MMIJ & EARTH 2017, Sapporo

Presentation information (2017/08/24 Ver.)

Special Session

EARTH

Wed. Sep 27, 2017 1:00 PM - 5:00 PM C310 (Fl.3.,Build. C)

Chairman: Kazutoshi Haga (Akita University), Makoto Harita (Harita Metal Co lyd), Apisit Numprasanthai (Chulalongkorn University), Shuji Owada (Waseda University), Dodbiba Gjergj(University of Tokyo)

4:45 PM - 5:00 PM

[2801-14-14] Separation of ceria based abrasive from ceria based glass polishing powder waste by liquid liquid extraction

○Min Yen Li1, Yu Hua Jiang1, Yun Chen Tso1, Yan Jhang Chen1, Li Pang Wang1 (1. National Taipei University of Technology, Taipei, Taiwan, R.O.C.)

Chairman:Dodbiba Gjergj(University of Tokyo), Shuji Owada (Waseda University)

Keywords:liquid liquid extraction, ceria based abrasive, polishing powder, rare earth metals, separation and recycling

In the manufacture process of panel glass, ceria based abrasive is often used in chemical mechanical polishing to remove fine scratches caused by etching treatment. After polishing, a ceria based glass polishing powder waste containing ceria based abrasive and polished glass powder is produced. The waste is discarded into landfill nowadays. In order to promote the recycling of rare earth metal resources, it is necessary to recovery ceria based abrasive from ceria based glass polishing powder waste.
In this research, the separation of ceria based abrasive from ceria based glass polishing powder waste by liquid liquid extraction was studied. Kerosene was used as organic phase. The effects of pH and NaOL addition on the extracted fraction of ceria based abrasive and glass powder, as well as on the mutual separation of the two particles were investigated. Finally, the optimal separation conditions were applied to a ceria based glass polishing powder waste.
The results showed that with the addition of NaOL at pH ranging from 5 to 9, more than 90 % ceria based abrasive can be extracted to the kerosene phase whereas only 10 to 20 % glass powder was extracted. The optimal conditions for the mutual separation of ceria based abrasive and glass powder were obtained when 7.5 kg/ton NaOl was added at pH 7. Under these conditions, the grade and recovery of ceria based abrasive in the kerosene phase solids was 100 % and 98.3 %, respectively. After applying the same conditions to a ceria based glass polishing powder waste, the grade and recovery of that was more than 80 %.

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