るつぼ式省エネルギー型アルミニウム合金リサイクル炉の開発

抄録

  Most aluminum scraps are disposed or exported overseas because they are difficult to recycle due to oil adhesion and their coating. Conventionally, these scraps are pretreated to eliminate water and oil by centrifuge and drying in a rotary kiln furnace. However, we have developed a recycling system which can remelt aluminum scraps without pretreatment, produces no smoke, uses less energy, provides high aluminum yield. This system also enables recycling of scraps such as chips and foil with high efficiency. During the recycling process, the oil and water contents affect energy consumption to a great extent. Although oil contamination helps saves energy by combustion, energy consumed by water evaporation has a negative effect. The smoke generated during the melting process transforms the melting atmosphere into a less oxidizing atmosphere. Consequently, these contaminations contribute to improving the melting conditions favorably. The recycled ingots include small nonmetallic inclusions and their composition is within the range of JIS standards.