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Development and demonstration of foam glass process

Development and demonstration of foam glass process:
- Porous tiles ;
- Porous granules.

The fundamentals of the technology, of thermo insulating foam glass production, which utilizes vitrified ash formed in the process of toxic waste in plasma arc destruction, have been elaborated. The foam glass obtained is highly porous material of closed pores (porosity 92%) it does not absorb water (absorbility below 5%), it is inflammable, and does not emit toxic fumes, light (app. density 180 - 225 kg/m³), strength (compression str. about 2.4MPa) posses thermoinsolation 0.06W/mK, and high chemical and biological durability. Thus it represents a highly valuable material for various applications mainly in building industry and engineering. So far foam glass has been produced from one kind of raw material, mainly container glass cullet. Addition of other raw materials differing from glass in their chemical composition and properties have not been used. It refers particularly to toxic ash plasma vitrified, which, unlike the glass, contains small amounts of silica and sodium but great amounts of calcium, aluminium and iron, it crystallize easy and melts with difficulty.

The result of the project is the development of the thermo insulating foam glass technology by elaborating the fundamentals of the thermal foaming of mixtures of various glassy wastes. It has been established that it is possible to obtain foam glass from a mixture containing 30 wt.% of plasma vitrified ash and waste container or flat glass cullet of low quality, not suitable for the production of glass. It allows processing the glassy waste incineration products, including plasma process vitrified toxic ashes, into valuable product.

The result of the project is also the development of the technology principles of porous thermo insulating tiles production from mixtures composed of vitrified waste incineration ash and waste glass cullet, adjusted to the specific properties of components of the mixture, i.e. the softening and foaming temperatures, which are higher than those for traditional raw materials and very narrow interval of foaming temperatures. This technology enables partial recrystallization of the product, which results in the improvement of its mechanical properties. The foam glass tiles obtained under laboratory condition by foaming in steel moulds demonstrates properties described above.

The tiles can be coated with paint, coloured plasters used in building industry as well as vitreous enamel. As a material not absorbing water, chemically and bacteriologically resistant, it can be used for thermal insulation of the foundation of buildings on waterlogged areas, for the foundation of motorways, for insulation of pipelines. It is flowing on the surface of water and can be used to collect the petrol contaminations. As an inflammable, heat resistant to the temperature 5000 C it can be used for fire barrier in public buildings, as well as for lining of factory chimneys, through which chemically aggressive substances are emitted including those used in energetic for desulfurization of the combustion gases.

Another result of the project is the elaboration of the fundamentals of the technology of production of porous material in the form of granules of various dimensions. The granules can be used as aggregate for light weight concrete in the building industry, for renovation of the old historical buildings, for the grounds of motorways and others.

Elaborated technologies are waste consuming, giving valuable products and they can improve the economy of process of waste incineration.

Informations connexes

Reported by

University of Mining and Metallurgy
Mickiewicza 30
30-059 Krakow
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