Effect of Mechanical Activation on the Heat of Fusion of a Conventional Batch Used for the Manufacture of Float Glass
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.442
Effect of Mechanical Activation on the Heat of Fusion of a Conventional Batch Used for the Manufacture of Float Glass J. López-Cuevas1,*, G. Vargas-Gutiérrez1, P.P. Rodríguez-Salazar1, and S.R. Ruiz-Ontiveros2 1 Cinvestav Unidad Saltillo, Calle Industria Metalúrgica No. 1062, Parque Industrial Saltillo - Ramos Arizpe, 25900, Ramos Arizpe, Coahuila, México 2 VITRO Vidrio y Cristal S.A. de C.V., Carretera a García Km 10, S/N, 66000, García, Nuevo León, México
*Author to whom any correspondence should be addressed ([email protected].)
ABSTRACT
An initial mixture of raw materials (batch) typically used for the manufacture of conventional soda-lime float glass was subjected to a mechanical activation process for 30 or 60 minutes in a planetary ball mill. An intensification of the chemical reactivity of the batch, which was directly related with the increase in the milling time, was observed. This accelerated the chemical reactions that took place during the batch melting process between sodium, calcium and magnesium carbonates and other components of the mixture, which happened at significantly lower temperatures with respect to the batch without mechanical activation. The heat of fusion of the batch, estimated using a methodology previously reported in the literature, indicated that the mechanical activation given to the initial mixture of raw materials decreased the energy consumed during the batch melting. This was also evidenced by a decrease in the temperature at which the release of CO2 ended, which was considerably larger than that previously reported in the literature based solely on the decrease in the particle size of a batch of similar composition achieved by dry sieving.
INTRODUCTION Finding new ways to reduce energy consumption and CO 2 generation during the melting of glass is an issue of the greatest relevance today for the global glass industry, both economically and environmentally. It has been mentioned [1] that the energy efficiency of said process can be improved by an appropriate conditioning of the
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initial mixture of raw materials (batch), which may consist of the use of a pre-melting milling in order to obtain a homogeneous material with a fine particle size. This facilitates the reactions and modifies the sequence at which they occur during the melting process, as a result of the greater contact area generated by milling between the particles of the constituents of the mixture. Consequently, an acceleration of the melting occurs, and this takes place at lower temperatures and in a more homogeneous manner, with respect to the conventional melting process. For instance, a decrease of up to 64% in energy consumption during the melting process of an aluminoborosilicate glass, usi
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