In modern industrial production, coke oven is the core equipment in the coking process, and its stable operation is very important for the production of steel and other industries. As the key refractory of coke oven, silica brick plays an irreplaceable role in it. This paper will introduce in detail the characteristics, application and importance of silicon brick for coke oven.

I. Characteristics of Silicon Brick for Coke Oven

The silica brick used for coke oven is a kind of silica refractory brick specially designed for coke oven. Its main component is silica (SiO₂), and its content is usually above 94%. This kind of high-purity silica endows the silica brick with a series of excellent properties, which enables it to meet the requirements of coke oven under harsh conditions such as high temperature, strong reducing atmosphere and frequent temperature changes.

(1) High fire resistance

The refractoriness of silica brick used in coke oven is extremely high, generally above 1650℃, which can withstand the high temperature environment produced by coke oven during coking. This high refractoriness ensures that the silicon brick will not soften or melt under the action of high temperature for a long time, thus ensuring the structural stability and service life of the coke oven.

(2) Good acid slag corrosion resistance

In the coking process of coke oven, a large amount of acid slag will be produced. These acidic slags have a strong corrosive effect on refractories. Silica brick for coke oven has good resistance to acid slag corrosion because its main component is silica. The chemical properties of silicon dioxide are similar to those of acid slag, which can effectively resist the erosion of acid slag, reduce the wear and damage of brick body and prolong the service life of coke oven.

(3) High volume stability

During the operation of coke oven, the temperature changes frequently and violently. This temperature change will lead to the change of refractory volume, which will affect the structural stability of coke oven. Silicon brick for coke oven has high volume stability, and its expansion coefficient is low at high temperature, which can keep the volume relatively stable when the temperature changes. This high volume stability is helpful to reduce the cracks and deformation caused by temperature changes during the operation of the coke oven and ensure the normal operation of the coke oven.

II. Application of Silicon Brick for Coke Oven

Silicon bricks for coke ovens are mainly used in key parts such as the bottom of coke ovens and furnace walls. These parts directly bear the combustion of high-temperature coke and the erosion of acid slag, which requires extremely high performance of refractories. Silicon brick for coke oven can effectively meet the requirements of these parts and ensure the stable operation of coke oven with its excellent performance.

(1) Furnace bottom

The bottom of the coke oven is the main part that bears the high-temperature coke combustion, and the temperature is extremely high and it is in a high temperature state for a long time. The high refractoriness and high volume stability of silicon brick for coke oven enable it to withstand the high temperature environment at the bottom of the furnace, and at the same time, its good acid slag corrosion resistance can effectively resist the corrosion of acid slag generated during coke combustion, ensuring the structural stability and service life of the bottom of the furnace.

(2) Furnace wall

The furnace wall of coke oven is an important part of coke oven, and its main function is to keep the sealing and heat preservation of coke oven. Silicon bricks for coke ovens can effectively resist the erosion of the furnace wall by the heat generated by high-temperature coke combustion, and at the same time, their high volume stability can ensure the structural stability of the furnace wall when the temperature changes, and reduce the generation of cracks and deformation. In addition, the corrosion resistance of silicon brick for coke oven can also effectively resist the corrosion of furnace wall by acid slag produced during coke combustion, and prolong the service life of furnace wall.

III. Importance of silica bricks for coke ovens

The application of silicon brick for coke oven is of great significance. It can not only ensure the stable operation of the coke oven and improve its service life, but also improve the production efficiency and product quality in the coking process.

(1) to ensure the stable operation of the coke oven

The high refractoriness, good acid slag corrosion resistance and high volume stability of silicon brick for coke oven enable it to maintain stable operation under harsh conditions such as high temperature, strong reducing atmosphere and frequent temperature changes of coke oven. This stability is helpful to reduce the faults and accidents in the operation of coke oven, ensure the normal production of coke oven and improve the production efficiency of coke oven.

(2) to improve the service life of coke ovens

The excellent performance of silicon brick for coke oven enables it to effectively resist all kinds of erosion and damage caused by coke oven during operation. By using silicon brick for coke oven, the service life of coke oven can be significantly improved, the frequency of maintenance and replacement of coke oven can be reduced, and the coking production cost can be reduced.

(3) Improve the production efficiency and product quality in the coking process.

The high volume stability of silica brick for coke oven can ensure the coke oven to maintain good sealing and heat preservation during operation. This kind of good sealing and heat preservation is helpful to improve the thermal efficiency of coking process, accelerate the ripening speed of coke and improve the quality of coke. At the same time, the stability of silicon brick for coke oven can also reduce the cracks and deformation of coke oven during operation, ensure the normal operation of coke oven, and thus improve the production efficiency of coking process.

IV. Production and Quality Control of Silicon Brick for Coke Oven

The production of silicon brick for coke oven needs strict quality control to ensure that its performance can meet the requirements of coke oven. In the production process, it is necessary to strictly control the selection of raw materials, the control of production technology and the inspection of product quality.

(1) Selection of raw materials

The main raw material of silica brick for coke oven is silica with high silica content. When selecting raw materials, it is necessary to strictly control the silica content and impurity content of silica to ensure the quality of raw materials meets the requirements. In addition, the granularity and purity of raw materials need to be strictly tested to ensure that the performance of raw materials can meet the production requirements.

(2) Production process control

The production process of silicon brick for coke oven includes batching, molding, drying and firing. In the process of batching, it is necessary to accurately control the proportion of various raw materials according to the performance requirements of the product to ensure that the chemical composition and physical properties of the product meet the requirements. In the molding process, it is necessary to strictly control the molding pressure and molding time to ensure the density and strength of the brick. During the drying process, it is necessary to control the drying temperature and time reasonably to prevent the brick from cracking and deformation during the drying process. In the firing process, it is necessary to strictly control the firing temperature and time to ensure the firing quality of the brick.

(3) product quality inspection

The quality inspection of silicon brick for coke oven is a key link to ensure product quality. In the process of quality inspection, it is necessary to comprehensively test the chemical composition, physical properties and appearance quality of products. Chemical composition detection mainly includes the detection of silica content, ferric oxide content and other indicators to ensure that the chemical composition of the product meets the requirements. Physical performance testing mainly includes the detection of refractoriness, acid slag corrosion resistance, volume stability, cold pressing strength and other indicators to ensure that the physical properties of products can meet the requirements of coke oven use. Appearance quality inspection mainly includes the detection of indicators such as dimensional deviation and appearance defects of brick bodies to ensure that the appearance quality of products meets the requirements.

V. Future development direction

With the continuous development of modern industry, silicon bricks for coke ovens are constantly undergoing technological innovation and product upgrading. In the future, the development direction of silicon brick for coke oven will mainly focus on the following aspects:

(1) improve product performance

By improving the production process and raw material formula, the performance indexes such as refractoriness, acid slag corrosion resistance and volume stability of silicon brick for coke oven are further improved to meet the requirements of higher temperature and more harsh environment.

(2) the development of new products

Research and develop new silicon brick products for coke oven, such as silicon brick with higher strength and better thermal shock resistance, and silicon brick products that can adapt to special furnace type and process requirements to meet the needs of different users.

(3) Green production

In the production process, we should pay attention to energy conservation and environmental protection, adopt advanced production technology and equipment, reduce energy consumption and pollutant emission, and realize the green and sustainable development of silicon brick production for coke oven.

As an important refractory, silica brick for coke oven plays an irreplaceable role in modern coke oven production. Its excellent performance and wide application make it a key material for stable operation of coke oven. With the continuous progress and innovation of technology, silicon brick for coke oven will play a more important role in future industrial production and make greater contributions to the development of modern industry.