Hong Li, Gülin Demirok, Perla Ibarra-Munoz, Yingcheng Zhang, Ilkay Sökmen, Banu Arslan, Ann Jose, Ashutosh Goel
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Effects of alternative natural silicates on the kinetics of batch-to-melt conversion for E-Glass fiber
For the fiberglass industry making E-Glass fiber products predominantly, reduction in glass batch melting energy can be achieved by using alternative raw materials that improve the kinetics of the batch-to-melt (BtM) conversion process. The present study evaluates the effects of the following five types of natural silicate minerals: kaolin (comprising low [<5 wt%] and high [>50 wt%] “free” quartz), pyrophyllite, anorthosite, and wollastonite, on the BtM conversion process using a reference commercial E-Glass composition. The study used isothermal heat treatment of individual silicate minerals and batch samples containing them, infrared spectroscopy, powder x-ray diffraction, and differential scanning calorimetry (DSC) to characterize the stages of the BtM conversion process in detail. Based on the results of this study, a simplified reaction scheme or mechanism is proposed to account for the effect of batch chemistry on the BtM kinetics, namely, “free SiO2” + “free CaO” → CaSiO3 controls the kinetics of the batch melting. Relative to the E-Glass control batch made using kaolin, sand, and limestone, the DSC tests showed the benefits of using pyrophyllite (replacing kaolin and sand), anorthosite (replacing kaolin and some limestone), and wollastonite (replacing limestone) in lowering the BtM conversion energy (from room temperature [RT] to 1200°C) between 20% and 50%.
期刊介绍：
The International Journal of Applied Glass Science (IJAGS) endeavors to be an indispensable source of information dealing with the application of glass science and engineering across the entire materials spectrum. Through the solicitation, editing, and publishing of cutting-edge peer-reviewed papers, IJAGS will be a highly respected and enduring chronicle of major advances in applied glass science throughout this century. It will be of critical value to the work of scientists, engineers, educators, students, and organizations involved in the research, manufacture and utilization of the material glass. Guided by an International Advisory Board, IJAGS will focus on topical issue themes that broadly encompass the advanced description, application, modeling, manufacture, and experimental investigation of glass.
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