Aluminum is a chemical element in the boron group with atomic number 13 and the symbol Al. This element is a soft, white and hammerable low-density metal, which is the third most abundant element in the earth’s crust. Because of its very high reactivity, pure aluminum is rarely found naturally and there are various mineral gems instead. Most of the aluminum in the world comes from bauxite stone.
The term aluminum, sometimes written in Aluminum (especially in North America), is derived from the Latin word Lumen meaning “light”. Prior to the separation of aluminum, its oxide was called alumina. Humphrey Davy, who failed to make aluminum, aluminum, said he wanted to put the name “alumim”, but later changed it to “aluminum” to match alumina. However, the term aluminum was widely used because the name of many metal elements ends with “yam”. Aluminum with the AL chemical symbol and the FCC crystal network can dissolve elemental atoms such as carbon, nitrogen, hydrogen, and oxygen due to its small atomic radius as a soluble solid solution. The melting point is 660 ° C and its boiling point is 2470 °. Aluminum is not used at temperatures of 1000 degrees or more because it is highly oxidized and its waste is high, but magnesium and zinc have a higher amount of aluminum. The specific gravity is 2.7 and in the molten state it is 3.2. Therefore, it can be concluded that the molten state is more expanded. The percentage of contraction in the liquid phase is 10% and during freezing is 6.8% and it is necessary because of the high contractions in the aluminum components. The most important aluminum alloys are magnesium-copper-silicon-aluminum alloy, or alloys that combine these three elements, thereby increasing the mechanical properties of aluminum-aluminum corrosion and corrosion resistance. However, aluminum and its alloys, due to the low melting point, have a lot of fluidity, increasing mechanical properties due to alloying as well as thermal performance. The equilibrium cooled curve of the metal material is different, for example, considering a particular aluminum with another alloy in a particular metal at a specific temperature of freezing. If it is in a freezing alloy at a thermal distance. Decontamination using active gases, such as chlorine: If the temperature reaches 180 degrees, the composition is bubble-shaped (volatile) and the hydrogene penetrates into it. The greater the depth of the molten gas, the greater the gasification or its efficiency. In practice, 0.6% of chlorine gas should be consumed depending on the type of furnace type alloy and the gas entry conditions and the mold preparation method and humidity. Gasoline decontamination is superior to nitrogen because chlorine gas produces a bubble of more or less aluminum.
History of the discovery of aluminum
Frederick Wahler generally believed in pure aluminum. But this metal was obtained two years ago by Danish chemist and physicist Hans Christian Erstad. In ancient Rome and Greece, it used the metal as a color stabilizer in dyeing and as a blood clot in the wounds, and is still used as a blood fixing agent. In 1761, Guitoun Demurova proposed to call alum alumin.
Genesis and Resources
Although Al is an abundant element in the earth’s crust (18%), this element is extremely rare in its free state and when it was a precious metal and more valuable than gold; therefore, it was recently considered as an industrial metal, and in Commercial scales have been used for over 100 years. At first, when the metal was discovered, it was very difficult to separate it from the rocks, and since the whole earth’s aluminum was combined, the hardest metal was to be considered.
Aluminum was for some time worth more than gold, but after inventing an easy way to extract it in 1889, its price declined and fell. Rebuilding this metal from scraps (through recycling) became an important part of the aluminum industry. Aluminum recycling is not a new issue, but from the nineteenth century there was a common practice. However, by the late 60s, this was a disadvantage until the recycling of aluminum cans eventually captured the metal. Aluminum recyclers include cars, windows, doors, home appliances, containers, and other products. An important feature of aluminum recycling is that there is no difference between the quality of recycled aluminum and the freshly produced aluminum.
Aluminum is a chemical element in the periodic table with the sign Al and the atomic number 13. Aluminum, which is a silver and flexible element, is found primarily in bauxite ore, and is considered to be resistant to oxidation, as well as weight and strength. Aluminum is used in the industry to produce millions of different products and is an important element in the world of economics.
Components of structures made of aluminum are very important in the aeronautical industry and in other transportation processes. Also, in structures where resistance and stability are needed, the presence of this element is important.
Aluminum is a soft and lightweight metal, but strong, with a silvery appearance – a matte gray and a thin layer of oxidation formed by exposure to air at its surface, from a rust corrosion. Hammering, flexible and easy to bend. It is also very durable and resistant to corrosion. In addition, this element is non-magnetism