Customer in Poland ordered 195 tons silica bricks and 80 tons refractory castable
In December. 195 tons silicon bricks are packed for delivering to customer in Poland. High quality silicon bricks and refractory castable in Topower Refractory.
Silica Brick is acidic refractory materials, which have good ability to erod in acid resistance. The softening temperature of the lotus is as high as 1640 to 1670 ° C. It has been stable for a long time at high temperature.
Mainly used for the carbonization room and the burning room of the coke furnace, the heat storage room of the steelmaking flat furnace and the sediment room, the refractory material of the average heat furnace, the glass fusion kiln, and the furnace of the kiln and other kiln of ceramics Lorage parts. It is also used for high temperature load -bearing parts and acid flat furnace top of the hot air furnace.
The acid refractory materials consisting of Setrics, Fang quartz, and a small amount of residual quartz and glass. Silicon dioxide content is more than 94%. Real density 2.35g/cm3. It has anti -acid slag erosion performance. High temperature intensity. The softening temperature starts temperature of 1620 ~ 1670 ° C. Used at high temperature for a long time without deformation. Low thermal shock stability (water heat is exchanged for 1 to 4 times) with natural silica as raw materials, plus an appropriate amount of mineralizer to promote the transformation of the quartz in the blank body into a lizard. In the restore atmosphere, it was slowly burned through 1350 ~ 1430 ° C. When heating to 1450 ° C, there is about 1.5 ~ 2.2%of the overall accumulation of swelling. This residual expansion will make the seam tightly and ensure that the masonry has good gas tightness and structural strength. Symbolics, square quartz, and residual quartz are changing due to crystal type at low temperature, and the volume has changed greatly, so the thermal stability of silica brick at low temperature is poor. During use, slowly heated and cool below 800 ° C to avoid cracks. Therefore, it is not advisable to use a rapidly changing kiln below 800 ° C.
The nature and process of silica brick are closely related to the transformation of SIO2. Therefore, the proportion is an important quality indicator of silica brick. Generally, below 2.38, high -quality silicon bricks should be below 2.35. The true proportion is small, reflecting the large number of squamous quartz and square quartz in the bricks, the remaining quantity of the residual quartz, so the residual lines are less inflated, and the intensity decreases less during use. There are seven crystalline variants and an amorphous variant of the silicon dioxide. These variants can be divided into two categories: the first type of variants are quartz, squamous quartz, and square quartz. Their crystal structure is extremely different, and the transformation of each other is very slow. ─ αβ and γ types, their structures are similar, and they transform faster.
The raw material for making silica brick is silica. The higher the SIO2 content of silicon raw materials, the higher the fire resistance. The most harmful impurities are Al2O3, K2O, NA2O, etc., which seriously reduce the refractory resistance of refractory products.
