Premium
Thermal Analysis of Reactions in Soda–Lime Silicate Glass Batches Containing Melting Accelerants: II, Multicomponent Systems
Author(s) -
Hong Kug Sun,
Lee Sang Won,
Speyer Robert F.
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb03648.x
Subject(s) - eutectic system , sodium silicate , mineralogy , materials science , silicate , phase (matter) , feldspar , chemical engineering , chemistry , nuclear chemistry , metallurgy , microstructure , quartz , organic chemistry , engineering
The glass melting reactions in a multicomponent system (sand–soda ash–calcite–dolomite–feldspar) were studied using data from DTA, TGA, and XRD interactively. The first‐formed liquid phase occurred at 700°C from eutectic melting among CaCO 3 , Na 2 CO 3 , and MgO. Further liquid phase formed at the CaCO 3 –Na 2 CO 3 , eutectic at 785°C and a fusion reaction among SiO 2 , CaO, and the molten phase at 812°C. Reactions between molten soda ash and silica grains to form a sodium disilicate coating also occurred in this temperature range. The effects of reaction accelerant additions (Na 2 SO 4 , NaNO 3 , NaCI) on batch fusion were analyzed. Sodium chloride was found to be the most effective melting accelerant due to the formation of a NaCI–Na 2 CO 3 eutectic liquid phase at ∼636°C, which effectively attacked the silica relic. CO 2 gas release terminated ∼80°C earlier with 1 wt% NaCI additions to the base glass.