Method for processing slags of non-ferrous metallurgy

A method for processing slag containing iron and non-ferrous metals, the method comprising the steps of:

• feeding the slag into a reduction furnace;
• reducing the slag in the reduction furnace by means of a reducing agent to convert at least some of the non-ferrous metals to metallic form, where reduction occurs at least until 5 mass-% of the iron has reduced into metal and at least some of the non-ferrous metals has vaporized;
• mixing the contents of the reduction furnace during reduction to prevent settling of metal droplets from the slag;
• tapping a molten slag-metal mixture generated in the reduction furnace;
• cooling, crushing and grinding the slag-metal mixture;
• processing the slag-metal mixture to separate a metal fraction from a remaining clean slag, where the remaining clean slag is suitable as raw material in a useful process.