Distribution of Vanadium between Liquid Iron and MgO-saturated Slags of the System CaO-MgO-FeO_x-SiO₂

Abstract

Experiments have been made to study the vanadium distribution between liquid iron and the CaO-MgO-FeO_x-SiO₂ slag equilibrated in a magnesia crucible in the temperature range from 1 550° to 1 650°C. The vanadium distribution ratios were about an order of magnitude higher and their dependence of slag composition and temperature was found to be smaller compared with the phosphorus distribution ratios. A linear relationship was observed between logarithm of (V) / ([V] [O]ⁿ) (n=2 or 2.5) and CaO/SiO₂ ratio. The V⁴⁺/(V⁴⁺+V⁵⁺) ratio decreased with increasing CaO/SiO₂ ratio, while V³⁺, V⁴⁺ ions were observed in the slag compositions of CaO/SiO₂<1. Phosphorus, silicon, and vanadium distribution ratios between slag and carbon saturated iron melt was obtained at 1 350°C by use of the distribution ratios between slag and liquid iron at a high temperature and interaction parameters.