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2018 Fiscal Year Final Research Report

Development of rare earth element recovery process from apatite ore

Research Project

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Project/Area Number 16K18330
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Earth system and resources engineering
Research InstitutionAkita University

Principal Investigator

Haga Kazutoshi  秋田大学, 国際資源学研究科, 准教授 (10588461)

Research Collaborator Shibayama Atsushi  
Watanabe Yasushi  
Takasaki Yasushi  
Ariuntuya Batsengel  
Amano Koki  
Project Period (FY) 2016-04-01 – 2019-03-31
Keywordsレアアース / リン / アパタイト / 硫酸浸出 / シュウ酸沈殿 / 溶媒抽出 / MAP法
Outline of Final Research Achievements

In order to establish the recovery process of rare earth and phosphorus contained apatite ore, applicant conduct to construct a rare earth elements and phosphorus recovery process combining sulfuric acid leaching, organic acid precipitation, solvent extraction and MAP method. In sulfuric acid leaching, about 91% of the rare earth contained in the apatite ore could be leached by 1 mol / L sulfuric acid. At the same time, it was possible to leach out more than 96% of phosphorus. In order to recover the rare earth elements from the solution obtained from sulfuric acid leaching, oxalic acid precipitation and solvent extraction were investigated. In the oxalic acid precipitation, 85.3% or more of the rare earth could be recovered as rare earth oxide. In addition, phosphoric acid contained in the solution after recovery of rare earth could be recovered by 93% or more by the MAP method.

Free Research Field

資源処理工学、湿式分離工学

Academic Significance and Societal Importance of the Research Achievements

希土類元素(以下、レアアース)は、磁性材料や機能性物質など様々な用途で使用されており、今後も需要の増加が見込まれるが、生産国の偏在性が高いため、汎用的かつ経済的なレアアース回収法を確立する必要がある。本研究では、リンの原料として活用されているアパタイト鉱石に含まれるレアアースに着目し、レアアースとリン酸の回収について調査を行った。その結果、浸出法と沈殿法を組み合わせることでアパタイトからのレアアースおよびリン酸回収が可能であることが見出され、アパタイトがレアアースの新たな供給源となることが期待できる成果が得られた。

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Published: 2020-03-30  

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