Low creep high alumina brick for hot blast stove

Low creep and high alumina bricks are high-grade refractory materials made of alumina, fused corundum, and fused mullite as the main raw materials.

Features

1. Refractoriness

The refractoriness of low-creep and high-alumina bricks is higher than that of clay bricks and semi-silica bricks, reaching 1750~1790℃, which is a high-grade refractory material.

2. Load softening temperature

Because high-alumina products have high Al2O3, less impurities, and less fusible glass bodies, the load softening temperature is higher than that of clay bricks. However, because mullite crystals do not form a network structure, the load softening temperature is still not as high as that of silica bricks.

3. Slag resistance

Low creep and high alumina bricks contain more Al2O3, which is close to neutral refractory materials, and can resist the erosion of acidic slag and alkaline slag. Because it contains SiO2, the ability to resist alkaline slag is weaker than that of acidic slag.

use

Mainly used for lining of blast furnaces, hot blast furnaces, electric furnace tops, blast furnaces, reverberatory furnaces, and rotary kilns.

project		Low creep high alumina brick
project		DRL-155	DRL-150	DRL-145	DRL-140	DRL-135	DRL-130	DRL-127
Al2O3,% ≥		75	75	65	65	65	60	50
Apparent porosity，% ≤		20	21	22	22	22	22	23
Bulk density, g/cm3		2.65-2.85	2.65-2.85	2.50-2.70	2.40-2.60	2.35-2.30	2.30-2.50	2.30-2.50
Compressive strength at room temperature, Mpa ≥		60	60	60	55	55	55	50
Creep rate % （0.2Mpa,50h) ≤		1550℃ 0.8	1500℃ 0.8	1450℃ 0.8	1400℃ 0.8	1350℃ 0.8	1300℃ 0.8	1270℃ 0.8
Change rate of reburning line %	1550℃,2h	0.1－-0.2	0.1－-0.2	0.1－-0.2
Change rate of reburning line %	1450℃,2h				0.1－-0.2	0.1－-0.4	0.1－-0.4	0.1－-0.4