Selection of refractory bricks for the clarification section of a glass kiln

The clarification section of a glass kiln has a much lower temperature than the melting section. Therefore, the erosion rate of refractory bricks in this section is also much lower, so the selection of refractory bricks is more flexible

(1) Flow hole

The erosion of the flow hole on the clarification side is smaller than that on the melting side, because the glass has lost some heat here, but the refractory materials selected for this part should still have good erosion resistance, especially the cover bricks and veneer bricks

(2) Bridge wall and side wall

The refractory materials used in these two parts are eroded at a lower temperature than the refractory bricks used in the melting section, but are still eroded by the glass liquid surface and become the largest erosion points. The refractory materials used range from fused clay bricks to fused cast zirconium alumina silicate bricks. Fusion cast α and B-corundum bricks are widely used. Some tank kilns for melting borosilicate glass use medium-density zirconium bricks, and many fiberglass melting furnaces use a combination of dense sintered chrome bricks, fused AZS bricks and dense zirconium bricks.

(3) Feed channel inlet

The feed channel inlet is usually raised above the bottom of the clarifier. This is the starting point of the flow channel connected to the forming machine. If the joints between the upper and lower brick layers here are not very tight, it is particularly susceptible to the upward drilling of its bottom surface. For this reason, most refractory materials are best diamond-ground to obtain tight joints so that they can achieve the longest service life. The refractory materials used here are almost all molten cast types.

(4) Pool bottom

The environment here is basically the same as the part in contact with the glass in the melting section. The bottom of this part is also more sensitive to defects caused by refractory materials than the melting section. Some melting furnaces still use integral clay brick structure in this part; however, most melting furnaces are paved. The refractory materials used in practice include sintered zirconium bricks, sintered AZS bricks, fused corundum bricks and fused AZS refractories.