Tabular alumina 8-14mesh for fire bricks

 

Tabular alumina 8-14mesh for fire bricks is a sintered aluminum oxide produced by a rapid & intensive sintering process at high temperature 1950 C. High Al2O3 chemical purity and low porous rate are significant features of tabular alumina.

by the sintering method, the compacted alumina crystals formed in a tabular staggered way, which increases the mechanical strength of the particles. the unique low porosity structure results in a low water absorption.

Tabular alumina has characteristic large, well developed hexagonal tablet shaped α-alumina crystals of 50-400um length. the tabulated structure is visible from appearance by eyes.

Properties:

1.    Complete crystallization, High purity up to 99.5% Al2O3

2.    Low apparent porosity 2-5%. the small pores are distributed in the surface and internal of crystals evenly.

3.    Good resistance to alkalis and mineral acids

4.    Low water absorption less than 1%

5.    High hardness and toughness

6.    High thermal conductivity

7.    Excellent thermal shock resistance

8.    Superior wear resistance,creep resistance, and slag resistance

9.    High volume stability

10. High anti-bending strength

Technical data:

Typical physical properties
Specific gravity			3.96 g/cm3
Bulk density			3.45-3.5g/cm3
Apparent porosity			2-5%
Water absorption rate			0.7-1.5%
Mohs' Hardness			9.0
Knoop hardness			2000kg/cm3
Thermal conductivity			(100 C)0.069 cal/sec cm C
Heat capacity			(20 C )0.21cal/gm/(100 C)
Melting temperature			2050 C
Max. Service temperature			Min 1800 C
Refractive Index			1.76
Appearance			White granules or powder
Chemical composition(%)
Index		AL2O3		SiO2		Fe2O3		Na2O
Guarantee Value		Min 99.2		Max 0.18		Max 0.1		Max 0.4
Typical Value		99.45		0.05		0.02		0.32
Key Physical Index
Index	Bulk density(g/cm3)				Porosity(%)		Water absorption rate(%)
Guarantee Value	Min 3.5				Max 5.0		Max 1.5
Typical Value	3.56				2.35		0.72

 

Particle Size Distribution

Size: mm	Distribution	Typical Values %	MAX/MIN %
5-10mm	5-10mm	92	75
	7-10mm	58	40
	5-7mm	35	20
3-6mm	3-6mm	98	90
	4-6mm	55	40
	3-4mm	44	20
1-3mm	1-3mm	99	90
	2-3mm	52	30
	1-2mm	47	30
1-2mm	+2.36mm	8	10
	-1mm	5	10
0.5-1mm	0.5-1.18mm	95	90
	0.7-1.18mm	45	35
	0.5-0.7mm	50	20
0.2-0.6mm	+0.6mm	5	10
	-0.2mm	4	10
0-0.5mm	0-0.5mm	95	90
	0.15-0.5mm	49	38
-200#	+0.088mm	0.3	3
	-0.044mm	96	90
-325#	-0.044mm	97	85

 

Available Sizes

Fraction	0-30mm,30-10mm,12-6mm,10-8mm,8-5mm,5-3mm,3-1mm,2-1mm,1-0mm,1-0.5mm,0.5-0.2mm,0.5-0mm,0.3-0mm
Fine	46mesh-0,60mesh-0,80mesh-0,100mesh-0,120mesh-0,150mesh-0,180mesh-0,200mesh-0,240mesh-0,270mesh-0
Customized size is available upon request

 

 

Applications:

1.    Shaped and unshaped refractory

Tabular alumina can be used as the main component in aluminum-carbon, aluminum-magnesium-carbon, magnesia-aluminum-carbon, magnesia spinel, aluminum-chromium refractory bricks, or as a component of unshaped refractory products.

2.    Sliding nozzle for steel industry

with good thermal shock stability and wear resistance which are required for refractory materials for sliding nozzles, the sintered tabular alumina can precisely meet all the demands as sliding nozzle. The aluminum-carbon sliding nozzle made from sintered tabular alumina mixing with graphite (or carbon black) and antioxidant, or aluminum-zirconium-carbon sliding nozzle made from sintered tabular alumina mixing with appropriate amount of zirconia, graphite (or carbon black) and antioxidant are very popular in steel making industry.

3.    Ladle castables (Kiln furniture)

with the continuous development of refining technology outside the furnace, the use environment of refractory materials in ladle is becoming more and more demanding. the molten steel needs to stay longer in the ladle for stirring, heating, and erosion of different steel slags. the single material (such as magnesium or aluminum) of the ladle lining has been replaced by composite materials. the aluminum-magnesium spinel castables made from sintered tabular corundum and spinel is more used for the bottom or wall of the cladding as linings.

4.    Refractory prefabrication

Raw materials for breathable bricks, seat bricks, spray guns, impact plates, etc. those prefabrications produce by tabular alumina are not only part of the refractory lining of the ladle, but also play a very important role in the steelmaking process itself. Adopting tabular alumina will increase wear resistance and corrosion resistance of those products.

Applications:

5.    Shaped and unshaped refractory

Tabular alumina can be used as the main component in aluminum-carbon, aluminum-magnesium-carbon, magnesia-aluminum-carbon, magnesia spinel, aluminum-chromium refractory bricks, or as a component of unshaped refractory products.

6.    Sliding gate plate & sliding nozzle

with good thermal shock stability and wear resistance which are required for refractory materials for sliding, the sintered tabular alumina can precisely meet all the demands as sliding nozzle. The aluminum-carbon sliding nozzle made from sintered tabular alumina mixing with graphite (or carbon black) and antioxidant, or aluminum-zirconium-carbon sliding nozzle made from sintered tabular alumina mixing with appropriate amount of zirconia, graphite (or carbon black) and antioxidant are very popular in steel making industry.

7.    Ladle castables (Kiln furniture)

with the continuous development of refining technology outside the furnace, the use environment of refractory materials in ladle is becoming more and more demanding. the molten steel needs to stay longer in the ladle for stirring, heating, and erosion of different steel slags. the aluminum-magnesium spinel castables made from sintered tabular corundum and AluMagCarbon bricks are used for the bottom lining and walls of steel ladle.

8.    Refractory prefabrication

Raw materials for breathable bricks, seat bricks, spray guns, impact plates, etc. those prefabrications produce by tabular alumina are not only part of the refractory lining of the ladle, but also play a very important role in the steelmaking process itself. Adopting tabular alumina will increase wear resistance and corrosion resistance of those products.

9.    Tabular alumina ball as heat storage ball.

10. Glue and filler

Tabular Alumina fine powder work as additives to Electronic potting glue and other thermal conductive glue & adhesive.

 

Production Process of tabular alumina

 

Package of tabular alumina

 

FAQ:

Q: Are you a manufacturer or trading company?

A: We are a manufacturer of tabular alumina. We have about 20 years' experience of produce sintered tabular alumina

  

Q: Do you have a MOQ?

A: Generally no limit of MOQ. Even 25kgs (1 bag)is ok for us. but the logistic cost will be higher than normal.

 

Q: What is the lead time of FCL tabular alumina?

A: around 7-10 days after receiving the deposit.

 

Q: Is free sample available?

A: Yes, free samples within 5 kgs are available, customer only have to bear express cost.