熔融状態に於ける酸性及び鹽基性平爐鋼滓の粘性に就て

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概要

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• The author studied on the viscsosity of slag from an acid and basic open hearth furnace in molten state, with a measuring apparatus for viscosity based on a rotating cylinder method. In this experiment, as any refractory material is attacked by molten slag from a steel furnace, especially by basic slag he used a rotating cylinder covered with platinum and a Platinum crucible, and measured the temperature up to 1, 600℃, steeping a Pt-Pt・Rh thermo couple directly in the slag. Unlike iron, the change of the viscosity of steel furnace slag highly depends on temperature, and the slag does not present the distinct temperature of primary crystalization, acid open hearth furnace slag is far more viscous than basic one. When the amount of FeO increases in acid open hearth furnace slag, its melting temperature becomes low, and its viscosity weak ; whill, MnO malses the melting temperature of the slag high and the viscosity weak. The melting temperature of fayalite (FeO・SiO_2) obtained by viscosity curve is 1, 360℃, that of Rhodonite (MnO・SiO_2) is 1, 255℃, and that of tephroite (2MnO・SiO_2) is about 1, 270℃, They are all weak in viscosity, and their change in viscosity influenced by temperature is comparatively small. As for viscosity cuwe, in rhodonite it is rather inclined., but in the rest it is nearly horizontal. Making the sum of FeO and MnO about 24%, and CaO, MgO, SiO_2 and Al_2O_3 constant, the author measurtd the viscosity of artificsal steel furnace slag, in which FeO and MnO were reflaced each other. The slag rich in FeO is weak in viscosity and low in melting temperature, but the more there is MnO in the slag, the stronger its viscosity and the higher its melting temperature, Different views have been held as to the action of fluorspar in the open hearth slag, The present author ascertained the relation between the viscosity of molten slag and the amount of fluorine in it. 0.1-0.4%F was found in 10 basic open hearth slags. The amount of spar added to the slag is 0.3-5% of the latter and 15-16% CaF_2 of the spar is present in the slag. Spar makes the viscosity of basic open hearth slag weak, and the melting temperature remarkably low. 1%F makes the melting temperature low about 100℃ Examining the analytical results of slags which were added with spar, the losses of F and Si correspand to the ratio SiF_4. Six artificial slag were prepared maintaining the sum of CaO, MgO and MnO about 61%, other constituents constant, and replaceng MnO by MgO and CaO from 0.32 to 13.64%, and there viscosity was measured. MnO makes viscosity weak and melting temperature low. if 1% of CaO+MgO is replared by MnO, the melting temperature of the slag decrease about 12℃, Further, making the sum of CaO and MgO aboat 36% and MnO, FeO and Al_2O_3 constant, the autnor measured the viscosity of these 5 artificeal slags, in which CaO and MgO were replaced each other The slag rich in MgO is weak a little in viscogity, and remarkably high in melting temperature. If 12 of CaO is replaced by MgO, the melting temperature of the slag decreases ab. ut 14℃.

• 社団法人日本鉄鋼協会の論文
• 1933-12-25

著者

• 松川 達夫

  大阪帝國大學

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