CN113416060A - Magnesium-calcium dry vibration material for continuous casting tundish and preparation method thereof - Google Patents
Magnesium-calcium dry vibration material for continuous casting tundish and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a magnesium-calcium dry vibration material for a continuous casting tundish, which comprises the following components in parts by weight: 10-15% of waste magnesia-calcium-carbon bricks with the granularity being more than 3 and less than or equal to 5mm, 10-15% of waste magnesia-calcium-carbon bricks with the granularity being more than 1 and less than or equal to 3mm, 15-20% of waste magnesia-calcium-carbon bricks with the granularity being more than 0 and less than or equal to 1mm, 0-5% of 91 magnesite with the granularity being more than 3 and less than or equal to 5mm, 10-20% of 91 magnesite with the granularity being more than 1 and less than or equal to 3mm, 10-25% of 95 medium magnesite with the granularity being more than 0 and less than or equal to 1mm, 25-28% of 95 medium magnesite with the granularity being 200 meshes, 2-4% of a binder and 1-2% of red clay. The invention uses the waste magnesia-calcium-carbon bricks as raw materials to produce the dry vibration material instead of magnesia, and the using effect is basically the same as that of the dry vibration material which is made by using magnesia as the main raw material. The CaO contained in the slag-free molten steel plays a role in purifying the molten steel, so that the slag resistance and the scouring resistance of the molten steel are improved. Effectively reduces the cost and the environmental pollution.
Description
Technical Field
The invention relates to a refractory material, in particular to a magnesium-calcium dry vibration material for a continuous casting tundish.
Background
In recent years, the variety of magnesia-calcia based refractory materials has been increasing due to the rapid development of magnesia-calcia based refractory materials. The Mg-Ca-C brick has the function of purifying molten steel due to the CaO contained in the brick, and is widely applied to smelting of high-purity steel. However, as CaO is very easy to hydrate, a lot of magnesia-calcium-carbon waste bricks which are unqualified due to physical factors such as cracks, expansion rules and the like caused by hydration appear in the production process, and the magnesia-calcium-carbon bricks can not be used and can only be used for waste treatment. The waste magnesia-calcium-carbon bricks can be used for producing high-quality shaped refractory materials and also can be used for producing a plurality of unshaped refractory materials. If the carbon dioxide can be fully utilized as a secondary resource, not only is a large amount of cost saved, but also the environmental pollution can be reduced, and great social benefit and economic benefit are achieved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a continuous casting tundish magnesium-calcium dry vibrating material, which improves the anti-scouring performance of products and can also achieve the aim of purifying molten steel.
In order to achieve the purpose, the invention adopts the following technical scheme:
a magnesium-calcium dry vibration material for a continuous casting tundish comprises the following components in parts by weight: 10-15% of waste magnesia-calcium-carbon bricks with the granularity being more than 3 and less than or equal to 5mm, 10-15% of waste magnesia-calcium-carbon bricks with the granularity being more than 1 and less than or equal to 3mm, 15-20% of waste magnesia-calcium-carbon bricks with the granularity being more than 0 and less than or equal to 1mm, 0-5% of 91 magnesite with the granularity being more than 3 and less than or equal to 5mm, 10-20% of 91 magnesite with the granularity being more than 1 and less than or equal to 3mm, 10-25% of 95 medium magnesite with the granularity being more than 0 and less than or equal to 1mm, 25-28% of 95 medium magnesite with the granularity being 200 meshes, 2-4% of a binder and 1-2% of red clay.
The magnesium-calcium-carbon waste brick comprises the following components in percentage by mass: al (Al)2O3Not more than 1 percent, not less than 58 percent of MgO, not less than 28 percent of CaO, not less than 7 percent and not more than 8 percent of C, and the breaking strength of the steel plate at 200 ℃ for 3 hours is not less than 2.0 MPa.
The binding agent is phenolic resin powder.
The red clay comprises the following components in percentage by mass: al (Al)2O3≥20％，SiO2≤70％，Fe2O3Less than or equal to 6 percent, less than or equal to 10 percent of scorching, less than or equal to 1 percent of water, and less than or equal to 15 percent of granularity plus 0.08 mm.
A preparation method of a magnesium-calcium dry vibration material for a continuous casting tundish specifically comprises the following steps:
1) crushing the waste magnesia-calcium-carbon bricks in a crusher, and sieving the crushed waste magnesia-calcium-carbon bricks into aggregates with the granularity of more than 0mm and less than or equal to 1mm, the granularity of more than 1mm and less than or equal to 3mm, and the granularity of more than 3mm and less than or equal to 5 mm;
2) the crushed magnesium-calcium-carbon waste brick particles are deironized and then enter a rotary kiln to be dried for 3-5min, wherein the drying temperature is 400-450 ℃.
3) Crushing 91 magnesite in a crusher, and screening to obtain aggregates with the granularity of more than 1mm and less than or equal to 3mm and the granularity of more than 3mm and less than or equal to 5 mm;
4) crushing 95 medium magnesite in a crusher, and sieving to obtain aggregate with granularity of more than 0 and less than or equal to 1mm and less than 200 meshes;
5) weighing the raw materials according to the proportion for later use;
6) mixing the raw materials
Firstly, adding 5-3mm, 3-1mm and 1-0mm aggregates, dry-mixing for 3-5min, then adding a bonding agent and red clay, mixing for 3-5min, then adding aggregates with the particle size of 200 meshes or less, and mixing for 4-6 min;
7) and (6) discharging.
A use method of a magnesium-calcium dry vibration material of a continuous casting tundish comprises the following steps: during construction, the continuous casting tundish is laid flat on the bottom of the tundish, the dry material is filled in the tire membrane to be vibrated and compacted, and the blank membrane is baked for 90 to 100 minutes at the temperature of between 200 and 230 ℃.
Compared with the prior art, the invention has the beneficial effects that:
the dry vibration material uses waste magnesia-calcium-carbon bricks as raw materials to replace partial magnesia, and the used waste magnesia-calcium-carbon bricks are all products with unqualified physical factors such as appearance and the like and products with unqualified non-chemical indexes. The using effect of the dry vibration material is basically the same as that of the dry vibration material which is prepared by taking magnesia as the main raw material. The CaO contained in the slag-free molten steel plays a role in purifying the molten steel, so that the slag resistance and the scouring resistance of the molten steel are improved. Effectively reduces the cost and the environmental pollution.
Drawings
FIG. 1 is a 1500 ℃ performance index chart for examples 1-6.
FIG. 2 is a scanning electron microscope image of example 1.
FIG. 3 is the electron scanning energy spectrum of example 1.
FIG. 4 is a scanning electron microscope image of example 4.
FIG. 5 is the electron scanning energy spectrum of example 4.
Detailed Description
The following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
The raw material compounding ratio of the magnesium-calcium dry vibration material for the continuous casting tundish in examples 1 to 6 is shown in Table 1.
Table 1: formula (unit:%) of magnesium-calcium dry vibration material for continuous casting tundish
The magnesium-calcium-carbon waste brick comprises the following components in percentage by mass: al (Al)2O3Not more than 1 percent, not less than 58 percent of MgO, not less than 28 percent of CaO, not less than 7 percent and not more than 8 percent of C, and multiplying the temperature by 3 hours at 200 ℃: the breaking strength is more than or equal to 2.0 MPa.
The binding agent is phenolic resin powder.
The red clay comprises the following components in percentage by mass: al (Al)2O3≥20％，SiO2≤70％，Fe2O3Less than or equal to 6 percent, less than or equal to 10 percent of scorching, less than or equal to 1 percent of water, and less than or equal to 15 percent of granularity plus 0.08 mm.
A preparation method of a magnesium-calcium dry vibration material for a continuous casting tundish specifically comprises the following steps:
1) crushing the waste magnesia-calcium-carbon bricks in a crusher, and sieving the crushed waste magnesia-calcium-carbon bricks into raw materials with the granularity of more than 0 and less than or equal to 1mm, the granularity of more than 1mm and less than or equal to 3mm, and the granularity of more than 3mm and less than or equal to 5 mm;
2) the crushed magnesium-calcium-carbon waste brick particles are deironized and then enter a rotary kiln to be dried for 3-5min, wherein the drying temperature is 400-450 ℃.
3) Crushing 91 magnesite in a crusher, and sieving to obtain raw materials with the granularity of more than 1mm and less than or equal to 3mm and the granularity of more than 3mm and less than or equal to 5 mm;
4) crushing 95 medium magnesite in a crusher, and sieving to obtain raw materials with the granularity of more than 0 and less than or equal to 1mm and less than 200 meshes;
5) weighing the raw materials according to the proportion for later use;
6) mixing the raw materials
Adding 5-3mm, 3-1mm and 1-0mm raw materials, dry-mixing for 3-5min, adding binder and red clay, mixing for 3-5min, adding raw materials below 200 mesh, and mixing for 4-6 min;
7) discharging;
8) detection of
And (3) after the mixed material is subjected to die filling, putting the mixed material into a constant-temperature drying oven for drying at 200 ℃ for 3 hours, demolding after drying, and detecting the obtained sample block.
The performance indexes of the magnesium-calcium dry vibration material for the continuous casting tundishes of examples 1 to 6 are shown in Table 2.
Table 2:
| index (I) | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 |
| Body density g/cm3 | 2.30 | 2.20 | 2.25 | 2.35 | 2.28 | 2.21 |
| Flexural strength MPa | 2.70 | 2.50 | 2.60 | 2.80 | 2.75 | 2.70 |
The detected performance index is shown in figure 1.
The scanning electron microscope image of example 1 is shown in FIG. 2, and the scanning electron microscope energy spectrum is shown in FIG. 3.
The electron micrograph of example 4 is shown in FIG. 4, and the electron micrograph is shown in FIG. 5.
From the scanning electron micrographs of the two examples, the microstructure of example 1 is very uniform in particles, the main elements of which are Mg, Al, Si, Ca, Fe, O. Example 4 microstructure after adding mg-Ca-c shows that the particles are also relatively uniform without new species formation, the Ca content is increased due to the addition of mg-Ca-c and the rest is not changed much.
As can be seen from the data, example 4 is superior to example 1 in both the bulk density and the bending resistance test at 1500 ℃, and in the slag resistance test, since example 4 contains CaO, molten steel can be purified and the slag resistance thereof can be enhanced, the example 4 is considered to be superior to example 1 comprehensively.
Claims (5)
1. The magnesium-calcium dry vibrating material for the continuous casting tundish is characterized by comprising the following components in parts by weight: 10-15% of waste magnesia-calcium-carbon bricks with the granularity being more than 3 and less than or equal to 5mm, 10-15% of waste magnesia-calcium-carbon bricks with the granularity being more than 1 and less than or equal to 3mm, 15-20% of waste magnesia-calcium-carbon bricks with the granularity being more than 0 and less than or equal to 1mm, 0-5% of 91 magnesite with the granularity being more than 3 and less than or equal to 5mm, 10-20% of 91 magnesite with the granularity being more than 1 and less than or equal to 3mm, 10-25% of 95 medium magnesite with the granularity being more than 0 and less than or equal to 1mm, 25-28% of 95 medium magnesite with the granularity being 200 meshes, 2-4% of a binder and 1-2% of red clay.
2. The magnesium-calcium dry vibration material of the continuous casting tundish according to claim 1, wherein the magnesium-calcium-carbon waste brick comprises the following components by weight percent: al (Al)2O3Not more than 1 percent, not less than 58 percent of MgO, not less than 28 percent of CaO, not less than 7 percent and not more than 8 percent of C, and multiplying the temperature by 3 hours at 200 ℃: the breaking strength is more than or equal to 2.0 MPa.
3. The magnesium-calcium dry vibration material of a continuous casting tundish according to claim 1, wherein the binder is phenolic resin powder.
4. The magnesium-calcium dry vibration material of the continuous casting tundish according to claim 1, wherein the red clay comprises the following components by performance indexes: al (Al)2O3≥20％，SiO2≤70％，Fe2O3Less than or equal to 6 percent, less than or equal to 10 percent of scorching, less than or equal to 1 percent of water, and less than or equal to 15 percent of granularity plus 0.08 mm.
5. The preparation method of the magnesium-calcium dry vibration material for the continuous casting tundish according to claim 1, which is characterized by comprising the following steps:
1) crushing the waste magnesia-calcium-carbon bricks in a crusher, and sieving the crushed waste magnesia-calcium-carbon bricks into aggregates with the granularity of more than 0mm and less than or equal to 1mm, the granularity of more than 1mm and less than or equal to 3mm, and the granularity of more than 3mm and less than or equal to 5 mm;
2) the crushed magnesium-calcium-carbon waste brick particles are deironized and then enter a rotary kiln to be dried for 3-5min, wherein the drying temperature is 400-450 ℃.
3) Crushing 91 magnesite in a crusher, and screening to obtain aggregates with the granularity of more than 1mm and less than or equal to 3mm and the granularity of more than 3mm and less than or equal to 5 mm;
4) crushing 95 medium magnesite in a crusher, and sieving to obtain aggregate with granularity of more than 0 and less than or equal to 1mm and less than 200 meshes;
5) weighing the raw materials according to the proportion for later use;
6) mixing the raw materials
Firstly, adding aggregate with the particle size of more than 0mm and less than or equal to 1mm, the particle size of more than 1mm and less than or equal to 3mm and the particle size of more than 3mm and less than or equal to 5mm, dry-mixing for 3-5min, then adding a bonding agent and red clay, mixing for 3-5min, adding aggregate with the particle size of 200 meshes and less, and mixing for 4-6 min;
7) and (6) discharging.
The use method of the magnesium-calcium dry vibration material of the continuous casting tundish according to claim 1 comprises the following steps: the method is characterized in that during construction, a continuous casting tundish is laid flat at the bottom of the tundish, a dry material is filled in a tire membrane to be vibrated and compacted, and the tire membrane is baked for 90 to 100 minutes at the temperature of between 200 and 230 ℃.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116023156A (en) * | 2022-12-21 | 2023-04-28 | 海城利尔麦格西塔材料有限公司 | Regeneration method of waste magnesia carbon bricks |
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| CN107602086A (en) * | 2017-09-28 | 2018-01-19 | 辽宁中镁控股股份有限公司 | A kind of magnesium calcareous ramming mass produced with waste refractory materials and its manufacture method |
| JP2018016515A (en) * | 2016-07-27 | 2018-02-01 | 黒崎播磨株式会社 | Magnesia-carbon brick and molten steel ladle using the same |
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| CN111333408A (en) * | 2020-03-10 | 2020-06-26 | 北京利尔高温材料股份有限公司 | Regenerated magnesium-aluminum-carbon tundish dry material and preparation method thereof |
| CN112194465A (en) * | 2020-10-12 | 2021-01-08 | 北京利尔高温材料股份有限公司 | Tundish dry material and preparation method thereof |
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- 2021-06-01 CN CN202110607567.5A patent/CN113416060A/en not_active Withdrawn
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|---|---|---|---|---|
| CN1840500A (en) * | 2005-04-01 | 2006-10-04 | 高兴奎 | Dry working lining for Mg-Ca-C tundish |
| JP2018016515A (en) * | 2016-07-27 | 2018-02-01 | 黒崎播磨株式会社 | Magnesia-carbon brick and molten steel ladle using the same |
| CN106915953A (en) * | 2017-04-01 | 2017-07-04 | 海城市中兴镁质合成材料有限公司 | A kind of tundish dry material and its mode of production using useless magnesite-chrome brick |
| CN107602086A (en) * | 2017-09-28 | 2018-01-19 | 辽宁中镁控股股份有限公司 | A kind of magnesium calcareous ramming mass produced with waste refractory materials and its manufacture method |
| CN111333408A (en) * | 2020-03-10 | 2020-06-26 | 北京利尔高温材料股份有限公司 | Regenerated magnesium-aluminum-carbon tundish dry material and preparation method thereof |
| CN111333409A (en) * | 2020-03-11 | 2020-06-26 | 天津瑞利鑫环保科技有限公司 | Regenerated magnesia-carbon tundish dry material and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116023156A (en) * | 2022-12-21 | 2023-04-28 | 海城利尔麦格西塔材料有限公司 | Regeneration method of waste magnesia carbon bricks |
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Application publication date: 20210921 |