阅读说明：本技术 焦炉用硅质隔热砖及其生产工艺 (Siliceous heat-insulating brick for coke oven and production process thereof ) 是由 孙伟 丁娟 刘成辉 孙日先 牟林山 孙传彬 于 2020-12-31 设计创作，主要内容包括：本发明涉及冶金、化工等热工设备用砖技术领域,且国内首次公开了焦炉用硅质隔热砖,该材料配方的组分及重量成分组成包括：硅石及二氧化硅类的：75％-80％、硅微粉10％-15％,氧化钠：0.1％-0.2％、兰晶石：2％-6％、莫来石：2％-6％、刚玉：1％-3％；硅溶胶5％-10％。该焦炉用硅质隔热砖及其生产工艺,通过添加刚玉,保证热震性能得到一定的提高,高温抗蠕变性较好,保证硅质隔热耐火砖的热稳定性能低,通过增添莫来石和刚玉,进一步保证硅质隔热砖的耐热性能,提高了硅质隔热砖的强度,该硅质隔热砖可直接接触火焰作为内衬结构材料使用,为炼焦炉新的隔热节能结构的设计以及传统高温窑炉结构改造提供保障。(The invention relates to the technical field of bricks for metallurgical, chemical and other thermal equipment, and discloses a siliceous heat-insulating brick for a coke oven for the first time in China, wherein the material formula comprises the following components in parts by weight: silica and silicon dioxide-based: 75-80%, silicon micropowder 10-15%, sodium oxide: 0.1% -0.2%, kyanite: 2% -6%, mullite: 2% -6%, corundum: 1% -3%; 5 to 10 percent of silica sol. According to the siliceous heat-insulating brick for the coke oven and the production process thereof, corundum is added to ensure that the thermal shock performance is improved to a certain extent, the high-temperature creep resistance is better, the low thermal stability of the siliceous heat-insulating refractory brick is ensured, mullite and corundum are added to further ensure the heat resistance of the siliceous heat-insulating brick, the strength of the siliceous heat-insulating brick is improved, the siliceous heat-insulating brick can be directly contacted with flame to be used as a lining structure material, and the design of a new heat-insulating energy-saving structure of the coke oven and the structural improvement of a traditional high-temperature kiln are guaranteed.)

1. The siliceous insulating brick for the coke oven is characterized in that: the material formula comprises the following components in parts by weight: silicon dioxide: 60% -80%, silicon micropowder 10% -15%, sodium oxide: 0.1% -0.2%, kyanite: 2% -6%, mullite: 2% -6%, corundum: 1% -5%, hollow alumina spheres: 8% -20%; silica sol: 5 to 10 percent.

2. The siliceous heat-insulating brick for coke ovens according to claim 1, characterized in that: the material formula comprises the following components in parts by weight: silicon dioxide: 60%, 10% of silicon micropowder, sodium oxide: 0.2%, kyanite: 2%, mullite: 6%, corundum: 5% and alumina hollow spheres: 20 percent; silica sol: 11.7 percent.

3. The siliceous heat-insulating brick for coke ovens according to claim 1, characterized in that: the material formula comprises the following components in parts by weight: silicon dioxide: 70%, silicon micropowder 13%, sodium oxide: 0.2%, kyanite: 3% of mullite: 3% and corundum: 3% of alumina hollow spheres: 15 percent; silica sol: 5.7 percent.

4. The siliceous heat-insulating brick for coke ovens according to claim 1, characterized in that: the material formula comprises the following components in parts by weight: silicon dioxide: 80%, silicon micropowder 16%, sodium oxide: 0.1%, kyanite: 2%, mullite: 2%, corundum: 1% and hollow alumina spheres: 8 percent; silica sol: 6.8 percent.

5. The production process of siliceous heat-insulating brick for coke oven according to claims 1 to 4, characterized by comprising the following steps: the method comprises the following steps:

1) taking silicon dioxide, sodium oxide and sodium oxide, fully stirring and mixing, and adding a certain amount of water glass in the mixing process to continuously mix;

2) selecting and mixing several materials of kyanite, mullite, corundum and alumina hollow spheres, and uniformly mixing silicon dioxide, sodium oxide and additional silica sol according to the proportioning requirement;

3) after the mixture is finished, a material cavity of the forming die is divided into two parts by a partition plate, and the two parts are formed by adopting vibration forming or a press;

4) maintaining the brick blank body at room temperature for 24-48 h, then carrying out demoulding treatment, and drying at 100-120 ℃ for 20-30 h after demoulding;

5) and finally, placing the brick blank into a kiln, and preserving the heat for 20 to 28 hours at 1350 to 1500 ℃ to sinter the brick blank.

6. The siliceous heat-insulating brick for coke ovens according to claim 5, characterized in that: in the early stage of firing, the combustible material is in the stage of combustion at 300-600 ℃, and the temperature needs to be raised slowly.

7. The siliceous heat-insulating brick for coke ovens according to claim 5, characterized in that: the cooling stage adopts slow-fast-slow multi-stage cooling.

Technical Field

The invention relates to the technical field of building bricks, in particular to a siliceous heat-insulating brick for a coke oven and a production process thereof.

Background

Coke ovens, a furnace typically built of refractory bricks and refractory blocks, are used to char coal to produce coke.

The silicon heat-insulating refractory brick is a heat-insulating refractory product which is prepared by taking silica as a main raw material and has the SiO2 content of not less than 91 percent. The siliceous heat-insulating refractory brick has heat-insulating performance, keeps the characteristics of silica brick to a great extent, has high refractoriness under load, slightly expands volume in the heating process, and enhances the integrity of the kiln. The silica heat-insulating refractory brick is produced with fine crushed silica as material and through adding partial waste silica brick or waste silica heat-insulating refractory brick powder, mineralizer, inflammable additive, etc. Adding water into a mixing machine according to a certain proportion to mix into pug, mechanically or manually forming, and placing the dried green bricks into a kiln when the residual moisture is less than 0.5%. In order to prevent the occurrence of cracks in the product due to severe volume expansion caused by the transformation of SiO2 polycrystal, a relatively slow temperature increase and decrease speed is required at the time of firing.

Although the prior siliceous heat-insulating refractory brick has good fire resistance, the prior siliceous heat-insulating refractory brick has poor thermal shock property, poor high-temperature creep resistance and low strength, thereby causing the siliceous heat-insulating refractory brick to have low thermal stability, and providing the siliceous heat-insulating brick for the coke oven and the production process thereof.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a siliceous heat-insulating brick for a coke oven and a production process thereof, which solve the problem that the prior siliceous heat-insulating refractory brick has poor thermal shock performance, poor high-temperature creep resistance and low strength so as to cause low thermal stability performance of the siliceous heat-insulating refractory brick although the refractory strength is good. In order to realize the purposes of ensuring that the thermal shock performance is improved to a certain extent, the high-temperature creep resistance is better, the thermal stability of the siliceous heat-insulating refractory brick is low, the heat resistance of the siliceous heat-insulating brick is further ensured, the strength of the siliceous heat-insulating brick is improved, and the siliceous heat-insulating brick combined by the alumina hollow spheres can be directly contacted with flame to be used as a lining structural material, the invention provides the following technical scheme: the siliceous heat-insulating brick for the coke oven comprises the following components in parts by weight: silicon dioxide: 60% -80%, 10% -20% of silicon micropowder, sodium oxide: 0.1% -0.2%, sodium oxide: 0.1% -0.2%, kyanite: 2% -6%, mullite: 2% -6%, corundum: 1% -5%, hollow alumina spheres: 8% -20%; silica sol: 5 to 10 percent.

Preferably, the material formula comprises the following components in parts by weight: silicon dioxide: 60%, 10% of silicon micropowder, sodium oxide: 0.1, sodium oxide: 0.2%, kyanite: 2%, mullite: 6%, corundum: 5% and alumina hollow spheres: 20 percent; silica sol: 11.7 percent.

Preferably, the material formula comprises the following components in parts by weight: silicon dioxide: 70%, silicon micropowder 13%, sodium oxide: 0.2%, sodium oxide: 0.1%, kyanite: 3% of mullite: 3% and corundum: 3% of alumina hollow spheres: 15 percent; silica sol: 5.7 percent.

Preferably, the material formula comprises the following components in parts by weight: silicon dioxide: 80%, silicon micropowder 16%, sodium oxide: 0.1%, sodium oxide: 0.1%, kyanite: 2%, mullite: 2%, corundum: 1% and hollow alumina spheres: 8 percent; silica sol: 6.8 percent.

Preferably, the process for producing siliceous heat-insulating bricks for coke ovens according to claims 1 to 4, comprising the following steps:

1) taking silicon dioxide, sodium oxide and sodium oxide, fully stirring and mixing, and adding a certain amount of silica sol in the mixing process to continue mixing;

2) mixing materials of kyanite, mullite, corundum and alumina hollow spheres, and uniformly mixing silicon dioxide, sodium oxide and outer silica sol glass according to the proportion requirement;

3) after the mixture is finished, a material cavity of the forming die is divided into two parts by a partition plate, and the two parts are formed by adopting vibration pressurization or mechanical pressing;

4) maintaining the brick blank body at room temperature for 24-48 h, then carrying out demoulding treatment, and drying at 100-120 ℃ for 20-30 h after demoulding;

5) and finally, putting the brick blank into a kiln, and keeping the temperature for 3 to 6 hours at 1350 to 1500 ℃ to sinter.

Preferably, the pre-firing stage is a combustible combustion stage in the period of 300 to 600 ℃, and the temperature needs to be slowly increased;

preferably, the cooling stage adopts slow-fast-slow multi-stage cooling.

Compared with the prior art, the invention provides the siliceous insulating brick for the coke oven and the production process thereof, and the siliceous insulating brick has the following beneficial effects:

the siliceous heat-insulating brick for the coke oven is prepared by mixing silicon dioxide: 60% -80%, 10% -20% of silicon micropowder, sodium oxide: 0.1% -0.2%, kyanite: 2% -6%, mullite: 2% -6%, corundum: 1% -5%, hollow alumina spheres: 8% -20%; silica sol: 5% -10% are mixed according to a certain percentage proportion, then the siliceous insulating brick is formed, then the brick body is subjected to heat preservation and firing, so that the siliceous insulating brick can be obtained, the thermal shock performance is ensured to be improved to a certain extent by adding the alumina hollow spheres, the high-temperature creep resistance is better, the low thermal stability of the siliceous insulating refractory brick is ensured, the heat resistance of the siliceous insulating brick is further ensured by adding mullite corundum, the strength of the siliceous insulating brick is improved, the siliceous insulating brick combined by the alumina hollow spheres can be directly contacted with flame to be used as a lining structural material, and the design of a coke oven structure and the reconstruction of a traditional high-temperature kiln structure are guaranteed.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the contents in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The siliceous heat-insulating brick for the coke oven comprises the following components in parts by weight: silicon dioxide: 60% -80%, 10% -20% of silicon micropowder, sodium oxide: 0.1% -0.2%, kyanite: 2% -6%, mullite: 2% -6%, corundum: 1% -5%, hollow alumina spheres: 8% -20%; silica sol: 5 to 10 percent of

Example 1

The preparation method comprises the following specific steps:

1) and mixing the following silicon dioxide: 60%, 10% -20% of silicon micropowder, sodium oxide: 0.2%, kyanite: 2%, mullite: 6%, corundum: 5% and alumina hollow spheres: 20 percent; silica sol: 11.7 percent of the mixture is put into a stirrer according to a certain proportion, and the mixture is stirred uniformly;

2) after the mixture is finished, a material cavity of the forming die is divided into two parts by a partition board, the two parts are formed by adopting vibration pressurization or mechanical pressing, then the brick blank is maintained for 24-48 h at room temperature, then demoulding treatment is carried out, drying is carried out for 20-30 h at 100-120 ℃ after demoulding, and finally the brick blank is placed in a kiln and is subjected to heat preservation for 3-6 h at 1350-1500 ℃ for sintering.

Example 2

The preparation method comprises the following specific steps:

1) and mixing the following silicon dioxide: 70%, 10% -20% of silicon micropowder, sodium oxide: 0.2%, kyanite: 3% of mullite: 3% and corundum: 3% of alumina hollow spheres: 15 percent; silica sol: 5.7 percent of the mixture is put into a stirrer according to a certain proportion, and the mixture is stirred uniformly;

2) after the mixture is finished, a material cavity of the forming die is divided into two parts by a partition board, the two parts are formed by adopting vibration pressurization or mechanical pressing, then the brick blank is maintained for 24-48 h at room temperature, then demoulding treatment is carried out, drying is carried out for 20-30 h at 100-120 ℃ after demoulding, and finally the brick blank is placed in a kiln and is subjected to heat preservation for 3-6 h at 1350-1500 ℃ for sintering.

Example 2

The preparation method comprises the following specific steps:

1) and mixing the following silicon dioxide: 80%, 10% -20% of silicon micropowder, sodium oxide: 0.1%, kyanite: 2%, mullite: 2%, corundum: 1% and hollow alumina spheres: 8 percent; silica sol: 6.8 percent of the mixture is put into a stirrer according to a certain proportion, and the mixture is stirred uniformly;

2) after the mixture is finished, a material cavity of the forming die is divided into two parts by a partition board, the two parts are formed by adopting vibration pressurization or mechanical pressing, then the brick blank is maintained for 24-48 h at room temperature, then demoulding treatment is carried out, drying is carried out for 20-30 h at 100-120 ℃ after demoulding, and finally the brick blank is placed in a kiln and is subjected to heat preservation for 3-6 h at 1350-1500 ℃ for sintering.

In the early stage of firing, the combustible is in the combustion stage at 300-600 ℃, the temperature needs to be slowly raised to facilitate the discharge of the combustible, otherwise, the combustible is carbonized, and the brick body is black; in the cooling stage, slow-fast-slow multi-stage cooling is adopted, the cooling speed cannot be too fast, otherwise, the bricks are easy to crack.

In summary, after the test operations of the embodiments 1, 2 and 3, the siliceous heat insulating brick with the best quality is selected as the siliceous heat insulating brick for the coke oven, so as to further ensure the heat resistance of the siliceous heat insulating brick and improve the strength of the siliceous heat insulating brick, and the siliceous heat insulating brick combined by the alumina hollow spheres can be directly contacted with flame to be used as the lining structural material.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.