Tabular alumina

Tabular alumina is pur α-alumina resulting from intensive sintering at temperatures exceeding 1,800 °C, without sintering additives. Low temperature expansion and high heat resistance can be explained by the microstructure specifics: low effective porosity and large sizes of crystals with closed spherical pores resulting from intensive sintering.

Tabular alumina has exceptionally high refractory properties, mechanical strength, wear resistance, chemical purity, dielectric properties, and excellent corrosive resistance in acid and alkaline environments.

The tabular alumina manufacturing process implies performance of the quality assurance and control at each production stage. This is necessary for the production of superior-quality products. From feeding raw materials to sintering in a shaft furnace at the temperature above 1,800°C, the production process monitoring and control is provided by the skilled personnel and the automated machinery system.

Sintered tabular alumina spinel granules are subject to crushing and classification. Efficient roll crushers and vibratory screens are used for this purpose. To reduce the amount of magnetic iron to standard permissible levels (0.025%), all tabular alumina grading fractions undergo magnetic separation.

The fine grinding area has been purchased and is continuously used for the production of tabular alumina fine fractions. This area includes a highly-efficient ball mill with a separator. All surfaces of the mill and material ducts are lined with wear-resistant ceramics to reduce the amount of magnetic iron in the finished products.

Tabular alumina manufactured by Keralit OOO is used as a filling agent in critical refractory concretes. This ensures superior qualities of concretes and products made from them in most rigid and abnormal operating conditions.

Commodity nomenclature and properties of the material presented in the table below.
To purchase tabular alumina, please contact the Sales Department.

Tabular alumina CERALIT TA 99

Parameters	Units of meas.	MAX	Typical value	MIN	Test method
Chemical composition
Mass fraction Al₂O₃	%	-	99,5	99,3	GOST 2642.4-97
Mass fraction SiO₂	%	0,09	0,07	-	GOST 2642.3-97
Mass fraction Na₂O	%	0,4	0,3	-	GOST 2642.11-97
Mass fraction Fe_magnetic	%	0,025	0,015	-	Domestic technique
Physical properties
Apparent density	g/cm³	-	3,52	3,50	GOST 18847-84
Open porosity	%	5,0	3,7	-	GOST 18847-84
Absorption of water	%	1,5	1,0	-	GOST 18847-84

Brand	Fraction	Grain-size composition of fractions
		Content,%
CERALIT TA 99	0 - 0,020 mm	D90, mkm, less than
		20
CERALIT TA 99	0 - 0,030 mm	D90, mkm, less than
		30
CERALIT TA 99	0 - 0,045 mm	D90, mkm, less than
		45
CERALIT TA 99	0 - 0,250 mm	0-0,25 mm		> 0,25 mm
		90-100%		0-10%
CERALIT TA 99	0,25 - 0,5 mm	< 0,25 mm	0,25-0,5 mm	> 0,5 mm
		0-10%	80-100%	0-10%
CERALIT TA 99	0,50 - 1,0 mm	< 0,5 mm	0,5-1 mm	> 1 mm
		0-10%	80-100%	0-10%
CERALIT TA 99	0,0 - 1,0 mm	0-1,0 mm		> 1,0 mm
		90-100%		0-10%
CERALIT TA 99	1,0 - 3,0 mm	< 1,0 mm	1,0-3,2 mm	> 3,2 mm
		0-10%	90-100%	0-10%
CERALIT TA 99	3,0 - 6,0 mm	< 3 mm	3 - 6 mm	> 6 mm
		0-15%	75-100%	0-10%
CERALIT TA 99	6,0 - 10,0 mm	< 6 mm	6 - 10 mm	> 10 mm
		0-15%	70-100%	0-15%
CERALIT TA 99	6,0 - 15,0 mm	< 6 mm	6 - 15 mm	> 15 mm
		0-10%	80-100%	0-10%
CERALIT TA 99	17,0 - 21,0 mm	The average diameter of the granules, mm
		19 ±2

Packaging: "big-bag" for 1 000 - 2 000 kg