Title

INDUTEC® EAF DUST RECOVERY SYSTEM FOR A ZERO-WASTE STEEL MELTSHOP

INDUTEC® EAF DUST RECOVERY SYSTEM FOR A ZERO-WASTE STEEL MELTSHOP

Authorship

Zimolo, Dario; Tomadin, Luciano

Zimolo, Dario

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Tomadin, Luciano

I am this author

DOI

10.5151/2594-5300-22804

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Abstract

The quantity of fume abatement dust generated annually with a 1 Mtpy steel meltshop can be up to 25,000 tonnes. EAF dust is classified as a hazardous waste by environmental control agencies. Danieli is committed to build “Zero-Waste” meltshops, thus the recovery of EAF Dust is a priority of the company’s environmental department. The most common process is the Waelz furnace, which recovers a Zinc Oxide rich dust, CZO (Crude Zinc Oxide), but it produces a large quantity of waste, a hazardous material. Danieli proposes a better alternative technology: the Indutec® technology. This new patent process is much more attractive than the Waelz kiln, because, in addition to the production of CZO (Crude Zinc Oxide), it also allows the recovery of pig iron. In addition, the slag from the process is an inert metallurgical slag which can be recovered. When a sufficient quantity of CZO is available, for instance from the Indutec® process applied to the EAF Dust produced with a large meltshop, or with a number of smaller ones, then the further treatment of CZO is economically feasible and the Ezinex®, the technology of second level, is the outstanding hydro-metallurgical process for producing electrolytic Zinc from CZO. Danieli believes that the Indutec® process is an outstanding combination meeting all following goals: Proven process, Economically feasible process, Significant contribution to Zero-Waste electric steelmaking.

The quantity of fume abatement dust generated annually with a 1 Mtpy steel meltshop can be up to 25,000 tonnes. EAF dust is classified as a hazardous waste by environmental control agencies. Danieli is committed to build “Zero-Waste” meltshops, thus the recovery of EAF Dust is a priority of the company’s environmental department. The most common process is the Waelz furnace, which recovers a Zinc Oxide rich dust, CZO (Crude Zinc Oxide), but it produces a large quantity of waste, a hazardous material. Danieli proposes a better alternative technology: the Indutec® technology. This new patent process is much more attractive than the Waelz kiln, because, in addition to the production of CZO (Crude Zinc Oxide), it also allows the recovery of pig iron. In addition, the slag from the process is an inert metallurgical slag which can be recovered. When a sufficient quantity of CZO is available, for instance from the Indutec® process applied to the EAF Dust produced with a large meltshop, or with a number of smaller ones, then the further treatment of CZO is economically feasible and the Ezinex®, the technology of second level, is the outstanding hydro-metallurgical process for producing electrolytic Zinc from CZO. Danieli believes that the Indutec® process is an outstanding combination meeting all following goals: Proven process, Economically feasible process, Significant contribution to Zero-Waste electric steelmaking.

Keywords

Zinc oxide; Dust; Fume treatment plant in steelmaker; Steelmaker dust; Electric arc furnace dust.

Zinc oxide; Dust; Fume treatment plant in steelmaker; Steelmaker dust; Electric arc furnace dust.