The Submerged Arc Furnace Procedure

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The stainless steel mill dust, scales and other chromium- and nickel-containing production residues are delivered in containers and big bags by barge, rail or truck and fed to an intermediate storage. The storage capacity is designed for the feed of two to three months' production.

In a next step, they are blended with additives and briquetted. These briquettes are transported to a storage area and fed afterwards to the electric arc furnace together with coke and slag formers.

The electric arc furnace is tapped several times per day followed by a gravity separation process to separate the metal phase from the slag. The recovered metal is returned to the customers as large slabs or it is sold on the free market. The slag used in road constructions or as a soil substitute at dumping sites.

The off-gases generated by the process are cleaned in a multi-stage off-gas cleaning system.