Graphite rotor plays an important role in the purification process of liquid aluminum alloy. In the purification treatment process, the purification gas and the solvent are mixed, and the method of purifying the aluminum melt by the rotary injection of the graphite rotor is the most advanced treatment method in the world.
The working principle of the graphite rotor is that the rotating rotor breaks the nitrogen (or argon) blown into the aluminum melt into a large amount of dispersed bubbles and disperses them in the molten metal. The bubble in the melt relies on the gas partial pressure difference and the surface adsorption principle, absorbs the hydrogen in the melt, adsorbs the oxidized slag, and is taken out of the melt surface as the bubble rises, so that the melt is purified. Due to the small dispersion of the bubbles, it is uniformly mixed with the rotating melt, and then rotates in a spiral shape and slowly floats. The contact time with the melt is long, and the air flow generated by the continuous straight rise does not form, thereby removing harmful hydrogen in the aluminum melt, which is remarkable Improve the purification effect.
Aluminium is the most widely used metal after iron. It has a low density, is malleable and easily worked. It is also corrosion resistant and a good conductor of both heat and electricity. With the exception of corrosion resistance, all these properties can be improved or augmented by alloying aluminium with small amounts of other metals. It is therefore not surprising that aluminium has a very wide range of applications.
Uses of aluminium
Pure aluminium is used principally by the electronics industry for capacitor foil, hard disc drives and conductor tracks on silicon chips. However, when alloyed with small amounts of other metals such as copper, zinc, magnesium and with silicon, aluminium becomes stronger (and can be made even stronger than steel). For example, duralumin (dural) is an alloy of aluminium, copper, manganese and magnesium, aluminium constituting ca 94%.
Aluminium and its alloys are extensively used in transport applications (trains, aeroplanes, ships and cars) where their low density helps reduce fuel consumption and carbon emissions. Bicycles can also benefit from reduced weight and increased strength.
Another important use of the alloys is in packaging, particularly in drinks cans and in foil to protect food. Household uses include saucepans and other cooking utensils, and in buildings the alloys are used extensively in windows, doors and cladding.
Figure 1 Uses of aluminium