Method for processing slags of non-ferrous metallurgy

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United States of America Patent

PATENT NO 9435005
APP PUB NO 20150122082A1
SERIAL NO

14394697

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A method for processing slags containing iron and non-ferrous metals, to produce clean slag free of detrimental substances and non-ferrous metals and suitable for use as a raw material or construction material. Slag is reduced in a reduction furnace with the help of reducing agents so that at least 5% of the iron of the slag is reduced into metal. Some of the non-ferrous metals, such as zinc, lead, arsenic and cadmium, vaporize. The contents of the reduction furnace are continuously mixed to prevent separation of a metallic phase from the slag. The generated slag-metal mixture is tapped off from the reduction furnace, cooled, crushed and ground to a finer size. Finally, a metal fraction is separated from a clean slag.

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Patent Owner(s)

  • OUTOTEC (FINLAND) OY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kurki, Pekka Harjunpaa, FI 1 2
Liipo, Jussi Ulvila, FI 3 5
Metsarinta, Maija-Leena Vanha-Ulvila, FI 7 10
Scheidema, Madeleine Pori, FI 2 2

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