Recycling of Cathode Ray Tube Glasses and Utilizing the Waste Glasses in the Roof Tile Industry of Sri Lanka
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Date
2018
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Publisher
Uva Wellassa University of Sri Lanka
Abstract
With the development of the technology the Cathode Ray Tube (CRT) monitors are
being replaced by modern Liquid Crystal Display (LCD) or Light Emitting Diode
(LED) display screens, transforming the used CRT monitors into a major e-waste.
CRT glasses contain lead (Pb) as a constituent to an extent of 18% - 22% w/w. The
emission of lead to the environment causes numerous harmful effects to the living
beings. Sri Lanka has a burden of nearly 140,000 Mt of CRT glasses as e-waste and
appropriate measures should be taken to dispose or recycle CRT glass waste.
Current study proposes to utilize CRT waste in the roofing tile industry as a glaze or
body mix. CRT glass powder was directly mixed with red clay in a range of ratios,
while examining the modulus of rupture, water absorption, shrinkage and the
amount of lead leaching of the glass powder and red clay mixture. The red clay was
procured from the silt deposits in irrigation tanks in North Central Province of Sri
Lanka. The best percentage of CRT glass powder, which was added to red clay was
determined as 15%. The lead leaching rate of the material corresponds to that ratio
of 15% CRT powder into red clay, retained at a rate of 0.94 ppm implying that rate of
releasing lead is considerably low and it would not emerge harmful causes to the
environment. The addition of CRT glass powder exhibited relatively better
vitrification and finishing, depicting the potential to utilize the application in the
commercial glass industry. It can be concluded that the waste CRT glasses can be
utilized economically as an eco-friendly material in a novel technological way,
where findings of the application of waste CRT in Roof Tile Industry.
Keywords: CRT glass, Lead, Modulus of Rupture, Red Clay, Glaze, Recycle
Description
Keywords
Materials Sciences, Mineral Sciences