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Castables manufacturer and you to analyze the causes of pouring powder

Time:2019/5/4 17:08:20

The self-pulverization phenomenon of refractory castables during construction is due to the reaction of hydrated products of calcium aluminate cement with acid gases such as CO2, SO2 and H2S in the atmosphere, which leads to the decomposition of hydrated products and the decrease of strength of refractory castables. It mainly includes three chemistry: carbonation reaction of calcium aluminate cement with alkali, carbonation reaction of calcium aluminate cement with alkali, and reaction of aluminate cement with sulfite. Process.




During the curing or natural drying process of refractory castables, with the evaporation of water, some salts such as soluble carbonate, phosphate, sulfite precipitate, some salts containing crystalline water weathering and dehydration, crystalline form change, accompanied by volume change, which aggravates the strength loss of refractory castables. There is also a kind of salts without crystalline water, such salts do not precipitate. It will bring about crystalline transformation and volume change, and has little effect on the surface strength of refractory castables, but will only affect the surface quality of refractory castables.


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