Method for producing cellular glass from waste glass streams
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United States of America Patent
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Mar 31, 2015
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Sep 28, 2012
filing date -
Jul 22, 2010
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Abstract
A method by which recovered glass from waste steams can be used to create a closed cell foam glass in the 9 to 13 lbs/ft3 density range using a single-step foaming process. The waste glass is mixed with foaming agents and the boron content is adjusted and maintained between 7 to 14% of the mixture. The mixture is formed into a charge and fired at a temperatures ranging from 100° C. to 250° C. above the softening point of the waste glass for a controlled period of time. The waste glass can be obtained from commercial waste streams of high borosilicate glass to common container glass from recycling sources. The glass is ground to an appropriate size and mixed with fluxes, enhancers, and foaming agents which are then properly dispersed within the mixture. The mixture batch can be adjusted with respect to the additives, firing temperature and schedule to produce the desired closed-cell end product which is water insoluble, acid resistant and has a low coefficient of expansion within the range of 33×10−7 to 55×10−7.
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