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Furnace Refractory Brick alumina Silica Brick Refractory Bricks For Coke Oven
Silica brick is the acid refractory ,which consist mainly of tridymite, cristobalite, and a small amount of residual quartz and glass phases.
The silica content is 94% or more. It has acid slag corrosion resistance and higher high temperature strength. The load softening start temperature is 1620~1670 °C. Long-term use at high temperatures does not deform. The thermal shock stability is low (heat exchange in water for 1~4 times). This residual expansion will make the joints tight and ensure good air tightness and structural strength of the masonry.
Silica brick is made of quartz stone material, the content of SiO2 is above 93%,it has good resistance to acid slag and good heat conductivity. And the refractoriness is 1690~1710°C,RUL is beyond 1620°C.
SiO2 has different types of crystals in different temperatures, and
the transform between the crystals will cause the change of the
bulk. So there is a close contact between the changes of SiO2
crystals and the produce ,performance and usage of silica bricks.
During the heating, there will be changes of the bulk ,and
cristobalite changes most, then quartz, phosphorus quartz is the
slowest of all and it also has good heat-conductivity.Coke oven
should use the silica brick with small true density. And the
phosphorus quartz is better than others.
The bricks are packed on wooden pallet with papers in each layer and PP film wrapped outside of the whole pallet.