China Aluminum Network Aluminum is a chemical element whose chemical symbol is Al and its atomic number is 13.
shape
Aluminum has special chemical and physical properties. It is one of the more commonly used industrial metals today. It is not only light weight, strong in texture, but also has excellent ductility, electrical conductivity, thermal conductivity, heat resistance, and nuclear radiation resistance. It is a national An important basic raw material for economic development.
Natural distribution
The content of aluminum in the earth's crust is second only to oxygen and silicon, ranking third, and is a metal element rich in the earth's crust. Among the metal types, second only to steel, it is the second largest metal.
Physical and chemical properties
Aluminum is a light metal. Pure aluminum is silver-white, because it easily combines with oxygen in the air and forms a fine oxide film (alumina Al2O3) on the surface, so it is usually slightly silver-gray.
Aluminum reacts with dilute strong acids (such as dilute hydrochloric acid, dilute sulfuric acid, etc.) to generate hydrogen gas and corresponding aluminum salts. Unlike ordinary metals, it can also react with strong alkalis to form metaalumates and hydrogen. Thus think that aluminum is amphoteric metal.
At normal temperature, aluminum is passivated in concentrated nitric acid and concentrated sulfuric acid and does not react with them. Therefore, concentrated nitric acid is transported in an aluminum can (which can be maintained for about 180 hours).
Pure aluminum is soft and loses tensile strength at 300°C. Treated aluminum alloys are light and tough.
Aluminum recovery rate is not high
Category classification
According to the main composition of aluminum ingot can be divided into three categories: high-grade pure aluminum (aluminum content 99.93% -99.999%), industrial high-purity aluminum (aluminum content of 99.85% -99.90%), industrial pure aluminum (aluminum content 98.0% -99.7%).
Use of aluminum
Aluminum alloys are lighter and have higher strength and are therefore widely used in aircrafts, cars, and rockets.
Because aluminum has outstanding electrical conductivity and thermal conductivity, it can be used as an ultra-high voltage cable material. High-purity aluminum has more functions.
Aluminum is highly reducible at high temperatures and can be used to exercise high melting point metals. (This method of exercising metal is called "aluminothermic method")
Aluminium richness can be made into aluminum foil for packaging.
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