Feasible glass‐melting process assisted by microwaves

Abstract

The advantages of microwave (MW) energy processing have been verified in the sintering of a ceramic frit at a pre-industrial scale. The challenge of achieving high temperature using MW energy at such dimensions was overcome and a mix of natural raw materials was heated until its fluxing point. Changes in dielectric properties of the raw materials mix were also measured in situ with the increase in temperature, being in accordance to thermal processes of a conventional heating process. The properties of the resulting ceramic frit were compared with the same frit obtained by the conventional sintering method. Both frits showed similar thermal behavior regarding DTA-TGA, heating microscopy and XRD (only glassy phase was present). A Raman study confirms the existence of the mentioned glass phase. The application of the frits as glazes were performed and their properties were studied. As a result, glazes with similar properties were obtained which confirms that the MW energy processed frit is suitable for its application as a ceramic glaze. K E Y W O R D Sceramic frit, ceramic glaze, CO 2 emissions, MW dielectric properties, MW energy, time saving

Sheet-Type Flow Process Using Magnetic-Field-Induced Heating with Single-Mode Microwaves Applied to a Continuous Metal Nanoparticle Synthesis

“…During the past 20 years, many studies of MW heating syntheses have been conducted using organic and inorganic syntheses. − Moreover, MW heating provides the following attractive benefits: rapid internal heating, markedly shortened reaction time, and chemical reaction with high yield and selectivity. Some industrial processes were developed recently by application of MW energy in several fields, such as glass production . Because most of the MW heating systems are of batch-type, development of a flow-type apparatus suitable for a continuous synthesis has advanced during the last decade. − The authors have developed a flow-type MW heating apparatus that overcomes difficulties of uniform irradiation and MW penetration depth, which have persisted as general problems of MW heating. , As a reaction example using our apparatus, continuous syntheses of various metal nanoparticles were performed, yielding a narrow particle distribution. ,− …”

“…Some industrial processes were developed recently by application of MW energy in several fields, such as glass production. 16 Because most of the MW heating systems are of batch-type, development of a flow-type apparatus suitable for a continuous synthesis has advanced during the last decade. 17−30 The authors have developed a flow-type MW heating apparatus that overcomes difficulties of uniform irradiation and MW penetration depth, which have persisted as general problems of MW heating.…”

Evidence of a new phase in gypsum–anhydrite transformations under microwave heating byin situdielectric analysis and Raman spectroscopy

“…Microwave treatment of materials is a well-established technique that is increasingly employed in industry 1,2 with applications in many fields, such as the food, pharmaceutical, and chemical industries, 3 as well as for agriculture, medicine, and industrial mineral processing, [4][5][6][7][8][9][10] showing clear advantages in terms of efficiency, processing time, and product quality when compared to the more conventional heating technologies.…”