@article{fdi:010007692,
  title = {{M}ineralogical and geochemical characteristics of two bauxitic profiles, {F}ria, {G}uinea {R}epublic},
  author = {{B}oulang{\'e}, {B}runo and {B}ouzat, {G}. and {P}ouliquen, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{B}auxite deposits of the {F}ria district, {G}uinea, have been exploited since 1960. {T}hese lateritic bauxites, located on the upper parts of plateaus, result from weathering of paleozoic schists. {T}he ores are composed of gibbsite associated with pyrophyllite, {A}l-substituted goethite, and kaolinite. {P}yrophyllite and {A}l-substituted goethite may contain up to 9% of the total {A}l2{O}3 content of the bauxite ; this cannot be recovered through the {B}ayer process because these phases are insoluble in the leaching solutions. {K}aolinite is soluble under {B}ayer leaching but this dissolution induces precipitation of sodium alumino-silicates, which apart from loss of further alumina results in decreasing efficiency of the process through scale formation. {D}etailed knowledge of the distribution of the different ore types and their mineralogical composition is necessary for efficient processing. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{BAUXITE} ; {PETROGRAPHIE} ; {MINERALOGIE} ; {GEOCHIMIE} ; {TERRES} {RARES} ; {GUINEE} ; {FRIA} {REGION}},
  booktitle = {},
  journal = {{M}ineralium {D}eposita},
  volume = {31},
  numero = {},
  pages = {432--438},
  ISSN = {0026-4598},
  year = {1996},
  DOI = {10.1007/{BF}00189190},
  URL = {https://www.documentation.ird.fr/hor/fdi:010007692},
}