<報文>レアメタル資源に関する研究(I) : ジルコニウム資源としてのPocos de Caldas, Brasil産カルダサイト

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The zirconium deposit of the Pocos de Caldas Plateau is north of Sa^^〜o Paulo, Brasil, on the boundary between the States of Minas Gerais and Sa^^〜o Paulo. The zirconium ore was formed as a mixture of baddeleyite (ZrO_2) and zircon (ZrSiO_4) which was identified as caldasite from the microscopic, X-ray and electron microprobe studies. This ore also contained a high content of uranium and thorium oxides, enough for nuclear fuel resources from the γ-ray spectrometry. The ore shows stable behavior in the TG-DTA studies but the metamictization by the α radiation damage from uranium and thorium seems to have occurred. The possible production process of zirconium from the caldasite was discussed mainly in the distillation process. Finally the evaluation of the caldasite as a zirconium resource was conducted from the metallurgical point of view.CaldasiteZirconBaddeleyiteZirconiumHafniumUraniumThoriumChlorinationDistillationMetamictizationMetallurgy
東北大学の論文
1986-03-25