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Combination bricks for calcium carbide furnace door
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Product Description
Product Overview:
High alumina bricks are products made by calcining high alumina bauxite clinker and binder, first going through granulation and powder making processes, mixing them in a certain proportion, pressing them into shape, and firing them at high temperatures. According to physical and chemical indicators, it is divided into five grades: LZ-80, LZ-75, LZ-65, LZ-55, and LZ-48. Mainly used in high-temperature parts of industrial kilns.
Physical and chemical indicators:
| Item | Indexes | ||||
| LZ-80 | LZ-75 | LZ-65 | LZ-55 | LZ-48 | |
| Al2O3 % ≥ | 80 | 75 | 65 | 55 | 48 |
| Apparent porosity % ≤ | 21 | 24 | 24 | 22 | 22 |
| Ambient compression strength Mpa ≥ | 70 | 60 | 50 | 45 | 40 |
| 0.2MPa load softening starting temperature ℃ ≥ | 1530 | 1520 | 1500 | 1450 | 1420 |
| Changes in heating permanent line % | 1500℃×2h -0.4～+0.2 | 1450℃×2h -0.4～+0.1 | |||