How to distinguish between good quality and bad quality when buying high alumina bricks?

How to distinguish the quality of high alumina bricks when buying high alumina bricks? On the one hand, it can be observed with the naked eye, on the other hand, it can also be detected and distinguished.

The two main points observed by naked eyes:

A. Appearance impurities

Looking at the content of impurities on the surface of refractory bricks, we often see some black spots on the surface of high alumina bricks. These are the impurities in the raw materials. Theoretically, the fewer impurities, the better, because these impurities are mostly iron oxides. , It is simply reduced to molten iron flowing out in the high temperature environment of the furnace, forming damage to the refractory brick structure, and then affecting the service life of the refractory brick. As an industrial product, the quality of refractory bricks directly affects the production and production costs of the enterprise. Inferior refractory bricks will not only cause various repair strikes in production, increase production costs, but also increase construction and production. More hidden dangers that cannot be guessed.

B. Appearance color and surface lubricity

Seeing a refractory brick, we need to see the appearance color and lubricity of the brick. The quality of some refractory bricks is not very good, and the surface lubricity is very poor, which leads to the strength of the refractory bricks. The uniformity of the appearance and color of the refractory brick shows whether the materials are evenly mixed during the production of the refractory brick. The uneven distribution of materials will lead to uneven distribution of the strength of the refractory bricks, and then reduce the overall strength and service life of the refractory bricks.

The three main points distinguished by detection:

A. Slag resistance

High alumina brick contains more Al2O3, which is a neutral refractory material and can be used in alkaline or acidic environment. Because it contains silica silicon SIO2, the slag resistance in alkaline environment is better than that in acidic environment.

B. Load softening temperature

Because high-alumina products have high Al2O3, less impurities, and less fusible glass, the load softening temperature is higher than that of clay bricks, but because mullite crystals do not form a network structure, the use temperature is not as good as that of siliceous refractories. .

C. Refractoriness

The refractoriness of high alumina bricks is higher than that of clay bricks, reaching 1750 degrees Celsius to 1790 degrees Celsius, which is a high-quality refractory material.

The above is the way to distinguish the quality of high alumina bricks, I hope it will be helpful to you.