Korundum Mullit Dökülebilir

Description of Corundum Mullite Castable

Corundum-mullite castables are refractory products made of high-quality corundum and mullite as core materials. They have the characteristics of high temperature resistance, high mechanical strength, and good thermal shock resistance. They are suitable for high-temperature industrial occasions with high requirements.

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Kerui Corundum Mullite Castable Technical Data Sheet

Item		KRGM-1	KRGM-2	KRGM-3
Al2O3 ≥		70	75	85
SiO2 ≤		25	17	13
Fe2O3 ≤		1	1	1
Bulk Density g/cm3 ≥		2.7	2.8	2.9
0.2MPa Refractoriness Under Load ℃  ≥		1450	1480	1500
Thermal Shock Resistance, Times, (900℃, water-cooling) ≥		25	25	25
Maximum Service Temperature ℃		1550	1550	1600
Linear Dimensional Change % ≤		-0.3	-0.2	-0.2
Cold Crushing Strength Mpa ≥	110℃*24h	100	110	120
	1100℃*3h	100	110	120
	1400℃*3h	115	120	125
MOR ≥	110℃*24h	15	15	15
	1100℃*3h	16	17	18
	1400℃*3h	17	18	19

Advantages of Corundum Mullite Castable

1.High Temperature Resistance: Can endure extreme heat without deformation. 2.Excellent Mechanical Strength: Resist mechanical stress well. 3.Good Thermal Shock Resistance: Withstand rapid temperature changes. 4.Low Thermal Expansion: Minimize dimensional changes during heating.

Construction Methods of Corundum Refractory Castable

Surface Treatment

Make sure the surface of the construction is clean, dry, smooth, and free from other pollutants

Mixing Castables

Mix multiple bags of castables according to the materials needed, and add a certain amount of water to adjust the humidity to meet the humidity requirements of construction

Stirring

Add the mixed castable and adhesive into the mixer, add water, and mix until the color is uniform, and the lumps can be caught by hand without leakage (completed within 30 minutes)

Vibration

The castable should also be poured with a plug-in vibrator or a flat vibrator, and the layer pouring height should not exceed 400mm. Castables applied by vibrating can help eliminate porosity and improve the compactness and strength of the lining.

Curing

The completed construction body should be naturally cured in a dry environment for 5-7 days at a temperature of 5-35℃. Avoid construction body vibration during maintenance.

Application of Corundum Refractory Castables

Corundum mullite castables are applied in steel – making furnaces to resist molten steel and slag corrosion. In glass – melting kilns, they endure high – temperature glass – making processes. They’re also used in cement rotary kilns to maintain structural stability under high – temperature and mechanical stress.