Development Of A Recycling Technique Of Used Glass By Conversion To Porous Materials
Author(s)
K. Yanagisawa, N. Bao, M. Kariya, A. Onda, K. Kajiyoshi,
Z. Matamoras-Veloza & J. C. Rendón-Angeles
Abstract
The powders of used glass bottles were converted to porous plates by a newly
developed technique, which involves two steps, hydrothermal treatment of glass
powders at low temperatures and calcination at high temperatures in air for
foaming. The ordinary method to prepare porous materials from glass needs
vesicants such as calcium carbonate and silicon carbide that decompose at high
temperatures to produce gas, and the gas is trapped in softened glass to form
pores. The new technique can produce porous materials without any vesicants.
Water incorporated into the glass structure by hydrothermal treatments acts as a
vesicant. Water diffuses into the glass structure by hydrothermal treatments at
low temperatures of around 200°C, and is released as vapor to form pores in the
softened glass, when the hydrothermally treated glass is heated at high
temperatures over 650°C. Thus, this process gives porous materials with a fine
microstructure including closed pores at low temperatures in comparison with
the ordinary method. Porous plates (45 x 45 x 3 cm3 in size) with a bulk density
of 0.45g/cm3 were produced by hydrothermal treatment of the glass powder at
183°C in a large autoclave with an inside volume of 2.5 m3, followed by
calcination at 800°C in a continuous furnace with 18 m in length.
Keywords: recycling of used glass, porous materials, hydrothermal treatment,
foaming.
Keywords
recycling of used glass, porous materials, hydrothermal treatment,
foaming.
Related Book
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