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@ARTICLE{Schneider:840621,
      author       = {Schneider, A. and Schmidt, H. and Meven, M. and Brendler,
                      E. and Kirchner, J. and Martin, G. and Bertau, M. and Voigt,
                      W.},
      title        = {{L}ithium extraction from the mineral zinnwaldite: {P}art
                      {I}: {E}ffect of thermal treatment on properties and
                      structure of zinnwaldite},
      journal      = {Minerals engineering},
      volume       = {111},
      issn         = {0892-6875},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-08126},
      pages        = {55 - 67},
      year         = {2017},
      abstract     = {Lithium has become an energy critical element and thus the
                      security of supply is of great importance. As a local German
                      resource, attention was directed towards the mica-type
                      mineral zinnwaldite. It represents a lithium-rich
                      siderophyllite and corresponds to an intermediate
                      polylithionite–siderophyllite solid solution with high
                      contents of fluoride. Mineral samples from the deposit
                      Zinnwald/Cínovec at the German/Czech border were analyzed
                      and characterized by a variety of methods, particularly
                      concerning its thermal behavior. Understanding the thermal
                      behavior of the mica gives the opportunity to develop new
                      and cost-efficient methods for lithium
                      extraction.Investigations with different spectroscopic
                      methods revealed the decomposition mechanisms. Starting at
                      300 °C, oxidation of Fe2+ catalyzed the dehydroxylation of
                      the mica by dehydrogenation. This is followed by a
                      dehydroxylation similar to the mechanism of dioctahedral
                      micas. At higher temperatures, the release of HF was
                      detected. At about 800 °C the precipitation of hematite was
                      observed. The complete decomposition of Zinnwaldite takes
                      place at 900 °C, it is accompanied by the liberation of
                      SiF4 and leads to the formation of several solid
                      decomposition products. By means of single-crystal
                      diffraction using X-rays and neutrons the structural changes
                      could be identified after annealing at 700 °C. The results
                      point to a transformation into a polylithionite-like
                      structure, the end member of the solid solution series.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {620},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-Juel1)HITEC-20170406},
      experiment   = {EXP:(DE-MLZ)HEIDI-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000406729800006},
      doi          = {10.1016/j.mineng.2017.05.006},
      url          = {https://juser.fz-juelich.de/record/840621},
}