Development Of A Way To Recycle Waste Glasses:
Preparation Of Porous Materials From
Cathode-ray-tubes And/or Packaging Glasses
At The End Of Their Life Time
Author(s)
M. Cambon & B. Liautard
Abstract
French and European legislation concerning waste requires studies to be
performed on the recycling of products issued from commercial electronic
devices. Cathode ray tubes (CRT), and in particular glasses which constitute
them, are of major interest. The chemical composition of these glasses is very
important. Screen glass is composed of 8-12 wt% BaO and 6-10 wt% SrO and
the cone glass which has a lower wall thickness than that of the screen contains
19-23% PbO. Previous characterizations of these special glasses led us to
propose a way of recycling in which used CRT glass could be treated in order to
respond to the legislation. Foam glass could be a possible solution to convert
CRT glass into a material with very promising properties. A systematic study of
the process parameters showed the possibility of modifying the properties of the
porous material. The density can vary from 0.4 to 0.8 g.cm-3 and the mechanical
stress with a uniaxial compressive loading from 20 to 60 MPa. The materials
have good insulation properties: thermal conductivity K inferior to 0.25 Wm-1K-1
and εr between 2.1 and 3.1 at 25°C. They are non-combustible (like the bulk
glass), they resist corrosion in any environment and they present a low thermal
expansion coefficient.
Keywords: cathode ray tube glass, recycling, cellular materials, microstructure,
porosity, mechanical properties, electrical and thermal conductivity.
Keywords
cathode ray tube glass, recycling, cellular materials, microstructure,
porosity, mechanical properties, electrical and thermal conductivity.
Related Book
Other papers in this volume
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