Service,Zhengzhou Zhongkeda Refractory Materials Co., Ltd

1.Refractory for Dry Quenching Coke Ovens

Engineered for CDQ systems: high thermal shock resistance, wear and corrosion resistance, high-temperature strength, and dimensional accuracy — ensuring long-life and safe operation.
Main Types of Refractory Bricks for CDQ Furnaces：

Type	Composition	Typical Application Area	Key Advantages
Alumino-Silicate Refractory Brick	Al₂O₃ (50–70%) + SiO₂	Pre-chamber, low-temperature cooling zone	Cost-effective, moderate thermal shock resistance, suitable for areas with minimal temperature fluctuations
Silicon Carbide–Corundum Composite Brick	SiC (50–80%) + Al₂O₃	Annular flue, high-temperature cooling section	Excellent thermal conductivity and abrasion resistance, strong resistance to CO corrosion
Mullite-Bonded Silicon Carbide Brick	SiC + 3Al₂O₃·2SiO₂ (Mullite)	High-temperature gas inlet, coke flow zone	Exceptional thermal shock resistance, high resistance to coke erosion
Silicon Nitride–Bonded Silicon Carbide Brick	SiC + Si₃N₄	Coke impact zones (e.g. inclined chute)	Ultra-high mechanical strength (>60 MPa), excellent impact resistance
Chrome Corundum Brick	Al₂O₃ (≈90%) + Cr₂O₃	High thermal load zones (e.g. combustion chamber)	High refractoriness (>1600°C), excellent resistance to alkali vapor corrosion

COQ Coke Oven Case:

2.Refractory for Iron Making

Refractory materials for ironmaking must offer high-temperature resistance, thermal shock resistance, corrosion resistance, and dimensional precision. Material selection should be tailored to specific operating conditions to ensure extended equipment lifespan and cost-effective performance.
Refractory Applications & Types in Steelmaking：

Basic Oxygen Furnace (BOF)
Application Area	Refractory Type	Key Composition	Performance Advantages
– Furnace Lining	Magnesia-Carbon Brick (MgO–C)	MgO (70–85%) + Graphite (10–20%)	Excellent slag resistance (high MgO), oxidation resistance (graphite coating), and superior thermal shock resistance.
– Trunnion Area	Magnesia-Calcium Brick (MgO–CaO)	MgO (60–75%) + CaO (15–25%)	Resists high-basicity slag corrosion and reduces slag splashing adhesion.
– Taphole	Alumina–Silicon Carbide Brick (Al₂O₃–SiC)	Al₂O₃ (≈70%) + SiC (≈20%)	Withstands high-temperature molten steel erosion and offers strong thermal shock resistance.

Electric Arc Furnace (EAF)
Application Area	Refractory Type	Key Composition	Performance Advantages
– Furnace Wall / Bottom	Magnesia-Carbon Brick (MgO–C)	MgO (75–90%) + Graphite (8–15%)	Excellent resistance to electric arc heating (>1700°C) and oxidative slag attack.
– Furnace Roof	High Alumina Brick	Al₂O₃ (80–90%)	Resists high-temperature gas erosion and offers good volume stability.
– Hotspot Area	Gunning Mix	MgO / Al₂O₃ + Binder	Convenient repair material with good adherence, used for thermal stress zones.

Ladle
Application Area	Refractory Type	Key Composition	Performance Advantages
– Working Lining	Alumina-Magnesia-Carbon Brick (Al₂O₃–MgO–C)	Al₂O₃ (60–70%) + MgO (10–15%) + C	Resists slag attack (MgO), thermal shock (C), and steel penetration.
– Slag Line Area	Magnesia-Carbon Brick (MgO–C)	MgO (80–90%) + Graphite (10–15%)	Excellent resistance to high-basicity slag; extends slag line life.
– Porous Plug (Bottom)	Alumina–Spinel Brick (Al₂O₃–Spinel)	Al₂O₃ (≈85%) + MgAl₂O₄ (Spinel)	High permeability, strong resistance to steel infiltration, ensures uniform argon blowing.

Tundish
Application Area	Refractory Type	Key Composition	Performance Advantages
– Working Lining	Magnesia-Calcia Coating (MgO–CaO)	MgO (50–70%) + CaO (20–30%)	High CaO reactivity adsorbs inclusions, improving steel cleanliness.
– Dam/Weir	Mullite Brick	3Al₂O₃·2SiO₂	Excellent thermal shock resistance; reduces steel turbulence.

Continuous Casting (CCM)
Application Area	Refractory Type	Key Composition	Performance Advantages
– Submerged Entry Nozzle (SEN)	Zirconia-Carbon Material (ZrO₂–C)	ZrO₂ (60–75%) + C (20–30%)	Inert ZrO₂ resists steel erosion and prevents Al₂O₃ clogging.
– Ladle Shroud / Stopper Rod	Alumina-Carbon Material (Al₂O₃–C)	Al₂O₃ (70–80%) + C (15–20%)	Withstands molten steel flow and thermal shocks effectively.

Iron Making Case:

3.Refractory for Carbon Industry

In the carbon industry, refractory materials must focus on ultra-high temperature resistance, reduction resistance, and anti-carbon penetration. Customized material selection based on equipment conditions—combined with material innovation and structural optimization—enables efficient, long-lasting, and low-consumption operation of industrial systems.
Commonly used refractory materials in the carbon industry and their performance:

Material Type	Main Components	Application Area	Core Performance Advantages
High-Purity Graphite Brick	C ≥ 99.9%	Lining of graphitization furnaces	Exceptional thermal stability (up to 3000°C), resistance to CO reducing atmosphere
Silicon Carbide Brick (SiC)	SiC ≥ 90%	Firing flue walls, exhaust ducts	High thermal conductivity (15–25 W/m·K), excellent wear and thermal shock resistance
Silicon Nitride Bonded SiC Brick	SiC (70–80%) + Si₃N₄	Kiln car bearing plates, electrode supports	Ultra-high strength (>100 MPa), resistance to mechanical impact
Fused Corundum-Mullite Brick	Al₂O₃ (70%) + 3Al₂O₃·2SiO₂ (Mullite)	Insulating layer of carburation furnaces	Excellent thermal shock resistance (>30 cycles), low thermal conductivity (<1.5 W/m·K)
Alumina Hollow Ball Brick	Al₂O₃ ≥ 99% (hollow sphere structure)	Outer insulation of carbon fiber furnaces	Ultra-lightweight (density 0.8–1.2 g/cm³), outstanding high-temperature insulation
Self-bonded SiC Castable	SiC (75%) + Silica Sol Binder	Complex shape repairs	Rapid installation, resistance to asphalt volatile infiltration

Carbon industry case

4.Refractory for Glass Industry

Refractories for the glass industry must prioritize corrosion resistance, low contamination, and high stability. Material selection should be tailored to specific glass types (soda-lime, borosilicate, lead glass, etc.) and furnace structures. Through material innovation and structural optimization, furnace lifespan can be significantly extended (from 5 to 10 years), while reducing energy consumption and production costs.
Common Types and Properties of Refractories for the Glass Industry

Material Type	Main Components	Application Area	Key Advantages	Max. Service Temp.
Fused Cast AZS Brick	ZrO₂ (33–41%) + Al₂O₃ + SiO₂	Glass contact zones (melter walls, throat)	Excellent corrosion resistance, low glass contamination	1700°C
α-β Alumina Brick	Al₂O₃ ≥99% (mainly β-Al₂O₃ phase)	Superstructure, breast wall	Alkali vapor resistance, outstanding volume stability	1800°C
Silica Brick	SiO₂ ≥93%	Crown (melter dome)	High hot strength, cost-effective	1650°C
Magnesia-Alumina Spinel	MgO 30% + Al₂O₃ 70%	Regenerator checkers, sidewalls	Excellent thermal shock resistance, alkali dust resistance	1500°C
Mullite Brick	3Al₂O₃·2SiO₂	Feeder channel, annealing lehr	Thermal shock resistance, low thermal conductivity (1.5–2.0 W/m·K)	1500°C
Dense Chrome Brick	Cr₂O₃ ≥95%	Specialty glass furnaces (e.g., opal glass)	High resistance to boron/fluorine corrosion, acid glass stability	1750°C

Glass Industry Case

5.Refractory for Cement Industry

Refractories for cement kilns must focus on spalling resistance, high-temperature durability, and chemical corrosion resistance. Material selection should be customized based on kiln type and process conditions (e.g., high-sulfur fuels, alternative fuels). Through material innovation and intelligent maintenance, kiln lining lifespan can be significantly extended (from 1 year to over 3 years), reducing refractory cost per ton of cement by more than 25%.
Common Refractories for Cement Kilns and Their Properties

Material Type	Main Components	Application Area	Key Advantages	Max Temp
Magnesia-Alumina Spinel Brick	MgO 20–30% + Al₂O₃ 70–80%	Sintering & Transition Zone (Rotary Kiln)	Excellent clinker resistance, superior anti-spalling	1600°C
High Alumina Brick	Al₂O₃ 60–80%	Preheater, Calciner	Alkali & sulfur resistance, cost-effective	1500°C
Silicon Carbide Brick	SiC ≥85%	Cooler Hot Zone, Kiln Mouth	Exceptional wear resistance (HV≥2500), thermal shock resistant	1400°C
Anti-Spalling Castable	Al₂O₃ 70% + MgO 10%	Kiln Mouth, Tertiary Air Duct	Fast installation, thermal shock resistance, anti-build-up	1450°C
SiC-Mullite Brick	SiC 30% + Mullite (3Al₂O₃·2SiO₂)	Preheater Cone, Calciner	Dual resistance: alkali-sulfur & abrasion	1350°C
Insulating Brick	Al₂O₃ 40–50% + Hollow Ball Structure	Kiln Outer Layer Insulation	Low thermal conductivity (≤1.0 W/m·K), energy-saving	1200°C

Cement Kiln Industry Case: