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Top articles
- How is ceramic fiber made?
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- What is the temperature limit for ceramic fiber?
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- What is the use of refractory ceramic Fibre?
- Is ceramic fibre a good insulator?
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- How do you handle ceramic fiber?
- What is thin thermal insulation material?
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Which chemicals will affect the refractory ceramic fiber?
Several chemicals that can corrode refractory ceramic fiber include fluorine, fluoride, vanadium and other heavy metals, phosphoric acid, strong alkali, etc.
(3) Sulphur and sulphuric acid.
Refractory ceramic fiber has good resistance to sulfuric acid, but in rare cases, it may also has some minor chemical reactions, and the typical reaction product is aluminum sulfate (Al - (SiO4z) or aluminum sulfate hydrate. Generally speaking, this reaction will not cause fiber damage. In fact, the corrosion of metal anchoring parts needs special attention. Asphalt coating or stainless steel film shall be used to protect metal anchoring parts, or ensure the temperature of metal anchoring parts is higher than the dew point temperature of sulfuric acid, generally 121~177 ° C. When iron (Fe) and sulfuric acid (HzSO4) coexist, refractory ceramic fiber will produce iron oxide alumina silica composite sulfate. This compound will "dissolve" the anchoring parts and furnace shell, making the anchoring parts become similar to gray rock. Generally, the fiber will turn yellow after contacting with sulfur. It is generally believed that the deposition of sulfur on the fiber surface will affect the fiber crystallization process at about 980 ° C.
The reaction of sulfur and refractory ceramic fiber is generally distributed on the fiber lining surface in a discontinuous manner. This reaction is considered to make the fiber surface form a uniform powdery layer, which will cause the lining material of the hot surface to fall off under the condition of mechanical force (such as vibration) or airflow scouring. The materials gradually lost from the hot surface and the new surface will be exposed, which is easy to be further eroded, thus making the above reaction process self repeat. Only after a long time of use can these reactions cause substantial damage to the whole furnace lining. For the fiber lining of the layered structure, it may be necessary to regularly replace the fiber blanket on the hot side. If fiber modules are used, it is necessary to spraying a layer of ceramic coating material on the fiber surface
Next issue we will continue to introduce chemicals that will affect the refractory ceramic fiber. Please stay tuned!
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