TITLE:
Characterization and Iron Removal Treatment of Ion-Adsorption Rare Earth Tailings in Southern China
AUTHORS:
Yongqing Wang, Xin Nie, Qibing Chang, Huayin Liang, Xiaozhen Zhang, Jian-Er Zhou
KEYWORDS:
Tailings, Resource, Rare Earth, Iron Removal, Kaolinite, Magnetic Separation
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.4 No.2,
March
11,
2016
ABSTRACT: The ion-adsorption rare earth tailings have become a serious environmental pollution in Southern
China, yet the potential of their economical value has not been fully exploited. In this work, the
chemical and mineral compositions of the ion-adsorption rare earth tailings were characterized
by Mineral Liberation Analyze (MLA) and XRF. The results show that 91.98 wt% of the tailings are
composed of kaolinite and quartz, latter of which was removed by the sieving method. The other
minor minerals contain feldspar, biotite, muscovite, titanomagnetite and limonite. Amongst these,
the iron-bearing minerals are mostly found in the titanomagnetite and limonite which can be
mostly removed by using a periodic high-gradient magnetic separator with a magnetic induction
of 0.6 Tesla. The Fe2O3 content of the tailings changed from 2.11 wt% to 1.06 wt% after the sorting
process, which met the Chinese national standard of TC-3 grade raw materials for ceramic industry
applications. The Fe2O3 content in kaolinite was further decreased after Na2S2O4 treatment.