RECOVERY OF IRON FROM WASTE SLAG OF COPPER INDUSTRY

The authors discuss the investigation results of phase transformations in the slag of sulphuric cupreous melting during its reduction by the products of gasification of carbon at the temperatures 1100 and 1200 °С. It was experimentally found, that in belllike equipment at the temperature 1100 °С the most part of iron from dump slag of sulphuric melting of the cupreous concentrates may be reduced to metallic state by the products of carbon gasification. Subsequent rise of temperature up to1200 °Cenables to increase iron recovery. During the indirect reduction of the slag at the temperature above temperature of its melting, metallic iron concentrates mostly at the external surface of product of reduction, producing large inclusions, which may be easy extracted by magnetic separation. It’s mostly rational to reduce multilayer blend, consisting from slag layers with the thickness less than5 mmand separating them layers of grinded coal. 

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