Batch-To-Melt Conversion Kinetics In Sodium Aluminosilicate Batches Using Different Alumina Raw Materials

The batch-to-melt conversion in batches of sand, soda ash and corundum (C), alumina spinel (A), boehmite (B), or gibbsite (G) as Al2O3 carrier are studied using thermal analysis, X-ray diffraction, and 27 Al nuclear magnetic resonance spectroscopy. Laboratory-scaled batches are either heated continuously or quenched from 1600 deg C in a series of increasing dwell times. The results show that the conversion from the raw materials to the fresh melt proceeds in two kinetic stages. During the first stage (3-5 min), fast conversion of nearly 95% by mass occurs and the conversion coefficient increases in the order G