<報文>亜鉛溶鉱炉スラグの組織について

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The microstructure of zinc blast furnace (ISF) slag was analyzed by using a microscope and an electron probe micro analyzer (EPMA). When the molten slag was sampled with an iron spoon, the middle part of the sample was cooled slowly, while the edge of the sample was chilled to a glassy state. The microstructure of rapidly cooled ISF slag is illustrated in Photo 1,and the corresponding characteristic X-ray images are given in Photo 2. The following crystallites were recognized, and their compositions are given in Table 2. a) Dendritic wustite. b) Dark grey angular crystallite-hercynite. c) Sulfide particles surrounded by wustite. d) Dark glassy matrix consisting of olivine which decomposes into two kinds of crystallites, (e) and (f) in Table 2,in the slowly cooled slag sample. To clarify the mechanism for the separation of the sulfide particles, melting experiments were carried out for ISF slag and artificial slag with similar composition. As shown in Table 1,the ISF slag used is characterized by large quantities of S, Al_2O_3 and CaO, and a high ratio of FeO/SiO_2. This slag seems to be homogeneous at around 1300℃ in an IS furnace, but during cooling separate to the matte phase containing more than 50 per cent FeO as illustrated in Fig.5 and 6. The matte is surrounded by wustite crystallizing from the matte phase itself, and remains in bulk slag as suspension. The substantial decrease in the valuable metal losses in slag does not seem to be easy under the present operational conditions for ISF, but the decrease in the amount of sulfur in the furnace charge will be important for obtaining good operational results.
東北大学の論文
1980-03-06

<報文>亜鉛溶鉱炉スラグの組織について

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