Silica brick for coke oven

Silica brick for coke oven refers to refractory siliceous products with tridymite as the main crystal phase, which are used for the construction of coke ovens. Below is a detailed introduction to Silica brick for coke oven:

1. Main raw materials and ingredients Silica brick for coke oven is mainly made of high-purity silica (SiO2) which has undergone careful processing. The SiO2 content is generally higher than 94%. Its main mineral phases are tridymite and cristobalite. In the production process, quartz sand and refractory clay are also selected as auxiliary raw materials to ensure the quality and performance of Silica brick. 2. Production process The production process of Silica brick for coke oven generally includes the following steps:

Raw material preparation: screening, crushing, grinding and processing raw materials such as silica, quartz sand and refractory clay to ensure that their particle size meets the requirements.

Mixing: put the processed raw materials into the mixer, add a certain amount of water and stir until they are fully mixed and have a certain bonding force.

Molding: The mixed materials are formed through a mold. Common molding methods include pressure molding, extrusion molding and vibration molding.

Firing: The formed Silica bricks are placed in a special kiln for pre-firing to evaporate residual moisture and organic matter and keep the shape of the Silica bricks stable.

Sintering: The fired Silica bricks are placed in a high-temperature furnace for heating, causing the silica and quartz sand contained in them to chemically react to form a more stable silicate structure, thereby enhancing the heat resistance and corrosion resistance of Silica bricks.

3. Main Features

High Refractory: The refractory of Silica bricks is generally higher than 1650°C, and some even reach 1700°C and above. They can withstand the high operating temperatures of coke ovens, usually exceeding 1000°C.

Excellent Acid and Alkali Resistance: Silica bricks have good resistance to acidic and neutral molten substances. Higher Strength: Silica bricks maintain good mechanical strength at high temperatures and are not susceptible to deformation or cracking.

Thermal shock resistance: Silica bricks have high adaptability to temperature changes and are not susceptible to cracking under sudden temperature changes.

Thermal conductivity: Silica bricks have good thermal conductivity, which helps to evenly distribute heat in the furnace and improve the efficiency of the coke oven.

4. Application

Silica brick for coke ovens is mainly used in furnace walls, furnace arches and other parts of coke ovens, playing a role in heat preservation and fire resistance. It is the main material from which the main parts of the coke oven (such as the regenerator wall, ramp, combustion chamber, carbonization chamber, etc.) are made, accounting for 60-70% of the total amount of refractory bricks. In addition, Silica bricks are widely used in high-temperature furnaces, as thermal insulation layers in industrial furnaces, refractory materials, etc.

With the rapid development of the global steel industry, the demand for coke continues to rise, which in turn promotes the prosperity of the coke oven Silica brick market. On the one hand, the demand for Silica bricks in traditional industries such as steel and glass will continue to grow; on the other hand, with the rapid development of new industries such as new energy and new materials, the application fields of coke oven Silica bricks will further expand.

As a key material in the coke oven industry, coke oven Silica bricks have the characteristics of high refractoriness, excellent acid and alkali resistance, high strength, thermal shock resistance and good thermal conductivity. It plays an important role in the structure of the coke oven, ensuring the durability and production efficiency of the furnace body. At the same time, with the development of the world economy, optimization and modernization of the industrial structure, the market of Silica bricks for coke ovens will receive broader development prospects.