CN112457031A - Low-creep high-alumina brick and preparation method thereof - Google Patents
Low-creep high-alumina brick and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a low-creep high-alumina brick and a preparation method thereof, wherein the low-creep high-alumina brick comprises the following raw materials in parts by weight: 50-60 parts of high-alumina material, 5-20 parts of high-alumina powder, 5-20 parts of alumina powder, 0-20 parts of sillimanite powder, 5-20 parts of andalusite powder and 5-15 parts of Guangxi white mud. Mixing and uniformly stirring the high-alumina material, the high-alumina powder, the sillimanite powder and the andalusite powder according to the proportion, adding a proper amount of water, stirring for ten minutes, adding Guangxi white mud, mixing and stirring for ten minutes; and pressing and forming the mixed pug, and drying and sintering to obtain a finished product. The low-creep high-alumina brick has the advantages of high compressive strength and low creep, and the preparation method is simple, low in cost and convenient for batch production.
Description
Technical Field
The invention relates to the technical field of high-alumina bricks, in particular to a low-creep high-alumina brick and a preparation method thereof.
Background
High alumina brick is one of the refractory materials, and the main component of the refractory brick is Al2O 3. The method is mainly used for building the linings of blast furnaces, hot blast stoves, electric furnace tops, blast furnaces, reverberatory furnaces and rotary kilns. In addition, the high-alumina brick is widely used as open hearth regenerative checker brick, plug for casting system, nozzle brick, etc. The high alumina bricks need to have a certain compressive strength and low creep to prevent bulk settling in the furnace during use. The insufficient supply and grade of the existing raw materials result in that the performance of the traditional high-alumina brick is still to be improved.
Disclosure of Invention
The invention aims to provide a low-creep high-alumina brick and a preparation method thereof, and the improvement of the performance of the high-alumina brick is realized.
In order to realize the purpose, the invention provides a low-creep high-alumina brick which comprises the following raw materials in parts by weight: 50-60 parts of high-alumina material, 5-20 parts of high-alumina powder, 5-20 parts of alumina powder, 0-20 parts of sillimanite powder, 5-20 parts of andalusite powder and 5-15 parts of Guangxi white mud.
Preferably, the feed comprises the following raw materials in parts by weight: 52 parts of high-alumina material, 14 parts of high-alumina powder, 10 parts of alumina powder, 7 parts of sillimanite powder, 7 parts of andalusite powder and 10 parts of Guangxi white mud.
Preferably, the feed comprises the following raw materials in parts by weight: 55 parts of high-alumina material, 14 parts of high-alumina powder, 10 parts of alumina powder, 7 parts of sillimanite powder, 7 parts of andalusite powder and 7 parts of Guangxi white mud.
Preferably, the feed comprises the following raw materials in parts by weight: 52 parts of high-alumina material, 14 parts of high-alumina powder, 10 parts of alumina powder, 14 parts of andalusite powder and 10 parts of Guangxi white mud.
Preferably, the content of Al2O3 in the high-aluminum material is not less than 70%, and the content of Fe2O3 is not more than 2%; the content of Al2O3 in the high-alumina powder is not less than 80%, and the content of Fe2O3 in the high-alumina powder is not more than 2%. (ii) a The content of Al2O3 in the alumina powder is not less than 99%, and the content of Fe2O3 in the alumina powder is not more than 0.1%. (ii) a The content of Al2O3 in the sillimanite powder is not less than 56 percent, and the content of Fe2O3 in the sillimanite powder is not more than 1.0 percent; the content of Al2O3 in the andalusite powder is not lower than 55%, and the content of Fe2O3 is not higher than 1.5%; the content of Al2O3 in Guangxi white mud is not less than 34%, and the content of Fe2O3 in Guangxi white mud is not more than 1.5%.
A preparation method of a low-creep high-alumina brick comprises the following steps: step 1, mixing and uniformly stirring a high-alumina material, a high-alumina powder, an alumina powder, a sillimanite powder and andalusite powder according to a ratio, adding a proper amount of water, stirring for ten minutes, adding Guangxi white mud, mixing and stirring for ten minutes; and 2, pressing and forming the mixed pug obtained in the step 1, and drying and sintering to obtain a finished product.
Preferably, in step 2, after the mixed pug is pressed and molded, the mixed pug is dried for eight hours at 130 ℃, and then is fired for twelve hours at 1430 ℃ and 1470 ℃.
The invention has the following advantages:
the low-creep high-alumina brick has the advantages of high compressive strength and low creep rate, and the preparation method is simple, low in cost and convenient for batch production.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
FIG. 1 is a table comparing the performance levels of the high alumina brick of the present invention with conventional low creep high alumina brick DRL-130.
Detailed Description
Preferred embodiments of the present invention will be described in detail with reference to the following examples. It is to be understood that the following examples are given for illustrative purposes only and are not intended to limit the scope of the present invention. Various modifications and substitutions may be made by those skilled in the art without departing from the spirit and scope of the invention, and all such modifications and substitutions are intended to be within the scope of the claims.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
A low-creep high-alumina brick comprises the following raw materials in parts by weight: 50-60 parts of high-alumina material, 5-20 parts of high-alumina powder, 5-20 parts of alumina powder, 0-20 parts of sillimanite powder, 5-20 parts of andalusite powder and 5-15 parts of Guangxi white mud. Wherein the content of Al2O3 in the high-aluminum material is not less than 70%, and the content of Fe2O3 is not more than 2%; the content of Al2O3 in the high-alumina powder is not less than 80%, and the content of Fe2O3 in the high-alumina powder is not more than 2%. (ii) a The content of Al2O3 in the alumina powder is not less than 99%, and the content of Fe2O3 in the alumina powder is not more than 0.1%. (ii) a The content of Al2O3 in the sillimanite powder is not less than 56 percent, and the content of Fe2O3 in the sillimanite powder is not more than 1.0 percent; the content of Al2O3 in the andalusite powder is not lower than 55%, and the content of Fe2O3 is not higher than 1.5%; the content of Al2O3 in Guangxi white mud is not less than 34%, and the content of Fe2O3 in Guangxi white mud is not more than 1.5%.
When the high-alumina brick is prepared, mixing and uniformly stirring a high-alumina material, high-alumina powder, sillimanite powder and andalusite powder according to a ratio, adding a proper amount of water, stirring for ten minutes, adding Guangxi white mud, mixing and stirring for ten minutes; and adding Guangxi white mud, mixing and stirring for ten minutes to obtain the mixed pug. And pressing and forming the mixed pug, and drying and sintering to obtain a finished product. Preferably, after the mixed pug is pressed and molded, the mixed pug is dried for eight hours at the temperature of 130 ℃ and then is fired for twelve hours at the temperature of 1430-.
The invention has the advantages of easily obtained production raw materials, low cost, simple preparation method and convenient mass production. The high-alumina brick produced by the preparation method can effectively reduce the creep rate of the traditional high-alumina brick, improve the compressive strength of the traditional high-alumina brick, and simultaneously can effectively reduce the impurity content of the traditional high-alumina brick and reduce the erosion of external factors to the brick.
As shown in fig. 1, specifically:
example 1
A low-creep high-alumina brick comprises the following raw materials in parts by weight: 52 parts of high-alumina material, 14 parts of high-alumina powder, 10 parts of alumina powder, 7 parts of sillimanite powder, 7 parts of andalusite powder and 10 parts of Guangxi white mud.
Mixing and uniformly stirring the high-alumina material, the high-alumina powder, the sillimanite powder and the andalusite powder according to the proportion, adding a proper amount of water, stirring for ten minutes, adding Guangxi white mud, mixing and stirring for ten minutes; and adding Guangxi white mud, mixing and stirring for ten minutes to obtain the mixed pug. And pressing and forming the mixed pug, and drying and sintering to obtain a finished product. Preferably, after the mixed pug is pressed and molded, the mixed pug is dried for eight hours at the temperature of 130 ℃ and then is fired for twelve hours at the temperature of 1430-.
The volume density of the high-alumina brick prepared by the embodiment is not less than 2.4g/cm3The normal temperature compressive strength is not less than 70MPa, and the creep rate at 1300 ℃ under the condition of heat preservation for 50h is less than 0.5 percent.
Example 2
A low-creep high-alumina brick comprises the following raw materials in parts by weight: 55 parts of high-alumina material, 14 parts of high-alumina powder, 10 parts of alumina powder, 7 parts of sillimanite powder, 7 parts of andalusite powder and 7 parts of Guangxi white mud.
Mixing and uniformly stirring the high-alumina material, the high-alumina powder, the sillimanite powder and the andalusite powder according to the proportion, adding a proper amount of water, stirring for ten minutes, adding Guangxi white mud, mixing and stirring for ten minutes; and adding Guangxi white mud, mixing and stirring for ten minutes to obtain the mixed pug. And pressing and forming the mixed pug, and drying and sintering to obtain a finished product. Preferably, after the mixed pug is pressed and molded, the mixed pug is dried for eight hours at the temperature of 130 ℃ and then is fired for twelve hours at the temperature of 1430-.
The volume density of the high-alumina brick prepared by the embodiment is not less than 2.4g/cm3The normal temperature compressive strength is not less than 75MPa, and the creep rate at 1300 ℃ under the condition of heat preservation for 50h is less than 0.45 percent.
Example 3
A low-creep high-alumina brick comprises the following raw materials in parts by weight: 52 parts of high-alumina material, 14 parts of high-alumina powder, 10 parts of alumina powder, 14 parts of andalusite powder and 10 parts of Guangxi white mud.
Mixing and uniformly stirring the high-alumina material, the high-alumina powder, the alumina powder and the andalusite powder according to the proportion, adding a proper amount of water, stirring for ten minutes, adding Guangxi white mud, mixing and stirring for ten minutes; and adding Guangxi white mud, mixing and stirring for ten minutes to obtain the mixed pug. And pressing and forming the mixed pug, and drying and sintering to obtain a finished product. Preferably, after the mixed pug is pressed and molded, the mixed pug is dried for eight hours at the temperature of 130 ℃ and then is fired for twelve hours at the temperature of 1430-.
The volume density of the high-alumina brick prepared by the embodiment is not less than 2.35g/cm3The normal temperature compressive strength is not less than 65MPa, and the creep rate at 1300 ℃ under the condition of heat preservation for 50h is less than 0.5 percent.
Claims (7)
1. The low-creep high-alumina brick is characterized by comprising the following raw materials in parts by weight: 50-60 parts of high-alumina material, 5-20 parts of high-alumina powder, 5-20 parts of alumina powder, 0-20 parts of sillimanite powder, 5-20 parts of andalusite powder and 5-15 parts of Guangxi white mud.
2. The low-creep high-alumina brick according to claim 1, comprising the following raw materials in parts by weight: 52 parts of high-alumina material, 14 parts of high-alumina powder, 10 parts of alumina powder, 7 parts of sillimanite powder, 7 parts of andalusite powder and 10 parts of Guangxi white mud.
3. The low-creep high-alumina brick according to claim 1, comprising the following raw materials in parts by weight: 55 parts of high-alumina material, 14 parts of high-alumina powder, 10 parts of alumina powder, 7 parts of sillimanite powder, 7 parts of andalusite powder and 7 parts of Guangxi white mud.
4. The low-creep high-alumina brick according to claim 1, comprising the following raw materials in parts by weight: 52 parts of high-alumina material, 14 parts of high-alumina powder, 10 parts of alumina powder, 14 parts of andalusite powder and 10 parts of Guangxi white mud.
5. The low creep high alumina brick of claim 1, wherein: the content of Al2O3 in the high-aluminum material is not less than 70%, and the content of Fe2O3 is not more than 2%; the content of Al2O3 in the high-alumina powder is not less than 80%, and the content of Fe2O3 in the high-alumina powder is not more than 2%. (ii) a The content of Al2O3 in the alumina powder is not less than 99%, and the content of Fe2O3 in the alumina powder is not more than 0.1%. (ii) a The content of Al2O3 in the sillimanite powder is not less than 56 percent, and the content of Fe2O3 in the sillimanite powder is not more than 1.0 percent; the content of Al2O3 in the andalusite powder is not lower than 55%, and the content of Fe2O3 is not higher than 1.5%; the content of Al2O3 in Guangxi white mud is not less than 34%, and the content of Fe2O3 in Guangxi white mud is not more than 1.5%.
6. A method of making a low creep high alumina brick according to any one of claims 1 to 5, comprising the steps of:
step 1, mixing and uniformly stirring a high-alumina material, a high-alumina powder, an alumina powder, a sillimanite powder and andalusite powder according to a ratio, adding a proper amount of water, stirring for ten minutes, adding Guangxi white mud, mixing and stirring for ten minutes;
and 2, pressing and forming the mixed pug obtained in the step 1, and drying and sintering to obtain a finished product.
7. The method of making a low creep high alumina brick according to claim 6, wherein: in the step 2, after the mixed pug is pressed and molded, the mixed pug is dried for eight hours at the temperature of 130 ℃ and then is fired for twelve hours at the temperature of 1430-.
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Cited By (3)
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| CN113307608A (en) * | 2021-05-26 | 2021-08-27 | 郑州四方耐火材料有限公司 | Low-creep high-alumina brick and preparation method thereof |
| CN114014639A (en) * | 2021-12-22 | 2022-02-08 | 郑州光大耐火材料有限公司 | Low-creep high-alumina brick for hot blast stove and preparation method thereof |
| CN114180947A (en) * | 2021-12-20 | 2022-03-15 | 新密市正兴耐火材料有限公司 | Anti-erosion alkali-resistant brick |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113307608A (en) * | 2021-05-26 | 2021-08-27 | 郑州四方耐火材料有限公司 | Low-creep high-alumina brick and preparation method thereof |
| CN114180947A (en) * | 2021-12-20 | 2022-03-15 | 新密市正兴耐火材料有限公司 | Anti-erosion alkali-resistant brick |
| CN114014639A (en) * | 2021-12-22 | 2022-02-08 | 郑州光大耐火材料有限公司 | Low-creep high-alumina brick for hot blast stove and preparation method thereof |
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