Application cases of wear-resistant refractory bricks in different industries

Wear resistant refractory bricks are widely used in high wear areas of multiple industrial fields due to their excellent high temperature resistance, wear resistance, and chemical erosion resistance. The following are typical application cases and corresponding types of wear-resistant refractory bricks in different industries:

1、 Steel industry

Blast furnace tapping groove and hearth

Application scenario: The blast furnace tapping groove needs to withstand the erosion of high-temperature molten iron (1400-1500 ℃) and slag.

Wear resistant brick type: silicon carbide brick (SiC content ≥ 90%) or corundum silicon carbide composite brick, wear resistance index ≤ 5 cm ³ (ASTM C704), compressive strength ≥ 100MPa.

Advantages: The high hardness of silicon carbide (Mohs 9.5) can resist erosion from molten iron, and its lifespan is 2-3 times longer than traditional high alumina bricks.

Converter lining

Application scenario: The lining of the steelmaking converter is subject to erosion by molten steel, slag, and airflow.

Wear resistant brick type: magnesia carbon brick (MgO ≥ 80%, graphite 10-15%), compressive strength ≥ 50MPa, strong slag erosion resistance.

2、 Cement industry

Transition zone and firing zone of rotary kiln

Application scenario: The temperature in the transition zone of the cement kiln reaches 1200-1400 ℃, and the clinker particles are severely worn.

Wear resistant brick type: Silicon Mo brick (Al ₂ O ∝ ≥ 60%, SiC ≥ 15%) or phosphate bonded high alumina brick, with a wear resistance 40% higher than ordinary high alumina brick.

Case: After a cement plant replaced it with silica bricks, the lifespan of the kiln lining was extended from 8 months to 14 months.

Preheater lining

Application scenario: High temperature airflow carrying raw material particles causes wear and tear.

Wear resistant brick type: Anti peeling high alumina brick (containing ZrO ₂), thermal shock resistance ≥ 30 times (1100 ℃ water cooling).

3、 Glass industry

Glass melting furnace flow hole

Application scenario: Continuous flushing of glass liquid at 1600 ℃, requiring high wear resistance and erosion resistance.

Wear resistant brick type: Electric fused zirconia corundum brick (AZS brick, ZrO ₂ ≥ 33%), with a glass liquid erosion resistance rate of less than 0.5mm/year.

Bottom of tin bath

Application scenarios: Tin flow and mechanical impact.

Wear resistant brick type: Zirconia brick (ZrSiO ₄), resistant to tin liquid erosion and low thermal conductivity.

4、 Nonferrous metal smelting

Aluminum electrolytic cell sidewall

Application scenario: 950 ℃ molten aluminum and electrolyte corrosion.

Wear resistant brick type: Silicon nitride combined with silicon carbide brick (Si ∝ N ₄ - SiC), with compressive strength ≥ 150MPa and a service life of more than 5 years.

Copper smelting furnace slag outlet

Application scenario: High temperature copper slag (1200-1300 ℃) flushing.

Wear resistant brick type: magnesia chrome brick (MgO ≥ 60%, Cr ₂ O ∝ ≥ 8%), with slag erosion resistance depth<1mm/8h.

5、 Chemical and power industries

CFB boiler lining

Application scenario: Circulating fluidized bed boilers are subject to wear from coal ash particles (temperature 900 ℃).

Wear resistant brick type: Corundum mullite brick (Al ₂ O ∝ ≥ 85%), with wear resistance three times that of ordinary high alumina brick.

Garbage incinerator combustion chamber

Application scenario: Dual erosion of acidic gases and slag.

Wear resistant brick type: chromium corundum brick (Cr ₂ O ∝ ≥ 10%), with thermal shock resistance ≥ 20 times (1100 ℃ water cooling).

6、 Other high-temperature industries

Ceramic kiln roller rod: Made of silicon carbide roller rod (SiC ≥ 98%), high temperature resistant (1600 ℃) and resistant to body friction.

Petrochemical cracking furnace lining: using high-purity corundum bricks (Al ₂ O ∝ ≥ 99%), resistant to oil and gas impact and sulfur corrosion.

summary

The selection of wear-resistant refractory bricks should be based on the working conditions, temperature, wear mechanism, and chemical environment. For example:

Extreme wear: Prioritize silicon carbide or corundum bricks (such as blast furnace iron trenches).

High temperature+corrosion: Use zirconia corundum or magnesia chrome bricks (such as glass melting furnaces).

Economic demand: high alumina bricks or silica bricks (such as transition zones in cement kilns).

Future trends include the promotion of nano modified wear-resistant bricks (such as plate-like corundum) and environmentally friendly chromium free materials (such as dolomite bricks).