Q1: How is aluminum made from bauxite ore?
Bauxite is refined into alumina using the Bayer process. Alumina undergoes electrolysis to become molten aluminum. Liquid metal is cast into 25kg ingots. Alloying elements create different grades. Producing 1 ton consumes ~14,000 kWh of electricity.
Q2: Why is recycling aluminum greener than new production?
Recycling uses only 5% of original production energy. It cuts CO2 emissions by 95%. Melting point is 660°C vs. 950°C for new aluminum. Recycling one can powers a TV for 3 hours. 75% of all aluminum ever made is still in use.
Q3: How is aluminum foil made so thin?
Hot rolling first reduces aluminum blocks to 2-4mm. Cold rolling thins it further below 0.2mm. Precision sensors control thickness automatically. Twin-rolling produces ultra-thin 0.006mm foil. Final packaging requires dust-free conditions.
Q4: What are extrusion's advantages for shaping aluminum?
Molds cost 60% less than stamping dies. Complex hollow shapes are easily formed. Material waste is under 5%. Production speeds reach 3-10 meters per minute. Surfaces come out smooth, needing no polishing.
Q5: How do aluminum products get different colors?
Anodizing allows dyeing in any Pantone shade. Electrolytic coloring creates gold/bronze tones. Powder coating delivers glossy finishes. Lamination applies wood/stone patterns. Micro-arc oxidation produces ceramic-like black.
