Factors affecting the appearance and color of fused cast refractory bricks

September 27, 2018

Factors affecting the appearance and color of fused cast refractory bricks

Many people are used to look at the color when they buy refractory bricks. However, the appearance and color of refractory bricks does not represent and determine the quality or composition value of the brick.

For example, there are many factors affecting the appearance and color of fused cast refractory brick. Such as oxidizing atmosphere, reducing atmosphere and its conversion during the melting of the batch materials, the solubility of impurities in the glass phase, the redox balance of multivalent ions, the reaction or eutectic between sand mold materials and melt cause the surface of the brick to be colored, which causes the color of the refractory brick to change. Among them, the oxidation degree, residual carbon content and transition element ion valence state of the cast AZS refractory have a significant influence on the appearance and color of the brick.

Factors affecting the appearance and color of fused cast refractory bricks

Color of casting AZS brick

Ionic valence 

Residual carbon content /% 

Degree of oxidation

Light yellow

Fe3+

≤0.008

High

Grayish white

Ti3+

≤0.02~0.03

Higher

Light gray

Ti3+

0.03~0.06

Reduction

Gray

0.08~0.12

Reduction

Dark gray

0.15~0.19

Reduction

Therefore, when we choose refractory bricks, we can not simply judge the quality of bricks by a certain standard, but we should integrate various factors, such as index content, refractoriness under load, bulk density, cold crushing strength and so on.

 

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