CN1557771A - Composite plasticity corundum brick - Google Patents
Composite plasticity corundum brick Download PDFInfo
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- CN1557771A CN1557771A CNA200410010028XA CN200410010028A CN1557771A CN 1557771 A CN1557771 A CN 1557771A CN A200410010028X A CNA200410010028X A CN A200410010028XA CN 200410010028 A CN200410010028 A CN 200410010028A CN 1557771 A CN1557771 A CN 1557771A
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Abstract
The present invention discloses one kind of plastic phase combined composite corundum brick. The plastic phase combined composite corundum brick is produced with the materials including bauxite corundum aggregate 55-63 wt%, fine bauxite corundum powder in 180-320 mesh 19-28 wt%, SiCpw in 180-320 mesh 9-14 wt%, metal Si powder 3-7 wt% and kaolin 5-8 wt%, and through the steps of: mixing the said materials to form mud; forming inside mold in press with work pressure of 400-630 ton for 5-10 times, natural drying, sintering inside kiln at 1400-1600 deg.c for 140180 hr, and natural cooling before taking out of kiln. The brick of the present invention may be used in blast furnace with service life at high smelting strength up to 12 years.
Description
The technical field is as follows:
the invention relates to a plastic combined corundum composite brick suitable for an iron-making blast furnace hearth lining.
Background art:
china since 92 years Anlun Steel No. 7 furnace (2580 m)3) Since the self-baking carbon block-ceramic masonry composite furnace steel lining structure is adopted on the iron-making blast furnace lining for the first time, the obvious effects of saving energy, reducing consumption and being beneficial to blast furnace strengthening are achieved so far, and the superiority of the self-baking carbon block-ceramic masonry composite furnace steel lining structure is acknowledged by related experts and blast furnace workers. However, with further enhancement of blast furnace smelting (2000 m)3The utilization coefficient of the large blast furnace is 2.2-2.5t/m3.d，300-400m3The utilization coefficient of the medium and small-sized blast furnace reaches 2.8-3.2t m3D), the working conditions of the ceramic masonry in the hearth composite structure are further deteriorated, so that the currently used steel lining (mainly corundum mullite or composite brown corundum brick) of the ceramic masonry composite furnace is difficult to meet the requirement of the blast furnace for realizing the service life of more than 12 years. The research shows that the main reasons influencing the service life of the steel lining of the ceramic masonry composite furnace come from the following aspects:
destructive effect of molten iron infiltration
After the blast furnace is enlarged and the pressure at the top of the furnace is increased (0.15-0.2Mpa), the penetrability of molten iron into the brick body is increased. In normal production, molten iron with the temperature more than or equal to 1150 ℃ is in a liquid state. When the blast furnace stops blowing for a long time, the expansion stress generated when the molten iron is solidified after the temperature of the hearth is reduced has great destructive effect on the brick body. The following are observed on corundum-mullite bricks collected during blast furnace overhaul: and large cracks appear in the transverse direction and the radial direction, and molten iron penetrates into the interior of the brick body along the cracks to a depth of more than 2/3 of the residual bricks.
Second, destructive action of thermal stress
The ceramic masonry lining of the furnace hearth bears high temperature (above 1450 ℃) at one end, and works under the condition that water is introduced into the cooling wall for cooling at the other end, so that the ceramic masonry has a great temperature gradient along the radial direction (the temperature difference between the two ends is about 1400 ℃). The ceramic masonry belongs to a working layer in the lining of the hearth, the inner side of the ceramic masonry is directly contacted with high-temperature coal gas and liquid slag iron, and the outer side of the ceramic masonry is contacted with carbon blocks (roasted carbon blocks or self-roastedcarbon blocks) with good heat conductivity. According to theoretical calculation and actual measurement results of a plurality of blast furnaces with different volumes, the ceramic masonry has a temperature difference of 500-600 ℃ within the length of 230mm or 345mm of a brick body, and large failure stress is generated in the brick body due to uneven expansion caused by different temperatures.
Third, destructive action of alkali metals
Although the alkali metal content in the raw materials and fuels for iron making is very low, the circulation enrichment phenomenon of the alkali metal exists in the blast furnace smelting process. Under the high temperature condition of 1450 deg.c inside the hearth, sodium, potassium, manganese and other alkali metals are gaseous and thus easy to invade into the pores of ceramic brick. By carrying out chemical analysis on the corundum-mullite brick collected by blast furnace overhaul, the alkali metal content of the working surface of the residual brick reaches more than 10 percent, and the alkali metal content of the contact end of the carbon block also reaches more than 3.45 percent. After alkali metal invades into the brick body to generate a low-melting-point compound, the alkali metal is more easily eroded by slag, and simultaneously, various service performances of the ceramic masonry are greatly reduced.
Fourth, the destructive action of the erosion and abrasion of molten iron
Because coke 'dead stock columns' exist in the hearth, the resistance of molten iron penetrating through the coke 'dead stock columns' is far larger than the resistance of molten iron flowing to the taphole along the circumference in the tapping process. Therefore, a circulating flow of molten iron must exist. The molten iron circulation has strong scouring and abrasion action on the lining of the side wall of the hearth, and garlic-shaped abnormal erosion often occurs at the joint of the side wall of the hearth and the bottom of the furnace. The smaller the height of the dead iron layer is, the stronger the scouring action is, and although the height of the dead iron layer is designed to be about 20% of the diameter of the hearth, the scouring abrasion caused by the circulation of molten iron is difficult to completely avoid.
Destructive effect of slag chemical attack
In blast furnace smelting, the stable operation of the furnace condition can be maintained only if the good fluidity of the slag is maintained. The better the fluidity of the slag, the stronger the penetration into the brick, the greater the destructive effect of the chemical attack, and in particular, the more rapid the destructive effect of the slag attack after the alkali metal has invaded and produced a low-melting compound.
Due to the existence of the factors, the ceramic masonry corundum mullite brick is decomposed to generate Al with a porous structure under the action of high temperature and reducing gas in a furnace hearth2O3。
The chemical reaction formula is as follows:
under the condition of the existence of alkali metal oxide, mullite is decomposed and simultaneously generates a large amount of glass phase with low melting point, thereby causing the reduction of various physicochemical indexes and service performance. In addition, secondary mullite occurs in the matrix as the mullite decomposes and free SiO precipitates in the bound clay. The decomposition and secondary mullite of the original mullite phase change the structure of the product, and a large number of structural defects appear in the product. Therefore, the liquid slag and iron can be seen from the lithofacies diagram to attack the corundum mullite brick from the cracks of the matrix and the grains, and the corundum mullite brick is gradually eroded as the liquid slag and the iron are deeply eroded.
For the ceramic masonry composite brown corundum brick, although the SIC in the composite brown corundum brick is not wetted with the molten slag and has better slag corrosion resistance, when the composite brown corundum brick is contacted with molten iron, the molten iron can well wet the SIC, and the SIC and the iron react as follows:
the reaction can be rapidly carried out at 1300 ℃ in the strong reducing atmosphere of the blast furnace hearth. Sin until the Si concentration in fem is less than 33%, i.e., until FeSi is not produced, SiC is destroyed. After FeSi is melted in molten iron, the reaction is carried out all the time, and finally the composite brown corundum is damaged.
The invention content is as follows:
the present invention aims at providing a plastic combined corundum composite brick suitable for the lining of the hearth of an iron-making blast furnace, and the service life of the blast furnace built by the corundum composite brick can reach more than 12 years.
The invention is realized by the following steps: the brown corundum aggregate, brown corundum fine powder, SiC powder, metal Si powder and high-collar soil are prepared according to the following mixture ratio and steps:
(1) proportioning
55-63% of brown corundum aggregate; 19-28% of brown corundum fine powder and 320 meshes of 180-; 9-14% of SiC powder and 320 meshes of 180-; 3-7% of metal Si powder; 5-8% of high-level soil;
(2) step(ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
secondly, placing the pug into a forming film die according to the size requirement of the brick body, placing the pug into a press machine for press forming, wherein the working pressure of the press machine is 400-630 tons, and the pressurizing times are as follows: 5-10 times;
and step three, naturally drying the pressed and molded brick body, then placing the brick body in a kiln for firing at the temperature of 1400 ℃ and 1600 ℃ for 140-180 hours, and then naturally cooling and discharging the brick body.
The invention can be prepared according to the following mixture ratio and steps:
(1) proportioning
55% of brown corundum aggregate; 28 percent of brown corundum fine powder and 180 meshes; 9 percent of SiC powder and 180 meshes; 7% of metal Si powder; 5% of high-soil-leading soil;
(2) step (ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
and step two, placing the pug into a forming film die according to the size requirement of a brick body, and putting into a press machine for press forming, wherein the working pressure of the press machine is 400 tons, and the pressurizing times are as follows: 10 times;
and step three, naturally drying the pressed and formed brick body, then placing the brick body in a kiln for firing at 1600 ℃ for 140 hours, and then naturally cooling and discharging the brick body out of the kiln.
The invention can also be prepared according to the following mixture ratio and steps:
(1) proportioning
63% of brown corundum aggregate; the brown corundum fine powder is 19 percent and 320 meshes; 14 percent of SiC powder and 320 meshes; 3% of metal Si powder; 8% of high-soil-leading soil;
(2) step (ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
and step two, placing the pug into a forming film die according to the size requirement of a brick body, and putting into a press machine for press forming, wherein the working pressure of the press machine is 630 tons, and the pressurizing times are as follows: 5 times;
and thirdly, naturally drying the pressed and molded brick body, then placing the brick body in a kiln for firing at 1400 ℃ for 180 hours, and then naturally cooling and discharging the brick body out of the kiln.
The invention can also be prepared according to the following mixture ratio and steps:
(1) proportioning
58% of brown corundum aggregate; the brown corundum fine powder is 24 percent and 245 meshes; 11% of SiC powder and 220 meshes; 5% of metal Si powder; 7% of high-soil-leading soil;
(2) step (ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
secondly, placing the pug into a forming film die according to the size requirement of a brick body, and placing the pug into a press machine for press forming, wherein the working pressure of the press machine is 500 tons, and the pressing times are 8 times;
and thirdly, naturally drying the pressed and molded brick body, then placing the brick body in a kiln for firing at 1500 ℃ for 150 hours, and then naturally cooling and discharging the brick body out of the kiln.
The invention has the advantages that the produced plasticity combined corundum composite brick has the following advantages by adopting the proportion and the production process:
1. the plastic combined corundum composite brick is characterized in that a metal phase is introduced into a corundum product, and in the use process, a plastic buffer layer is generated on an aggregate and substrate interface near the working surface of the product to absorb elastic deformation energy, so that the fracture toughness of the product is increased, and the high-temperature structural strength and the heat stress resistance of the product are obviously improved.
2. Under the use condition, the metal phase in the matrix can react with carbon and nitrogen to generate carbide and nitride, close the invasion channels of slag, molten iron and alkali metal on a working interface, and reduce the thickness of an erosion layer, thereby enhancing the erosion resistance of the whole product to the slag, the molten iron and the alkali metal.
3. The plastic combined corundum composite brick is the best material for building ceramic masonry in a blast furnace hearth, and various service performances of the plastic combined corundum composite brick are superior to those of the currently and commonly used brown corundum silicon carbide composite brick and corundum mullite brick.
Slag erosion resistance index% iron erosion resistance index%
Brown corundum-SiC brick 12.94.0
Plastic combined corundum composite brick 10.00
Corundum-mullite brick 38.99.0
| Mullite brick | Brown corundum-SiC brick plasticity combined corundum composite brick corundum |
| Apparent porosity% Bulk density g/cm3 Normal temperature compressive strength Mpa Alkali resistance index% | 15 13 17 3.16 3.15 3.06 113.6 120.8 80.7 1.05 1.18 -0.89 |
From the above table, the application of the plasticity combined with the corundum composite brick can prolong the service life of the blast furnace ceramic masonry, meet the requirement that the service life of the blast furnace reaches the target of more than 12 years under high smelting strength, and have considerable economic benefit compared with the use of corundum mullite brick and brown corundum silicon carbide composite brick.
The specific implementation mode is as follows:
example 1:
the plasticity combined corundum composite brick can be prepared according to the following mixture ratio and steps:
(1) proportioning
55% of brown corundum aggregate; 28 percent of brown corundum fine powder and 180 meshes; 9 percent of SiC powder and 180 meshes; 7% of metal Si powder; 5% of high-soil-leading soil;
(2) step (ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
and step two, placing the pug into a forming film die according to the size requirement of a brick body, and putting into a press machine for press forming, wherein the working pressure of the press machine is 400 tons, and the pressurizing times are as follows: 5 times;
and step three, naturally drying the pressed and formed brick body, then placing the brick body in a kiln for firing at 1600 ℃ for 140 hours, and then naturally cooling and discharging the brick body out of the kiln.
Example 2:
the plasticity combined corundum composite brick can also be prepared according to the following mixture ratio and steps:
(1) proportioning
63% of brown corundum aggregate; the brown corundum fine powder is 19 percent and 320 meshes; 14 percent of SiC powder and 320 meshes; 3% of metal Si powder; 8% of high-soil-leading soil;
(2) step (ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
and step two, placing the pug into a forming film die according to the size requirement of a brick body, and putting into a press machine for press forming, wherein the working pressure of the press machine is 630 tons, and the pressurizing times are as follows: 5 times;
and thirdly, naturally drying the pressed and molded brick body, then placing the brick body in a kiln for firing at 1400 ℃ for 180 hours, and then naturally cooling and discharging the brick body out of the kiln.
Example 3:
the plasticity combined corundum composite brick can be prepared according to the following proportion and steps:
(1) proportioning
58% of brown corundum aggregate; the brown corundum fine powder is 24 percent and 245 meshes; 11% of SiC powder and 220 meshes; 5% of metal Si powder; 7% of high-soil-leading soil;
(2) step (ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
and step two, placing the pug into a forming film die according to the size requirement of the brick body, and putting into a press machine for press forming, wherein the working pressure of the press machine is 500 tons, and the pressurizing times are as follows: 8 times;
and thirdly, naturally drying the pressed and molded brick body, then placing the brick body in a kiln for firing at 1500 ℃ for 150 hours, and then naturally cooling and discharging the brick body out of the kiln.
Claims (4)
1. A plasticity combined corundum composite brick is prepared from brown corundum aggregate, brown corundum fine powder, SiC powder, metal Si powder and high-collar soil according to the following proportion and steps:
(1) proportioning
55-63% of brown corundum aggregate; 19-28% of brown corundum fine powder and 320 meshes of 180-; 9-14% of SiC powder and 320 meshes of 180-; 3-7% of metal Si powder; 5-8% of high-level soil;
(2) step (ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
secondly, placing the pug into a forming film die according to the size requirement of the brick body, placing the pug into a press machine for press forming, wherein the working pressure of the press machine is 400-630 tons, and the pressurizing times are as follows: 5-10 times;
and step three, naturally drying the pressed and molded brick body, then placing the brick body in a kiln for firing at the temperature of 1400 ℃ and 1600 ℃ for 140-180 hours, and then naturally cooling and discharging the brick body.
2. The plastic bonded corundum composite brick according to claim 1, characterized in that: the preparation method comprises the following steps:
(1) proportioning
55% of brown corundum aggregate; 28 percent of brown corundum fine powder and 180 meshes; 9 percent of SiC powder and 180 meshes; 7% of metal Si powder; 5% of high-soil-leading soil;
(2) step (ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
and step two, placing the pug into a forming film die according to the size requirement of a brick body, and putting into a press machine for press forming, wherein the working pressure of the press machine is 400 tons, and the pressurizing times are as follows: 10 times;
and step three, naturally drying the pressed and formed brick body, then placing the brick body in a kiln for firing at 1600 ℃ for 140 hours, and then naturally cooling and discharging the brick body out of the kiln.
3. The plastic bonded corundum composite brick according to claim 1, characterized in that: the preparation method comprises the following steps:
(1) proportioning
63% of brown corundum aggregate; the brown corundum fine powder is 19 percent and 320 meshes; 14 percent of SiC powder and 320 meshes; 3% of metal Si powder; 8% of high-soil-leading soil;
(2) step (ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
and step two, placing the pug into a forming film die according to the size requirement of a brick body, and putting into a press machine for press forming, wherein the working pressure of the press machine is 630 tons, and the pressurizing times are as follows: 5 times;
and thirdly, naturally drying the pressed and molded brick body, then placing the brick body in a kiln for firing at 1400 ℃ for 180 hours, and then naturally cooling and discharging the brick body out of the kiln.
4. The plastic bonded corundum composite brick according to claim 1, characterized in that: the preparation method comprises the following steps:
(1) proportioning
58% of brown corundum aggregate; the brown corundum fine powder is 24 percent and 245 meshes; 11% of SiC powder and 220 meshes; 5% of metal Si powder; 7% of high-soil-leading soil;
(2) step (ii) of
Firstly, taking materials according to the proportion, fully mixing the materials to prepare pug;
and step two, placing the pug into a forming film die according to the size requirement of the brick body, and putting into a press machine for press forming, wherein the working pressure of the press machine is 500 tons, and the pressurizing times are as follows: 8 times;
and thirdly, naturally drying the pressed and molded brick body, then placing the brick body in a kiln for firing at 1500 ℃ for 150 hours, and then naturally cooling and discharging the brick body out of the kiln.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200410010028XA CN1557771A (en) | 2004-01-16 | 2004-01-16 | Composite plasticity corundum brick |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200410010028XA CN1557771A (en) | 2004-01-16 | 2004-01-16 | Composite plasticity corundum brick |
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| CN1557771A true CN1557771A (en) | 2004-12-29 |
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| CNA200410010028XA Pending CN1557771A (en) | 2004-01-16 | 2004-01-16 | Composite plasticity corundum brick |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361836A (en) * | 2009-03-30 | 2012-02-22 | 黑崎播磨株式会社 | Aluminum oxycarbide composition and process for producing same |
-
2004
- 2004-01-16 CN CNA200410010028XA patent/CN1557771A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102361836A (en) * | 2009-03-30 | 2012-02-22 | 黑崎播磨株式会社 | Aluminum oxycarbide composition and process for producing same |
| CN102361836B (en) * | 2009-03-30 | 2013-07-24 | 黑崎播磨株式会社 | Aluminum oxycarbide composition and process for producing same |
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