Why do they say that aluminum is infinitely recyclable?
Aluminum is often referred to as infinitely recyclable because it can be recycled repeatedly without any loss of quality or properties. Unlike some other materials that degrade or lose their effectiveness after recycling, aluminum retains its original properties and can be recycled indefinitely.

The reason for aluminum's infinite recyclability lies in its unique chemical and physical properties. When aluminum is recycled, it goes through a process called re-melting. During re-melting, the aluminum is melted down to its liquid state, and impurities and any coatings or paints are removed. The purified aluminum is then solidified and shaped into new products.

Unlike many other materials, the molecular structure of aluminum does not change during this recycling process. This means that each time aluminum is recycled, it remains chemically identical to the original material. As a result, the recycled aluminum is just as strong, durable, and high-quality as the virgin aluminum obtained from raw bauxite ore.

The infinite recyclability of aluminum has significant environmental benefits. Recycling aluminum requires much less energy compared to extracting and processing raw bauxite ore, which is the primary source of aluminum. Recycling also reduces the need for mining and reduces the environmental impact associated with mining activities.

Due to its recyclability and environmental advantages, aluminum is considered one of the most sustainable and eco-friendly materials used in various industries, including packaging, transportation, construction, and consumer goods. It is a shining example of a circular economy, where products are continually reused and recycled to minimize waste and resource consumption.
Why does the molecular structure of other recyclable materials change when melted?  Why does it not for aluminum?