Aluminium Melting & Holding Furnaces

Sistem Teknik’s aluminium melting furnaces are some of the most environmentally friendly furnaces in the global market.

Sistem Teknik designs and manufactures single or multi chamber aluminium melting/holding furnaces according to customer demands. The capacity of the furnaces varies from 15 to 150 tons of liquid aluminium with the melting rates up to 20 tons/h while the energy consumption varies between 500 and 700 kW/ton according to the application. These furnaces can be equipped with electromagnetic stirrers, porous plugs, and mechanical or electromagnetic pumps (w/o vortex well). Depending on usage, single chamber aluminium melting/holding furnaces can be manufactured stationary or tiltable. 

 

Manufactured from robust steel construction, these furnaces can operate under heavy foundry conditions, withstanding thermal and mechanical stresses. The furnace door is resistant to all damages, featuring a special sealing clamp system that has been developed as the product of a year-long R&D project. The door opens to the furnace bath completely to provide easy cleaning, charging, and maintenance. 

 

Due to the continuous development of its furnace technology for more than 40 years, Sistem Teknik’s aluminium melting furnaces are some of the most environmentally friendly furnaces in the market. High efficiency regenerative burners can be used for clean scrap while traditional cold air burners can be preferred for dirty scrap. Furthermore, an O2 injection system can be integrated into the heating system to increase the immediate O2 levels after scrap-charging. The furnace atmosphere pressure control system achieves low energy consumption, guaranteeing an environmentally friendly production process as well as low NOx values.

More on Multi-Chamber Technology

Multi-chamber melting furnaces mainly consist of two or three chambers according to the scrap type and the furnace charging method. While contaminated scrap (ingots, T-bars, thick gauge scrap) is melted inside the scrap chamber(s), the melting chamber carries out the process of furnace heating. Molten metal is transferred to the scrap chamber continuously, maintaining temperature homogeneity and finest quality alloying. With the use of a vortex well, the furnace is capable of processing chips and small-sized scrap.

In multi-chamber melting furnaces, scrap is loaded to the bottom-retracted charging machine and put onto the balcony of the scrap chamber. Then the chamber proceeds with pyrolysing in a very low O2 environment for 20 to 25 minutes based on the scrap type and the level of contamination. The pyrolysed gas after the process is collected and transferred to the front of the main burners at the melting chamber to be burned for extra energy. This leads to a green process as well as energy recovery. 

While they are vital to maintain safety in melting operations by eliminating explosion risks, the drying/preheating chambers provide significant energy savings by using waste gases from the melting furnaces. Recirculation fans used in these chambers allow for the material to be heated in only 90 minutes while the material temperature goes up to 150 °C.  While the melting chamber is equipped with high efficiency regenerative burners, a cold air burner is used for the scrap chamber to adjust the O2 level in multi-chamber furnaces.