Clay fire brick SK34 uses clay clinker as aggregate and refractory clay (soft clay or semi-soft clay) as binder to make refractory with Al2O3 content of about 48%. It is a refractory product with a wide range of uses and greater output.
Clay fire brick SK34 properties:
The properties of clay products fluctuate in a wide range, which is due to the differences in the chemical composition and production process of the products. Clay fire brick SK34 generally has the following properties:
1. Chemical and mineral composition. The content of Al2O3 is 30%-48%, the content of SiO2 is 50%-65% and a small amount of alkali metal and alkaline earth metal oxides TiO2, Fe2O3, etc. The mineral composition is generally: mullite, cristobalite and quartz, glass phase.
2. The refractoriness is generally 1580-1750 ℃, which increases with the increase of Al2O3/SiO2. When the content of low-melt impurities is large, the refractoriness of the product decreases significantly.
3. The softening temperature under load is about 1250-1450℃, and its variation range is wide. The initial deformation temperature is relatively low, about 200-250℃ different from the 40% deformation temperature.
4. Low coefficient of linear expansion, the average coefficient of linear expansion at 20-1000℃ is 4.5-6*10-6/℃. Its thermal conductivity is also lower.
5. Good thermal shock resistance and large fluctuation range. 1100 ℃ water cooling cycle is generally more than 10 times. This is related to the low coefficient of linear expansion of clay products, the insignificant effect of crystal transformation and the shaping at high temperature.
6. Resistance to chemical erosion: Because it is weakly acidic, it has strong resistance to acid slag erosion, and weak resistance to alkaline material erosion.
Clay fire brick SK34 usage:
Clay fire brick SK34 is an acidic refractory product, and its acidity increases with the increase of SiO2 content. It has certain corrosion resistance to acid slag, but poor resistance to alkaline slag corrosion, so clay products should be used as the lining of acid kilns. It is also used in high temperature furnaces such as blast furnaces, hot blast furnaces, glass kilns, and carbon roasting furnaces.
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