Large-scale project “voestalpine Blast Furnace Service 2018” is complete

IFE feeders and screens also fit for the next blast furnace voyage

Author: Werner Lienbacher, responsible for Project Engineering and Sales at IFE Aufbereitungstechnik GmbH at the Waidhofen / Ybbs location in Austria

Background
Thanks to the outstanding quality of its products and system solutions made from steel and other metals, the voestalpine Group is counted among the leading partners of the European automobile and household appliance industry and a world leader in the aerospace, oil and gas industries.
Two-thirds of the total quantity of raw iron required for steel production at the location in Linz, Austria is produced in blast furnace A. The renovation of the unit, required at regular intervals every 14 years, was scheduled for 2018 and successfully completed at the end of September. At the same time, all other operating facilities associated with the blast furnace had their technology updated.1)
 
IFE vibrating feeders
This meant that 39 feeders for blast furnace burdening delivered by IFE to voestalpine were checked. Some of the feeders have been in use since the 1970s and are at around 250,000 operating  hours. They are used for the removal of ore, coke, sinter and various additives from day and weighing hoppers.
 
Photo: Wakolbinger
IFE day hopper discharge feeder
 
In general, feeders are not the main focus of a plant. However, if they are not properly designed, they can have a negative impact on both system throughput as well as product Quality.2) That is why IFE vibrating feeders are always designed and fabricated with the specific application in mind. A wide variety of design options are available, based on customer requirements. In the case mentioned above, wear protection made from ceramics or connected armor plates are being used. Thanks to the robust design, maintenance costs are very low, ensuring a very high level of operational security. Furthermore, the drive and feeder of the magnet conveyors are fabricated in-house, which guarantees excellent availability of replacement parts.
 
Photo: Wakolbinger
IFE weighing hopper discharge feeder
 
IFE TRISOMAT flip-flop screen
Two IFE TRISOMAT flip-flop screens, which each sieve approximately 1200 t of ore per day at 6 mm in normal operation, were also impacted by the service. The ore, which available in the required quantity at this point, is placed onto the burden belt going toward the blast furnace, while the non-usable fines are directed elsewhere and processed for another purpose.
 
Photo: Wakolbinger
IFE-flip flop screen TRISOMAT
 
Screens in this series are an optimal solution for extremely difficult screening materials, for example wet or dusty iron ore. Wherever there are deposits that clog or jam conventional screening machines, these screens provide outstanding results at high feed rates, even with small mesh openings.
Screen crossbeams are fitted onto two moving frames. Flexible screen panels fitted onto these panels are mechanically tightened and loosened in alternating fashion. Maximum acceleration forces prevent the screen lining from becoming blocked up or sticking, resulting in the material being intensively blended.
The material that sticks to the mesh is ejected by over-stretching the screen lining during tensioning.3)
The “self-cleaning effect” achieved this way enables high availability, since stoppages for cleaning are reduced to a minimum.
 
voestalpine, which invests exclusively in technologies that are reliable and of the highest quality – from the vehicle fleet used for material transport to the machines used for processing – greatly values its partnership with IFE Aufbereitungstechnik GmbH, which has been going strong for nearly 40 years. 
 
 
 
 
1 Comp. industriemagazin.at/voestalpine-generalsanierung
2 Comp. Schüttgut Vol. 13 (2007) No. 7
3 Comp. Lehrgang Rohstoffaufbereitung Montanuniversität Leoben
 

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