Chromic corundum

Chrome corundum:
The main mineral composition is α-Al2O3-Cr2O3 solid solution.
The secondary mineral composition is a small amount of compound spinel (or no compound spinel), and the content of chromium oxide is 1% ~ 30%.
There are two kinds of fused cast chrome corundum brick and sintered chrome corundum brick.
In general, chrome corundum brick refers to sintered chrome corundum brick. Using α-Al2O3 as raw material, adding appropriate amount of chromic oxide powder and chromic corundum clinker powder, forming, burning at high temperature. The chromium oxide content of sintered chrome rigid brick is generally lower than that of fused cast chrome corundum brick. It can also be prepared by mud casting method. The α-Al2O3 powder and chromium oxide powder are evenly mixed, and the degumming agent and organic binder are added to make thick mud. At the same time, some chromium corundum clinker is added, and the brick billet is made by grouting method and then fired. It can be used as the lining of glass kiln, the cover brick of drawn glass flow hole and the backing of hot metal pretreatment device, waste incinerator, coal water slurry pressure gasifier, etc.