3；
B, dry-mixed 2 points are poured into batch mixer using weighed raw material dense alumina or dense alumina and andalusite as aggregate
Clock；Then the phenolic resin for accounting for all raw material gross weights 3% is added, then carries out mixing 5 minutes；It is subsequently added into weighed material carbon
SiClx powder, bonding clay powder, metal silicon powder carry out mixed grind 20 minutes after addition, obtain mixed material；
C, mixed material obtained by step b being pressed using moulding press, the pressure of moulding press is 1000 tons,
Compacting obtains adobe, and the bulk density of gained adobe is 3.10~3.35g/cm3；
D, the adobe of compression moulding is 32 hours dry in dry kiln, dry kiln enters vehicle mouth temperature < 90 DEG C, dry highest
Temperature is controlled at 120~160 DEG C；
E, adobe of the step d after dry is used into hyperthermia tunnel Kiln or shuttle kiln, is burnt under oxidizing atmosphere, firing temperature
It is 1550 DEG C, reaches and keep the temperature 6h under the conditions of firing temperature, be cooled to room temperature to obtain product microporous corundum brick after heat preservation；
The specific heating process of firing are as follows: through 12h, temperature rises to 450 DEG C by room temperature；Through 15h, 850 are risen to by 450 DEG C
℃；Through 20h, 1300 DEG C are risen to by 850 DEG C；Through 22h, 1550 DEG C are risen to by 1300 DEG C；6h is kept the temperature under the conditions of 1550 DEG C；Then
Through 16h, temperature is down to 800 DEG C by 1550 DEG C, most afterwards through 12h, is down to ambient product kiln discharge by 800 DEG C.
Using 1-3 of the embodiment of the present invention preparation resulting product microporous corundum brick correlated performance detection data see Table 1 for details.
The correlated performance detection data of 1 1-3 products obtained therefrom of the embodiment of the present invention of table
Claims (10)
1. a kind of microporous corundum brick, it is characterised in that: in terms of weight percentage, the primary raw material of the microporous corundum brick
Group becomes dense alumina 75~95%, and andalusite 0~10%, silicon carbide 0~8%, bonding clay powder 3~5% and metallic silicon are micro-
Powder 0.4~2%.
2. microporous corundum brick according to claim 1, it is characterised in that: in terms of weight percentage, described fine and close rigid
Jade 75~95% be by the dense alumina 5~10% of partial size 5-3mm, the dense alumina 30~50% of partial size 3-1mm and partial size <
The dense alumina 40~55% of 1mm forms.
3. microporous corundum brick according to claim 1, it is characterised in that: the bulk density of the dense alumina is 3.8
~3.9g/cm3。
4. microporous corundum brick according to claim 1, it is characterised in that: the granularity of the silicon carbide < 180 mesh, carbonization
Purity >=97% of silicon.
5. microporous corundum brick according to claim 1, it is characterised in that: the granularity of the bonding clay powder < 180 mesh.
6. microporous corundum brick according to claim 1, it is characterised in that: granularity < 1 μm of the metal silicon powder, gold
Belong to mass percentage >=95% of Si in silicon powder.
7. microporous corundum brick according to claim 1, it is characterised in that: granularity < 1mm of the andalusite, andalusite
Middle Al2O3Mass percentage >=57%.
8. a kind of preparation method of microporous corundum brick, which is characterized in that the preparation method comprises the following steps:
A, various raw materials are weighed first, in accordance with the ratio of microporous corundum brick described in claim 1；
B, it is poured into batch mixer dry-mixed 1~2 minute using weighed raw material dense alumina or dense alumina and andalusite as aggregate；
Then the phenolic resin for accounting for all raw material gross weights 2~3% is added, then carries out mixing 3~5 minutes；It is subsequently added into weighed original
Expect silicon carbide, bonding clay powder, metal silicon powder or bonding clay powder, metal silicon powder, 15~25 points of mixed grind are carried out after addition
Clock obtains mixed material；
C, mixed material obtained by step b is pressed using moulding press, obtains adobe；
D, the adobe of compression moulding is 24~36 hours dry in dry kiln, dry kiln enters vehicle mouth temperature < 90 DEG C, dry highest
Temperature is controlled at 110~180 DEG C；
E, adobe of the step d after dry is used into hyperthermia tunnel Kiln or shuttle kiln, is burnt under oxidizing atmosphere, firing temperature is
1420~1550 DEG C, reaches 4~8h of heat preservation under the conditions of firing temperature, be cooled to room temperature to obtain product microporous corundum after heat preservation
Brick.
9. the preparation method of microporous corundum brick according to claim 8, it is characterised in that: moulding press in step c
400~1000 tons of briquetting pressure；The bulk density of gained adobe is 3.10~3.35g/cm3。
10. the preparation method of microporous corundum brick according to claim 8, which is characterized in that is burnt into step e is specific
Heating process are as follows: through 10~14h, temperature rises to 450 DEG C by room temperature；Through 12~16h, 850 DEG C are risen to by 450 DEG C；Through 16~
For 24 hours, 1250 DEG C~1300 DEG C are risen to by 850 DEG C；Through 20~26h, 1500~1550 DEG C are risen to by 1250 DEG C~1300 DEG C；In
4~8h is kept the temperature under the conditions of 1500~1550 DEG C；Then through 12~16h, temperature is down to 800 DEG C by 1500~1550 DEG C, is most passed through afterwards
10~14h is down to ambient product kiln discharge by 800 DEG C.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112645697A (en) * | 2020-12-07 | 2021-04-13 | 北京金隅通达耐火技术有限公司 | High-density corundum mullite brick for hazardous waste disposal rotary kiln |
| CN115819075A (en) * | 2022-12-10 | 2023-03-21 | 巩义通达中原耐火技术有限公司 | Low-temperature sintered titanium-rich corundum composite silicon carbide brick and preparation method thereof |
| CN116462493A (en) * | 2023-03-31 | 2023-07-21 | 巩义通达中原耐火技术有限公司 | Titanium-rich corundum composite silicon carbide unburned brick and preparation method thereof |
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| CN112645697A (en) * | 2020-12-07 | 2021-04-13 | 北京金隅通达耐火技术有限公司 | High-density corundum mullite brick for hazardous waste disposal rotary kiln |
| CN115819075A (en) * | 2022-12-10 | 2023-03-21 | 巩义通达中原耐火技术有限公司 | Low-temperature sintered titanium-rich corundum composite silicon carbide brick and preparation method thereof |
| CN116462493A (en) * | 2023-03-31 | 2023-07-21 | 巩义通达中原耐火技术有限公司 | Titanium-rich corundum composite silicon carbide unburned brick and preparation method thereof |
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| CN110483023B (en) | 2022-05-24 |
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