We constant fireproof spend the fireproof material in 1770~2000 ℃ to make advanced and fireproof material. This kind of fireproof material is had tall fireproof degree, high loading softening point, good bulk stability, thermal stability and the sex that fight broken bits, and particular mechanical strength. Use at building the housing materials of kiln furnace, firebox and part of other high temperature.
Our country shows level to be able to bear fireproof material has the main aspect that high temperature is close to 2000 ℃ brick of dolomite brick, corundum of magnesia brick, founding. Below, let us understand two kinds high temperature resistant material.
1. Dolomite brick
Dolomite brick is the dolomite that passes by to calcine arenaceous the fireproof material product that makes. Contain oxidation calcium normally (CaO) 40% above, magnesian (MgO) 35% above, still contain a few oxidation silicon (SiO2) , alumina (Al2O3) , 3 oxidation 2 iron (Fe2O3) wait for foreign matter.
Dolomite brick can divide by manufacturing technology for: Tar (bitumen) union does not bake bricks, burn oily dip gently brick and firing oily dip brick. Dolomite brick contains free CaO, in air easily to hydrate bursts apart, unfavorable and long-term deposit.
Dolomite brick is had extremely tall fireproof degree, use extensively at alkalescent converter. Lining of converter of current very much industry basically uses our country the dolomite brick that tar combines and the magnesium that tar combines are qualitative dolomite brick, some factories are in fragile place is used burn oil gently dip and firing oily dip magnesium is qualitative dolomite brick. In addition, firing oily dip magnesium pledges dolomite brick still uses as the liner of the finery outside certain furnace.
2. Magnesia brick
Magnesian content is in magnesia brick the 90% above, alkalescent and fireproof material that gives priority to brilliant photograph with square magnesian stone. Can divide commonly combine magnesia brick for agglomeration magnesia brick and chemistry two kinds big.
Agglomeration magnesia brick is raw material with making bricky magnesia brick, via smashing, burden, mix practice, after shaping, in 1550 ～ the high temperature of 1600 ℃ falls firing, high pure of goods firing temperature is in 1750 ℃ above. Irrigating magnesia brick is proper chemical bond is added in magnesia, via mixing refine, shape, dry and make.
Magnesia brick has taller fireproof degree, function of very good broken bits of alkali resistance sex, loading bate begins temperature tall, but heatproof shake performance is poor.
Magnesia brick basically is used at steel-making hearth of alkalescent open-hearth furnace, electric stove and boiler setting, the intermediate line of aerobic converter, nonferrous metal smelting furnace, kiln of high temperature channel, to calcine magnesia brick and liner of cement rotary kiln, the hearth of heating furnace and boiler setting, checker brick of vitreous kiln regenerator.
These two kinds of fireproof material we according to raw material excellent deserve to compare, scientific manufacturing technology, can make their high temperature resistant ability achieves 2000 ℃ left and right sides, it is the advanced and fireproof material of be worthy of the name.
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