In order to avoid damage to crushers and granulators, large and solid metal parts (e.g. cooling elements) and hard steel (such as screws, bolts and housings) have to be kept out of the electronic scrap mix.
Processing of scrap wood
Scrap wood is available as a secondary raw material for use as either a recovered material or fuel. For example, it can be made into particle board for the furniture industry or into pellets for use as fuel. In order to prevent damage at the wood mill, the roughly milled scrap wood has to be freed of hard metal such as nails, screws and hinges.
Scrap glass can be used in the manufacture of new glass. This allows for great savings in energy and raw materials. In any case, a prerequisite for this is a certain level of purity in the recycling glass. Foreign materials contaminate the molten glass and cause glass defects. Metals can even lead to damage in the glass melting tank. The reliable sorting of metals allows the use of scrap glass as a secondary raw material.
Processing of construction waste and waste incineration slag
Refuse derived fuels (RDF) are synthetic fuels. They are usually recovered from high calorific value waste. For this, industrial and commercial waste containing no more reusable synthetics, papers, textiles or composite packaging is specifically processed for reuse as an energy source. This involves the removal of any remaining metal which could otherwise result in residue deposition in, and damage to, the furnaces.
Processing of alternative fuels
Recycled building materials are used amongst other things in the building of roads and public thoroughfares as well as concrete buildings and earthworks. The purpose of the processing is to generate products from the secondary materials which represent a qualitatively viable alternative to primary materials. To meet the latest EU landfill requirements a rigorous metal removal is necessary.