Aluminium is a silvery white and shining metal. its member of the 13 group of chemical elements in the periodic table. It has the symbol Al and its atomic number is 13. Aluminium is the most common metal in the Earth's crust, and one of most common element in nature. It makes up about 8% weight of the Earth's surface. Aluminium never occur in nature as a free metal becouse is to reactive, but it is found combined in over 270 different minerals. The main source of aluminium is (baoksajd) bauxite ore.
Bauxite is an aluminium ore and is the main provider of aluminium. In this rock is about 60% of aluminum hydroxide. Bauxite was named after the village Les Baux in southern France, where it was first discovered and named by the French geologist . In 2007, Australia was one of the top producers of bauxite with almost one-third of the world's production.
Passivation is chemical reaction betwen concentrated acid which is an oxidant (ex. nitric acid) and with the metal. Metal is coverd by his oxide, and its make him less reactive than before.
Auminium and its alloys are used for example in aerospace industry and are very important in other areas of transportation and building. Its reactive nature makes it useful as a catalyst or additive in chemical mixtures.
Despite its common in the nature, aluminium salts are not known to be used by any form of life. In the ground is large numbers of aluminium salt which are well tolerated by plants, but a less by animals.(sojlebojl) Soluble aluminium salts have some toxic influence to animals if delivered by unnatural ways, such as injection.
Aluminium is fully (ricajkolebol) recyclable without any loss of its natural qualities. Reycling has become important aspect of the aluminium industry.
In Europe level of aluminium recycling is very high, about 42% of beverage cans, 85% of construction materials and 95% of transport (wilkus) vehicles are recycling.
Recycled aluminium is known as secondary aluminium, but has the same physical properties as primary aluminium. Secondary aluminium is produced in a wide range of formats.
Recycling involves melting the scrap . Process that requires only 5 to 10% of the energy used to in produce aluminium from ore. This way we can save about 90% of energy. 15% of the input material is lost as dross. Dross is obtained in primary aluminium production too.
This dross isn't waste. Dross from primary and secondary aluminium production contains useful quantities of aluminium that can be obtained industrially, of corse we must use more energy to obtain pure alluminum from dross byt it's payable