溶銑中ボロンの除去および B_2O_3 スラグの水への溶解

概要

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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 Fe_2O_3, CaO, Na_2CO_3, BaO, BaCO_3 and Li_2CO_3 onto the bath. In addition, to recover B_2O_3 from slag and to increase MnO content in slag, the dissolution rate of B_2O_3 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 B_2O_3 from reducing because the reduction rate of B_2O_3 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 B_2O_3 in slag into the distilled water at 100℃ decreased as the increase of content of MnO, FeO and SiO_2 in slag. B_2O_3 in slag dissolved completely into the HCI solutions at 50℃ above 0.25N concentration.
社団法人日本鉄鋼協会の論文
1987-02-01