After summarizing the causes and mechanism of damage of blast furnace ceramic cup masonry, on the basis of plastic combination of composite brown corundum brick and corundum brick and French brown corundum pouring block, microporous corundum brick, a new product of blast furnace ceramic cup masonry, is developed and produced by adding special additives and special binders and adopting new processes.
Compared with composite brown corundum brick and French brown corundum pouring block products, microporous corundum brick has high temperature strength, good toughness, alkali metal resistance, slag resistance and hot metal corrosion resistance. At the same time, the average pore diameter of the product is small,the percentage of pore volume less than 1um is high, greater than or equal to 70%, which is almost airtight brick.
The remarkable indexes of microporous corundum brick are as follows:
Al2O3 % | Fe2O3 % | Apparent porosity % | Molten iron corrosion index % | Slag resistance % | Decrease rate of alkali resistance % | Average aperture um | Less than 1um pore volume ratio % |
≥80 | ≤1.0 | ≤15 | ≤1.5 | ≤10 | ≤10 | ≤0.5 | ≥70 |
