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High alumina bricks for rotary kiln

Al₂O₃ (%)≥48～85;　　Fe₂O₃ (%)≥1.8～2.5
Cold crushing strength(MPa):45～70
Refractoriness under load 0.2MPa℃≥1420～1550

Application:

High alumina bricks as rotary kiln refractories are mainly used for linings of burning zone in alumina production process, because of good corrosion and erosion resistance.

　　High alumina bricks are extremely common refractory materials, of which main components are Al₂O₃. In china, according to the the content of Al₂O₃, high alumina bricks are graded from 'Ⅰ' down to 'Ⅲ' .

　　Ⅰ. More than 75%

　　Ⅱ. 60%～75%

　　Ⅲ. 48%～60%

　　High alumina bricks what the content of Al₂O₃ is more than 90%, are sometimes called corundum bricks.

　　High alumina bricks are produced with selected bauxite chamotte as main raw materials, fired at 1420-1600 °C by advanced process with strict quality control.

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Index		LZ-48	LZ-55	LZ-65	LZ-70	LZ-75	LZ-80	LZ-85
Al₂O₃ (%)		≥48	≥55	≥65	≥70	≥75	≥80	≥85
Fe₂O₃ (%)		≤2.5	≤2.5	≤2.0	≤2.0	≤2.0	≤2.0	≤1.8
Refractoriness ℃		1760	1760	1770	1770	1770	1790	1790
Bulk density g/cm³		2.30	2.35	2.40	2.40	2.45	2.63	2.75
Apparent porosity (%)		≤23	≤23	≤23	≤23	≤23	≤22	≤22
Refractoriness under load 0.2MPa℃		1420	1470	1500	1510	1520	1530	1550
Cold crushing strength MPa		45	45	50	60	60	65	70
Permanent linear change %	1500℃×2h	+0.1~-0.4	+0.1~-0.4	+0.1~-0.4	+0.1~-0.4	+0.1~-0.4	+0.1~-0.4	+0.1~-0.4

Converter

EAF

Ladle

Secondary refining

Tundish