In principle, although the melting furnace can be lined with C2O3AL2O3 bricks, it can also be lined with 2O3-A2O3 refractory castables. However, for furnaces with complicated structures, when considering cost and workability (convenience), Cr2O3-A2O3 refractory castables are often used for lining, especially like thermal decomposition gasification melting furnaces, because the furnace walls are mostly boiler water pipes. It is very difficult to use refractory bricks, but it is very convenient to use Cr2O3A2O3 refractory castables for lining.
When the melting furnace is lined with corundum refractory castables doped with Cr2O3 powder and Al2O3 powder, it is considered that C2O2-Al2O3 refractory castables with high Cr2O3 content in the matrix material. To confirm this, Table 5- The corrosion resistance of the four refractory castables in 6 will also be high.
The corrosion test was performed using a rotary erosion test furnace (1750 ° C. The results confirmed that the corrosion resistance of these refractory castables increased with the increase of the Cr2O3 content in the matrix, because Cr2O3 reacted with A2O3 at high temperatures. (1-x) Cr2O3 · xA2O3 solid solution [ie (Cr1-xA12) 2O3,0.