Coal-charging Hole & Bell Pre-cast Refractory

Main Composition: Al2O3≥45%

Application: Industrial Furnaces and Equipment

Rupture Strength : ≥4Mpa

Color: White

Refractoriness: ≥1700℃

Bulk Density: ≥2.1g/cm3

Capacity: 1000 MT per month

Package: Export wooden pallets and polyboard

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Introduction:
New type coal-charging hole precast has high strength, low thermal conductivity, and good abrasion and erosion resistance. Reduce physical damage and tar and other chemical erosion for the refractory during operation. The working life is up to three years.

Features:
1. Long working life.
2.Self-cleaning function.
3.keep the working area clean.
4.More match with the lid, reduce gas leakage, yellow smoke and pollution.

Application:
It's mainly used for coke oven.

Technical Data:

Item	Glazed
ω(Al₂O₃) /% ≥	45
ω(MgO) / % ≥	2.5
Apparent Porosity / % ≤	28
Bulk Density /g/cm³ ≥	2.1
Cold Crushing Strength / MPa ≥	40
Rupture Strength / MPa ≥	4
Thermal Conductivity/W/(m·K)1000℃ (Heating side) ≤	1.2
Thermal Shock Resistance (1100℃, water cooling) /cycle ≥	50

Item		Normal
ω(Al₂O₃) /% ≥		45
ω(MgO) / % ≥		2.5
Apparent Porosity /% ≤		28
Bulk Density / g/cm³ ≥		2.1
Cold Crushing Strength /MPa ≥	110℃*24h After drying	35
	1350℃*3h After firing	40
Rupture Strength /MPa ≥	110℃*24h After drying	3
	1350℃*3h After firing	4
Thermal Conductivity/W/(m·K)1000℃ (Heating side) ≤		1.2
Thermal Shock Resistance (1100℃, water cooling) / cycle ≥		50

Comparison between new type and traditional type

New Type	Traditional Type
High performance crystalline ceramic refractory materials cover the working surface.	Iron casting
Good thermal insulation	Poor thermal insulation
No coal and coke deposition, self-clean function	Easy to be magnetized, leading to accumulate dust.
The maintenance frequency can be significantly reduced. Keep the working area clean.	Frequent repair and high maintenance cost.
Match with the lid; reduce gas leakage, yellow smoke and pollution, improving the oven roof working condition.	Gas leakage

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