Alkaline leaching of zinc from stainless steel electric arc furnace dusts

• Autorzy: Stefanova A. , Aromaa J. , Forsen O.

Identyfikatory

DOI

10.5277/ppmp150126

• Języki publikacji: EN

Abstrakty

EN

Stainless steel production generates dust and sludge that are considered as a harmful waste. These dusts contain also valuable metals but extraction and recovery of valuables is difficult due their complex composition. Zinc is the most troublesome element in the dust and it hinders direct recycling of dust back into furnaces. In this paper two different stainless steel electric arc furnace dusts (EAF1 and EAF2) from Outokumpu Stainless (Tornio, Finland), were leached using NaOH solutions. The purpose was to selectively leach out zinc from the dusts and to find factors that affected most dissolution of zinc. From all leaching factors temperature, agitation speed and NaOH concentration were found to be statistically strongly significant, whereas a liquid-to-solid ratio and bubbling gas were only somehow significant. Two experiments from the test series gave clearly higher zinc extraction, that is around 60% for EAF1 and 30% for EAF2. For those experiments, a strong 8 M NaOH solution with the high temperature and agitation speed was used but bubbling gas and liquid-to-solid ratio changed. Zinc was leached selectively and practically no iron, chromium and nickel dissolved.

Słowa kluczowe

EN

electric arc furnace dust; EAF; stainless steel; zinc; leaching; sodium hydroxide

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2015
• Tom: Vol. 51, iss. 1
• Strony: 293--302
• Opis fizyczny: Bibliogr. 21 poz., rys., tab.

Twórcy

autor

Stefanova A.

• Aalto University, Department of Materials Science and Engineering, PO Box 16200, FI-00076, Aalto, Finland

autor

Aromaa J.

• Aalto University, Department of Materials Science and Engineering, PO Box 16200, FI-00076, Aalto, Finland

autor

Forsen O.

• Aalto University, Department of Materials Science and Engineering, PO Box 16200, FI-00076, Aalto, Finland

Bibliografia

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