Core-Shell Soda-Lime Glass Granules for Lower Melting Temperature
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Solution Overview
Problem
Conventional soda-lime glass batch materials require high melting temperatures and long residence times due to their uniform loose powder form, which leads to inefficiencies in energy usage and potential segregation of particles.
Innovation Solution
The development of core-shell granules for soda-lime glass, where an inner core and outer shell with differing chemical compositions are formulated to create a binary SiO2-Na2O system and a ternary SiO2-Na2O-CaO system upon melting, respectively, allowing for lower temperature and shorter melting times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the particle size of glass batch materials is reduced to decrease melting temperature and residence time, then the melting temperature and residence time are reduced, but dust creation increases and segregation of materials occurs
Solution Approach 1:
The glass batch is segmented into core-shell granules with distinct functional zones. The core contains materials requiring higher melting temperatures (e.g., silica, sand) while the shell contains materials with lower melting points (e.g., soda ash, limestone). This segmentation allows each zone to melt at its optimal temperature, reducing overall residence time while maintaining granule integrity to prevent dust creation and segregation.
Solution Approach 2:
The invention uses composite core-shell granule structures combining different glass batch materials with complementary melting characteristics. The core provides structural stability and requires higher energy input, while the shell facilitates lower-temperature melting and acts as a protective layer. This composite structure resolves the contradiction by enabling reduced residence time through the shell's lower melting point without compromising the core materials, while the intact granule structure prevents dust generation.
2Temperature
If the particle size of glass batch materials is reduced to decrease melting temperature and residence time, then the melting temperature and residence time are reduced, but segregation or separation of glass batch materials occurs
Solution Approach 1:
The glass batch is segmented into core-shell granules with distinct functional zones. The core contains materials requiring higher melting temperatures (e.g., silica, sand) while the shell contains materials with lower melting points (e.g., soda ash, limestone). This segmentation allows each zone to melt at its optimal temperature, reducing overall residence time while maintaining granule integrity to prevent dust creation and segregation.
Solution Approach 2:
The core-shell granule structure embeds the core materials within the shell materials, creating a nested configuration. The shell acts as a protective container that prevents direct contact and segregation of core materials with the furnace environment and other granules. During melting, the shell melts first and facilitates the controlled release and integration of core materials, maintaining compositional stability while enabling lower overall melting temperature.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The core-shell granule structure enables soda-lime glass to be melted at a lower temperature and in less time compared to traditional methods, improving energy efficiency and preventing segregation of glass batch materials.
Implementation Method 1
Each granule has an inner core and an outer shell with differing chemical and/or physical properties. The materials in the shell of each granule are formulated to produce a binary SiO2-Na2O system when melted, and the materials in the core of each granule are formulated to melt after the materials in the shell to produce a ternary SiO2-Na2O-CaO system.
Data Source
Figure 1A~1B
Figure 2
AI summary
A plurality of soda-lime glass batch materials are formed into granules that include a core and a shell surrounding the core. The core comprises a first portion of the plurality of glass batch materials, and the shell comprises a remaining portion of the plurality of glass batch materials. These core-shell granules can be melted in a glass furnace to produce molten soda-lime glass in less time and at a lower temperature than conventional soda-lime glass batch preparations.