How to turn old tyres into abrasives and other useful things
OLD tyres are notoriously difficult to recycle, and often end up in landfills, but researchers at the Tubitak Marmara Research Centre in Gebze, Turkey, have come up with a novel way to deal with them. They are reacting them with sand and turning them into silicon carbide, a material that can fetch up to €10,000 ($13,000) a tonne.
Silicon carbide, known commercially as carborundum, is formed of carbon and silicon atoms arranged in a diamond-like pattern, which results in diamond-like properties. On the Mohs scale of mineral hardness, which has diamond as ten, carborundum scores nine or better.
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