High-purity corundum bricks are widely used as slag oil and gas furnaces, coal gasifiers, carbon black reactors, pulp waste liquids due to their excellent corrosion resistance, wear resistance and high temperature strength, load softening temperature, creep and other thermodynamic properties. Lining materials for gasifiers and other industrial furnaces.

 

 

In the process of producing high-purity corundum bricks, fused white corundum and slab corundum are the main raw materials. The impurities (such as SiO2) have low content, high bulk density and good thermodynamic properties, which makes corundum bricks resistant to gasifiers. Thermal, chemical and structural damage caused during operation of other industrial furnaces. So which of these two corundum raw materials are suitable for the production of high-purity corundum bricks?

 

 

Firstly, the production process of fused white corundum and slab corundum is different, and the performance is also different, which makes the performance and use of corundum bricks have certain differences. Plate-shaped corundum has been widely used in the production of high-performance refractory materials for steelmaking, such as sliding nozzles, Al2O3-MgO-C bricks, castables and prefabricated parts. For a long time, the raw materials used in high-purity corundum bricks used in non-steel industries, such as gasifiers and other industrial furnaces, are mainly fused white corundum. It is generally believed that the fused white corundum has a high bulk density, can increase the density of the product, and has good corrosion resistance, and can improve the comprehensive performance of the product.

 

 

Electrofusion white corundum

 

Secondly, from the aspect of volume density, the volume density of fused white corundum is slightly lower than that of platy corundum, and the open porosity is obviously high, reaching 8.8%. The plate-shaped corundum has a low porosity of only 2.9%, and there are no obvious open pores, but most of them are closed pores or intercrystalline pores, and the size is usually less than 10 μm, and is uniformly dispersed inside the particles.

 

 

 

Furthermore, considering the firing shrinkage of the slab corundum brick, it can be considered that the better thermodynamic activity of the slab corundum is advantageous for the densification of the slab, so that the aggregate is completely made of the slab corundum brick at a relatively low temperature. Complete sintering can be achieved, which is beneficial for cost savings.

 

Plate corundum

 

The platy corundum can not only improve the corrosion resistance, but also improve the penetration resistance. The low porosity of the slab-like corundum bricks, the higher bulk density and good ceramic bonding are the reasons for better penetration resistance.

 

 

The slab corundum brick can improve the performance of corundum bricks, especially the comprehensive performance, summarized as follows:

 

1. Corundum brick with plate-like corundum has good sintering activity and can improve the density of corundum brick;

 

2. The corundum brick with plate-like corundum has high bulk density and low porosity;

 

3. Pure corundum-like corundum corundum brick has high normal temperature compressive strength, normal temperature flexural strength and high temperature flexural strength;

 

4. The wear resistance of the slab corundum brick is good;

 

5. Corrosion and permeability of anti-coal gasifier slag and residue slag with corundum-like corundum is better than pure fused white corundum brick;

 

6. Composite use of plate-shaped corundum and fused white corundum as aggregate can improve the thermal shock stability of corundum bricks;

 

7. The creep resistance of pure slab corundum bricks and pure fused white corundum bricks is better than that of corundum bricks with two composite aggregates.

 

 

In summary, sunrise Refractory Co., Ltd. believes that corundum bricks with slab corundum as aggregate are superior to corundum bricks with fused white corundum as aggregate, and it is important to use slab-shaped corundum bricks. The performance is good.