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High-alumina bricks for blast furnaces are made of high-grade bauxite as the main raw material, which are batched, pressed, dried and fired at high temperature. They are refractory products used for lining blast furnaces.

1. Physical and chemical indicators of high alumina bricks

INDEX	SK-35	SK-36	SK-37	SK-38	SK-39	SK-40
Refractoriness(℃) ≥	1770	1790	1820	1850	1880	1920
Bulk Density(g/cm3) ≥	2.25	2.30	2.35	2.40	2.45	2.55
Apparent Porosity(%) ≤	23	23	22	22	21	20
Cold Crushing Strength(MPa) ≥	40	45	50	55	60	70
Permanent Linear Change@1400°×2h(%)	±0.3	±0.3	±0.3	±0.3	±0.2	±0.2
Refractoriness Under Load @ 0.2MPa(℃) ≥	1420	1450	1480	1520	1550	1600
Al2O3(%) ≥	48	55	62	70	75	80
Fe2O3(%) ≤	2.0	2.0	2.0	2.0	2.0	1.8

2. Where are the high alumina bricks used in blast furnaces?

High-aluminum bricks are built on the furnace shaft of the blast furnace. The furnace shaft is located in the upper part of the blast furnace. Its diameter gradually expands from top to bottom to adapt to the thermal expansion of the charge and reduce the friction of the furnace wall on the charge. The furnace body occupies the blast furnace. 50%-60% of the effective height. In this environment, the furnace lining needs to meet such requirements, and the characteristics of high alumina bricks are high refractoriness, high softening temperature under load, acid resistance, alkali resistance, strong resistance to slag erosion, and good wear resistance. It can be satisfied, so it is very suitable for the blast furnace body to be lined with high alumina bricks.

The above is an introduction to high alumina bricks for blast furnaces. The lining environment of the blast furnace is complex and there are many types of refractory materials used. High alumina bricks are one of them. There are 3-5 specifications of high alumina bricks used. Robert's high alumina bricks can be used in a variety of kilns. If necessary, please contact us.