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Home » Technologies & Materials » Materials, Additives, Mixes » Cause Analysis Regarding the Ageing of Raw Materials for Ceramic Sanitaryware Applications

Cause Analysis Regarding the Ageing of Raw Materials for Ceramic Sanitaryware Applications

Ageing of ceramic raw materials is a well-known phenomenon, especially for casting applications. The basis for ageing is the mineralogical and chemical composition of the raw materials, supported by a smaller or greater degree of microbiological activities and triggered by duration and temperature conditions from excavation until
ceramic processing. Oxidation of sulphides like pyrite and marcasite will lead to an increase of the sulphate content that influences viscosity and thixotropy of ceramic slips enormously. Generally, barium carbonate is added to ceramic bodies to fix soluble sulphate in the form of nearly insoluble BaSO4. On the other hand, the influence of BaCO3 on the rheological behaviour of the slip and strength of the
green body must be considered.


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