This issue we will continue to introduce the principle of mutual balance of high alumina refractory bricks.
In high-alumina refractory bricks, increasing the content of Al2O3 will increase the resistance of the product to acidic slag. This is because when the amount of Al2O3 in high alumina refractory bricks increases, the content of liquid phase decreases, the amount of mullite increases (Al2O3, when the content is above 72%), and the amount of corundum phase also increases (Al2O3 content greater than 72%). For pure corundum products (98-99% Al2O3), it has the greatest slag resistance. This is because corundum is more inert than mullite. However, the resistance of high alumina refractories to alkaline slag is not as good as that of alkaline refractories such as magnesia bricks, magnesia chrome bricks, magnesia spinel bricks, and dolomite bricks. This is related to the acidic nature of Al2O3.
