ANALYSIS OF IRON REDUCTION FROM THE LINING AT VACUUM SMELTING OF THE Ni – Cu ALLOYS
https://doi.org/10.17073/0368-0797-2016-12-864-869
Abstract
t. Iron is one of the impurities limited in the Ni – Cu alloys. It may enter into the metal from charge materials and the lining. The content of Fe2O3 in the refractory may reach 2.5 % therefore the estimation of iron concentration growth in the alloys during the interaction of the metal and the lining is the important issue. The aim of this work was to estimate the influence of Fe2O3 content in the crucible material and capacity on the concentration of iron in finished metal. Using the thermodynamic calculations and the experimental data it was determined that nickel and copper may reduce iron from the refractory in the Ni – Cu alloys. Thus, iron turns from the crucible material to the melt almost completely if low-iron charge is used for smelting. The assessment of iron content growth in the Ni – Cu alloys was provided depending on the VIF capacity and Fe2O3 content in periclase crucibles upon condition of the complete transfer of iron into the metal from the lining.
The concentration of reduced iron decreases with the increasing of the furnace capacity, and when the mass of the metal is over 200 kg, the growth of the concentration of iron depends not on the capacity but on Fe2O3 content in the refractory. It was shown that the refractory with Fe2O3 concentration not exceeding 0.5 % is necessary to use for the Ni – Cu alloys production with less 0.01 % of iron. The crucibles with Fe2O3 content not exceeding 2.5 % are recommended for melting of the Ni – Cu alloys with less 0.05 % of iron.
About the Authors
K. O. Titova
National University of Science and Technology “MISIS” (MISIS)
Russian Federation
Engineer
Russian Federation
Engineer
G. I. Kotel’nikov
National University of Science and Technology “MISIS” (MISIS)
Russian Federation
Cand. Sci. (Eng.), Assist. Professor of the Chair of Metallurgy of Steel, New Production Technologies and Metal Protection
Russian Federation
Cand. Sci. (Eng.), Assist. Professor of the Chair of Metallurgy of Steel, New Production Technologies and Metal Protection
K. A. Zubarev
National University of Science and Technology “MISIS” (MISIS)
Russian Federation
Engineer
Russian Federation
Engineer
K. V. Grigorovich
National University of Science and Technology “MISIS” (MISIS)
Russian Federation
Coresponding Member of Russian Academy of Scien ces, Dr. Sci. (Eng.), Professor of the Chair of Metallurgy of Steel, New Production Technologies and Metal Protection, Head of the Laboratory
Russian Federation
Coresponding Member of Russian Academy of Scien ces, Dr. Sci. (Eng.), Professor of the Chair of Metallurgy of Steel, New Production Technologies and Metal Protection, Head of the Laboratory
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Review
For citations:
Titova K.O., Kotel’nikov G.I., Zubarev K.A., Grigorovich K.V. ANALYSIS OF IRON REDUCTION FROM THE LINING AT VACUUM SMELTING OF THE Ni – Cu ALLOYS. Izvestiya. Ferrous Metallurgy. 2016;59(12):864-869. (In Russ.) https://doi.org/10.17073/0368-0797-2016-12-864-869
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