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Environmentally appropriate complete utilisation of worn-out tires by cryogenic detonative and pirolitic technology

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The main goal of this project is to study the nature of processing of worn-out tires by cryogenic detonation and pyrolysis and to develop technology for their complete processing and utilization.

The details of research and technical objectives are as follows:
- selection of optimal regime for detonative destruction of tires;
- identification of detonation power needed for destruction;
- identification of optimal pyrolysis regimes obtained in the course of cryodetonative destruction of rubber of various dispersivity ranges.

Worn-out tires are wastes of rather big size. Their collection and storing demands vast areas, thus, as time passes, the problem of their utilization becomes more and more urgent both in the economic and environmental terms. One of most up-to-date technologies to be applied for such wastes processing is their cryogenic utilization targeted at producing costly powder made of quality rubber and extraction of metal-cord. This activity is environmentally indispensable versus extensively used current method of burning worn-out tires significantly hurting the environment. Presently the number of vehicles has grown drastically that in turn led to inevitably growing amount of worn-out tires requiring more storage areas and thus excluding more production areas from any economic activities.
Currently there exist two main ways to solve the problem of worn-out tires utilization.

They are as follows:
- Grinding of worn-out tires aimed at application of obtained powders in asphalt and bitumen mixtures for read construction. This is done both by mechanical grinding and cryodestruction in cryomills;
- Pyrolysis of worn-out tires aimed at obtaining a regenerate for tire production. Utilization of worn-out tires by means of pyrolysis has been previously done.
- Both methods demand preliminary treatment of wastes aimed at smaller size feed that could further be either subjected to cryoprocessing or pyrolysis. Mechanical treatment demands significant power and human resources. Detonative destruction of prior cooled tires is faster and more efficient than plain mechanical grinding. However one of the drawbacks of this method is the fact that metal-cord contains up to 15-20% base material of worn-out tires. This problem might be avoided by subsequent pyrolysis. Obtained products could further be applied as the regenerate for rubber production.

To implement the project, the preliminary laboratory trials have been conducted that proved prospectivity of this method. Thus, performance of the proposed project will allow to solve the problem of utilization of worn-out tires and production of useful raw material.
It has been planned to undertake physical and chemical studies both of cooling and detonative destruction of tires, and also pyrolysis processes of material in question. Upon the completion of this stage a technological chain of worn-out tires utilization will be identified.

Project duration is 2 years. The main stages include the following:
- Study of tires' strength vs temperature characteristics aimed at identification of cooling regime and optimal regime necessary to obtain raw material with required dispersivity in the course of detonative destruction (1st through 2nd year);
- Study of worn-out tires pyrolysis processes (1st through 2nd year);
- Practical application of technological chain for overall worn-out tires utilization at a certain production unit.

Based upon study of processes and tire properties at low temperatures and their further thermal treatment a technology of overall and environmentally acceptable utilization of tires will be developed. The Project implementation will result in practical application of the technology of worn-out tires complete utilization by cryodetonative destruction and further pyrolitical processing.
The results obtained during the project execution will be presented in few reports and papers: in the international "Shock waves" journal, on 10-th International Symposium on Flow visualization, on the meeting in the 5-th International Symposium on Engineering Turbulence Modelling and Measurements, on the 24th International Symposium on Shock Waves and the 19th International Colloquium on the Dynamics of Explosions and Reactive Systems. The paper will be published on Journals of Fluid Mechanics.

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University of Wales, Aberystwyth
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SY23 3BZ Aberystwyth
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Letzte Aktualisierung: 30 Oktober 2002

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Permalink: https://cordis.europa.eu/project/id/INTAS-2001-00792/de

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