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The high temperature in a rotary kiln can severely exacerbate the damage to refractory materials. C3A and C4AF in the melt of cement clinkers are corrosive. The overheating in the kiln can severely exacerbate the damage of thermal stress.


The higher the kiln speed is, the higher the output is, the bigger the damage of mechanical stress and fatigue.


Components such as alkali, chlorine and sulfur are corrosive. Sulfates and chlorides are volatile chemicals. They volatize and are enriched via repeated cycle. This exacerbates the potential of structural spalling.


Since the diameter of the kiln is large Cheap Air Max Axis 2020 Australia , the skin of the kiln is not stable.


The structure of the kiln is complex. The mechanical and electrical failures increase. The frequent turning on and shutdown of the kiln exacerbates the damage.


Refractory bricks used in the rotary kiln include high alumina bricks, alkali resistant bricks and basic refractory bricks.


(1)High alumina bricks


Non-basic bricks are silicate alumina refractory products contain more than 48% Al2O3. It is composed ofα-Al2O3, mullite and glass phase. Its content is up to the ratio of Al2O3SiO2 and the types and amount of impurities.


According to the content of Al2O3, non-basic bricks can be divided into Grade Ⅰ (Al2O365%-70%) Cheap Air Max 98 2020 Australia , Grade Ⅱ (Al2O355%-65%) and Grade Ⅲ (Al2O348%-55%).


Wear resistant bricks, mullite red bricks, silica mullite bricks and spalling resistant bricks used in the rotary kiln belong to high alumina bricks.


(2) Basic bricks


Basic bricks used in the rotary kiln include magnesia alumina spinel bricks, magnesia iron spinel bricks and direct bonded magnesia chrome bricks.


In order to improve the thermal stability of magnesia bricks Cheap Air Max 97 2020 Australia , aluminum oxide or iron oxide is added to the raw materials to produce magnesia bricks with spinel as the main structure. A thin protective layer of calcium aluminate is generated when the oxides react with the clinker. Liquid phase cannot penetrate into the bricks with the p