The RecoDust Process—Upscale of a Pilot Plant. Issue 12 (2nd September 2020)

• Record Type: Journal Article
• Authors: Reiter, Wolfgang; Rieger, Johannes; Lasser, Marlene; Raupenstrauch, Harald; Tappeiner, Tamara
• Other Names: Schenk Johannes guestEditor.; Bürgler Thomas guestEditor.
• Is Part Of: Steel research international. Volume 91:Issue 12(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-02
• Subjects: circular economy -- converter dusts -- RecoDust; Steel -- Periodicals; Steel -- Metallurgy -- Periodicals; 669.142
• DOI: 10.1002/srin.202000191
• Languages: English
• ISSNs: 1611-3683

Abstract

Abstract : The RecoDust process is a pyrometallurgical approach for the treatment of heavy metal–containing basic oxygen furnace dusts (BOFD) and delivers two products without any residues: the iron rich RecoDust slag and a zinc rich filter dust, called crude zinc oxide (CZO). The state of the art Waelz process has some disadvantages and is only suitable for dusts with zinc contents >15%. Within the frame of a project of the Austrian competence center program K1‐MET and with financial support of voestalpine Stahl, a RecoDust pilot plant is operated at the Chair of Thermal Processing technology at the Montanuniversitaet Leoben and has shown good dezincification rates of BOFD in eleven smelting campaigns with a throughput up to 300 kg h −1 . The target is the design of an industrial plant with a throughput capacity of 1000 kg h −1 in the next years. For the upscale, a new pneumatic conveying system was installed at the pilot plant, which uses natural gas as conveying medium. The commissioning of the developed pilot plant was successful and revealed a good product quality of the CZO. An enhanced dezincification of the RecoDust slag is one open challenge, therefore the dust feed conveying must be more precise. Abstract : The RecoDust process is a pyrometallurgical approach for the treatment of heavy metal–containing basic oxygen furnace dusts. After several test trials with the pilot plant, the current research work is focused on the upscale of the RecoDust process. Therefore, a new pneumatic conveying machine with natural gas as conveying gas has been installed and commissioned.