Low-emission synthesis of titanium alloys

 

Project description

The DFG research group FOR 1372, comprising the project partners Institute of Mineral and Waste Processing, Waste Disposal and Geomechanics at the University of Technology Clausthal (IFAD) and Institute of Process Metallurgy and Metal Recycling at the University of Aachen (IME), developed a process-step-minimised process for the aluminothermic production of titanium aluminium alloys (ASH- synthesis. The process step minimisation is based on the production and use of high-purity synthetic TiO2 concentrates by reducing ilmenite metal agglomerates with atomic hydrogen using sulphuric acid leaching and hydrolysis under normal p-T-conditions and on the mechanical activation of rutile concentrates. The use of these materials in the aluminothermic production of TiAl-alloys led to a reduced booster material requirement  (-30%) and thus to reduced chlorine emissions. With this result, the first phase DFG research group FOR 1372 has reached their target for the above mentioned project partners.

The target of the 2nd phase is to transfer the developed technology to a commercial scale in the form of a transfer project with partners from the industry. IFAD, in cooperation with the engineering company Siebtechnik GmbH, will strive for an industry-compatible introduction of the mechanical activation through the modification of the used eccentric vibratory mill for the production of mechanically activated rutile ore concentrate. Another aim is to investigate the process step minimised production of synthetic TiO2 from the raw material ilmenite regarding the reaction kinetics and to reach industrial applicability. The industry partner Siebtechnik GmbH shall, in this case, provide support in the solid-liquid separation steps after leaching and hydrolysis through the their centrifuge laboratory. The IME will scale-up the developed process together with the metallurgical company Elektrowerk Weisweiler GmbH. To achieve this, mechanically activated rutile ore concentrate will be used as input material and the thermal balance will be modelled. A parallel research on low potassium booster mixtures by mechanical activation is also planned, which is to be developed jointly by both project partners. Energy balance sheets are to be modelled for the aluminothermic system. The industrial application of the ASH synthesis is to be elevated to a higher technical level by the application of vacuum inert gas technology.

Joint partners

  • Technische Universität Clausthal (TUC), Institut für Aufbereitung, Deponietechnik und Geomechanik (IFAD)
  • Rheinisch-Westfälische Technische Hochschule Aachen (RWTH), Metallurgische Prozesstechnik und Metallrecycling Aachen (IME)
  • Siebtechnik GmbH, Mühlheim an der Ruhr
  • Elektrowerk Weisweiler GmbH, Eschweiler-Weisweiler

Supported by:

Bundesministerium für Bildung und Forschung

Support code: 01DS15022

 

Contacts

Ph. D. Marcela Achimovicova

Tel.: +(49) 5323-72-4933

Prof.-Dr.-Ing. Daniel Goldmann

Tel.: +(49) 5323-72-2735


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