Aluminium Refining Solutions

Rod Feeders

Sistem Teknik’s innovative rod feeder design is registered for a patent application. As we produce rod feeders that are optimal for grain refinement and alloying, we customise our designs according to all specific requirements. We supply grain refiner wire feeding units as single rod feeding or double rod feeding systems according to specific applications. Feeding speed is regulated by the AC Motor driver in the control system. Feed control is done manually from the unit’s own control panel or from the PLC in the casting machine control system.

Degassing Units

We produce degassing units for molten aluminium refining from hydrogen, inclusions and alkalis. Degassers are used in log, coil, strip, rod casting as well as small ingot casting lines. With the special bath design and the use of rotating nozzles, excessive mixing and dross formation are avoided. With shortened degassing periods, metal remains at low levels inside, ensuring efficient processes. 

 

The degassing system works by purging argon through the rotating nozzles for hydrogen removal. An alternative system with chlorine can also be provided to our customers.

 

Sistem Teknik degassers can be easily placed in existing layouts without requiring extra space while the system is available both stationary and tiltable types. Stationary type degassers have rotating system for easy maintenance.

 

Sistem Teknik keeps all spare parts available for degassers in stock.

Features:

  • Capacity: 5-50 tons/hour
  • Heaters: Immersion type, 2 SiC Heater elements in Sialon protective tube
  • Process Gas: Ar, N2 (Optional Cl)
  • Gas Injection: through 2 ea.
  • Graphite rotor (or more)
  • Amount of aluminium remaining in the crucible after casting: 400-1350 kg

Ceramic Foam Filters

Sistem Teknik designs and produces ceramic foam filtering systems (CFF) in order to remove inclusions generated between the degasser and the casting system. CFFs prevent quality issues during  downstream operations. The CFF design is made according to the application as both single chamber and double chamber options exist.

 Features:

  • Model: CFF & TCFF
  • Filter sizes: Standard 7″ – 26″ (30-50 ppi)
  • Capacity: 2-50 tons/hour molten aluminium.
  • Heating: Flat flame burner
  • Heating cover: Pneumatically-tilted

Heated Launder Systems

We produce electric or gas-heated launders to transfer molten aluminium between furnaces and casting machines. In systems requiring low liquid metal transfer rates (continuous casting lines, wire rod casting lines, etc.), electric-heated and insulated covers are used to keep the liquid metal temperatures constant during casting.

The launder system is made of robust steel construction which provides high durability. Multi layers of insulating materials including porous plugs ensure minmal thermal losses to ensure the quality and safety. With the pneumatic actuation system used for covers, launders can be cleaned easily.

Launder sizes vary from 2 to 50 tons/h and can be adjusted according to customer needs.

Porous Plug Systems

Sistem Teknik offers porous plug systems for new furnaces as well as for existing ones to improve the mixing process and the pre-degassing of the aluminium before casting. The system, therefore, improves cost-effectiveness by increasing heat transfer. Inert gases are used to introduce an agitation effect as well as for degassing the melt. Alternatively, reactive gases can improve or even enable refining processes. Through the use of the individual gas flow mechanism, the control of the porous heads can be programmed for different mixing algorithms as well. 

Electromagnetic Stirrers

Electromagnetic stirring and pumping systems for aluminium heat processing play a significant role in improving cost-effectiveness and quality. Electromagnetic stirrers are safe and easy to apply to melting furnaces from the bottom or the side of the furnaces. Under usual circumstances, molten aluminium cannot be continuously mixed since the as the furnace would have to remain open. With the electromagnetic stirring system, continuous stirring is possible as well as homogeneous temperature distribution and more effective aluminium alloying. When the electromagnetic stirring systems are operating, the oxide layer over the molten aluminium is not disturbed. This reduces energy use and dross formation significantly.

Sistem Teknik offers both air and water-cooled electromagnetic stirring solutions by applying them to new plants or existing melting/holding furnaces. It is also possible to use one electromagnetic stirrer for two furnaces if a transfer car is integrated into the casting process.

We also offer electromagnetic pumps for single or multi-chamber furnaces. Electromagnetic pumps (water-cooled) with change wells allow for the recirculation of molten aluminium as well as alloying, thus making it possible to charge small shredded scrap and chips to side well furnaces and multi-chamber furnaces.