R - Aluminium Articles
Opencast mining requires lots of space. In recent years, local legislation or contracts between governments or landowners and mining companies has required subsequent complete recultivation of mining sites to protect the environment. Once bauxite mining has finished, the land has to be transformed so that it can be used either for
Recycling is carried out on a large scale in the aluminium industry. Compared with the production of primary aluminium, recycling saves raw materials and large amounts of energy. Scrap from aluminium processing and used aluminium products are both recycled.
This section covers several aspects.
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Depending on the mix and composition, aluminium scrap can be remelted or refined; specialist companies carry out these processes. Remelting can be carried out in various types of furnace. A rotary drum furnace is still the most efficient solution for scrap with a high level of contamination or for handling dross and skimmings. In such a furnace,
The aluminium recycling industry processes different forms of aluminium scrap. As a basic principle we distinguish between new scrap and old scrap.
New scrap (or process scrap) is the term used to describe the aluminium scrap produced during the manufacture and fabrication of aluminium alloys until such a time as the products are sold to
In many cases, the scrap to be recycled has to be sorted into type and size using various techniques (magnetic sorting and eddy current sorting, flotation, testing, etc.). Depending on the quality and the amount of impurities in the form of other materials, such as coatings, paint, oil, etc., coatings are subsequently removed from the scrap. This
Hot-mill trains are very capital intensive and have specific production characteristics. Strip casting offers an alternative. In this process, 2–30 mm thick strip is produced by pouring molten aluminium through a type of nozzle into the gap between the rolls of a two-high breakdown rolling stand. These rolls are water cooled on the inside and the
A characteristic feature of blind riveting is the fact that the joining element is only inserted and closed from one side. The use of blind rivets offers benefits in many joining applications. By using blind rivets and adhesives simultaneously it is possible to produce joints that are impervious to liquids.
The following figure shows a Chobert
Turning and milling are the classic methods to give form to prototypes and new workpieces. Rapid Prototyping is a newer shaping method which helps to save time in the process.
Rapid Prototyping techniques, also known as generative processes, have been known in the United States since 1987 and in Europe since 1990. At first they were seen as exotic
Most metals and their raw materials are produced around the world, with aluminium and bauxite being no exception. This does not hold true for rare earths. Processing capabilities are limited mostly to China, enabling her to influence global prices and supplies. This is the finding of a US government study on rare earths and their importance for
A survey conducted by the German Wirtschaftsverband der Metallgrosshändler (WGM) among its members has found that prices for semi-finished metal products are rising again. Higher prices are also expected for gray goods made from aluminium and non-ferrous metals.
Semi-finished goods such as sheets, rods or pipes are the most frequent delivery form