レアアース蛍光体の材料リサイクル技術開発 — レアアース蛍光体の材料リサイクル技術開発 —

大木 達也; 赤井 智子; 山下 勝

doi:10.5571/synth.11.1_33

Research papers

Materials recycling technology for recovering rare earth fluorescent powder from fluorescent lamp sludge

— Pioneering near-future resource circulation —

Tatsuya OKI, Tomoko AKAI, Masaru YAMASHITA

Author information

Keywords: Rare earth, fluorescent powder, high gradient magnetic separation, magnetic matrix, terbium, urban mine

JOURNAL FREE ACCESS

2018 Volume 11 Issue 1 Pages 33-45

DOI https://doi.org/10.5571/synth.11.1_33

Details

Published: 2018 Received: January 08, 2018 Released on J-STAGE: April 26, 2018 Accepted: February 03, 2018 Advance online publication: - Revised: February 02, 2018
Correction information
Date of correction: March 01, 2022 Reason for correction: Correction of errors Correction: Abstract Details: Abstract Wrong: The mammalian clock gene, Period2, was discovered by my research group studying clock genes in 1998. I summarize the progress of understanding the circadian clock molecular mechanism after this discovery. Our group has demonstrated the importance of glycogen synthase kinase 3 – dependent phosphorylation of Period2 and its nuclear transfer and E4BP4 (vrille) negative transcriptional regulation, as well as Clock/Bmal, Period/Cry E-box dependent negative feedback loop. A role of myo-inositol for elongation of the circadian clock was uncovered through collaboration on iceplant projects with Tsujiko Co., Ltd, Shiga prefecture. When we started the molecular study of the circadian clock, we only considered the daily rhythm. Fortuitously, our research on the peripheral clock mechanism (PPARα) revealed a new mechanism of seasonal clocks, which can count photoperiods to adapt to winter (torpor). Our generation of researchers entered Japanese national institutes during a period called “the basic research shift era.” But, basic research grants were cut significantly during the 24 to 25 year period after we joined the institutes, and our research mission was abruptly changed to applied science. After several years of frustration and contemplation, we gave up studies using mice and concentrated on using Drosophila to reduce costs and save time. Consequently, we found a causative role of sleep abnormality around a young age in two neurodegenerative (Gaucher’s and Parkinson’s) diseases by using fly models. I summarize an application for the molecular mechanism of neurodegenerative disease. I am greatly thankful that I was able to spend more than 30 years on the study of molecular circadian clocks with the people who have been involved, from when I started as a researcher in 1986 at the Fermentation Research Institute of the Agency of Industrial Science and Technology to the present day at AIST. Right: A materials recycling technology to recover green phosphor, including terbium, which is a heavy rare earth, from fluorescent powder in waste lamp sludge was realized by collaborating with researchers who specialize in materials and powder sorting. There are few cases worldwide in which materials circulation from post-consumer waste has been established in loops further inside than horizontal recycling. This is a recycling system which is described as an ideal circulation system for the near future in Europe’s circular economy (CE)/resource efficiency (RE) policies, etc. This study is a successful example of Japan leading the world in urban mine development to establish a resource circulation system of various waste products, and becoming a pioneer in near-future resource recycling.

Abstract

A materials recycling technology to recover green phosphor, including terbium, which is a heavy rare earth, from fluorescent powder in waste lamp sludge was realized by collaborating with researchers who specialize in materials and powder sorting. There are few cases worldwide in which materials circulation from post-consumer waste has been established in loops further inside than horizontal recycling. This is a recycling system which is described as an ideal circulation system for the near future in Europe’s circular economy (CE)/resource efficiency (RE) policies, etc. This study is a successful example of Japan leading the world in urban mine development to establish a resource circulation system of various waste products, and becoming a pioneer in near-future resource recycling.

Corresponding author

Correction information

Register with J-STAGE for free!