Refractory materials refer to inorganic non-metallic material products with a refractoriness of not less than 1580℃. They can maintain their physical shape and chemical stability in a high temperature environment, and will not easily melt, soften, or undergo violent chemical reactions.In simple terms, it is the "liner" or "armor" of high-temperature industrial equipment, which provides kiln lining for high-temperature production processes such as metallurgy, cement, and glass to ensure safe, continuous and efficient production.
Industrial value
- Safety and security: Preventing high-temperature melts (such as molten steel, copper water, and glass liquid) from burning through the furnace body is the first line of defense for safe production at high temperature.
- Process guarantee: Stable refractory lining is the key to ensure the stability of the temperature field and chemical reaction environment in the furnace, which directly affects the quality of the final product.
- Energy efficiency improvement: Excellent refractory materials have excellent thermal insulation properties, which can effectively reduce the heat loss of the kiln and reduce energy consumption costs.
- Cost control: The service life of refractory materials directly determines the maintenance cycle of high-temperature equipment.Longer life means less downtime and maintenance time and lower maintenance costs.
Main application areas
Refractory materials are a typical downstream-driven industry, and their needs are closely related to the development of the high-temperature industry.
1. The iron and steel industry (the largest user, accounting for about 70%)：
Application parts: blast furnaces, hot air furnaces, converters, electric furnaces, ladles, continuous casting tundish, rolling heating furnaces, etc.
Commonly used materials: aluminosilicate (high alumina brick), magnesia-carbon brick, aluminomagnesium-carbon brick, carbon brick, unshaped castable, etc.
2. Building materials industry：
Cement industry: firing belt, transition belt, preheater, etc. of rotary kiln.Alkaline bricks (such as magnesia-iron spinel bricks) and alkali-resistant castable are commonly used.
Glass industry: pool walls, chest walls, fluid holes, etc. of glass furnaces.The material is required to have minimal pollution to the glass liquid, and it is commonly used for fused zirconium corundum bricks, silica bricks, etc.
3. Non-ferrous metal industry：
Smelting of copper, aluminum, zinc, etc.: smelting furnaces, refining furnaces, electrolytic cells, etc.According to the different smelted metals, materials that are resistant to the erosion of specific metal slag are selected.
4. Chemical and electric power industry：
Petrochemical industry: cracking furnaces, conversion furnaces, etc.
Waste incineration: The inner lining of the incinerator needs to resist the corrosion of complex chemicals.
Power industry: the lining of circulating fluidized bed (CFB) boilers.
5. Others: ceramic kilns, kiln carts, kiln tools, etc. for the firing of refractory materials by themselves.
Industry development trends and challenges
Greening and energy saving：
Develop high-efficiency heat insulation materials: such as nanoporous super heat insulation materials, under the premise of ensuring strength, the heat dissipation of the kiln is minimized.
Resource recycling: recycle, classify, and recycle waste refractory materials after use to reduce solid waste and resource consumption.
Longevity and functionalization：
Improve product life: through material composite technology and microstructure design, develop products with stronger erosion resistance and longer life to help downstream customers reduce comprehensive costs.
Functional development: Develop refractory materials with special functions such as purifying molten steel and catalysis.
Unshaped：
The proportion of unshaped refractory materials continues to increase, because it is convenient to construct, has good integrity, has significant energy-saving effects, and is more suitable for the automation and high-efficiency needs of modern industry.
Challenges faced：
Adjustment of production capacity in downstream industries: especially in the steel industry, which has entered the platform period, the demand for refractory materials has shifted from “quantity increase” to “quality increase”.
Environmental pressure: The production process needs to meet increasingly stringent environmental emission standards.
Raw material resource constraints: High-quality natural raw materials such as magnesite and high bauxite are non-renewable resources, and their sustainable supply is a long-term challenge.
summary
Although the refractory industry is not as “glamorous” as new materials, it is an indispensable behind-the-scenes hero to support the basic industries of the national economy.With the transformation of China's manufacturing industry to high-end and green, the refractory industry is also developing with high quality in the direction of longevity, energy saving, environmental protection and functionalization.
