<報文>鉄シリケートスラグによるクロムの固定に関する基礎的研究(I) : 鉄飽和におけるFeO-Cr_2O_3-SiO_2系の相平衡

概要

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The dissolution behavior of chromium into iron-silicate melt is important in considering metallurgical processes or the disposal of solid waste material. However, little is known about the phase diagram of the iron oxide-chromium oxide-silica system. In this paper, the equilibrium phase relation of the FeO-Cr_2O_3-SiO_2 system when in contact with metallic iron has been clarified at temperatures of 1230 to 1400℃ under a nitrogen atmosphere. Through microscopic and EPMA examinations of samples prepared after melting and quenching in an ice-bath, the following facts have been presented : (l) An isothermal section at 1300℃ is drawn for a region containing the melt. Chromium is found in the melt and wustite or the spinel phase as a solid solution. (2) The temperature dependence of the liquidus surface is confirmed. The homogeneous liquid region becomes greater with increasing temperature, and the solubilities of Cr_2O_3 in iron-silicate melt at 1230,1300 and 1400℃ are 1.5,3 and 5% respectively. On the basis of the above results, the applicability of melting treatment of waste materials and the interaction between fire brick and slag are discussed.
東北大学の論文
1977-09-30