High Alumina Bricks

High alumina bricks are made from bauxite or kaolinitic clays. The definition of high alumina bricks contains between 50 and 87.5 percent alumina. They are much harder than fireclay refractories at high temperatures and in basic environments.

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Introduction of High Alumina Bricks

High alumina bricks are made from bauxite or kaolinitic clays. The definition of high alumina bricks contains between 50 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, liquid-steel ladles, etc.

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

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

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

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

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

Properties of High Alumina Bricks

1. High alumina bricks are advanced refractory materials with very high refractoriness up to 1750-1790°C, much higher than fire clay and semi-silica bricks.

2. High alumina bricks are very durable. They are also well-designed for use in high-temperature areas like blast furnaces.

3. High alumina bricks usually have higher refractoriness and lower impurities.

4. These bricks have a higher Al₂O₃ content than other bricks in the same category. Therefore, they are also called neutral refractory materials resistant to both acidic and basic slag erosion.

5. Break up the fifth sentence: "Along with Al₂O₃, these bricks also contain SiO₂, which enhances their resistance to acidic slag erosion even more.

Application of High Alumina Bricks

The high alumina bricks are mainly used in masonry in blast furnaces, hot blast furnaces, electric furnace roofs, blast furnaces, reflecting furnaces, and lining of rotary kilns. In addition, high alumina brick is widely used in open hearth furnace lattice brick, plugs used in casting systems, nozzle brick, etc. However 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.

Characteristic of High Alumina Bricks

Refractoriness

High alumina brick refractoriness is higher than clay and semi-silica brick refractoriness up to 1750 ~ 1790℃, belonging to high-grade refractory.
Load Softening Temperature

high aluminum products because of high Al₂O₃, fewer impurities, and 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.
Slag Resistance

Al₂O₃ in alumina bricks is closer to neutral refractories, and resistant to erosion of acid and alkaline slag, because it contains SiO₂, so the resistance to alkaline slag ratio of acid slag ability is weaker.

Chemical & Physical Index

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 and petrochemicals.
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	Sulfur 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 and 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 (especially Coal-fired).