1. The physical and chemical indicators, allowable deviation in size, and surface cracking of ordinary refractory clay bricks should comply with the specifications.
Ordinary refractory clay bricks are used for refractory masonry of general furnaces and kilns. The operating temperature of lining materials, furnace walls, furnace bottoms, and flues is below 1250 ℃. The combustion chamber is allowed to use temperatures above 1400 ℃.
2. The physical and chemical indicators, product dimensions, and allowable deviations of high alumina bricks should comply with the specifications. High alumina bricks are used in areas with high temperature resistance and wear resistance in general furnaces, as well as in masonry with high loads, burner bricks, and special requirements. The dome of the high-temperature area of the combustion chamber allows for temperatures ranging from 1300 to 1650 ℃.
3. The physical and chemical indicators, allowable deviation in product size, and cross-sectional requirements of lightweight clay bricks should comply with the specifications. Lightweight refractory clay bricks are used as furnace linings that are not affected by high-temperature slag and corrosive gases. Depending on their capacity, they can be used at temperatures between 1150 and 1400 ℃.
4. The physical and chemical indicators and allowable deviation of external dimensions of lightweight high alumina bricks should comply with the specifications. Used for heat-resistant linings with working temperatures below 1350 ℃, as well as masonry without high-temperature molten material erosion and erosion, which can come into direct contact with flames.
5. Generally, corundum bricks are suitable for lining the fire-facing surface of heavy oil gasifiers with working pressure below 3MPa, important parts of the lining of saline wastewater incinerators, and radiating burner bricks that work at high temperatures. The general usage temperature of corundum bricks is below 1600~1670 ℃.
6. Low silicon fused corundum is suitable for occasions with strong reducing atmospheres, high hydrogen pressure, and the presence of high-temperature water vapor. For example, in large-scale synthetic ammonia plants, the gas collection pipe lining of the first stage conversion furnace, the lining bricks of the second stage conversion furnace, and the high-temperature furnace lining. The physical and chemical indicators and allowable size deviations of low silicon fused corundum bricks should comply with the specifications. The operating temperature of low silicon fused corundum is below 1600 ℃ to 1670 ℃.
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