Aluminum features, applications and sources

Aluminum is a silvery white light metal , a very wide range of applications , known as the second metal , its production and consumption is second only to iron and steel . Bo is the density of aluminum 2 .7 × 103kg / m3, about steel l / 3. When the cross-sectional area and length are the same, the conductivity of copper aluminum 64 %, if calculated by mass , its conductivity is 200% copper , good thermal conductivity . As can be formed on the surface of a solid layer of thin aluminum oxide film , can prevent further oxidation , therefore , the aluminum in the atmosphere , water and some corrosive medium high corrosion resistance . Aluminum, plastic, easy to withstand pressure processing, can be drawn into filaments or pressed into thin slices ; while being able to make it through the cold and hardened alloy .

Aluminum is characterized by a low density , high specific strength (strength to density ratio ) , but also has good ductility and corrosion resistance. In addition, most of the aluminum alloy can be enhanced to the heat treatment method . According to their composition and production process, aluminum can be divided into deformable aluminum and cast aluminum . Which can be wrought aluminum alloy hot rolled , cold rolled , stamping , extrusion , bending, curling and other mechanical processing, so a wider use . Rust-proof aluminum alloy can be divided into (A1-Mn and Al-Mg based alloy ) , hard alloy (Al-Mg-si and Al? Cu-Mg alloy ) , hard aluminum (A1-Zn-Mg-cu alloy ) , wrought aluminum (Al-Mg-si-cu -based alloys) .

Aluminum and Aluminum Alloys , mainly used in the construction industry , the production of windows and doors , partitions , ceiling, and outdoor decoration ; in the aerospace and defense industry sectors are also widely used aluminum alloys, manufacture of aircraft , ships , guns , etc. ; in power transmission , commonly used high strength steel wire reinforced aluminum cables for overhead lines ; addition , automobile manufacturing, container transport, daily necessities , household appliances , machinery and equipment and other fields have extensive use of aluminum and aluminum alloys .

With the production, consumption increases, the amount of waste aluminum products is also growing , and many are single-use aluminum products , products made to the product from the loss of use value is shorter, and therefore its disposal miscellaneous materials into the source of contamination . Meanwhile, aluminum and aluminum alloy is a kind of high environmental load materials , production requires a lot of power , therefore, how to make the best recycling of scrap materials, both the economic development needs, but also environmental protection requirements.

Miscellaneous scrap material stems from its wide range of applications . Differs in its use led to its composition, properties are quite different to the scrap material recycling and reuse create great difficulties . In order to cost less exhausted recycled aluminum , and to ensure the quality of recycled aluminum can continue to meet a variety of needs , the classification of scrap for recycling is very important. If you do not classify cleaning , screening and blind remelting , recycled product is not working, there may even become garbage again . To this end, the advanced industrial countries have developed a corresponding scrap standards or professional standards. For example, Japan's National Institute of Standards JIS (H119) based on aluminum scrap alloy type , recency , shape, divided into 28 kinds of sources , and the secondary alloy manufacturing processes and quality assessment have corresponding regulations.