Product Details

Introduction:

High-alumina refractory bricks are made from bauxite or kaolinitic clays. The definition high-alumina refractory bricks contain between 40 and 87.5 percent alumina. They are much harder and tougher than fireclay refractories at high temperatures and in basic environments. In addition, high-alumina refractory bricks exhibit better volume stability and abrasion resistance. High-alumina bricks are used in blast furnaces, blast-furnace stoves, and liquid-steel ladles etc.

The high alumina bricks are basically divided into three grades as per the amount Al2O3 they contain. These are

Grade I which includes Al2O3 for in the range of 75~81%

Grade II which includes Al2O3 for in the range of 60~75%

Grade III which includes Al2O3 for in the range of 48~60%

Top Grade which includes Al2O3 for in the range of 82~89%

Properties of High Alumina Bricks

The high alumina bricks are basically perfect and advanced refractory materials having a very high refractoriness up to 1750~1790, which is much higher than that of fire clay bricks and semi-silica bricks obviously.

The high alumina bricks are very durable in nature and are also well designed to be used in high-temperature area such as blast furnaces.

The high alumina bricks are usually constructed with higher refractoriness and low impurities.

These bricks include more Al₂O₃ content than that of other ones in the same category and hence can also be referred to neutral refractory material having resistance to acid and basic slag erosion.

Along with Al₂O₃ these bricks also comprise of SiO₂ content which enhance the resistance to acid slag erosion much more..

Characteristic as follows:
a, refractoriness; high alumina bricks refractoriness are higher than clay and semi-silica brick refractoriness up to 1750 ~ 1790 ℃, belonging to high-grade refractory.
b, load softening temperature; high aluminum products because of high Al₂O₃, less impurities, less fusible vitreous formed, so load softening temperature is higher than the clay brick, but not formed mullite crystalline , so load softening temperature silica brick is still not high.
c, slag resistance; Al₂O₃ in alumina bricks are more close to neutral refractories, resistant to erosion of acid and alkaline slag slag, because it contains SiO₂, so resistance to alkaline slag ratio of acid slag ability weaker.

Parameters

Chemical Analysis (wt%)		Apparent Porosity (%)	Bulk density (g/cc)Min.	CCS (kg/cm2)	PLC (%)	PCE (℃/OC) Min.	RUL (Ta℃)	Application Area
Al₂O₃	Fe₂O₃	Apparent Porosity (%)	Bulk density (g/cc)Min.	CCS (kg/cm2)	PLC (%)	PCE (℃/OC) Min.	RUL (Ta℃)	Application Area
44-48	1.2-1.5	14-18	2.35	450-700	-0.5 to 0.2 at 1450℃/2h	1743/33	1460-1500	Blast Furnace, Preheating Zone of Cement Rotary Kiln, Lime Kiln & Glass Tank Furnace.
–	–	17-21	2.25	400-600	-1.0 to 0.2 at 1450℃/2h	1683/31	1390-1440	Reheating Furnace Wall.
47-50	2.6-3.5	17-21	2.32	450-650	-0.8 to 0.4 at 1450℃/2h	1717/32	1400-1450	Preheating Zone of Cement Rotary Kiln & Reheating Furnace Wall.
47-50	1.8-2.2	16-21	2.3	450-650	-1.0 to 0.3 at 1450℃/2h	1717/32	1400-1450	Dense brick for Petro-Chemicals, Fertilizer Plants & Anode Baking Furnace.
–	–	16-22	2.35	450-650	-0.5 to 1.0 at 1450℃/2h	1743/33	1430-1480	Reheating Furnace Roof.
52-55	2.9-3.9	17-22	2.42	450-650	-0.5 to 1.0 at 1450℃/2h	1743/33	1400-1440	Preheating Zone of Cement Rotary Kiln & Reheating Furnace Wall.
52-56	1.7-2.2	16-21	2.35	500-700	-0.8 to 0.3 at 1500℃/2h	1763/34	1450-1500	Reheating Furnace Roof & Petro-Chemicals.
56-59	1.0-1.5	17-21	2.35	400-600	±0.7 at 1500℃/2h	1804/36	1500-1540	Glass Tank Furnace & Frit Furnace.
57-60	3.4-4.2	17-22	2.5	550-800	-0.4 to 2.0 at 1450℃/2h	1785/35	1420-1450	Reheating Furnace Wall, Burning Ladle Back up.
57-61	2.8-3.8	17-22	2.45	500-800	-0.2 to 2.2 at 1500℃/2h	1785/35	1430-1470	Reheating Furnace Wall, Burning Zone of Cement Rotary Kiln & Ladle Back up.
58-61	1.7-2.2	16-21	2.45	500-800	-0.4 to 0.8 at 1500℃/2h	1804/36	1470-1510	Sulphur Furnace, Alakli Resistant Bricks for Cement Rotary Kiln & ladle Back up.
59-61	0.9-1.1	14-18	2.45	600-800	±0.5at 1600℃/2h	1820/37	1630-1670	Blast Furnace Stove Checkers, Solid Wall Bricks & Glass Tank Furnace.
61-63	1.2-1.7	14-18	2.45	500-800	±0.8 at 1500℃/2h	1785/35	1500-1530	Blast Furnace Stove Checkers, Solid Wall Bricks & Glass Tank Furnace.
61-64	1.2-1.5	13-16	2.5	600-900	±0.5 at 1500℃/2h	1804/36	1500-1550	Blast Furnace Hearth, Non-Recovery Coke Oven, Glass Tank Furnace & Frit Furnace.
62-64	0.9-1.2	12-15	2.5	650-900	±0.2 at 1500℃/2h	1820/37	1500-1550 at 4kg/cm2	Blast Furnace Hearth, Non-Recovery Coke Oven, Glass Tank Furnace.
64-67	3.5-4.4	17-23	2.55	500-800	0.5 to 2.5 at 1450℃/2h	1804/36	1440-1470	Boiler, Cupola & Steel Foundry
67-70	3.4-4.0	17-22	2.6	600-900	0.3 to 2.5 at 1450℃/2h	1804/36	1460-1480	Boiler, Cupola, Steel Foundry & Reheating Furnace.
67-70	2.8-3.2	17-22	2.6	600-900	0.5 to 3.0 at 1500℃/2h	1804/36	1460-1480	Burning Zone of Cement Rotary Kiln & Steel Ladle.
67-70	2.4-2.8	16-21	2.55	600-800	0.5 to 2.5 at 1500℃/2h	1804/36	1460-1490	Burning Zone of Cement Rotary Kiln & Steel Ladle.
68-71	1.8-2.2	16-21	2.55	600-900	0.2 to 2.0 at 1500℃/2h	1804/36	1470-1500	Burning Zone of Cement Rotary Kiln & Steel Ladle.
68-72	1.4-1.8	16-21	2.55	600-900	-0.2 to 2.0 at 1500℃/2h	1820/37	1500-1530	Burning Zone of Cement Rotary Kiln, Lime Kiln & Steel Ladle.
69-72	0.4-0.8	15-18	2.55	600-900	-0.2 to 0.5 at 1600℃/2h	1820/37	1650-1700	Blast Furnace Hearth & Taphole, Lime Kiln, Glass Tank Furnace & Non-recovery Coke Oven.
71-75	2.8-3.5	17-22	2.65	600-900	0.3 to 3.0 at 1500℃/2h	1804/36	1470-1490	Blast Furnace Hearth, Lime Kiln, Glass Tank Furnace & Non-recovery Coke Oven.
74-77	2.8-3.5	17-22	2.72	700-950	-0.5 to 2.5 at 1550℃/2h	1820/37	1470-1500	EAF Roof, Steel Rolling Mill & Steel Ladle.
77-80	2.2-2.7	17-22	2.72	700-900	-0.5 to 2.5 at 1550℃/2h	1820/37	1490-1520	EAF Roof, Steel Rolling Mill, Steel Ladle & other high heat duty special applications.
78-81	1.5-2.0	15-19	2.75	750-1000	0.5 to 1.2 at 1550℃/2h	1820/37	1520-1550	EAF Roof, Steel Rolling Mill, Steel Ladle & other high heat duty special applications.
78-81	1.5-2.0	14-18	2.8	800-1100	0.5 to 1.2 at 1550℃/2h	1820/37	1520-1550	Phosphate-bonded bricks for Reheating Furnace Bottom & other high Abrasion Resistant applications.
82-85	1.4-1.8	15-19	2.8	750-1000	-0.3 to 1.0 at 1550℃/2h	1850/38	1540-1580	Special high temperature, high abrasion & spalling resistant applications like Torpedo Ladle etc.
82-85	1.4-1.8	13-17	2.85	850-1200	-0.3 to 1.0 at 1550℃/2h	1850/38	1540-1580	Non-wetting Phosphate-bonded bricks for Aluminium Melting & Holding Furnace, Reheating Furnace Bottom etc.
86-89	1.0-1.8	44911	2.9	900-1200	-0.2 to 0.5 at 1500℃/2h	1820/37	1580-1620	Reheating Furnace Bottom (specially Coal-fired).

Application of High Alumina Bricks

The high alumina bricks are mainly used in masonry in blast furnace, hot blast furnace, electric furnace roof, blast furnace, reflecting furnace, lining of rotary kiln. In addition, high alumina brick are widely used in open hearth furnace lattice brick, plug used in casting system, nozzle brick, etc. But the price of high alumina brick is higher than the clay brick, so we do not need high alumina brick when the clay brick can satisfy the demand.