Solvent extraction of aqua PGM and construction of basic process for PGM recycling

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05401
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 31020:Earth resource engineering, Energy sciences-related
• Research Institution: Yamaguchi University
• Principal Investigator: Niinae Masakazu 山口大学, 大学院創成科学研究科, 教授 (50228128)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 資源循環 / 溶媒抽出 / 白金族金属 / ロジウム / ルテニウム / 第一スズ / 塩化物水溶液

Outline of Final Research Achievements

The extraction and separation of rhodium and ruthenium from hydrochloric acid solutions and hydrochloric acid solutions added tin(II) with four types of extractants ranging from primary to quaternary ammonium salt was investigated. As the result of this study, it was found that rhodium can be separated from ruthenium by preferential extraction of rhodium from hydrochloric acid solutions added tin(II) with benzene-diluted tri-n-octylamine (TOA) or trioctylmethylammonium chloride (TOMAC). It was also found that solid-liquid separation of tin as hydroxides and ruthenium as nitrite complex ions can be achieved by stripping with basic sodium nitrite solutions. And also, it was found that ruthenium can be easily extracted without adding tin(II) with 2-ethylhexylylamine (EHA), and ruthenium can be easily stripped from organic phase with aqueous sodium sulfate solutions.

Free Research Field

循環環境工学

Academic Significance and Societal Importance of the Research Achievements

ロジウム及びルテニウムの需要の増大、また、地域偏在性、資源ナショナリズムの高揚、地域紛争などによる安定供給に不安がある中、本研究では溶媒抽出法によるロジウムとルテニウムの分離回収に成功しており、持続可能な白金族金属の資源循環を実現するための基盤となる研究であり、学術的にも社会的にも意義の高い研究である。