Technological properties of glass-ceramic tiles obtained using rice husk ash as silica precursor

Abstract

This paper reports the results of a study focused on the obtainment of glass-ceramic by using rice husk ash (RHA) as silica precursor. RHA is a by-product generated in biomass plants using rice husk as fuel for kilns or in the rice mills to generate steam for the parboiling process.Worldwide, it is annually produced about 132 Mt of rice husk, which gives rise to a production of 33 Mt/year of RHA. Glass-ceramic tiles were produced by a sinter-crystallization process using a glassy frit formulated in the MgO-Al 2 O 3 -SiO 2 composition system. The realized glassceramics were studied according to ISO rules for sintering and technological properties (water absorption, apparent density, bending strength, Young's modulus, deep abrasion, Mohs hardness). To complete the investigation crystalline phase formation and microstructural characterization of the glass-ceramic materials was carried out using X-ray diffraction (XRD) and scanning electron microscopy (SEM). Finally, chemical durability tests on parent glass and derived glass-ceramics were performed. The results obtained showed that it is possible to use RHA to produce glass-ceramic tiles by a sinter-crystallization process, obtaining nepheline (Na 2 O*Al 2 O 3 *SiO 2 ) as main crystalline phase and forsterite (2MgO*SiO 2 ) at 900 °C. Regarding technological features, the sintered materials showed bending strength values and Mohs hardness higher with respect to commercial glass-ceramics like NeopariesR. Other properties as water absorption (0.5%) allowed to classify these materials into the Group BIa characteristic of high sintered ceramic tiles according to European Standard rule.

Quality optimization in briquettes made from rice milling by-products

“…These include the use of rice husk as biofuel for the generation of heat and electricity (Sookkumnerd et al, 2005;Goyal et al, 2008;Lim et al, 2012a), biosorption of heavy metals from single and mixed metal solutions (Krishnani et al, 2008;El-Shafey, 2010), vermicomposting for the production of organic fertilizer (Lim et al, 2012b), as animal feed after physical, chemical, or biological treatment (Vadiveloo et al, 2009), and as a support for solid-state fermentation (Kapilan and Arasaratnam, 2011). Rice husk ash (RHA), a product of rice-husk combustion, is useful as a material for building and construction (Khan et al, 2012;Yuzer et al, 2013), glass ceramic tiles and whiteware (Prasad et al, 2001;Andreola et al, 2013), reinforcement of aluminum alloy (Saravanan and Senthil Kumar, 2013), production of silica powder, activated carbon, and carbon-silica composite (Kumagai and Sasaki, 2009;An et al, 2011).…”

Thermal approach to evaluate the sintering–crystallization ability in a nepheline–forsterite-based glass-ceramics

“…Since the amount of nepheline progressively decreases from 750 (45.5 mass%) to 1000°C (40 mass%), it is possible to hypothesize that nepheline phase melts and, therefore, the glassy phase increases. The Rietveld-RIR analysis showed that glassy phase increases from 45 mass% at 800°C to 48 mass% at 1000°C confirming the bloating phenomenon [21].…”

“…In recent papers [20,21], the authors demonstrated the feasibility of producing an original glass in the SiO 2 -Al 2 O 3 -MgO-Na 2 O-based system from a rice husk ash mixture that incorporates B 2 O 3 and Na 2 O for facilitating the melting process.…”

Caracterização de Vidros Sódico-cálcicos Produzidos a Partir de Resíduos Sólidos

“…A CCA contém cerca de 85% a 90% de sílica amorfa 9 , que é uma importante matéria-prima utilizada na indústria cerâmica e civil. Trabalhos de pesquisa reportam o uso da CCA em muitas aplicações, como substituta do quartzo para a produção de esmaltes cerâmicos 15 , telhas cerâmicas 16 , na produção de tijolos 13,17 e no cimento Portland onde são incorporadas na mistura como agregado fino 18 . Da mesma forma, dois resíduos ricos em carbonato de cálcio e, portanto, potenciais para serem utilizados como fontes de óxido de cálcio na produção de vidros e, assim, contribuir na diminuição do impacto gerado pela exploração das reservas naturais de calcário, são as conchas de ostras (CDO) e as cascas de ovos (CO).…”