Aluminium

Aluminium is often called the green metal, thanks to properties that support sustainable product development and enable recycling and remelting. Aluminium is light and strong, is easy to shape and process, is corrosionresistant, and has good heat transfer properties.

Recycled aluminium

The extraction of bauxite and production of primary aluminium are energy-intensive processes. It is possible, however, to recycle aluminium without any appreciable impact on quality. Gränges therefore strives to maximize the use of recycled aluminium as recycling is more cost efficient as well as more advantageous from a sustainability perspective.

Continuous improvement

Gränges works continuously to optimise processes to increase aluminium yield. A certain amount of process scrap cannot be avoided in the production process. To ensure that the process is as cost effective as possible, internal scrap is reinserted into the process through remelting.

If internal scrap of the right quality is unavailable, external scrap (recycled aluminium) is purchased, mainly from aluminium scrap dealers but also from customers. The advantage of buying scrap from Gränges’ own customers is that the composition is known, and it is therefore easier to remelt the scrap. If external scrap of sufficient quality is unavailable on the market, primary aluminium is used.

Alloys of the future

Recycling possibilities are increasingly important when developing new products and alloys. Research and development work is focused on identifying integrated solutions that not only achieve the required technical specification, but also enables improved recycling rates.

To ensure the suitable material properties Gränges clads different alloys onto the aluminium alloy cores. The claddings change the composition which affects the recycling potential. Gränges runs a research program to obtain so called “sustainable alloys”. These alloys are designed towards optimal combinations of application requirements and recyclability.

Percentage of materials used that are
recycled input materials

% 2016 2015 2014
Gränges
Finspång

18.3

22.7

17.3
Gränges
Shanghai

5.5

5.6

5.5