Abstract
The granulometrical, chemical, mineralogical and microestructural characterizations of 9 kaolins and 4 clays widely used as raw materials at the Manises ceramic cluster were performed. Technological properties such as viscosity, thickness formation speed, shrinkage, water absorption and apparent density of all materials were studied. The aim of the work is to analyse the relationships between the characteristics of the materials and their technological properties, paying special attention to the kaolinite crystallite size. Significant relationships between kaolinite crystallite size and properties after firing such as water absorption and apparent density were found. The most important characteristic was the clay fraction, showing relationship with water absorption, apparent density and casting rate.
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