Characterization of ceramic masses using raw material of Para, Brazil: kaolin in natura

The incorporation rejects to the mixtures has if shown viable in the reduction of the environmental liability and for the obtaining of a better quality of the ceramic mass. In the present work, is tried to study the potentiality of the use of ceramic formulations with the addition of kaolin in natura to the clays. Formulations with two clays of the area of the municipal district of Maraba with addition of up to 60% in kaolin weight were prepared and characterized. For the determination of the physical and mechanical properties proof bodies were made by prensagem uniaxial and later burned in temperature from 900 to 1200 deg C with landing of 3 hours. The raw materials were characterized through diffraction of rays X (DRX) and thermogravimetric analysis. The proof bodies prepared were used for determination of the lineal retraction (RL), absorption of water, apparent porosity, apparent density, loss to the fire and rupture module the flexing. The results were satisfactory for the smallest kaolin tenors in the ceramic mass, and the mass with 20% presented rupture module elevated, in the temperature of 1200 deg C. (author)