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Glass Waste Utilization in Construction Materials

#1131


Methods of TV-tube Glass Utilization as Radiation Protective and Special Building Materials

Tech Area / Field

  • ENV-WDS/Waste Disposal/Environment

Status
8 Project completed

Registration date
15.10.1997

Completion date
19.12.2001

Senior Project Manager
Kulikov G G

Leading Institute
State Institute of Physics and Technology, Russia, Moscow

Supporting institutes

  • Moscow State University of Construction, Russia, Moscow\nRussian Academy of Sciences / Institute of Nuclear Research, Russia, Moscow\nNPO Radon (2), Russia, Moscow

Collaborators

  • Berlin Oberspree Sondermaschinenbau GmbH (BOS) , Germany, Berlin

Project summary

Nowadays colour vision TV-tubes are from ecological and technological viewpoints one of the mostly complicated type of wastes for utilizing being in multitude. Coincident with the development of television technology, bulk of used and obsolete TV-tubes is increasing rapidly in the world. At the moment there are more then 20 millions of the TV-tubes to be utilized in Europe. The countries of South America and South East Asia are faced with this problem too. The utilization of the used TV-tubes is the hard technological and environmental problem.

For technological reason it is very difficult to recycle the TV-tubes in the manufacture of new TV-sets. For the environmental reasons the TV-tubes glass can not be used for production of consumer goods. The TV-tubes incorporating lead and toxic screen covering are the environmental problem. By now there are not at all efficient technology of TV-tube glass utilization.

The objective of the project is a development of the effective technologies of utilization of TV-tube glass, which take full advantage of their physical and chemical properties so as radiation-protective, high-strength, and anticorrosive properties. The two new technologies are proposed in the project.

The first one is technology of the production of the new building materials based on TV-tube glass. The tentative research has shown a possibility to use the powdered TV-tube glass as a substitute for cement in the manufacture of concrete. In physical and technical properties the samples of concrete articles produced without cement are highly competitive with high-strength samples of concrete. The new technology developed by us does not need for heating to high temperature but only requires crushing TV-tube glass to powder. What's more the proposed technology does not need for preliminary separation of TV-tube glass and removal of toxic components of TV screen surfacing as opposed to the traditional technology of TV-tube utilization. The harmful components are fixed into concrete matrix.

Owing to the protective properties available in TV-tube glass its application in the production of shielding materials for atomic and nuclear technologies appears to be highly ecologically and economically efficient.

The major advantage of the materials like those is high level of bending and compression strength, better anticorrosive properties particularly in alkali media. The new materials are not toxic and considered to be ecologically harmless. The technology of manufacturing the articles of the new material is similar to that of ceramics and cemented concrete.

Anticorrosive silicate materials are applied as chemically aggressive media protectors and frequently are used as materials, which can be exploited without any kind of anticorrosive coating for engineering constructions, equipment, erections, tanks etc. The suggested material can successfully substitute acid resistance ceramics and can be employed to manufacture various building blocks with application of fireless and more productive technologies.

Anticorrosive composites manufactured on the basis of TV-tube can be applied in production of engineering constructions, devices and other facilities to be exploited at radiochemical industry enterprises as well they can be of use for various tank constructions to store liquid and solid radioactive wastes. The development of compositions utilizing TV-tube scrap glass possessing compression strength not less than 300 kgm/cm2 with specific anticorrosive and gamma ray protective properties. The compositions are supposed to be manufactured by fireless technologies in the form of construction details like bricks, plates and others.

The second line of project is development of new materials based on TV-tube glass for radioactive waste storage and disposal. Radioactive waste treatment technologies are very complicated and expensive. This is due to waste disposal technologies must be followed closely to environmental safety standards.

In order to convert low- and intermediate-level radioactive wastes to compact solid insoluble wasteforms, vitrification process is the most promising. This includes high-temperature treatment of radwaste with silica-based flux to produce aluminosilicate or borosilicate glass with high chemical durability and radiation stability making available safe immobilization of radionuclides.

Silicate glass formation requires high temperature (1300-1600 °C). Radioactive waste vitrification at these temperature results in elevated radionuclides volatilization, especially cesium-134 and cesium-137. In order to decrease the volatilization boron-containing additives, such as datolite, must be admixed to flux composition. Boron oxide decreases glass viscosity too. The same may be reached using prepared fluxing agents such as TV-tube glass.

Preliminary tests have shown radioactive waste immobilization with TV-tube glass is available. Very low leach rates of radionuclides ensure high safety for long-term waste storage. Molten glass resistively and viscosity values permit electric melting of glass and continuous mode of pouring.

The use of TV-tube glass for radioactive waste immobilization is efficient. It does not require pre-cleaning of TV-tube screens from hazardous species. Screen coatings during vitrification process are fixed into glassy matrix commonly with radwaste to be long-term isolated from biosphere. The development of methods employing TV-tubes and TV-tube scrap-glass in technologies utilizing radioactive waste products will allow to use the exhaust TV-tubes avoiding the preliminary removing ecologically harmful substances contained in TV-tubes. The processing of radioactive waste products together with exhaust TV-tubes will result in the increasing of TV-tubes economical efficiency at the expense of diminishing the investments on ecological safety while processing.

As foreign collaborator the German firm Berlin-Oberspree Sonder-maschinenbau GmbH (BOS) participates in this project. BOS is developer of device for dismantling TV-tubes and for dry removal of toxic materials from TV screens. The role of BOS in the project is to take part in the join work on dismantling TV-tubes and preparation of raw materials for the new products based on the TV-tubes. It is proposed to include the BOS technology of dismantling TV-tubes as an initial stage of the new materials production.

A realization of the project will make a contribution to the cooperation of researchers and engineers of the four Russian institutions and enterprises engaging in development of the weapon and radioactive waste treatment technologies. Also this project can be a contribution of Russian researchers to international cooperation focused on utilization of TV-tube glass and on the solving environment radioactive safety problem.

Institutions, firms and experts from Europe, US, Japan and Norway are invited to participate in this project as collaborators. The following forms of participating in the project is possible:


1) Joint works on the distinct project lines;
2) Exchange of information during project implementation;
3) Joint seminars, workshop, consultations;
3) Joint promotion of the developed technologies onto the market.


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