In order to remove B in pig iron as much as possible, the oxidation rates of elements in molten pig iron were measured by adding Fe2O3, CaO, Na2CO3, BaO, BaCO3 and Li2CO3 onto the bath: In addition, to recover B2O3 from slag and to increase MnO content in slag, the dissolution rate of B2O3 in slag into the distilled water or HCI solutions was estimated. The results obtained are as follows;
(1) The removal ratio of B from pig iron was high at lower temperatures without a basic flux. However, a basic flux should be used to prevent B2O3 from reducing because the reduction rate of B2O3 was high at higher temperatures.
(2) The removal ratio of B was high under the same conditions of lower temperature, higher oxidation atmosphere, and higher slag basicity as those of dephosphorization.
(3) The dissolution ratio of B2O3 in slag into the distilled water at 100 °C decreased as the increase of content of MnO, FeO and SiO2 in slag. B2O3 in slag dissolved completely into the HCI solutions at 50 °C above 0.25 N concentration.
