Glass kilns use different refractory bricks depending on the location. If the refractory is not selected properly, the glass defects caused by refractory bricks may be as follows:
1. Stones
When larger particles of refractory bricks fall into the glass melt and cannot be completely dissolved by the melt, "stones" will appear in the glass. Particles with higher specific gravity will settle to the bottom of the pool. Insoluble substances such as ZrO2 can also be dispersed into very small particles without causing harm.
The alkali in the glass will react with refractory bricks containing alumina to form feldspar substances. Due to the difference in thermal expansion, thin flakes fall off. After falling off, new flakes are generated to cause harm. Those unsintered particles in the ramming material may also enter the glass and form stones.
2. Bubbles
All organic impurities attached to the surface of refractory bricks will be burned to produce bubbles. Some inorganic building materials also tend to produce bubbles at the beginning. In addition, the air discharged from the holes of refractory bricks can also cause bubbles. Carbon impurities are always the source of bubbles
Metallic iron itself has no tendency to produce bubbles, but the carbon contained in it has this tendency. Substances with redox potential will also produce bubbles due to changes in oxidation conditions in the melt. Zircon bricks also tend to produce bubbles in the early stage of use. However, the quality is improved by the action of alkali in the glass, and bubbles no longer occur.
3. Indirect defects
The alkali in the glass combines with the material containing AI203 to form a long stone-like substance. In a certain temperature range, this substance cannot be completely dissolved and leaves "stones". The effect with AZS bricks is similar. Alumina may dissolve or semi-dissolve, and the remaining ZrO2 becomes "stones". The corrosive components of the glass may dissolve the SiO2 in the zircon products and leave ZrO2 stones. If the particles are large enough, stones will appear in the glass. The above particles will also be produced on the eroded checker bricks. When the combustion air passes through the checker brick masonry, it may blow them (parts of the checker bricks, the damaged refractory bricks or their components) into the melt and cause the formation of "stones". Refractory bricks falling from the upper structure or ceiling of the kiln may also form stones.
Refractory bricks for glass kilns are often divided into the following types
1. Rectangular bricks, standard refractory bricks, ordinary wall bricks:
2. Plug bricks. Small thin plates;
3. Large standard refractory bricks, rectangular bricks;
4. Thin plates;
5. Arch bricks: full-wall bricks, double-layer full-wall bricks, combined full-wall bricks, flat-wall bricks, horizontal indigo bricks, steamed bun bricks, semi-circular bricks,
6. Arch foot bricks: pointed wedge bricks, pillars. Corner bricks;
7. Melting pool bricks: integral pool wall bricks. Arc bricks.
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