Refractory for Glass Kiln - Selection of Fused Zirconia Corundum Brick（AZS）

Mar 17,2017
Fused zirconia corundum brick（AZS）, also known as electric melting brick， is generally used in the tank wall of glass furnace kiln, well, how to choose the proper fused zirconia corundum brick for different glass kiln?
Generally, for soda-lime silicate glass, 36 # fused zirconia corundum brick with good corrosion resistance should be used in the uppermost layer at the rear and the middle part of the melting tank. When using electric melting and bubbling, because the brick with electrode and the bubble tube inserting damage seriously due to erosion, and the electrode bricks require good insulation, 41 # fused zirconia corundum brick should be used.
At this point，the bottom of tank wall can not use fused mullite brick, due to the bottom of fused brick will be subject to strong erosion after using of electric melting and bubbling technology.  However, Fused mullite brick can be used in the process of melting Fe2O3, CoO, c coloring glass in absence of electric melting and bubbling technology.
Zhengzhou Dengda glass kiln construction experts Suggested that it can be considered from the following two aspects:
From the horizontal direction, the erosion degree in the front，Central，rear three parts of the glass kiln are not the same.The raw material casting mouth and the middle of the tank are most easy to damage . Followed by the rear wall. The wall near the flow hole fuse damaged less light. However, for the double chamber furnace, there is a section of “8-shaped”wall in melting tank near the flow hole, the brick there is also very easy to damage.
From the vertical direction of up and down, due to high temperature, strong liquid flow, intense chemical reaction of the upper glass liquid , thus the fused brick in the upper part of the wall erode seriously. In particular, in the gas, liquid, solid three-phase junction near the liquid level line,  the erosion of nitrate and material powder often erode the brick, it is one of the most eroded parts.
For other types of glass kiln, such as K2O, Li2O, MgO, BaO, PbO, A12O3, B2O3, F and other glass kiln, it can be selected fused brick according to the above method in addition to individual circumstances. This individual case refers to high-silica low-alkali or alkali-free glass. For melting glass furnace, the domestic tank wall welded brick mainly use quartz brick and white stone brick. There are also foreign use of dense zircon brick and 36 # fused zirconia corundum brick in pairs. Dense zircon brick has better corrosion resistance than 36 # fused zirconia corundum brick.