クロム鉄鉱中に析出する三二酸化物の挙動に関するX線的研究

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It is well known that sesquioxides, Cr_20_3,Al_20_3 and Fe_20_3,are liberated from chromite ore by heat treatment in air. But behaviors of the sesguioxides in ores fired at temperatures below 1000℃ have not been studied systematically. In this report, influences of behaviors of the sesquioxides on lattice spacing of the chromite fired below 1300℃ and diffusion phenomena of the sesquioxides in the fired chromite grain were examined by X-ray diffraction and fluorescent X-ray analysis. The followings were observed (1) The 1attice spacing (440) of the chromite decreased wjth elevation of heating temperature up to 700°〜900℃ in air and increased over these temperatures. The diffracted line (440) was most broadened at 700°〜900℃. The X-ray pattern of the sesquioxides in α-type appeared over 700℃, and the relative intensity of the diffracted line (014) increased with decrease of its lattice spacing (014) between 700° and 1300℃.(2) By fluorescent X-ray analysis of the chromite grain, ratio of Fe_2O_3/Cr_20_3 on the surface of the grain fired was determined. The ratio increased in the temperature range between 700°and 1100℃, and over this range decreased. So diffusion of the liberated sesguioxides in the spinel phase which presumably consists of a single crystal, was ascertained. It was concluded that by the liberation of the sesquiosides the chromite phase was made unstable at the heating temperature of 700°〜900℃, but was brought into a stable state over 70O°〜900℃ by isolation of two different crystal phases of the sesquioxides and the spinel, with formation of a solid solution of the sesquioxides. The degree of crystallization of the two different phases was raised by heating over 700°〜900℃. The author considers that the behaviors, as described above, of the sesquioxide deposited on the surface of the chromite crysta will give a valuable explanation of reactions with the chromite grain.
社団法人日本セラミックス協会の論文
1963-06-01

クロム鉄鉱中に析出する三二酸化物の挙動に関するX線的研究

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