Recycling has become an important way to reduce resource waste and environmental pollution.
Aluminum, as a lightweight, corrosion-resistant metal with high recycling value, occupies an important position in the field of recycling. This article will explore how to extract pure aluminum from recycling, analyze its properties, applications, and compare it with other metals.
A method of refining pure aluminum
1. Pretreatment: Recycled aluminum products first need to be sorted and cleaned to remove impurities and coatings.
2. Melting: The pre-treated aluminum products are heated to 660-700 degrees Celsius in the furnace to melt them.
3. Impurity removal: In the molten state, by adding flux and stirring, remove impurities in aluminum, such as iron, silicon, etc.
4. Refining: Through electrolytic refining or vacuum distillation and other methods to further improve the purity of aluminum.
5. Casting: Pour the refined aluminum liquid into the mold and form pure aluminum ingots after cooling.
Second, the characteristics of pure aluminum
1. Light weight: The density of aluminum is only 2.7g/cm3, much lower than other metals such as iron and copper.
2. Corrosion resistance: Aluminum will form a dense oxide film in the air, effectively preventing further oxidation.
3. Electrical conductivity: The electrical conductivity of aluminum is better than copper, but slightly lower than silver.
4. Plasticity: Aluminum has good ductility and is easy to process into various shapes.
Third, the application of pure aluminum
1. Transportation: widely used in lightweight design of vehicles such as cars, planes and trains.
2. Construction industry: Used to make doors and Windows, roofs, curtain walls and other building materials.
3. Packaging materials: Aluminum foil, cans and other packaging materials, with good moisture and preservation performance.
4. Electronic appliances: Used to make electrical and electronic accessories such as wires, cables and radiators.
4. Comparison with other metals
1. Weight: Aluminum is much less dense than iron and copper, so it has advantages in areas where weight needs to be reduced.
2.Corrosion resistance: The corrosion resistance of aluminum is better than that of iron, but slightly lower than that of stainless steel.
3. Electrical conductivity: The electrical conductivity of aluminum is better than that of iron, but lower than that of copper and silver.
4. Cost: Aluminum mining and refining costs are relatively low, so the price is more competitive.
By recycling and refining pure aluminum, not only can the environmental impact be reduced, but also the efficient use of resources. Pure aluminum has wide application prospects in many fields because of its light weight, corrosion resistance and good electrical conductivity. Compared with other metals, aluminum has obvious advantages in terms of weight, corrosion resistance and cost, and is one of the important materials to achieve sustainable development.
