Elucidation of Physical Chemistry in Molten Carbonates for Recycling Technology Using Alkaline Pyrometallurgy

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01682
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 26060:Metals production and resources production-related
• Research Institution: Kyoto University
• Principal Investigator: Yasuda Kouji 京都大学, 工学研究科, 特定准教授 (20533665)
• Co-Investigator(Kenkyū-buntansha): 竹田 修 東北大学, 工学研究科, 准教授 (60447141)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 炭酸塩 / 溶融塩 / 物理化学 / 銅 / 鉄 / スズ / コバルト

Outline of Final Research Achievements

The purpose of this study was to elucidate the physicochemical processes of oxidation/reduction and acid/base reactions in carbonate molten salts for the constituent elements of cemented carbide tools and elements to be used as oxidants, and to develop a new recycling process for tungsten. Solubility, diffusion coefficient, and redox potential of metal ions candidate for tungsten reductants were measured, and oxidative dissolution tests of various cemented carbide tool scraps were also conducted.

Free Research Field

金属製錬

Academic Significance and Societal Importance of the Research Achievements

本研究で得られた炭酸溶融塩の物理化学の学術的基礎データをベースとすれば、溶融炭酸塩を用いた手法が高速かつ高分離能のリサイクルプロセスとして発展可能であることが期待される。さらに、物理化学データは、タングステンのリサイクルプロセスだけでなく、燃料電池や分析化学分野への基礎データとしても利用可能であり、学術的な発展へと寄与する。