Process production of copper in a slurry furnace (Outokumpu technology) is based on converting copper matte for a blister, and slag containing even 16% copper oxides. Such slag is tapped into the electric arc furnace in sequence. In this process liquid slag (slurry) is extracted by treatment reducers and technological modifiers. Through the process of refining, the copper content in the tapping slag is at the level approx. 0.4-0.8% Cu. Based on the results it’s seems to be decreased this level, among others through comprehensive technological activities. The refining slag in arc furnace and industrial conditions is staying in static conditions and in strong step of mixing i.e. under electrode zone. The paper discusses the influence of selected technological additives on the reduction of copper oxides in slurry slag, coagulation of products and sedimentation in particular conditions. The tests were carried out under static and dynamic conditions of mixing molten slag at 1300 °C. Differences for the copper forms (like a products of reduction reactions) in the post-deposition slag were demonstrates and occurrence of the coagulation phenomenon.Keywords: Copper metallurgy, reductions of copper oxides, slags
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