Silica brick is to show SiO2 content is in the goods of 93% above. Silica brick is with SiO2 content is not less than the silica of 96% to be raw material, add mineralizer and bond, via mixing refine, shape, dry, firing wait for working procedure to be made. The SiO2 content in silica raw material is higher, of goods fireproof degree taller. Silica brick breed is more, according to utility cent is: Jiao Lu uses kiln of silica brick, glass to wait with silica brick with silica brick, electric stove with silica brick, hot-blast stove. According to transition cent is: Mark brick, general brick, different brick and special model the brick.
Silica brick character:
Silica brick belongs to acidity and fireproof material, have the capacity that stronger counteractive acid slag or acidity solution erode, loading bate temperature is higher the exceedingly good character that is silica brick, it is 1640-1680 ℃ commonly.
Silica brick utility:
The high temperature of kiln of pool of firebox and the char room that silica brick basically uses at build by laying bricks or stones to build Jiao Lu, partition, glass and kiln top, Chi Qiang, hot-blast stove bearings the high temperature of kiln of pool of place, glass, Chi Qiang, hot-blast stove bearings the heat such as furnace of roast of element of place, charcoal.
Silica brick is with 2 oxidation silicon is bases, its content is in the refractory products of 93% above, it is raw material with quartzite, join a few mineralizer, firing below high temperature. Its are mineral those who comprise a few the quartz that it is scale, Fang Shiying, remaining quartz and high temperature to form is glassy the answer appearance organization that waits for coexistence.
Silica brick belongs to acidity and fireproof material, erode resistance to acidity slag strong, but suffer basic slag to be eroded strongly, be contained easily Al2O3, K2O, Na2O wait for oxide action and destroy, to CaO, FeO, the oxide such as Fe2O3 has good repellency.
Loading is out of shape temperature is higher the exceedingly good character that is silica brick, the melting point that approachs scale quartz, square quartz (1670 ℃ , 1713 ℃ ) is wave motion in 1640? Between 1680 ℃ , silica brick is passed again when calcination because remaining continues at the quartz in the brick,change can produce not reversible bulk to expand. Come in 300 ℃ above approach melting point (scale quartz or Fang Shiying) volume of silica brick of this one interval is steady, is there 1.5% about when 1450 ℃ heating when using? The total volume of 2.2% expands, this kind expands can make build by laying bricks or stones is seamed join closely, make sure build by laying bricks or stones builds body to have good air-tightness and structural strength.
Is the biggest drawback of silica brick thermal shock stability low (hot exchange is about in water 1? 4) , be fireproof next degree not tall (be in commonly 1690? 1730 ℃ ) , this makes its applied limits to get very big confine.
Silica brick basically is used at furnace of kiln of frit of Jiao Lu, glass, acidity steel-making and other heat labor facilities.
Should notice when use silica brick the following at 2 o'clock:
1, does silicon pledge goods is in 200? 300 ℃ and when 573 ℃ , as a result of brilliant change, bulk expands abruptly, warm up below in 600 ℃ when reason drying-out should not be too fast, in cold to acuteness temperature change should avoid when 600 ℃ are the following.
2, should not contact with alkalescent slag as far as possible.
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