| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
Insoluble minerals such as zircon contained in alkaline rocks in the whole world include high heavy rare earth elements (HREE). However, they, generally being a heavy mineral and being resistant to chemical decomposition and erosion, have been not used as HREE resources. In this study, we carried out evaluation of crystallinity by powder X-ray diffraction analysis and HREE leaching experiments by using dilute hydrochloric acid for insoluble minerals like zircon, fergusonite and mosandrite from major HREE deposits. Almost 100 % HREE from the insoluble minerals showing low crystallinity were leached. In this study, we presented characteristics of insoluble minerals suitable for HREE resources by using their simple crystallinity evaluation.
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