Making the most of the latest technology
Removing aluminium-plastic compounds, light plastics and magnesium from aluminium scrap requires advanced sorting technology. One such technology which addresses this challenge and offers a reliable, robust and cost-effective alternative to sink-float separation is the latest application
TOMRA Sorting has developed for our X-TRACT unit which enables the removal of aluminium-plastic compounds and magnesium from aluminium in products such as Zorba.
During our test centre and in-field testing we put hundreds of tonnes of sorted and traded material through the X-TRACT unit with the belt running at 3m (10 feet) per second and achieved consistently high purity rates of up to 99%. This means the material can be traded more robustly and used in domestic or close-to-home markets. The system uses existing TOMRA XRT x-ray technology but in a new configuration so that it is capable of sorting material of different density levels. It can separate light materials, aluminium-plastic compounds and magnesium from aluminium to create furnace ready products – including what’s referred to as low magnesium Twitch – across the Zorba size spectrum from 5-120mm. This degree of separation of fines simply couldn’t be achieved using dense media plant processes and, until now, it wouldn’t even have been possible using TOMRA’s sensor-based sorting technology because magnesium is very similar in density to aluminium so the technology couldn’t recognise the difference between the materials.
Now though, the capabilities and combination of the x-ray technology used in TOMRA’s X-TRACT unit make it by far the most consistently accurate solution available on the market today. In our test centres in Germany and in the States, we have achieved consistently high purity rates of 99% recycled aluminium – meeting the requirements of end customers who specify magnesium-free aluminium or typically well below 0.5% by weight.