The application of bauxite in blast furnace is mainly reflected in the following aspects:

I. Blast furnace lining materials

Bauxite is one of the main raw materials for manufacturing refractory bricks for blast furnace lining. Blast furnace high alumina brick is made of high alumina clinker as the main raw material, and its Al₂O₃ content is usually more than 48%. This refractory brick has the following characteristics:

High fire resistance: the fire resistance temperature is usually above 1500°C, which can meet the high temperature demand of blast furnace.

Good corrosion resistance: it can resist the corrosion of high temperature slag and gas in the furnace.

Thermal shock resistance: During charging and discharging of blast furnace, the temperature changes greatly, and bauxite refractory bricks can withstand this temperature change without cracks.

High mechanical strength: able to withstand the strong pressure inside the blast furnace.

II. Repair of blast furnace taphole

High alumina castable is often used to repair the taphole of blast furnace. This castable is made of bauxite and other materials, which has excellent high temperature performance and corrosion resistance, high strength after construction, high temperature resistance and slag resistance.

III. Slag treatment

Bauxite can effectively combine slag, promote its fluidity and separability, and make the tapping and slag tapping process of blast furnace smoother.

IV. Application of hot blast stove

Bauxite is also used to make high alumina bricks for hot blast stoves. The Al₂O₃ content of this brick is not less than 48%, and it has good fire resistance and corrosion resistance, which can effectively improve the service life of the hot blast stove.

V. Economy

Although the initial investment of bauxite is high, its durability and long service life can effectively reduce the maintenance and replacement cost of blast furnace.

To sum up, bauxite has been widely used in blast furnace lining, taphole repair and slag treatment because of its excellent high temperature resistance, corrosion resistance and thermal shock resistance, and it is an indispensable refractory for modern blast furnaces.