DENSITY AND ELECTRIC CONDUCTIVITY OF SOME SYNTHETIC SLAGS FOR STEEL PROCESSING IN LADLE FURNACE

Density ρ and electrical conductivity in some synthetic slag melts intended for refi nement of steel in the unit a ladle-furnace are measured at temperature range of 1430 – 1645 °C. The maximum pressure in a gas (Ar) bubble and the volt-ampere double-electrodes on alternating current with a frequency of 2 kHz and 5 kHz methods were used respectively. The specifi c conductivity æ and also coeffi - cients of volume expansion β, actual molar volumes VM and relative excess molar volumes δVM at 1600 °C were calculated on the basis of the received results. Temperature dependence of æ was approximated by Arrhenius′s equation. The activation energy of conductivity Eæ and preexponentional multiplier æ0 were also calculated. The dependences of the measured characteristics of the slag melts were defi ned from extent of partial replacement N of Al2O3 and SiO2 in slag charge by Na2O. With the growth of N the sizes of ρ, δVM , Eæ and æ0 monotonously decrease, but æ increases; dependence of β from N has more complex character. Dependence β and δVM values from N was discussed from position of the polymeric theory.

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