Submit Manuscript | http://medcraveonline.com Abbreviations: XRF, X-ray fuorescence; TTT, time- temperature-transformation diagram; EDS, energy dispersive X-ray spectrometer; SEM, scanning electron microscopy Introduction Nowadays, in this second decade of this century, the industrial residues they continue generating environmental problems. Such of these wastes (glass cullet and bottom or fy ashes from the coal power stations) are still abundant and not defnitive applications or solutions for its immobilizing have been given, though a considerable amount of research has been conducted in the last years. One of the promising applications proposed by laboratories research has been their potential for being used in the construction industry. 1,2 With respect the glass cullet from the conventional glass there is abundant research carried out in the last decades of 20th and beginning of this 21st century. 3–5 Vitrifcation process has been demonstrated is an adequate processing method for inertize toxic and abundant residues and even to facilitate their recycling as secondary raw materials in ceramics and glasses industries. 6 Transforming of starting glasses after vitrifcation into glass-ceramics by controlled thermal treatment is possible to reach immobilizing of a wide range of industrial wastes (mineral residues, sludges from dumps, slags, ashes,). Besides, the low cost and great availability of waste make these glass-ceramics materials very attractive from an economical and technological point of view, so synthetic high-performance materials with broad applications in construction and civil engineering can be obtained from residues. 7 Therefore, it has been the aim of this research to explore the synthesis of a new type of glass-ceramic by the sinter-crystallization process from soda-lime-silicate glass and several ashes from a coal power thermal station located in Andorra (Teruel, Spain). Materials and methods The batch original composition for melting of an “mother or original” glass able for being transformed in a glass-ceramic was: 25 wt% bottom ash (from Andorra) , 15wt% fy ash (from Andorra), 10wt% calcium carbonate (industrial CaCO 3 ) and 50wt% of glass cullet (from the recycling glass sector). The chemical composition determined by XRF analysis of wastes and raw materials is shown in Table 1. X-ray fuorescence (XRF) dispersion wavelength equipment was the model S4 Pioneer – Bruker. The same Table 1 includes the XRF analysis of the fnal glass-ceramic. This mixture has been melted at 1500ºC during 1 hour in a lift furnace by using a refractory crucible and then, the glass composition has been quenched in cold water to obtain glassy granules, ready to be wetly milled in an alumina ball mill under 45μm. The dried glassy powder (24h at 110ºC) has been moistened at about 10 wt% to be pressed with a Nannetti® uniaxial press up to a pressure of 30MPa in the shape of rectangular glassy pieces. The pieces were subjected to the thermal fring cycle in a muffe kiln (Nannetti®), which has been achieved by varying the maximum temperature (700ºC-1000ºC) and the residence period (30min/10h) in order to elaborate the corresponding Time- Temperature-Transformation diagram (TTT). The different heat treated samples at successive temperatures and time for drawing the TTT diagram was characterized by XRD and SEM/EDS. Crystalline phases were identifed X-ray diffraction (XRD) and by using a Bruker- AXS D4 Endeavor equipment (using Ni-fltered Cu-Kα radiation with scanning speed of 2º (2฀) per minute and registering the diffraction pattern in the 10º-80º Bragg angle range. The microstructure was observed by scanning electron microscopy (SEM) JEOL 7001F with energy dispersive X-ray spectrometer (EDS) operating in the 15-20kV interval. Material Sci & Eng. 2019;3(5):189‒193. 189 ©2019 Lyubenova et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and build upon your work non-commercially. Vitrifcation and sinter-crystallization of fy ash with glass cullet Volume 3 Issue 5 - 2019 Stoyanova Lyubenova T, Fraga D, Barrachina E, Calvet I, Carda JB Department of Inorganic and Organic Chemistry, Universitat Jaume I, Castellón, Spain Correspondence: Barrachina E, Department of Inorganic and Organic Chemistry, Universitat Jaume I, Castellón, Spain, Email Received: September 25, 2019 | Published: October 31, 2019 Abstract The synthesis of a new glass-ceramic obtained by sinter-crystallization has been investigated by using soda-lime-silicate glass waste and fy ashes from a coal power thermal station located in Andorra (Teruel, Spain). An original glass as frit with composition of 50wt% recycled soda-lime glass, 25wt% bottom ash, 15wt% fy ash and 10wt% CaCO 3 has been melted. After sinter-crystallization at 850ºC, it has precipitated two main crystalline phases: sodium anorthite and the hedenbergite. The linear shrinkage is 1/3 of the value of conventional porcelainized stoneware and the water absorption of this glass-ceramic is similar to a conventional porcelainized stoneware tile (less than 1wt%), being the apparent density slightly higher than this type of tiles (2.6g/cm 3 instead of 2.4g/cm 3 ). Flexural strength is near twice than porcelainized stoneware (around 950kg/cm 2 instead of 550kg/ cm 2 ) (95MPa in the new glass- ceramic with respect to 55MPa for the above mentioned as reference material). Keywords: recycling, industrial wastes, glass-ceramics, sinter-crystallization; fy ashes Material Science & Engineering International Journal Research Article Open Access