Elaboration of new ceramic composites containing glass fibre production wastes

Abstract

Two main by-products or waste from the production of glass fibre are following: sewage sludge containing montmorillonite clay as sorbent material and ca 50% of organic matter as well as waste glass from aluminiumborosilicate glass fibre with relatively high softening temperature (> 600 ºC).&#13; In order to elaborate different new ceramic products (porous or dense composites) the mentioned by-products and illitic clay from two different layers of Apriki deposit (Latvia) with illite content in clay fraction up to 80-90% was used as a matrix. The raw materials were investigated by differential-thermal (DTA) and XRD analysis.&#13; Ternary compositions were prepared from mixtures of 15–35 wt % of sludge, 20 wt % of waste glass and 45–65 wt % of clay and the pressed green bodies were thermally treated in sintering temperature range from 1080 to 1120 ºC in different treatment conditions. Materials produced in temperature range 1090–1100 ºC with the most optimal properties - porosity 38-52%, water absorption 39–47% and bulk density 1.35–1.67 g/cm³ were selected for production of porous ceramics and materials showing porosity 0.35–1.1%, water absorption 0.7–2.6 % and bulk density 2.1–2.3 g/cm³ - for dense ceramic composites. Obtained results indicated that incorporation up to 25 wt % of sewage sludge is beneficial for production of both ceramic products and glass-ceramic composites according to the technological properties. Structural analysis of elaborated composite materials was performed by scanning electron microscopy(SEM). By X-ray diffraction analysis (XRD) the quartz, diopside and anorthite crystalline phases were detected.<br><br>Durante la obtención de ciertas fibras de vidrio se generan dos subproductos o residuos principalmente: Lodo de arcilla montmorillonítica capaz de adsorber el 50 % de materia orgánica y un vidrio silicato alumínico con temperatura de reblandecimiento relativamente alta (> 600 ºC). &#13; Con el fin de elaborar nuevos materiales cerámicos, tanto porosos como densos, se han utilizado estos dos residuos y unas arcillas procedente de unos depósitos mineros de Apriki (Letonia) cuyo contenido en la fracción illítica es > 80 %. Todas las estas materias primas se han estudiado por análisis térmico diferencial (ATD) y análisis por difracción de rayos X (DRX).&#13; Se prepararon diferentes mezclas de los tres componentes con 15-35 % en peso del lodo, 20% en peso del vidrio y 45–65 % en peso de las arcillas y después de prensarlas fueron tratadas térmicamente para su sinterización en un rango de temperaturas entre 1080 y 1120 ºC y con diferentes condiciones. Los materiales obtenidos a temperaturas entre 1090-1100 ºC y con las mejores propiedades (porosidad 38-52%, absorción de agua 39–47% y densidad 1,35 – 1,67 g/cm³, fueron los seleccionados para producción de cerámica porosa y los materiales con porosidad 0,35–1,1%, absorción de agua 0,7–2,6% y densidad 2,1–2,3 g/cm³, para materiales cerámicos densos. Los resultados obtenidos indican que la incorporación...

Glass-Ceramic Materials Obtained by Sintering of Vitreous Powders from Industrial Waste: Production and Properties

“…In any crystallization process, there are specific structural changes that generate crystalline phases. In this investigation, anorthite, augite, enstatite, and diopside in different quantities were found for each material, which are common crystalline phases in glass-ceramic materials with high aluminosilicate content [30,31].…”

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