The use of aluminum is continually increasing in the manufacturing industry. Aluminum has many useful properties for durable products and is used for everything from kitchen utensils and window components to cars and aeroplanes. Every year, our sister company Stena Recycling collects more than 100,000 tonnes of aluminum, which is used for new and more climate-smart premium products - over and over again.
We recycle a large part of all collected aluminum in Älmhult. Aluminum can be recycled over and over again. Aluminum recycling gives an energy saving of 95% compared to the production of virgin aluminum from bauxite.
3 RECEIVING INCOMING MATERIALS
Our production’s raw material consists of 100% recycled aluminum from industrial factory waste and end-of-life products. Stena Aluminum weighs, controls, and classifies incoming materials with a quality assessment based on about forty raw material specifications.
The raw materials are first prepped for optimal handling in the recycling process. We sort, cut, press, and briquette aluminum chips ensuring the raw material is ready for the melting process.
The aluminum raw material is melted in rotating, tiltable melting furnaces. The addition of salt (sodium and potassium chloride) purifies and protects the metal from oxidation. The melt is transferred to alloy furnaces where the aluminum gets its final product properties.
In our alloying furnaces, the molten aluminum is given its specific and final composition. At this point we ensure that the aluminum matches the properties of the finished product according to customer requirements. It is mainly silicon and copper that are added as alloying elements. The melt is purified using nitrogen and chlorine gases. Contaminants and slag are raked out and recycled in the process. The generated flue gas is led to our modern flue gas purification plant.
7 quality control
During the entire process, samples are taken to ensure correct analysis and guarantee the customer's requirements are fulfilled. We carry out material analyses in our laboratory. Together with technical support and training, we are increasing the benefits of using recycled aluminum.
8 CASTING, PACKAGING AND DELIVERY
The finished aluminum products are primarily delivered in the form of ingots but also in liquid form. All our products are produced in accordance with customers’ specific requirements. In this way, the proper use of the right product is ensured when it reaches the manufacturing industry.
9 new products
Now the aluminum has returned to the factory and can become new, climate-smart products in society. Over and over again. A recycled wok can become a component in a car or anything else that is in demand!