Abstract
Knowledge of corrosion processes on the melt – solid boundary is very important for life time of refractories and for refractory using design. The aim of this study was to realize and evaluate laboratory corrosion tests of three types basic refractories used in copper refining. Influence of the melts of CuO-Na2O.2SiO2 on the magnesia, magnesia-chromite and magnesia-carbon refractories was studied by crucible corrosion tests. The samples for the crucible corrosion test were made up from commercially manufactured refractories. The static crucible corrosion tests were carried out in laboratory electric resistive furnace at 1350 °C during 10 hours in air atmosphere. The results of tests were evaluated by macroscopic, microscopic and chemical analysis.
Highlights
1 Introduction Knowledge of corrosion processes on the melt – solid boundary is very important for life time of refractories and for refractory using design
The second zone represents the impregnated layer which is penetrated by the melt CuO-Na2O.2SiO2 and on macrostructure it is characterised by discoloration of the body
5 Conclusion In the presented contribution there is an assessment of the process of the corrosion wear of the basic refractories by the melt of the system CuO-Na2O.2SiO2
Summary
Knowledge of corrosion processes on the melt – solid boundary is very important for life time of refractories and for refractory using design. This paper is aimed to experimental testing of three types basic refractories used in copper refining. Influence of the melts of CuO-Na2O.2SiO2 on the magnesia, magnesia-chromite and magnesia-carbon refractories was studied by crucible corrosion tests. Results were evaluated by macroscopic, micrographic and chemical analyses 1 - 9. The effort of these experiments was to describe interactions ongoing during the contact of basic refractories with the slag melt from the copper refining process. Perhaps the effort was to demonstrate the potential uses of other types of basic refractories for usage in copper metallurgy. Interactions of refractories containing Cr2O3 with the metallurgical melts may produce compounds containing hexavalent chromium, which, according to some literary sources, belongs to carcinogens [13 - 15], or is harmful to health [16-18]
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